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 31, 2025

1st Source Corporation

(Exact name of registrant as specified in its charter)


Indiana	0-6233	35-1068133
(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 class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock - without par value

SRCE

The 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 7.01 Regulation FD Disclosure.

The executive officers of 1st Source Corporation intend to use the material filed herewith, in whole or in part, in one or more meetings with investors and analysts. A copy of the investor presentation is attached hereto as Exhibit 99.1.

1st Source Corporation does not intend for this Item 7.01 or Exhibit 99.1 to be treated as “filed” for purposes of the Securities Exchange Act of 1934, as amended, or incorporated into its filings under the Securities Act of 1933, as amended.

ITEM 9.01 Financial Statements and Exhibits.

The following exhibit shall not be deemed as “filed” for purposes of the Securities Exchange Act of 1934, as amended.

(d) Exhibit:


			99.1			1st Source Corporation Investor Presentation

			104			Cover Page Interactive Data File (Embedded within the InLine XBRL document).


						1st SOURCE CORPORATION
						(Registrant)


Date: October 31, 2025						/s/ BRETT A. BAUER
						Brett A. Bauer
						Treasurer and Chief Financial Officer
						Principal Accounting Officer

1ST SOURCE CORP 8-K