Form 4 for AMTM Amentum Holdings, Inc.
Accepted 2025-11-18 00:00:00 ET · period of report 2025-11-15 · accession 0001628280-25-052958 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2025-11-18 | 2025-11-15+ | AMTM | Arnette Stephen A | COO | F - Tax | $22.07 | -4,651 | 36.0K | -11% | -$102.6K |
| DM | 2025-11-18 | 2025-11-15+ | AMTM | Arnette Stephen A | COO | M - OptEx | — | +19.1K | 41.0K | +87% | — |
| DM | 2025-11-18 | 2025-11-15+ | AMTM | Arnette Stephen A | COO | M - OptEx | $0.00 | -19.1K | 5,053 | -79% | $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 | 2025-11-16 | F | D | 1,120 | $22.07 | 46,065 | D | — | — | (F2) Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
| 2 | Common | Common Stock | 2025-11-16 | F | D | 1,231 | $22.07 | 39,805 | D | — | — | (F2) Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
| 3 | Common | Common Stock | 2025-11-16 | M | A | 3,681 | — | 43,486 | D | — | — | (F1) Represents distribution of AMTM common stock upon vesting of restricted stock units. |
| 4 | Common | Common Stock | 2025-11-16 | F | D | 897 | $22.07 | 42,589 | D | — | — | (F2) Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
| 5 | Common | Common Stock | 2025-11-16 | M | A | 4,596 | — | 47,185 | D | — | — | (F1) Represents distribution of AMTM common stock upon vesting of restricted stock units. |
| 6 | Common | Common Stock | 2025-11-15 | F | D | 1,403 | $22.07 | 35,983 | D | — | — | (F2) Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
| 7 | Common | Common Stock | 2025-11-15 | M | A | 5,758 | — | 37,386 | D | — | — | (F1) Represents distribution of AMTM common stock upon vesting of restricted stock units. |
| 8 | Common | Common Stock | 2025-11-16 | M | A | 5,053 | — | 41,036 | D | — | — | (F1) Represents distribution of AMTM common stock upon vesting of restricted stock units. |
| 9 | Derivative | Restricted Stock Units | 2025-11-16 | M | D | 4,596 | $0.00 | 0 | D | — · — to — | 4,596 Common Stock | (F3) Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. (F5) The restricted stock units awarded vested on November 16, 2025. |
| 10 | Derivative | Restricted Stock Units | 2025-11-16 | M | D | 3,681 | $0.00 | 0 | D | — · — to — | 3,681 Common Stock | (F3) Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. (F5) The restricted stock units awarded vested on November 16, 2025. |
| 11 | Derivative | Restricted Stock Units | 2025-11-15 | M | D | 5,758 | $0.00 | 11,515 | D | — · — to — | 5,758 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 November 15, 2025. |
| 12 | Derivative | Restricted Stock Units | 2025-11-16 | M | D | 5,053 | $0.00 | 5,053 | D | — · — to — | 5,053 Common Stock | (F3) Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. (F5) The restricted stock units awarded vested on November 16, 2025. |