# EDGAR Filing Document

**Accession Number:** 0000730044
**File Stem:** 0001104659-26-055409
**Filing Date:** 2026-5
**Character Count:** 3106
**Document Hash:** 46e36a16cd76387b6b9c992143fa23af
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-055409.hdr.sgml**: 20260505

**ACCESSION NUMBER**: 0001104659-26-055409

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260505

**DATE AS OF CHANGE**: 20260505

**EFFECTIVENESS DATE**: 20260505

**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:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-86966
- **FILM NUMBER:** 26941468

**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           |

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| ![](tm2613564d3_497jimg01.jpg) | 1095 Avenue of the Americas<br> New York, NY 10036-6797<br> +1 212 698 3500 Main <br> +1 212 698 3599 Fax <br> www.dechert.com |

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VIA EDGAR

May 5, 2026

Securities and Exchange Commission<br> 100 F Street, N.E.<br> Washington, D.C. 20549

Re: Morgan Stanley Long Duration Government Opportunities Fund <br> File Nos. 2-86966; 811-3870

Ladies and Gentlemen:

On behalf of Morgan Stanley Long Duration Government Opportunities Fund ("Registrant") and pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the "Securities Act"), I hereby certify that (i) the form of prospectus and statement of additional information contained in Post-Effective Amendment No. 79 to Registrant's Registration Statement on Form N-1A, filed on April 30, 2026, constituting the most recent amendment to this Registration Statement (the "Amendment"), that would have been filed pursuant to Rule 497(c) under the Securities Act would not have differed from those contained in the Amendment, and (ii) the text of the Amendment was filed electronically with the Securities and Exchange Commission on April 30, 2026, accession number 0001133228-26-007508.

If you have any questions, please feel free to contact me at 212.698.3526 (tel) or 212.698.3599 (fax).

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| Very truly yours, |
| /s/ Allison Fumai |
| Allison Fumai |

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