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Date of Report (Date of earliest event reported): April 25, 2024

(Exact name of registrant as specified in its charter)

(Address of principal executive offices)     (Zip Code)

(Registrant's telephone number, including area code)

(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:

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 5.07 Submission of Matters to a Vote of Security Holders.

The following actions were taken by the shareholders of 1st Source Corporation (the “Company”) at the annual shareholders’ meeting held April 25, 2024:

The directors named below were elected to the Board of Directors, as follows:

Terms Expiring in April, 2027:

In addition, the following directors continued in office after the 2024 annual meeting:

The Audit Committee has appointed FORVIS‚ LLP as the independent registered public accounting firm for 1st Source for the fiscal year ending 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).

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.