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EX-99.1

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EX-99.1

Document

FOR IMMEDIATE RELEASE

Limbach Holdings, Inc. Reports First Quarter 2026 Results

Reaffirms Full Year 2026 Revenue Guidance of $730 million to $760 million and Adjusted EBITDA of $90 million to $94 million

TAMPA, Fla. – May 5, 2026 – Limbach Holdings, Inc. (Nasdaq: LMB) (“Limbach” or the “Company”), a building systems solutions firm that partners with building owners and operators who have mission-critical mechanical, electrical, plumbing, and controls, or MEPC, systems today announced its financial results for the quarter ended March 31, 2026.

First Quarter 2026 Highlights Compared to First Quarter 2025

•Total revenue increased 4.3% to $138.9 million from $133.1 million

•Owner Direct Relationships (“ODR”) revenue increased 10.4%, or $9.4 million, to $99.8 million, or 71.9% of total revenue

•Total sales booked during the quarter were $209.1 million, generating a book-to-bill ratio of 1.5x

•Net income of $4.4 million, or $0.36 per diluted share, compared to $10.2 million, or $0.85 per diluted share

•Adjusted net income of $7.8 million, or $0.64 per adjusted diluted earnings per share, compared to adjusted net income of $13.5 million, or $1.12 per adjusted diluted earnings per share

•Adjusted EBITDA of $8.7 million, compared to $14.9 million

•Total gross profit of $31.2 million, compared to $36.7 million

•Net cash used in operating activities of $7.8 million compared to net cash provided by operating activities of $2.2 million

Management Comments

“We delivered solid first quarter results in line with our expectations and generated an exceptionally strong level of bookings that we view as the clearest indicator of strengthening demand across our end markets. This momentum positions Limbach for accelerating organic revenue growth as orders convert to sales,” said Mike McCann, President and Chief Executive Officer of Limbach. “The Company’s $209.1 million of bookings and 1.5x book to bill ratio reflect meaningful demand strength across mission critical end markets and provide strong visibility into future revenue conversion. Over the past two quarters, we generated more than $434 million of bookings, reinforcing our confidence in our revenue guidance for 2026. We also see strong momentum in the data center vertical, which represented approximately 27% of bookings in the quarter. Limbach has longstanding relationships with mission-critical and hyperscale customers, and we are building on that foundation as demand in this market continues to accelerate, driving increased participation and meaningful contributions to our overall growth.

“Margins were impacted this quarter by lower fixed cost absorption, the absence of higher net project write-ups that benefited the prior-year period, and near-term mix impact from Pioneer Power, which carries a lower margin profile today. However, we have already implemented targeted pricing, operational, integration, and sales initiatives that we expect will drive margin improvement as we progress through 2026.

“With a strong balance sheet, a durable business model, and continued investment in our national sales organization and mission critical end markets, we believe we are well positioned to execute our growth strategy. Our strategic priorities for the year are focused on driving ODR organic revenue growth, expanding margins through higher-value customer solutions, and disciplined capital allocation as we scale the business through acquisitions. We believe this positions Limbach to become a leading building solutions partner for owners of mission critical facilities and to deliver attractive long-term value for our stockholders.”

The following are results for the three months ending March 31, 2026, compared to the three months ending March 31, 2025:

•Total revenue increased 4.3%, or $5.8 million, to $138.9 million from $133.1 million. The increase in revenue was primarily attributable to Pioneer Power, which was acquired in July 2025, and contributed a full quarter of revenue in the current period with no comparable contribution in the prior-year period. Of the total increase in revenue, acquisition-related revenue represented

17.7%, or $23.5 million, which was partially offset by a decrease in organic revenue of 13.4%, or $17.8 million. The decline in organic revenue reflects the impact of lower bookings in the middle of 2025 and normal seasonal patterns among industrial customers. More recent booking activity has strengthened significantly, which the Company expects will drive revenue growth as the year progresses.

◦ODR segment revenue increased 10.4%, or $9.4 million, to $99.8 million. Acquisition-related revenue increased 15.8%, or $14.3 million, partially offset by a 5.4%, or $4.9 million decrease in organic revenue.

