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Reference ID: 0.c706d217.1784986892.44f3a606

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For best practices on efficiently downloading information from SEC.gov, including the latest EDGAR filings, visit sec.gov/developer. You can also sign up for email updates on the SEC open data program, including best practices that make it more efficient to download data, and SEC.gov enhancements that may impact scripted downloading processes. For more information, contact opendata@sec.gov.

For more information, please see the SEC’s Web Site Privacy and Security Policy. Thank you for your interest in the U.S. Securities and Exchange Commission.

Reference ID: 0.c706d217.1784464181.eb36955a

More Information

Internet Security Policy

By using this site, you are agreeing to security monitoring and auditing. For security purposes, and to ensure that the public service remains available to users, this government computer system employs programs to monitor network traffic to identify unauthorized attempts to upload or change information or to otherwise cause damage, including attempts to deny service to users.

Unauthorized attempts to upload information and/or change information on any portion of this site are strictly prohibited and are subject to prosecution under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act of 1996 (see Title 18 U.S.C. §§ 1001 and 1030).

To ensure our website performs well for all users, the SEC monitors the frequency of requests for SEC.gov content to ensure automated searches do not impact the ability of others to access SEC.gov content. We reserve the right to block IP addresses that submit excessive requests. Current guidelines limit users to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests.

If a user or application submits more than 10 requests per second, further requests from the IP address(es) may be limited for a brief period. Once the rate of requests has dropped below the threshold for 10 minutes, the user may resume accessing content on SEC.gov. This SEC practice is designed to limit excessive automated searches on SEC.gov and is not intended or expected to impact individuals browsing the SEC.gov website.

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Note: We do not offer technical support for developing or debugging scripted downloading processes.

source-20260122false000003478200000347822026-01-222026-01-22

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): January 22, 2026

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On January 22, 2026, 1st Source Corporation issued a press release that announced its fourth quarter earnings for 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated January 22, 2026, with respect to 1st Source Corporation’s financial results for the fourth quarter ended December 31, 2025.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: January 22, 2026/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20251023false000003478200000347822025-10-232025-10-23

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): October 23, 2025

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On October 23, 2025, 1st Source Corporation issued a press release that announced its third quarter earnings for 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated October 23, 2025, with respect to 1st Source Corporation’s financial results for the third quarter ended September 30, 2025.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: October 23, 2025 /s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20250724false000003478200000347822025-07-242025-07-24

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): July 24, 2025

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On July 24, 2025, 1st Source Corporation issued a press release that announced its second quarter earnings for 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated July 24, 2025, with respect to 1st Source Corporation’s financial results for the second quarter ended June 30, 2025.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: July 24, 2025 /s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20250424false000003478200000347822025-04-242025-04-24

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): April 24, 2025

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On April 24, 2025, 1st Source Corporation issued a press release that announced its first quarter earnings for 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated April 24, 2025, with respect to 1st Source Corporation’s financial results for the first quarter ended March 31, 2025.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: April 24, 2025 /s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20250123false000003478200000347822025-01-232025-01-23

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): January 23, 2025

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On January 23, 2025, 1st Source Corporation issued a press release that announced its fourth quarter earnings for 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated January 23, 2025, with respect to 1st Source Corporation’s financial results for the fourth quarter ended December 31, 2024.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: January 23, 2025/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20241024false000003478200000347822024-10-242024-10-24

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): October 24, 2024

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On October 24, 2024, 1st Source Corporation issued a press release that announced its third quarter earnings for 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 8.01    Other Events.

The Executive Compensation and Human Resources Committee of the Board of Directors took action on October 23, 2024, to further define the normal retirement age of Participants in the Plan. Specifically, the Committee amended the 1982 Executive Incentive Plan effective October 23, 2024, to stipulate that the normal retirement age is 65 and that a Participant who is 60 or older will be treated as having attained the normal retirement age if they have completed either 15 years in the Plan or 20 years of service with the Corporation so long as notice of retirement is given 150 days beforehand. Additionally, the method of calculating interest paid on the purchase price was adjusted from the Bank’s one-year certificate of deposit rate to a calculation of dividends for the most recently completed calendar year divided by the ending market value of common stock for the most recently completed calendar year. Interest is adjusted annually on the anniversary date of the note documenting the sale agreement.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated October 24, 2024, with respect to 1st Source Corporation’s financial results for the third quarter ended September 30, 2024.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: October 24, 2024 /s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20240725false000003478200000347822024-07-252024-07-25

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): July 25, 2024

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On July 25, 2024, 1st Source Corporation issued a press release that announced its second quarter earnings for 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated July 25, 2024, with respect to 1st Source Corporation’s financial results for the second quarter ended June 30, 2024.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: July 25, 2024/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20240425false000003478200000347822024-04-252024-04-25

