Form 4 for AMTM Amentum Holdings, Inc.
Accepted 2026-03-04 00:00:00 ET · period of report 2026-03-02 · accession 0001628280-26-014626 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-03-04 | 2026-03-02 | AMTM | Arnette Stephen A | COO | F - Tax | $30.70 | -750 | 96.4K | -0.8% | -$23.0K |
| D | 2026-03-04 | 2026-03-02 | AMTM | Arnette Stephen A | COO | M - OptEx | — | +2,808 | 97.1K | +3% | — |
| D | 2026-03-04 | 2026-03-02 | AMTM | Arnette Stephen A | COO | M - OptEx | $0.00 | -2,808 | 0 | -100% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-03-02 | F | D | 750 | $30.70 | 96,357 | D | — | — | (F2) Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
| 2 | Common | Common Stock | 2026-03-02 | M | A | 2,808 | — | 97,107 | D | — | — | (F1) Represents distribution of AMTM common stock upon vesting of restricted stock units. |
| 3 | Derivative | Restricted Stock Units | 2026-03-02 | M | D | 2,808 | $0.00 | 0 | D | — · — to — | 2,808 Common Stock | (F3) Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. (F4) The restricted stock units awarded vested on March 2, 2026. |