Amentum Holdings (AMTM)
Amentum Holdings on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, federal contracts, earnings dates and insider trades. Listed on NYSE.
12.2M
Short interest
settlement 2026-09-15
7.3
Days to cover
+2.5 days vs prior
47.9%
Short share of volume
2026-10-08
89
Fails to deliver
settlement 2026-09-11
Mon 23 Nov
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-08.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 15 September 2026, short interest in AMTM is 12,229,137 shares, up 1,577,703 shares over the last month. Over the last 48 readings it ranged from 376,113 shares (30 September 2024) to 13,878,459 shares (15 May 2026). At the reported average volume of 1.7M shares a day that is 7.3 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-15 | 12,229,137 | +1.1% | 1,667,108 | 7.34 |
| 2026-08-31 | 12,095,846 | +13.6% | 2,520,426 | 4.80 |
| 2026-08-14 | 10,651,434 | -14.0% | 2,537,089 | 4.20 |
| 2026-07-31 | 12,385,682 | -7.9% | 1,751,601 | 7.07 |
| 2026-07-15 | 13,453,698 | -2.1% | 1,913,453 | 7.03 |
| 2026-06-30 | 13,742,445 | +1.1% | 2,249,473 | 6.11 |
| 2026-06-15 | 13,599,381 | -1.8% | 1,698,001 | 8.01 |
| 2026-05-29 | 13,844,021 | -0.3% | 2,196,032 | 6.30 |
| 2026-05-15 | 13,878,459 | +0.2% | 2,606,357 | 5.32 |
| 2026-04-30 | 13,853,120 | +17.9% | 1,616,850 | 8.57 |
| 2026-04-15 | 11,750,088 | +3.3% | 1,679,746 | 7.00 |
| 2026-03-31 | 11,373,750 | +4.7% | 1,804,494 | 6.30 |
| 2026-03-13 | 10,860,074 | +11.0% | 1,989,570 | 5.46 |
| 2026-02-27 | 9,780,372 | +8.3% | 1,771,320 | 5.52 |
| 2026-02-13 | 9,028,792 | +8.0% | 3,414,421 | 2.64 |
| 2026-01-30 | 8,360,229 | +0.6% | 1,818,713 | 4.60 |
| 2026-01-15 | 8,306,755 | +17.9% | 1,983,960 | 4.19 |
| 2025-12-31 | 7,043,142 | +0.6% | 1,553,074 | 4.53 |
| 2025-12-15 | 7,000,683 | -26.7% | 2,555,364 | 2.74 |
| 2025-11-28 | 9,555,161 | +27.1% | 4,417,671 | 2.16 |
| 2025-11-14 | 7,519,724 | -22.8% | 1,260,105 | 5.97 |
| 2025-10-31 | 9,745,819 | +3.3% | 1,217,130 | 8.01 |
| 2025-10-15 | 9,431,953 | -1.4% | 1,849,238 | 5.10 |
| 2025-09-30 | 9,562,783 | +11.9% | 2,020,911 | 4.73 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 8 October 2026, the short share of AMTM volume is 47.9%, down 14.0 points over the last five sessions. Over the last 30 readings it ranged from 32.9% (29 September 2026) to 78.3% (7 October 2026). The latest reading is 5.6 points below the 30-session average of 53.5%, on 1.1M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-08 | 508K | 1.1M | 47.9% | 0 |
| 2026-10-07 | 346K | 441K | 78.3% | 0 |
| 2026-10-06 | 292K | 516K | 56.5% | 50 |
| 2026-10-05 | 336K | 617K | 54.5% | 0 |
| 2026-10-02 | 532K | 1.1M | 48.7% | 0 |
| 2026-10-01 | 379K | 612K | 61.9% | 0 |
| 2026-09-30 | 228K | 532K | 42.8% | 5 |
| 2026-09-29 | 413K | 1.3M | 32.9% | 0 |
| 2026-09-28 | 180K | 484K | 37.3% | 1,194 |
| 2026-09-25 | 367K | 594K | 61.8% | 1,451 |
| 2026-09-24 | 242K | 419K | 57.8% | 760 |
| 2026-09-23 | 238K | 439K | 54.4% | 498 |
| 2026-09-22 | 333K | 702K | 47.4% | 0 |
| 2026-09-21 | 239K | 470K | 50.8% | 203 |
| 2026-09-18 | 278K | 490K | 56.7% | 17 |
| 2026-09-17 | 363K | 503K | 72.1% | 1 |
| 2026-09-16 | 323K | 510K | 63.4% | 0 |
| 2026-09-15 | 414K | 660K | 62.7% | 1,079 |
