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way-20260217FALSE00019903542025FY00019903542026-02-172026-02-17

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 17, 2026 Waystar Holding Corp. (Exact name of registrant as specified in its charter)

Delaware001-4212584-2886542 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

1550 Digital Drive, #300 Lehi, Utah 84043 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: (844) 492-9782 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 SymbolName of each exchange on which registered Common Stock, par value $0.01 per shareWAYThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ¨ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 2.02             Results of Operations and Financial Condition. On February 17, 2026, Waystar Holding Corp. (the “Company”) issued a press release announcing earnings and other financial results for the fiscal quarter and fiscal year ended December 31, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference. The information in this Item 2.02, including the corresponding Exhibit 99.1, is being furnished and 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 under that section and shall not be deemed to be incorporated by reference into any filings under Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01             Financial Statements and Exhibits. (d)Exhibits.

Exhibit No.Description

99.1 Waystar Holding Corp. Press Release, dated February 17, 2026

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

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

Date: February 17, 2026 Waystar Holding Corp.

By:/s/ Gregory R. Packer Name:Gregory R. Packer Title:Chief Legal Officer

way-20251029FALSE00019903542025Q300019903542025-10-292025-10-29

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 29, 2025 Waystar Holding Corp. (Exact name of registrant as specified in its charter)

Delaware001-4212584-2886542 (State or other jurisdiction of incorporation)(Commission File Number)(IRS Employer Identification No.)

1550 Digital Drive, #300 Lehi, Utah 84043 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: (844) 492-9782 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 SymbolName of each exchange on which registered Common Stock, par value $0.01 per shareWAYThe 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 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 October 29, 2025, Waystar Holding Corp. (the “Company”) issued a press release announcing earnings and other financial results for the fiscal quarter and fiscal year ended September 30, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference. The information in this Item 2.02, including the corresponding Exhibit 99.1, is being furnished and 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 under that section and shall not be deemed to be incorporated by reference into any filings under Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01             Financial Statements and Exhibits. (d)Exhibits.

Exhibit No.Description

99.1 Waystar Holding Corp. Press Release, dated October 29, 2025

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

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

Date: October 29, 2025 Waystar Holding Corp.

By:/s/ Gregory R. Packer Name:Gregory R. Packer Title:Chief Legal Officer