Form 4 for AMTM Amentum Holdings, Inc.
Accepted 2026-05-07 16:29:07 ET · period of report 2026-05-06 · accession 0002011286-26-000017 · 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 | 2026-05-07 16:29 | 2026-05-06 | AMTM | Arnette Stephen A | COO | M - OptEx | — | +13.6K | 110.0K | +14% | — |
| D | 2026-05-07 16:29 | 2026-05-06 | AMTM | Arnette Stephen A | COO | F - Tax | $24.89 | -3,314 | 106.7K | -3% | -$82.5K |
| D | 2026-05-07 16:29 | 2026-05-06 | AMTM | Arnette Stephen A | COO | M - OptEx | $0.00 | -13.6K | 13.6K | -50% | $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 | 2026-05-06 | M | A | 13,609 | — | 109,966 | D | — | — | (F1) Represents distribution of AMTM common stock upon vesting of restricted stock units. |
| 2 | Common | Common Stock | 2026-05-06 | F | D | 3,314 | $24.89 | 106,652 | D | — | — | (F2) Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
| 3 | Derivative | Restricted Stock Units | 2026-05-06 | M | D | 13,609 | $0.00 | 13,609 | D | — · — to — | 13,609 Common Stock | (F3) Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. (F4) One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant. (F4) One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant. |