| 2026-09-14 | 312K | 591K | 52.8% | 850 |
| 2026-09-11 | 205K | 341K | 60.0% | 83 |
| 2026-09-10 | 239K | 443K | 53.8% | 23 |
| 2026-09-09 | 422K | 717K | 58.8% | 1,878 |
| 2026-09-08 | 605K | 909K | 66.5% | 308 |
| 2026-09-04 | 243K | 420K | 57.9% | 1,532 |
| 2026-09-03 | 205K | 534K | 38.5% | 3 |
| 2026-09-02 | 439K | 739K | 59.4% | 28 |
| 2026-09-01 | 410K | 745K | 55.1% | 341 |
| 2026-08-31 | 205K | 507K | 40.5% | 0 |
| 2026-08-28 | 154K | 397K | 38.7% | 300 |
| 2026-08-27 | 252K | 715K | 35.3% | 1 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 11 September 2026, the fails-to-deliver balance in AMTM is 89 shares, up 83 shares over the last settlement date. Over the last 30 readings it ranged from 6 shares (9 September 2026) to 421,828 shares (27 May 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-11 | 89 | $19.56 | $2K |
| 2026-09-09 | 6 | $20.14 | $121 |
| 2026-09-08 | 147 | $20.06 | $3K |
| 2026-09-01 | 398 | $19.99 | $8K |
| 2026-08-26 | 3,688 | $20.26 | $75K |
| 2026-08-20 | 49,601 | $21.03 | $1.0M |
| 2026-08-13 | 166 | $22.52 | $4K |
| 2026-07-31 | 609 | $21.73 | $13K |
| 2026-07-27 | 4,553 | $22.55 | $103K |
| 2026-07-17 | 12 | $20.77 | $249 |
| 2026-07-14 | 904 | $20.43 | $18K |
| 2026-07-10 | 42 | $21.30 | $895 |
| 2026-07-07 | 1,526 | $22.25 | $34K |
| 2026-07-02 | 3,045 | $20.20 | $62K |
| 2026-06-25 | 1,157 | $20.38 | $24K |
| 2026-06-22 | 753 | $21.66 | $16K |
| 2026-06-17 | 66 | $22.16 | $1K |
| 2026-06-16 | 9,711 | $22.42 | $218K |
| 2026-06-12 | 4,847 | $22.08 | $107K |
| 2026-06-11 | 79 | $22.00 | $2K |
| 2026-06-10 | 1,533 | $22.51 | $35K |
| 2026-06-09 | 194 | $22.61 | $4K |
| 2026-06-02 | 2,372 | $24.07 | $57K |
| 2026-05-27 | 421,828 | $22.91 | $9.7M |
| 2026-05-19 | 971 | $23.29 | $23K |
| 2026-05-14 | 482 | $23.15 | $11K |
| 2026-05-04 | 6,469 | $25.65 | $166K |
| 2026-05-01 | 790 | $26.23 | $21K |
| 2026-04-29 | 3,873 | $25.90 | $100K |
| 2026-04-20 | 100 | $27.58 | $3K |
Insider trades
SEC Form 4, newest first, 50 of 91 shown. JSONNo open-market insider trades were reported for AMTM in the last 90 days. The most recent filings are listed below. Latest filing: Thompson Christopher M.T. (Director) on 2026-08-14.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-08-14 | Thompson Christopher M.T. | Director | Gift | 4K | $0.00 | $0 | 6K |
| 2026-05-06 | Arnette Stephen A | Chief Operating Officer | Tax withholding | 3K | $24.89 | $82K | 107K |
| 2026-05-06 | Arnette Stephen A | Chief Operating Officer | Option exercise | 14K | price not stated in the filing | not stated | 110K |
| 2026-05-06 | Bruning Jill L | Chief Technology Officer | Tax withholding | 3K | $24.89 | $68K | 197K |
| 2026-05-06 | Bruning Jill L | Chief Technology Officer | Option exercise | 9K | price not stated in the filing | not stated | 200K |
| 2026-05-06 | Johnson Travis Barton | Chief Financial Officer | Option exercise | 14K | price not stated in the filing | not stated | 122K |
| 2026-05-06 | Johnson Travis Barton | Chief Financial Officer | Tax withholding | 4K | $24.89 | $102K | 118K |
| 2026-05-06 | Mullen Sean Thomas | Chief Growth Officer | Option exercise | 9K | price not stated in the filing | not stated | 35K |
