HYLN

hyln-202602240001759631FALSE00017596312026-02-242026-02-24

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): February 24, 2026

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNYSE American 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 2.02    Results of Operations and Financial Condition. On February 24, 2026, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended December 31, 2025. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated February 24, 2026.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:February 24, 2026 Thomas Healy Chief Executive Officer

hyln-202511110001759631FALSE00017596312025-11-112025-11-11

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 11, 2025

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNYSE American 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 2.02    Results of Operations and Financial Condition. On November 11, 2025, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended September 30, 2025. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated November 11, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:November 11, 2025 Thomas Healy Chief Executive Officer

hyln-202508120001759631FALSE00017596312025-08-122025-08-12

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, 2025

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNYSE American 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 2.02    Results of Operations and Financial Condition. On August 12, 2025, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended June 30, 2025. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated August 12, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:August 12, 2025 Thomas Healy Chief Executive Officer

hyln-202505130001759631FALSE00017596312025-05-132025-05-13

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): May 13, 2025

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNYSE American 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 2.02    Results of Operations and Financial Condition. On May 13, 2025, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended March 31, 2025. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated May 13, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:May 13, 2025 Thomas Healy Chief Executive Officer

hyln-202502250001759631FALSE00017596312025-02-252025-02-25

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): February 25, 2025

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNYSE American 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 2.02    Results of Operations and Financial Condition. On February 25, 2025, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended December 31, 2024. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated February 25, 2025.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:February 25, 2025 Thomas Healy Chief Executive Officer

hyln-202411140001759631FALSE00017596312024-11-142024-11-14

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 14, 2024

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNYSE American 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 2.02    Results of Operations and Financial Condition. On November 14, 2024, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended September 30, 2024. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated November 14, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:November 14, 2024 Thomas Healy Chief Executive Officer

hyln-202408060001759631FALSE00017596312024-08-062024-08-06

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

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On August 6, 2024, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended June 30, 2024. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated August 6, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:August 6, 2024 Thomas Healy Chief Executive Officer

hyln-202404300001759631FALSE00017596312024-04-302024-04-30

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 30, 2024

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On April 30, 2024, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended March 31, 2024. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated April 30, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:April 30, 2024 Thomas Healy Chief Executive Officer

hyln-202402130001759631FALSE00017596312024-02-132024-02-13

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): February 13, 2024

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On February 13, 2024, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter and year ended December 31, 2023. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated February 13, 2024.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:February 13, 2024 Thomas Healy Chief Executive Officer

hyln-202311080001759631FALSE00017596312023-11-082023-11-08

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

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On November 8, 2023, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended September 30, 2023. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated November 8, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:November 8, 2023 Thomas Healy Chief Executive Officer

hyln-202308080001759631FALSE00017596312023-08-082023-08-08

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): August 8, 2023

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On August 8, 2023, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended June 30, 2023. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated August 8, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:August 8, 2023 Thomas Healy Chief Executive Officer

hyln-202305090001759631FALSE00017596312023-05-092023-05-09

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): May 9, 2023

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On May 9, 2023, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended March 31, 2023. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated May 9, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:May 9, 2023 Thomas Healy Chief Executive Officer

hyln-202302280001759631FALSE00017596312023-02-282023-02-28

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): February 28, 2023

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On February 28, 2023, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter and year ended December 31, 2022. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated February 28, 2023.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:February 28, 2023 Thomas Healy Chief Executive Officer

hyln-202211080001759631FALSE00017596312022-11-082022-11-08

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, 2022

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On November 8, 2022, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended September 30, 2022. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated November 8, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:November 8, 2022 Thomas Healy Chief Executive Officer

hyln-202208090001759631FALSE00017596312022-08-092022-08-09

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

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On August 9, 2022, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended June 30, 2022. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated August 9, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:August 9, 2022 Thomas Healy Chief Executive Officer

hyln-202205090001759631FALSE00017596312022-05-092022-05-09

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): May 9, 2022

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On May 9, 2022, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended March 31, 2022. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated May 9, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:May 9, 2022 Thomas Healy Chief Executive Officer

1

hyln-202202230001759631FALSE00017596312022-02-232022-02-23

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): February 23, 2022

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882383-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 2.02    Results of Operations and Financial Condition. On February 23, 2022, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter and year ended December 31, 2021. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated February 23, 2022.

104Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:February 23, 2022 Thomas Healy Chief Executive Officer

1

hyln-202111090001759631FALSE00017596312021-11-092021-11-09

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, 2021

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882382-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park,TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 x 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 2.02    Results of Operations and Financial Condition. On November 9, 2021, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended September 30, 2021. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated November 9, 2021

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:November 9, 2021 Thomas Healy Chief Executive Officer

1

hyln-202108100001759631FALSE00017596312021-08-102021-08-10

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): August 10, 2021

HYLIION HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware001-3882382-2538002 (State or Other Jurisdiction of Incorporation)(Commission File Number)(I.R.S. Employer Identification No.)

1202 BMC Drive, Suite 100 Cedar Park, TX 78613 (Address of principal executive offices)(Zip Code)

(833) 495-4466 (Registrant’s telephone number, including area code) N/A (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 obligations of the registrant under any of the following provisions: o    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) o    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) o    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 value per shareHYLNNew York Stock Exchange

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 x 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 2.02    Results of Operations and Financial Condition. On August 10, 2021, Hyliion Holdings Corp. (the “Company”) issued a press release announcing certain financial and other results for the quarter ended June 30, 2021. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits. (d)Exhibits

Exhibit No.Description

99.1Press Release dated August 10, 2021

SIGNATURES

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

HYLIION HOLDINGS CORP.

By:/s/ Thomas Healy Date:August 10, 2021 Thomas Healy Chief Executive Officer

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8-K 1 ea140697-8k_hyliion.htm

CURRENT REPORT

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 11, 2021

HYLIION

HOLDINGS CORP.

(Exact name of registrant as specified in its charter)

Delaware

001-38823

82-2538002

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(I.R.S.

Employer

Identification No.)

1202 BMC Drive, Suite 100

Cedar Park, TX

78613

(Address of principal executive offices)

(Zip Code)

(833) 495-4466

(Registrant’s telephone number, including area code)

N/A

(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 obligations 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 class

Trading symbol(s)

Name of each exchange on which registered

Common Stock, $0.0001 par value per share

HYLN

New York Stock Exchange

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 11, 2021, Hyliion Holdings Corp. (the “Company”) issued a press release announcing its results for the first quarter of 2021. The full text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The information furnished in this Current Report on Form 8-K (including Exhibit 99.1) 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 to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

1

Item 9.01Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1

Press Release dated May 11, 2021

2

SIGNATURES

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

HYLIION

HOLDINGS CORP.

By: /s/ Thomas Healy

Date: May 11, 2021

Thomas Healy

Chief Executive Officer

3