# EDGAR Filing Document

**Accession Number:** 0000730044
**File Stem:** 0001104659-26-018150
**Filing Date:** 2026-2
**Character Count:** 3372
**Document Hash:** c93be476e63834ee787ad0858076d346
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-018150.hdr.sgml**: 20260220

**ACCESSION NUMBER**: 0001104659-26-018150

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260220

**DATE AS OF CHANGE**: 20260220

**EFFECTIVENESS DATE**: 20260220

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Morgan Stanley Long Duration Government Opportunities Fund
- **CENTRAL INDEX KEY:** 0000730044

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-86966
- **FILM NUMBER:** 26659937

**BUSINESS ADDRESS:**
- **STREET 1:** 1585 BROADWAY
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036
- **BUSINESS PHONE:** 800-869-6397

**MAIL ADDRESS:**
- **STREET 1:** 1585 BROADWAY
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MORGAN STANLEY U.S. GOVERNMENT SECURITIES TRUST
- **DATE OF NAME CHANGE:** 20210429

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MORGAN STANLEY US GOVERNMENT SECURITIES TRUST
- **DATE OF NAME CHANGE:** 20010618

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MORGAN STANLEY DEAN WITTER US GOVERNMENT SECURITIES TRUST
- **DATE OF NAME CHANGE:** 19980622

## Series and Classes Contracts Data

### Morgan Stanley Long Duration Government Opportunities Fund (Series ID: S000002426)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000006467 | A            | USGAX           |
| C000006469 | L            | USGCX           |
| C000006470 | I            | USGDX           |
| C000155939 | Class C      | MSGVX           |

![](j2659146_ba001.jpg)

*February 20, 2026*

Supplement

SUPPLEMENT DATED FEBRUARY 20, 2026 TO THE SUMMARY PROSPECTUS AND PROSPECTUS OF

Morgan Stanley Long Duration Government Opportunities Fund (the "Fund"), dated April 30, 2025, as supplemented

Effective immediately, the portfolio managers of the Fund are Gregory Finck and Andrew Szczurowski.

Accordingly, the Summary Prospectus and Prospectus are hereby amended as follows:

The sections of the Summary Prospectus titled "Fund Management—Portfolio Managers" and the Prospectus titled "Fund Summary—Fund Management—Portfolio Managers" are hereby deleted in their entirety and replaced with the following:

**Portfolio Managers.** Information about the members jointly and primarily responsible for the day-to-day management of the Fund's portfolio is shown below:

---

| | | |
|:---|:---|:---|
| **Name** | **Title with Adviser** | **Date Began Managing Fund** |
| Gregory Finck | Managing Director | February 2026 |
| Andrew Szczurowski, CFA | Managing Director | May 2023 |

---

The second paragraph of the section of the Prospectus titled "Fund Management" is hereby deleted in its entirety and replaced with the following:

The team consists of portfolio managers and analysts. Current members of the team jointly and primarily responsible for the day-to-day management of the Fund's portfolio are Gregory Finck and Andrew Szczurowski, CFA. Messrs. Finck and Szczurowski are Managing Directors of the Adviser, manage other funds and have been employed by the Morgan Stanley organization for more than five years.

**Please retain this supplement for future reference.**

MSLDGOSUMPROPSPT 2/26

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