| 2026-05-06 | Mullen Sean Thomas | Chief Growth Officer | Tax withholding | 3K | $24.89 | $69K | 32K |
| 2026-05-06 | Heller John E. | Chief Executive Officer | Tax withholding | 8K | $24.89 | $204K | 376K |
| 2026-05-06 | Heller John E. | Chief Executive Officer | Option exercise | 18K | price not stated in the filing | not stated | 384K |
| 2026-03-04 | Bruning Jill L | Chief Technology Officer | Gift | 30K | $0.00 | $0 | 191K |
| 2026-03-02 | Arnette Stephen A | Chief Operating Officer | Option exercise | 3K | price not stated in the filing | not stated | 97K |
| 2026-03-02 | Arnette Stephen A | Chief Operating Officer | Tax withholding | 750 | $30.70 | $23K | 96K |
| 2026-02-17 | St. Mary Michele T | Chief Legal Officer & GC | Tax withholding | 2K | $30.05 | $69K | 27K |
| 2026-02-17 | St. Mary Michele T | Chief Legal Officer & GC | Option exercise | 7K | price not stated in the filing | not stated | 29K |
| 2026-02-06 | Vollmer John C. | Director | Option exercise | 12K | price not stated in the filing | not stated | 425K |
| 2026-02-06 | Vollmer John C. | Director | Grant | 5K | $0.00 | $0 | 430K |
| 2026-02-06 | EBERHART RALPH E | Director | Option exercise | 12K | price not stated in the filing | not stated | 43K |
| 2026-02-06 | EBERHART RALPH E | Director | Grant | 5K | $0.00 | $0 | 48K |
| 2026-02-06 | Brooks Vincent K | Director | Option exercise | 12K | price not stated in the filing | not stated | 22K |
| 2026-02-06 | Brooks Vincent K | Director | Grant | 5K | $0.00 | $0 | 27K |
| 2026-02-06 | Rowland Sandra E. | Director | Grant | 5K | $0.00 | $0 | 20K |
| 2026-02-06 | Rowland Sandra E. | Director | Option exercise | 12K | price not stated in the filing | not stated | 15K |
| 2026-02-06 | IRELAND SUSAN LESLIE | Director | Grant | 5K | $0.00 | $0 | 9K |
| 2026-02-06 | Loughran Barbara | Director | Grant | 5K | $0.00 | $0 | 10K |
| 2026-02-06 | Thompson Christopher M.T. | Director | Grant | 5K | $0.00 | $0 | 5K |
| 2026-01-28 | Heller John E. | Chief Executive Officer | Tax withholding | 20K | $35.71 | $706K | 366K |
| 2026-01-28 | Heller John E. | Chief Executive Officer | Option exercise | 52K | price not stated in the filing | not stated | 386K |
| 2025-12-17 | Mullen Sean Thomas | Chief Growth Officer | Option exercise | 9K | price not stated in the filing | not stated | 30K |
| 2025-12-17 | Mullen Sean Thomas | Chief Growth Officer | Tax withholding | 4K | $28.67 | $120K | 26K |
| 2025-12-05 | Burton Darren | Chief People Officer | Tax withholding | 1K | $28.88 | $40K | 24K |
| 2025-12-05 | Burton Darren | Chief People Officer | Option exercise | 3K | price not stated in the filing | not stated | 25K |
| 2025-11-17 | DEMETRIOU STEVEN J. | Executive Chair | Tax withholding | 17K | $21.49 | $367K | 709K |
| 2025-11-17 | DEMETRIOU STEVEN J. | Executive Chair | Grant | 111K | $0.00 | $0 | 820K |
| 2025-11-17 | DEMETRIOU STEVEN J. | Executive Chair | Option exercise | 43K | price not stated in the filing | not stated | 726K |
| 2025-11-17 | Arnette Stephen A | Chief Operating Officer | Grant | 47K | $0.00 | $0 | 94K |
| 2025-11-17 | Arnette Stephen A | Chief Operating Officer | Option exercise | 1K | price not stated in the filing | not stated | 47K |
| 2025-11-17 | Arnette Stephen A | Chief Operating Officer | Tax withholding | 287 | $21.49 | $6K | 47K |
