UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 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~~March 2917, 2026

First Internet Bancorp

(Exact Name of Registrant as Specified in Its Charter)

Indiana

(State or Other Jurisdiction of Incorporation)

001-35750

20-3489991

(Commission File Number)

(IRS Employer Identification No.)

8701 E. 116th Street

46038

Fishers, Indiana

(Address of Principal Executive Offices)

(Zip Code)

(317) 532-7900

(Registrant's Telephone Number, Including Area Code)

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 (see General Instruction A.2. below):

☐ 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 Symbols

Name of each exchange on which registered

Common Stock, without par value

INBK

The Nasdaq Stock Market LLC

6.0% Fixed to Floating Subordinated Notes due 2029

INBKZ

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. ¨

Item 27.~~02 Results~~01 Regulation ofFD ~~Operations and Financial Condition~~Disclosure

On ~~January~~March 2917, 2026, First Internet Bancorp ~~(the "Company")~~ issued a press release announcing ~~its~~a ~~financial~~quarterly ~~results~~cash ~~for~~dividend ~~the~~of ~~quarter~~$0.06 ~~and~~per ~~year~~common ~~ended December 31, 2025~~share. A copy of the press release is furnished as Exhibit 99.1 to this report and is incorporated by reference herein.

OnThe ~~January~~information ~~29,~~contained ~~2026,~~in atthis ~~5:00~~Item p7.m.01 ~~(Eastern~~and ~~Time),~~Exhibit ~~the~~99.1 ~~Company~~hereto ~~will~~is ~~host~~being afurnished ~~conference~~and ~~call~~shall ~~and~~not ~~webcast~~be deemed to ~~discuss~~be ~~its~~“filed” ~~financial~~with ~~results~~the Securities and Exchange Commission for the ~~quarter~~purposes ~~and~~of ~~year~~Section ~~ended~~18 ~~December~~of ~~31,~~the ~~2025.~~Securities ~~The~~Exchange ~~electronic~~Act ~~presentation~~of ~~slides~~1934, ~~which~~as ~~will~~amended ~~accompany~~(the “Exchange Act”) or otherwise subject to the ~~call~~liabilities of that section and ~~webcast~~is not incorporated by reference into any filing of the Company under the Securities Act of 1933, ~~are~~as ~~furnished~~amended, or the Exchange Act, whether made before or after the date hereof, except as ~~Exhibit~~shall ~~99.2~~be ~~and~~expressly ~~are~~set ~~incorporated~~forth by specific reference ~~herein~~in such a filing.

The information contained in this Item 2.02, including Exhibit 99.1 and Exhibit 99.2, is being furnished and shall not be deemed to be “filed” for the 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, and shall not be deemed to be incorporated by reference into any filing made by us under the Exchange Act or Securities Act of 1933, as amended, regardless of any general incorporation language in any such filing, except as shall be expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits

Number

Description

Method of filing

99.1

Press release dated March 17, 2026

Furnished electronically

104

Cover Page Interactive Data File (embedded in the cover page formatted in inline XBRL)

Number

Description

Method of filing

99.1

Press release dated January 29, 2026

Furnished electronically

99.2

Presentation slides dated January 29, 2026

Furnished electronically

104

Cover Page Interactive Data File (embedded in the cover page formatted in inline XBRL)

SIGNATURES

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.

Dated:

~~January~~March 2917, 2026

FIRST INTERNET BANCORP

By:

/s/ Kenneth J. Lovik

Kenneth J. Lovik, Executive Vice President & Chief Financial Officer

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