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): June 11, 2025

WINTRUST FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)


Illinois	001-35077	36-3873352
(State or other jurisdiction of Incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

9700 West Higgins Road

Rosemont, Illinois 60018

(Address of principal executive offices)

Registrant’s telephone number, including area code (847) 939-9000

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 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, no par value	WTFC	The NASDAQ Global Select Market
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, no par value	WTFCM	The NASDAQ Global Select Market
Depositary Shares, Each Representing 1/1,000th Interest in a Share of	WTFCP	The NASDAQ Global Select Market
6.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E, no par value
Depositary Shares, Each Representing 1/1,000th Interest in a Share of	WTFCN	The NASDAQ Global Select Market
7.875% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series F, no par value	WTFCN	The NASDAQ Global Select Market

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 5.02.			Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On June 11, 2025, Richard L. Postma submitted his resignation from the Board of Directors of Wintrust Financial Corporation (the “Company”), effective immediately. Mr. Postma resigned for personal reasons. His resignation was not the result of any disagreement with the Company on any matter relating to its operations, policies or practices.

Signature

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.


			WINTRUST FINANCIAL CORPORATION (Registrant)
			By:			/s/Kathleen M. Boege
						Kathleen M. Boege Executive Vice President, Chief Legal Officer and Corporate Secretary

Date: June 13, 2025

WINTRUST FINANCIAL CORP 8-K