◦General Contractor Relationships (“GCR”) segment revenue decreased 8.6%, or $3.7 million, to $39.0 million. Organic revenue decreased 30.2%, or $12.9 million, partially offset by a 21.6%, or

lmb-20260302false000160616300016061632026-03-022026-03-02

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 2, 2026

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On March 2, 2026, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its year ended December 31, 2025. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the fourth quarter 2025 and year ended December 31, 2025

99.2 Investor Presentation

104Cover Page Interactive Data File (the

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): November 4, 2025

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On November 4, 2025, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended September 30, 2025. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended September 30, 2025

99.2 Investor Presentation

104Cover Page Interactive Data File (the cover page

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): August 5, 2025

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On August 5, 2025, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended June 30, 2025. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended June 30, 2025

99.2 Investor Presentation

104Cover Page Interactive Data File (the cover page XBRL tags are

lmb-20250505false000160616300016061632025-05-052025-05-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): May 5, 2025

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On May 5, 2025, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended March 31, 2025. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended March 31, 2025

99.2 Investor Presentation

104Cover Page Interactive Data File (the cover page XBRL tags are embe

lmb-20250310false000160616300016061632025-03-102025-03-10

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 10, 2025

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On March 10, 2025, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its year ended December 31, 2024. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the fourth quarter 2024 and year ended December 31, 2024

99.2 Investor Presentation

104Cover Page Interactive Data File (th

lmb-20241105false000160616300016061632024-11-052024-11-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): November 5, 2024

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On November 5, 2024, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended September 30, 2024. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended September 30, 2024

99.2 Investor Presentation

104Cover Page Interactive Data File (the cover page

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): August 6, 2024

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On August 6, 2024, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended June 30, 2024. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended June 30, 2024

99.2 Investor Presentation

104Cover Page Interactive Data File (the cover page XBRL tags are

lmb-20240508false000160616300016061632024-05-082024-05-08

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): May 8, 2024

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On May 8, 2024, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended March 31, 2024. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as of the date of this report. While the Company may elect to update the Investor Presentation in the future to reflect events and circumstances occurring or existing after the date of this report, the Company specifically disclaims any obligation to do so. By furnishing the portions of this Current Report on Form 8-K that are disclosed under this Item 7.01 and the Investor Presentation that is an exhibit hereto, the Company makes no admission as to the materiality of any information included under this Item 7.01, including without limitation the Investor Presentation. The Investor Presentation contains forward-looking statements. See Page 2 of the Investor Presentation for a discussion of certain forward-looking statements that are included therein and the risks and uncertainties related thereto. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.2 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended March 31, 2024

99.2 Investor Presentation

104Cover Page Interactive Data File (the cover page XBRL tags are embe

lmb-20240313false000160616300016061632024-03-132024-03-13

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 13, 2024

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 1.01Entry into a Material Definitive Agreement.

On March 13, 2024, Limbach Facility Services LLC, Limbach Holdings LLC and other designated loan parties entered into a first amendment to the second amended and restated Wintrust credit agreement (the “First Amendment to the Second A&R Wintrust Credit Agreement”) with the lenders party thereto and Wheaton Bank & Trust Company, N.A., a subsidiary of Wintrust Financial Corporation (collectively, “Wintrust”), as administrative agent. The First Amendment to the Second A&R Wintrust Credit Agreement makes certain amendments to the Second A&R Wintrust Credit Agreement, including: (i) modifying the definition of “L/C Sublimit” to increase the sublimit for the issuance of letters of credit from $5.0 million to $10.0 million, (ii) removing the requirement to deliver a Borrowing Base Certificate if outstanding Revolving Loans and Letters of Credit (as such terms are defined in the Second A&R Wintrust Credit Agreement) do not exceed $30.0 million, and (iii) removing certain financial covenants that restrict the Company’s ability to make Unfinanced Capital Expenditures (as defined in the Second A&R Wintrust Credit Agreement). The foregoing description of the First Amendment to the Second A&R Wintrust Credit Agreement is a summary only and is qualified in its entirety by reference to the First Amendment to the Second A&R Wintrust Credit Agreement, a copy of which is attached as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 2.02Results of Operations and Financial Condition.

On March 13, 2024, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its year ended December 31, 2023. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

The Company is furnishing presentation materials (the “Investor Presentation”) that management intends to use, possibly with modifications, in one or more meetings from time to time with current and potential investors. The Investor Presentation includes an update on the Company’s current operations and major projects, as well as information relating to the Company’s strategic plans, goals, growth initiatives and outlook, and forecasts for future performance and industry development. The foregoing description of the Investor Presentation does not purport to be complete and is qualified in its entirety by reference to the complete text of the Investor Presentation attached as Exhibit 99.2 to this Current Report on Form 8-K. The information contained in the Investor Presentation is summary information that should be considered in the context of the Company’s filings with the Securities and Exchange Commission and other public announcements the Company may make by press release or otherwise from time to time. The Investor Presentation speaks as

lmb-20231108false000160616300016061632023-11-082023-11-08

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): November 8, 2023

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On November 8, 2023, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended September 30, 2023. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended September 30, 2023

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Executive Vice President and Chief Financial Officer

Dated: November 8, 2023

lmb-20230809false000160616300016061632023-08-092023-08-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): August 9, 2023

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On August 9, 2023, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended June 30, 2023. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended June 30, 2023

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Executive Vice President and Chief Financial Officer

