# EDGAR Filing Document

**Accession Number:** 0002036060
**File Stem:** 0001193125-25-155497
**Filing Date:** 2025-7
**Character Count:** 4127
**Document Hash:** 99cba887faa3a668ece8ad82771aea9c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-155497.hdr.sgml**: 20250703

**ACCESSION NUMBER**: 0001193125-25-155497

**CONFORMED SUBMISSION TYPE**: 424B3

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20250703

**DATE AS OF CHANGE**: 20250703

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Security Midwest Bancorp, Inc.
- **CENTRAL INDEX KEY:** 0002036060
- **STANDARD INDUSTRIAL CLASSIFICATION:** SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 424B3
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-282067
- **FILM NUMBER:** 251105684

**BUSINESS ADDRESS:**
- **STREET 1:** 510 E. MONROE
- **CITY:** SPRINFIELD
- **STATE:** IL
- **ZIP:** 62701
- **BUSINESS PHONE:** (217) 789-3500

**MAIL ADDRESS:**
- **STREET 1:** 510 E. MONROE
- **CITY:** SPRINFIELD
- **STATE:** IL
- **ZIP:** 62701

**Filed Pursuant to Rule 424(b)(3) <br>Registration No. 333-282067** 

**PROSPECTUS SUPPLEMENT** 

**(To Prospectus Dated May 14, 2025,** 

**as Supplemented June 24, 2025)**![LOGO](g942678g0703103459305.jpg)

**(Proposed Holding Company for Security Bank, s.b.)** 

**Up to 1,150,000 shares of Common Stock** 

**(Subject to Increase to up to 1,322,500 shares)** 

This supplements the prospectus of Security Midwest Bancorp, Inc. dated May 14, 2025, as supplemented June 24, 2025. This prospectus supplement should be read together with the prospectus and the prospectus supplement dated June 24, 2025.

**We have extended the local community offering.** 

To facilitate the sale of additional shares, we have extended the local community offering under which we are offering shares to natural persons and trusts of natural persons residing in Sangamon County, Illinois. The local community offering will expire at 4:00 p.m., Central Time, on July 7, 2025, but we intend to select an earlier expiration time and date once we receive valid stock orders for at least 1,000,000 shares of common stock, which is the midpoint of the offering range, inclusive of the valid stock orders received in the subscription offering and the local community offering. In accordance with Security Bank, s.b.'s Plan of Conversion, we retain the right to accept or reject in our sole discretion, in whole or in part, any order received in the community offering.

**Completion of the conversion and offering is subject to certain conditions.** 

Completion of the conversion and offering remains subject to (1) receipt of all final regulatory approvals and (2) the sale of at least 850,000 shares of common stock, which is the minimum of our offering range.

Security Midwest Bancorp, Inc. has filed a registration statement (including a prospectus) with the Securities and Exchange Commission for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the Securities and Exchange Commission for more complete information about the issuer and this offering. You may obtain these documents for free by visiting the Securities and Exchange Commission's web site at www.sec.gov.

**THIS INVESTMENT INVOLVES A DEGREE OF RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.** 

**PLEASE READ "RISK FACTORS" BEGINNING ON PAGE 16 OF THE PROSPECTUS.** 

**THESE SECURITIES ARE NOT DEPOSITS OR ACCOUNTS AND ARE NOT INSURED OR GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY. NONE OF THE SECURITIES AND EXCHANGE COMMISSION, THE ILLINOIS DEPARTMENT OF FINANCIAL AND PROFESSIONAL REGULATION, DIVISION OF BANKING, THE BOARD OF GOVERNORS OF THE FEDERAL RESERVE SYSTEM OR ANY STATE SECURITIES REGULATOR HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS ACCURATE OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.**![LOGO](g942678g0703103459667.jpg)

For assistance, please contact the Stock Information Center at (312) 521-1600.

The date of this prospectus supplement is July 3, 2025.