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): April 25, 2024

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On April 25, 2024, 1st Source Corporation issued a press release that announced its first quarter earnings for 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated April 25, 2024, with respect to 1st Source Corporation’s financial results for the first quarter ended March 31, 2024.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: April 25, 2024/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20240118false000003478200000347822024-01-182024-01-18

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): January 18, 2024

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On January 18, 2024, 1st Source Corporation issued a press release that announced its fourth quarter earnings for 2023. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated January 18, 2024, with respect to 1st Source Corporation’s financial results for the fourth quarter ended December 31, 2023.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: January 18, 2024/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20231019false0000034782--12-3100000347822023-10-192023-10-19

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): October 19, 2023

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On October 19, 2023, 1st Source Corporation issued a press release that announced its third quarter earnings for 2023. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

The Board of Directors amended the Company’s bylaws effective October 19, 2023 to establish procedures to be followed by a shareholder seeking to nominate a director for election, in conformity with Securities and Exchange Commission Rule 14a-19 promulgated under the Securities and Exchange Act of 1934, also known as the “Universal Proxy Rule”, and procedures to be followed by a shareholder seeking to propose action for a vote at a meeting of shareholders.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated October 19, 2023, with respect to 1st Source Corporation’s financial results for the third quarter ended September 30, 2023.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: October 19, 2023/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20230720false000003478200000347822023-07-202023-07-20

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): July 20, 2023

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On July 20, 2023, 1st Source Corporation issued a press release that announced its second quarter earnings for 2023. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated July 20, 2023, with respect to 1st Source Corporation’s financial results for the second quarter ended June 30, 2023.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: July 20, 2023/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20230420false000003478200000347822023-04-202023-04-20

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): April 20, 2023

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On April 20, 2023, 1st Source Corporation issued a press release that announced its first quarter earnings for 2023. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated April 20, 2023, with respect to 1st Source Corporation’s financial results for the first quarter ended March 31, 2023.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: April 20, 2023/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20230119false000003478200000347822023-01-192023-01-19

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): January 19, 2023

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On January 19, 2023, 1st Source Corporation issued a press release that announced its fourth quarter earnings for 2022. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated January 19, 2023, with respect to 1st Source Corporation’s financial results for the fourth quarter ended December 31, 2022.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: January 19, 2023/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20221020false000003478200000347822022-10-202022-10-20

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): October 20, 2022

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On October 20, 2022, 1st Source Corporation issued a press release that announced its third quarter earnings for 2022. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated October 20, 2022, with respect to 1st Source Corporation’s financial results for the third quarter ended September 30, 2022.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: October 20, 2022/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20220721false000003478200000347822022-07-212022-07-21

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): July 21, 2022

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On July 21, 2022, 1st Source Corporation issued a press release that announced its second quarter earnings for 2022. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated July 21, 2022, with respect to 1st Source Corporation’s financial results for the second quarter ended June 30, 2022.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: July 21, 2022/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20220421false000003478200000347822022-04-212022-04-21

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): April 21, 2022

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On April 21, 2022, 1st Source Corporation issued a press release that announced its first quarter earnings for 2022. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated April 21, 2022, with respect to 1st Source Corporation’s financial results for the first quarter ended March 31, 2022.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: April 21, 2022/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20220120false000003478200000347822022-01-202022-01-20

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): January 20, 2022

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On January 20, 2022, 1st Source Corporation issued a press release that announced its fourth quarter earnings for 2021. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated January 20, 2022, with respect to 1st Source Corporation’s financial results for the fourth quarter ended December 31, 2021.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: January 20, 2022/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer

source-20211021false000003478200000347822021-10-212021-10-21

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): October 21, 2021

1st Source Corporation (Exact name of registrant as specified in its charter)

Indiana 0-623335-1068133 (State or other jurisdiction of incorporation)(Commission File No.)(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601 (Address of principal executive offices)     (Zip Code)

574-235-2000 (Registrant's telephone number, including area code)

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 - without par valueSRCEThe 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. o

ITEM 2.02    Results of Operations and Financial Condition.

On October 21, 2021, 1st Source Corporation issued a press release that announced its third quarter earnings for 2021. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein.

ITEM 9.01    Financial Statements and Exhibits.

Exhibit 99.1:    Press release dated October 21, 2021, with respect to 1st Source Corporation’s financial results for the third quarter ended September 30, 2021.

101        Pursuant to Rule 406 of Regulation S-T, the cover page is formatted in Inline XBRL (Inline eXtensible Business reporting Language).

104        Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

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.

1st SOURCE CORPORATION (Registrant)

Date: October 21, 2021/s/ BRETT A. BAUER Brett A. Bauer Treasurer and Chief Financial Officer Principal Accounting Officer