# EDGAR Filing Document

**Accession Number:** 0000030126
**File Stem:** 0000894189-26-002908
**Filing Date:** 2026-1
**Character Count:** 4804
**Document Hash:** 842ad202c837e34f08a3c7ad95e04b4c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000894189-26-002908.hdr.sgml**: 20260129

**ACCESSION NUMBER**: 0000894189-26-002908

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260129

**DATE AS OF CHANGE**: 20260129

**EFFECTIVENESS DATE**: 20260129

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** RMB INVESTORS TRUST
- **CENTRAL INDEX KEY:** 0000030126

**ORGANIZATION NAME:**
- **EIN:** 133536115
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-17226
- **FILM NUMBER:** 26576753

**BUSINESS ADDRESS:**
- **STREET 1:** ONE NORTH WACKER DRIVE
- **STREET 2:** SUITE 3500
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 8008743863

**MAIL ADDRESS:**
- **STREET 1:** ONE NORTH WACKER DRIVE
- **STREET 2:** SUITE 3500
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BURNHAM INVESTORS TRUST
- **DATE OF NAME CHANGE:** 20000327

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DREXEL BURNHAM FUND
- **DATE OF NAME CHANGE:** 19890706

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DREXEL EQUITY FUND INC
- **DATE OF NAME CHANGE:** 19751208

## Series and Classes Contracts Data

### RMB Small Cap Fund (Series ID: S000065670)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class I    | RMBBX         | C000212437 |

---

## Series and Classes Contracts Data

### RMB Small Cap Fund (Series ID: S000065670)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000212437 | Class I      | RMBBX           |

![image_0a.jpg](image_0a.jpg)

**RMB Small Cap Fund**

*Class I Ticker RMBBX*

**Supplement dated January 29, 2026 to the**

**Statutory Prospectus and Summary Prospectus dated May 1, 2025**

**IMPORTANT NOTICE REGARDING FUND REORGANIZATION** 

At a special meeting of the Board of Trustees (the "Board") of RMB Investors Trust (the "Trust") held on December 12, 2025, Curi Capital, LLC ("Curi") proposed, and the Board approved, the reorganization of the RMB Small Cap Fund (the "Small Cap Fund"), a series of the Trust, into the RMB SMID Cap Fund (the "SMID Cap Fund"), also a series of the Trust (the "Reorganization") (each, a "Fund" and together, the "Funds"). In making its decision, the Board considered the recommendation of Curi, the Funds' investment advisor, that the Reorganization has the potential to benefit shareholders of both Funds through increased efficiencies leading to lower Fund operating expenses borne by shareholders.

Pursuant to an Agreement and Plan of Reorganization, the Small Cap Fund will transfer all of its assets and liabilities to the SMID Cap Fund and Class I shareholders of the Small Cap Fund will receive the same class of shares of the SMID Cap Fund that are equal in value to their shares of the Small Cap Fund that they held immediately prior to the closing of the Reorganization (although the number of shares and the net asset value per share may be different). Upon receipt of the SMID Cap Fund shares, the shares of the Small Cap Fund will be null and void. Shareholders of the Small Cap Fund will not pay any sales load, commission, or other similar fee in connection with the SMID Cap Fund shares received in the Reorganization. Expenses associated with the Reorganization will be borne by the Small Cap Fund to the extent of the Fund's estimated operating expense reduction during the first year following completion of the Reorganization.

It is currently anticipated that the Reorganization will be completed as of the close of business on or about April 24, 2026. It is also intended that the Reorganization will qualify as a tax-free reorganization under the Internal Revenue Code of 1986, as amended, which means that generally no gain or loss will be recognized for federal income tax purposes by the Small Cap Fund or its shareholders as a direct result of the Reorganization. However, prior to completion of the Reorganization, the Small Cap Fund may make net investment income and capital gains distributions to shareholders. Shareholders of the Small Cap Fund should consult their tax advisors regarding the effect of the Reorganization and income and capital gains distributions on their particular tax situation.

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Shareholders of the Small Cap Fund will receive an Information Statement/Prospectus that describes the Reorganization in greater detail, as well as important information about the SMID Cap Fund. The Board determined that the Reorganization does not require approval by the Funds' shareholders.

**Please retain this Supplement with the Statutory Prospectus and the**

**Summary Prospectus.**

&nbsp;&nbsp;&nbsp;&nbsp;- 2 -

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