Dated: August 9, 2023

lmb-20230508false000160616300016061632023-05-082023-05-08

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): May 8, 2023

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On May 8, 2023, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended March 31, 2023. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended March 31, 2023

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Executive Vice President and Chief Financial Officer

Dated: May 8, 2023

lmb-20230308false000160616300016061632023-03-082023-03-08

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 8, 2023

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On March 8, 2023, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its year ended December 31, 2022. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the fourth quarter 2022 and year ended December 31, 2022

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Executive Vice President and Chief Financial Officer

Dated: March 8, 2023

lmb-20221109false000160616300016061632022-11-092022-11-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): November 9, 2022

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On November 9, 2022, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended September 30, 2022. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended September 30, 2022

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Chief Financial Officer

Dated: November 9, 2022

lmb-20220809false000160616300016061632022-08-092022-08-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): August 9, 2022

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100 Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On August 9, 2022, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended June 30, 2022. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended June 30, 2022

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Chief Financial Officer

Dated: August 9, 2022

lmb-20220505false000160616300016061632022-05-052022-05-050001606163dei:FormerAddressMember2022-05-052022-05-05

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): May 5, 2022

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

797 Commonwealth Drive, Warrendale, Pennsylvania 15086 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

1251 Waterfront Place, Suite 201, Pittsburgh, Pennsylvania 15222 (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 1.01Entry into a Material Definitive Agreement.

On May 5, 2022, Limbach Facility Services LLC (the “Borrower”), Limbach Holdings LLC (the “Intermediate Holdco”) and other designated loan parties entered into a first amendment and waiver to the amended and restated Wintrust credit agreement (the “First Amendment to the A&R Wintrust Credit Agreement”) with the lenders party thereto and Wheaton Bank & Trust Company, N.A., a subsidiary of Wintrust Financial Corporation (collectively, “Wintrust”), as administrative agent. The First Amendment to the A&R Wintrust Credit Agreement modifies certain definitions within the A&R Wintrust Credit Agreement, and make other corresponding changes, including: (i) the definition of EBITDA to allow for the recognition of certain restructuring charges and lease breakage costs not previously specified, (ii) the definition of Excess Cash Flow to exclude the aggregate amount of the Earnout Payments paid in cash, (iii) the definition of Total Funded Debt to exclude certain capitalized lease obligations for real estate based on the approval of each lender and (iv) the definition of Disposition to include a clause for the sale and leaseback of certain real property based on the approval of each lender. The foregoing description of the First Amendment to the A&R Wintrust Credit Agreement is a summary only and is qualified in its entirety by reference to the First Amendment to the A&R Wintrust Credit Agreement, a copy of which is attached as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 2.02Results of Operations and Financial Condition.

On May 10, 2022, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended March 31, 2022. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 10.1 First Amendment and Waiver to the Amended and Restated Credit Agreement, dated as of May 5, 2022, by and among Limbach Facility Services LLC, Limbach Holdings LLC, the other Loan Parties party thereto, the Lenders party thereto and Wheaton Bank & Trust Company, N.A., as Administrativ

lmb-20220316false000160616300016061632022-03-162022-03-16

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): March 16, 2022

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

1251 Waterfront Place, Suite 201, Pittsburgh, Pennsylvania 15222 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On March 16, 2022, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its year ended December 31, 2021. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the fourth quarter 2021 and year ended December 31, 2021

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Chief Financial Officer

Dated: March 16, 2022

lmb-20211110false000160616300016061632021-11-102021-11-10

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): November 10, 2021

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

1251 Waterfront Place, Suite 201, Pittsburgh, Pennsylvania 15222 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On November 10, 2021, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended September 30, 2021. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended September 30, 2021

104Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Chief Financial Officer

Dated: November 10, 2021

8-K 1 form8-k1q10q8x12x2021.htm 8-K

Document

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): August 12, 2021

LIMBACH HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

Delaware001-3654146-5399422 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

1251 Waterfront Place, Suite 201, Pittsburgh, Pennsylvania 15222 (Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (412) 359-2100

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common stock, $0.0001 par valueLMBThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Item 2.02Results of Operations and Financial Condition.

On August 12, 2021, Limbach Holdings, Inc. (the “Company”) issued a press release dated the same date announcing its financial results for its quarter ended June 30, 2021. We have furnished a copy of this release as Exhibit 99.1 to this Current Report on Form 8-K.

Item 7.01Regulation FD Disclosure.

Exhibit 99.1 hereto is incorporated into this Item 7.01 by reference. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1 Earnings Press Release for the quarter ended June 30, 2021

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LIMBACH HOLDINGS, INC.

By: /s/ Jayme L. Brooks Name: Jayme L. Brooks Title: Chief Financial Officer

Dated: August 12, 2021