| 2025-11-17 | Mullen Sean Thomas | Chief Growth Officer | Grant | 18K | $0.00 | $0 | 21K |
| 2025-11-17 | Heller John E. | Chief Executive Officer | Grant | 156K | $0.00 | $0 | 269K |
| 2025-11-17 | Bruning Jill L | Chief Technology Officer | Grant | 18K | $0.00 | $0 | 21K |
| 2025-11-17 | Burton Darren | Chief People Officer | Grant | 22K | $0.00 | $0 | 22K |
| 2025-11-17 | Johnson Travis Barton | Chief Financial Officer | Grant | 100K | $0.00 | $0 | 109K |
| 2025-11-17 | St. Mary Michele T | Chief Legal Officer & GC | Grant | 22K | $0.00 | $0 | 22K |
| 2025-11-16 | Arnette Stephen A | Chief Operating Officer | Option exercise | 5K | price not stated in the filing | not stated | 41K |
| 2025-11-16 | Arnette Stephen A | Chief Operating Officer | Option exercise | 5K | price not stated in the filing | not stated | 47K |
| 2025-11-16 | Arnette Stephen A | Chief Operating Officer | Tax withholding | 897 | $22.07 | $20K | 43K |
| 2025-11-16 | Arnette Stephen A | Chief Operating Officer | Option exercise | 4K | price not stated in the filing | not stated | 43K |
| 2025-11-16 | Arnette Stephen A | Chief Operating Officer | Tax withholding | 1K | $22.07 | $27K | 40K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON2 holders report 5% or more of AMTM in their latest filing, all on Schedule 13G (passive). The largest reported stake is Invesco Ltd. at 10.1% of the class (24,529,939 shares), filed 2026-05-07 for an event on 2026-04-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-06 | 13G | PRIMECAP MANAGEMENT CO/CA/investment adviser | 12.3M | 5.0% | 2026-06-30 |
| 2026-05-07 | 13G/Ano. 3 | Invesco Ltd.parent holding company, investment adviser | 24.5M | 10.1% | 2026-04-30 |
| 2026-03-26 | 13G/Ano. 3 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding AMTM at their latest 13F. JSON8 of the 30 tracked managers held AMTM at their latest 13F, $97.0M in total at quarter-end prices. Millennium Management is the largest at $44.0M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 6 added shares and 2 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 2.1M | $44.0M | 0.02% | +1.5M |
| Citadel Advisors | 2026-06-30 | 671K | $13.9M | 0.00% | +590K |
| Point72 Asset Management | 2026-06-30 | 650K | $13.4M | 0.01% | -981K |
| AQR Capital Management | 2026-06-30 | 602K | $12.4M | 0.00% | +94K |
| Two Sigma Investments | 2026-06-30 | 284K | $5.9M | 0.00% | -616K |
| D. E. Shaw & Co. | 2026-06-30 | 191K | $4.0M | 0.00% | +125K |
| Soros Fund Management | 2026-06-30 | 118K | $2.4M | 0.03% | +11K |
| Bridgewater Associates | 2026-06-30 | 47K | $976K | 0.00% | +30K |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Federal contracts
The largest contract actions for Amentum Holdings and its subsidiaries. JSON92 contract actions on file for AMTM: $744.2M obligated in the last 90 days and $804.8M in the last 12 months across 8 awarding agencies. The largest was $204.7M from the Department of Homeland Security on 2026-09-28 (the purpose of this contract is to provide detention, transportation and medical services at the camp east montana tempo...). This covers the largest contract actions, not every award, and agencies report late.
