Amentum (AMTM)Thompson Siegel & Walmsley LLC added to its stake +756K shares

2.28M

Shares reported · +756K vs prior quarter

0.85%

Disclosed portfolio weight

$47.2M

Reported value

Holdings as of

Jun 30, 2026

Filed

Aug 11, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Nov 20, 2025Federal contract · $23.2M obligatedNational Aeronautics and Space Administration awarded Amentum Holdings, Inc.: $23.2M obligated to date
2. Nov 24, 2025Federal contract · $24.1M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $24.1M obligated to date
3. Nov 25, 2025Federal contract · $22.7M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $22.7M obligated to date
4. Nov 26, 2025Federal contract · $55.5M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $55.5M obligated to date
5. Dec 17, 2025Federal contract · $43.3M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $43.3M obligated to date
6. Dec 19, 2025Federal contract · $20.0M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $20M obligated to date
7. Jan 16, 2026Federal contract · $23.1M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $23.1M obligated to date
8. Mar 12, 2026Federal contract · $657.6M obligatedDepartment of Homeland Security awarded Amentum Holdings, Inc.: $658M obligated to date
9. Mar 24, 2026Federal contract · $25.5M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $25.5M obligated to date
10. Apr 8, 2026Federal contract · $37.4M obligatedDepartment of the Treasury awarded Amentum Holdings, Inc.: $37.4M obligated to date
11. Jun 15, 2026Federal contract · $21.0M obligatedDepartment of Defense awarded Amentum Holdings, Inc.: $21M obligated to date
12. Aug 10, 2026Company filing · Form 8-K · ResultsReported its results

What came next

1. Sep 18, 2026Federal contract · $36.9M obligatedNational Aeronautics and Space Administration awarded Amentum Holdings, Inc.: $36.9M obligated to date
2. Sep 21, 2026Federal contract · $12.6M obligatedNational Aeronautics and Space Administration awarded Amentum Holdings, Inc.: $12.6M obligated to date
3. Sep 25, 2026Layoff notice · Space Commerce Way, Merritt Island, Kennedy Space Center, MERRITT ISLAND, FL, 32899Layoff notice filed in FL: 70 employees
4. Sep 28, 2026Company filing · Form 8-K · Executive changeChanged a top executive or board member“of Certain Officers The Board of Directors of Amentum Holdings, Inc. (the “Company”) approved an amendment and restatement of Steven J. Demetriou’s, the Executive Chair of the Amentum Holdings Board of Directors, employment agreement with the Company (the “Employment Agreement”).”

How to read SEC Form 13F-HR

Form 13F is the quarterly report in which investment managers that oversee $100 million or more list the US-listed stocks and some other securities they held on the last day of the quarter.

Full guide: What is an SEC Form 13F?

What else is on file for Amentum

For Amentum, OQRO holds 5 fund holdings reports (13F) and 7 federal contract awards dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its AMTM page.

How this filing works

• SEC Form 13F

Other disclosures at Amentum

• USAspending.gov award recordSep 28, 2026
• USAspending.gov award recordSep 28, 2026
• USAspending.gov award recordSep 24, 2026
• USAspending.gov award recordSep 22, 2026
• USAspending.gov award recordSep 18, 2026
• USAspending.gov award recordAug 27, 2026

Everything OQRO holds on this company is on its AMTM page.