AMTM — Amentum Holdings, Inc.
Price · 2024-09-30 → 2026-08-21
475 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2024-09-30.
Performance
Technicals
Others in Technology
Measured signals that fired on AMTM
| date | signal | measured base rate |
|---|---|---|
| 2026-08-12 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
| 2026-08-10 | Equal highs taken out structure | -0.70% over 21 days · t = -8.28 · n = 68,636 statistically distinguishable from its control group |
| 2026-08-04 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
| 2026-07-30 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
| 2026-07-24 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
| 2026-07-08 | Bollinger bandwidth breaks out of its own compression structure | -0.63% over 21 days · t = -2.80 · n = 7,196 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-05-06 | Heller John E. Chief Executive Officer | Shares withheld for tax | 8.2K | 24.89 | 203.7K |
| 2026-05-06 | Johnson Travis Barton Chief Financial Officer | Shares withheld for tax | 4.1K | 24.89 | 102.0K |
| 2026-05-06 | Arnette Stephen A Chief Operating Officer | Shares withheld for tax | 3.3K | 24.89 | 82.5K |
| 2026-05-06 | Mullen Sean Thomas Chief Growth Officer | Shares withheld for tax | 2.8K | 24.89 | 68.7K |
| 2026-05-06 | Bruning Jill L Chief Technology Officer | Shares withheld for tax | 2.7K | 24.89 | 68.0K |
| 2026-05-06 | Mullen Sean Thomas Chief Growth Officer | Option exercise | 9.1K | — | — |
| 2026-05-06 | Bruning Jill L Chief Technology Officer | Option exercise | 9.1K | — | — |
| 2026-05-06 | Heller John E. Chief Executive Officer | Option exercise | 18.1K | — | — |
| 2026-05-06 | Johnson Travis Barton Chief Financial Officer | Option exercise | 13.6K | — | — |
| 2026-05-06 | Arnette Stephen A Chief Operating Officer | Option exercise | 13.6K | — | — |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| AMERICAN SECURITIES LLC | 1.2B | 45.0M |
| Invesco Ltd. | 560.0M | 21.5M |
| BlackRock, Inc. | 465.3M | 17.8M |
| PRIMECAP MANAGEMENT CO/CA/ | 315.2M | 12.1M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 204.8M | 7.9M |
| VANGUARD CAPITAL MANAGEMENT LLC | 173.5M | 6.7M |
| FMR LLC | 145.5M | 5.6M |
| STATE STREET CORP | 132.5M | 5.1M |
| FRONTIER CAPITAL MANAGEMENT CO LLC | 128.6M | 4.9M |
| DIMENSIONAL FUND ADVISORS LP | 98.8M | 3.8M |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
Recent headlines
- Amentum awarded $974M maintenance, operations and engineering contract at NASA · 2026-08-20
- Why is Amentum stock climbing today? · 2026-08-20
- Amentum stock rises 3% on $974M NASA contract win · 2026-08-20
- Amentum (AMTM) Q3 2026 Earnings Call Transcript · 2026-08-19
- Amentum anticipates 3% NASA revenue impact in FY27 while lifting FY26 EPS outlook to $2.40-$2.50 · 2026-08-11
- S&P 500 Eyes Records, Fed Hike Odds Near 51% Before CPI: Stock Market Today · 2026-08-11 · benzinga
Ask the AI about AMTM
The assistant reads every block on this page — price history, filings, insider transactions, institutional positions, short volume, macro and the measured base rates — and says what it implies, quoting the number behind each claim and declaring what it does not have.
Everything on this page is live in the terminal.
Charts, filings, insider flow and the AI — open without an account.
Free plan for good. Pro is $69.99/mo, or $4.99 for a 7-day trial. See the plans →