# EDGAR Filing Document

**Accession Number:** 0000795264
**File Stem:** 0001104659-25-118403
**Filing Date:** 2025-12
**Character Count:** 6923
**Document Hash:** 3df4b7a5546f540b93445f24acb1cf73
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-118403.hdr.sgml**: 20251204

**ACCESSION NUMBER**: 0001104659-25-118403

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251204

**DATE AS OF CHANGE**: 20251204

**EFFECTIVENESS DATE**: 20251204

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** THOMPSON IM FUNDS INC
- **CENTRAL INDEX KEY:** 0000795264

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-06418
- **FILM NUMBER:** 251548984

**BUSINESS ADDRESS:**
- **STREET 1:** 1255 FOURIER DRIVE
- **STREET 2:** SUITE 200
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53717
- **BUSINESS PHONE:** 608-827-5700

**MAIL ADDRESS:**
- **STREET 1:** 1255 FOURIER DRIVE
- **STREET 2:** SUITE 200
- **CITY:** MADISON
- **STATE:** WI
- **ZIP:** 53717

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** THOMPSON PLUMB FUNDS INC
- **DATE OF NAME CHANGE:** 19970401

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** THOMPSON UNGER & PLUMB FUNDS INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MADISON TOTAL RETURN FUND INC
- **DATE OF NAME CHANGE:** 19861222

## Series and Classes Contracts Data

### Thompson LargeCap Fund (Series ID: S000002451)

---

|  |  |  |
|:---|:---|:---|
| Class Name             | Ticker Symbol | Class ID   |
| Thompson LargeCap Fund | thpgx         | C000006581 |

---

### Thompson Bond Fund (Series ID: S000002452)

---

|  |  |  |
|:---|:---|:---|
| Class Name         | Ticker Symbol | Class ID   |
| Thompson Bond Fund | thopx         | C000006582 |

---

### Thompson MidCap Fund (Series ID: S000021538)

---

|  |  |  |
|:---|:---|:---|
| Class Name           | Ticker Symbol | Class ID   |
| Thompson MidCap Fund | thpmx         | C000061640 |

---

## Series and Classes Contracts Data

### Thompson LargeCap Fund (Series ID: S000002451)

| Class ID   | Class Name             | Ticker Symbol   |
|:---|:---|:---|
| C000006581 | Thompson LargeCap Fund | thpgx           |

### Thompson Bond Fund (Series ID: S000002452)

| Class ID   | Class Name         | Ticker Symbol   |
|:---|:---|:---|
| C000006582 | Thompson Bond Fund | thopx           |

### Thompson MidCap Fund (Series ID: S000021538)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000061640 | Thompson MidCap Fund | thpmx           |

**Registration No. 33-6418** 

**1940 Act File No. 811-4946** 

**Filed Pursuant to Rule 497(e)**

**THOMPSON IM FUNDS, INC.**

**LARGECAP FUND**

**MIDCAP FUND**

**BOND FUND**

**Supplement Dated December 4, 2025, to Statement of Additional Information Dated March 31, 2025**

<u>Changes to the Board of Directors and Committees</u>

Effective December 2, 2025, Cornelia Boyle retired as a Director of Thompson IM Funds, Inc. (the "Investment Company"), including from her positions as a member of the Audit Committee and Nominating Committee of the Board of Directors (the "Board"). Accordingly, all references to Ms. Boyle in the Statement of Additional Information are hereby removed

Effective December 1, 2025, Aaron Olver has been appointed by the Board as a Director of the Investment Company and as a member of the Nominating Committee and Audit Committee thereof. Mr. Olver is not an "interested person" of the Investment Company. Accordingly, the table on page 24 of the Statement of Additional Information is hereby supplemented with the following information

 

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| | | | | |
|:---|:---|:---|:---|:---|
| **Name and**<br> **Age** | **Position(s) Held <br> with<br> Thompson IM <br> Funds, Inc.** <sup>(1)</sup> | **Principal Occupation(s)**<br> **During Past Five Years** | **Number of<br> Thompson<br> IM Funds<br> Overseen<br> by Director** | **Other**<br> **Directorships**<br> **Held<br> by Director** |
| Aaron D. Olver<br>Birth date: 3/24/74  | Director since 2025 | ▪ Managing Director, University Research Park, Inc. | 3 |  |

---

<sup>(1)</sup> Officers of the Investment Company serve one-year terms, subject to annual reappointment by the Board of Directors. Directors of the Investment Company serve a term of indefinite length until their resignation or removal, and stand for re-election by shareholders as and when required under the 1940 Act.

The information on page 27 of the Statement of Additional Information under the heading "Director Qualifications and Relevant Experience" is supplemented with the following:

*Aaron Olver* has extensive experience in executive leadership, financial oversight, and board governance across public, private, and nonprofit sectors. Since 2014, he has served as Managing Director of University Research Park, Inc., where he leads the University of Wisconsin- Madison's technology-focused real estate company. In this role, he reports directly to a board of trustees and serves as lead staff for that board's Audit, Investment, Nominating & Governance, and Risk Management Committees. Beyond this executive role, Mr. Olver brings substantial board experience, including serving as an independent director of Kikkoman Foods, Inc., as a trustee of the William F. Vilas Trust, and as a director of the Greater Madison Chamber of Commerce, where he served on the executive committee and as board chair and had responsibilities overseeing executive compensation, audit, nominations, and board governance. Additionally, he has served on a number of other non-profit boards, where he has worked directly on audit, investment management, financial reporting, and collaborated with external auditors and investment advisors. Mr. Olver is the former Secretary of Commerce of the State of Wisconsin. Mr. Olver holds a Bachelor of Arts degree in Economics (with Honors and Mathematical Emphasis) from the University of Wisconsin-Madison as well as a Master of Arts degree and a Bachelor of Arts degree in Philosophy, Politics, & Economics from Oxford University, where he studied as a Rhodes Scholar.

The table on page 29 of the Statement of Additional Information is supplemented with the following information:

---

| | | | |
|:---|:---|:---|:---|
| **Director** | **Fund** | **Dollar Range of** <br> **Equity Securities** | **Aggregate Dollar Range of<br> Equity Securities<br> in all Funds Overseen by <br> Director in Family<br> of Investment Companies** |
| Aaron D. Olver | LargeCap Fund<br> MidCap Fund<br> Bond Fund | None<br> None<br> None | None |

---

In light of Ms. Boyle's retirement, the Nominating Committee has selected Joyce Minor to serve as its new Chairman.

<u>Change in the Chief Financial Officer and Treasurer</u>

Effective November 3, 2025, Penny Hubbard has replaced James DiCristo as Chief Financial Officer and Treasurer of Thompson IM Funds, Inc. Accordingly, all references to Mr. DiCristo in the Statement of Additional Information are hereby removed.