Stock ownership · SEC 13F · Q4 2025
AMENTUM HOLDINGS INC
A breakdown of AMENTUM HOLDINGS INC's institutional base (CUSIP 023939101): the holders, the concentration among them, and what changed last quarter.
- $2.5M
- Reported value
- 6
- Institutions
- 100%
- Top-5 share
The verdict
According to SEC Form 13F-HR filings in this corpus, AMENTUM HOLDINGS INC ranks #661 of 775 tracked securities by reported institutional value (largest first), matching the /stocks listing among names with ≥5 reporting holders. 6 institutions report $2.5M as of Q4 2025, with ownership held overwhelmingly by a small core of institutions.
- 6
- institutions hold it
- $2.5M
- reported 13F value
- 100%
- held by top 5
- #661
- of 775 by value
Based on long positions reported to the SEC as of Q4 2025; 13F omits shorts, options and non-US holdings.
According to SEC Form 13F-HR filings in this corpus, AMENTUM HOLDINGS INC ranks #661 of 775 tracked securities by reported institutional value (largest first), matching the /stocks listing among names with ≥5 reporting holders.
How 13F ownership is computed · All tracked stocks · Concentration rankings
SEC Form 13F-HR ownership desk
CUSIP 023939101 · Q4 2025 $3M reported
VALUE-LIGHT · HOLDERS-FOCUS · CONC-DOM · PHOTO-FINISH · ACTIVITY-MID · BOOK-MID
- VALUE-LIGHT #661/775
- HOLDERS-FOCUS 6 filers
- CONC-DOM 100% top-5
- PHOTO-FINISH GLOBAL X FUND GLB X…
- ACTIVITY-MID 3 new
- BOOK-MID 6Q history
Photo-finish peer on reported value: GLOBAL X FUND GLB X NSDQ
Read with: Ownership concentration guide - AMENTUM HOLDINGS INC's top-five holders account for 100% of reported value — read concentration before treating any single filer as a signal.
Reported-value neighbourhood · AMENTUM HOLDINGS INC
Nearest tracked securities by aggregate 13F reported value, not a full corpus reprint.
Institutional ownership over time
The number of institutions reporting a AMENTUM HOLDINGS INC position has risen from 5 to 6 over the last 6 quarters of 13F filings.
Top Institutional Holders
| # | Institution | Shares | Value | Share of reported |
|---|---|---|---|---|
| 1 | HAHN CAPITAL MANAGEMENT LLC | 61,962 | $1.8M | 71.1% |
| 2 | Alpine Global Management, LLC | 25,000 | $725K | 28.7% |
| 3 | Anchor Investment Management, LLC | 87 | $3K | 0.1% |
| 4 | Bell Investment Advisors, Inc | 60 | $2K | 0.1% |
| 5 | MidFirst Bank | 33 | $957 | 0.0% |
| 6 | TD Capital Management LLC | 18 | $522 | 0.0% |
Investment Discretion
SEC Form 13F requires each institutional filer to report whether it exercises sole or shared discretion over a position. Among AMENTUM HOLDINGS INC's reported holders for Q4 2025, by reported value:
Latest Quarter Activity · Q4 2025
New positions (3)
Complete exits (6)
Frequently Asked Questions
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Nationwide stocks with similar institutional value or holder count
Two 13F-derived peer sets for AMENTUM HOLDINGS INC: nearest aggregate reported value and nearest institutional holder count, not catalog browse links.
Similar reported value
Nearest stocks by aggregate 13F reported value ($2.5M here).
Similar holder count
Nearest stocks by number of disclosing 13F holders (6 here).
Source: U.S. Securities and Exchange Commission (SEC) - EDGAR Form 13F-HR institutional holdings filings · Q4 2025 13F-HR discloses long US-listed equity positions of managers with $100M+ qualifying assets, filed within 45 days of period end. Short positions and most derivatives are not disclosed.
PlainFundData is rendered directly from SEC EDGAR Form 13F-HR institutional holdings filings, no number is typed in by an editor. Holder lists, concentration, and reported value on this page are aggregated live from those 13F-HR extracts. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-05-16.