# AMENTUM HOLDINGS INC (AMTM) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 023939101
Page URL: https://superinvestorclub.com/stock/AMTM
Last updated: 2026-07-08T13:36:09.663Z

## Summary

As of the most recent 13F filing period, AMENTUM HOLDINGS INC (AMTM) is held by 3 tracked superinvestors with an aggregate position value of $44.0M representing 016229824633517052 shares.

## Top institutional holders (3)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Sequoia Fund](https://superinvestorclub.com/manager/14) | Ruane, Cunniff & Goldfarb | 1622982 | $42.3M | 0.70% | 2026-03-31 |
| 2 | [Lee Ainslie](https://superinvestorclub.com/manager/58) | Maverick Capital | 46335 | $1.2M | 0.01% | 2026-03-31 |
| 3 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 17052 | $444,716 | 0.00% | 2026-03-31 |

## Ownership history (quarter-over-quarter)

- 2024-09-30: 2 holders, $83.2M aggregate, 0253048948532 shares
- 2024-12-31: 1 holders, $51.2M aggregate, 02436294 shares
- 2025-03-31: 1 holders, $43.6M aggregate, 02393039 shares
- 2025-06-30: 1 holders, $57.6M aggregate, 02441743 shares
- 2025-09-30: 1 holders, $58.0M aggregate, 02423748 shares
- 2025-12-31: 2 holders, $70.0M aggregate, 0239412918251 shares
- 2026-03-31: 3 holders, $44.0M aggregate, 016229824633517052 shares

## Recent congressional trades (1)

- 2024-10-31: Bill Keating (Democrat-MA) sale $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "AMENTUM HOLDINGS INC (AMTM) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/AMTM), aggregating SEC 13F, Form 4, and congressional disclosures."