| Action date | Agency | Amount | Type | Description |
|---|---|---|---|---|
| 2026-10-06 | General Services AdministrationFederal Acquisition Service | $17K | new awarddelivery order | BOX,SHIPPINGUSAspending |
| 2026-10-04 | General Services AdministrationFederal Acquisition Service | $770 | new awarddelivery order | PAD,CLEANING,AIRCRAUSAspending |
| 2026-10-04 | General Services AdministrationFederal Acquisition Service | $42 | new awarddelivery order | GAGE, THICKNESS: BLADE QUANTITY: 26 OVERALL LENGTHS: 3 INCHES BLADE WIDTHS: 1/2 INCH AT BASE, TAPERED TO 1/4 INCH AT TIP BLADE THICKNESSES: .0015, .002, .0025, .003, .004, .005, .006, .007, .008, .009, .01, .011, .012, .013, .014, .015, .016, .017, .USAspending |
| 2026-10-03 | General Services AdministrationFederal Acquisition Service | $276 | new awarddelivery order | TOWEL,MACHINERY WIPUSAspending |
| 2026-10-02 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $12.4M | mod P00170definitive contract | BASE OPERATIONS AND SPACEPORT SERVICESUSAspending |
| 2026-10-02 | General Services AdministrationFederal Acquisition Service | $5K | new awarddelivery order | TAPE,PRESSURE SENSIUSAspending |
| 2026-09-30 | Department of Homeland SecurityU.S. Customs and Border Protection | $43.8M | mod P00087definitive contract | AIRCRAFT MAINTENANCE AND LOGISTICS SUPPORT SERVICES - EXERCISING OF OPTION YEAR 5 AND ISSUANCE OF OPTION YEAR INCREMENTAL FUNDS.USAspending |
| 2026-09-29 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $3.4M | new awarddelivery order | KPLSS II FY27 CUSTOMER FUNDING 80KSC026F7031USAspending |
| 2026-09-28 | Department of Homeland SecurityU.S. Immigration and Customs Enforcement | $204.7M | mod P00001definitive contract | THE PURPOSE OF THIS CONTRACT IS TO PROVIDE DETENTION, TRANSPORTATION AND MEDICAL SERVICES AT THE CAMP EAST MONTANA TEMPORARY DETENTION CENTER IN EL PASO, TX.USAspending |
| 2026-09-28 | Department of Homeland SecurityU.S. Customs and Border Protection | $5.0M | mod P00085definitive contract | CBP AIRCRAFT MAINTENANCE AND LOGISTICS SUPPORT - INCREMENTAL FUNDING FOR OPTION YEAR 4 SUPPORT AND CEILING REALIGNMENT.USAspending |
| 2026-09-28 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.5M | mod P00012delivery order | KPLSS FUNDING TASK ORDERUSAspending |
| 2026-09-28 | General Services AdministrationFederal Acquisition Service | $1.4M | mod P00066delivery order | 47QFWA23F0004 - C5ISR PITD PIF SUPPORT P00066 - INCREMENTAL FUNDING AND CLIN REALIGNMENTUSAspending |
| 2026-09-27 | General Services AdministrationFederal Acquisition Service | $28K | new awarddelivery order | INSULATION BLOCK,THUSAspending |
| 2026-09-26 | Department of StateDepartment of State | $6K | mod P00003delivery order | VENEZUELA BLS SERVICESUSAspending |
| 2026-09-25 | Department of Homeland SecurityU.S. Citizenship and Immigration Services | $16.2M | mod P00036definitive contract | APPLICATION SUPPORT CENTERS (ASC) OPS AND FACILITIES SERVICES - CONTRACTOR WILL PROVIDE, ADMINISTER, AND MANAGE ASC FACILITIES AND RELATED OPERATIONS FOR COLLECTING APPLICANT BIOMETRIC AND BIOGRAPHICAL DATA.USAspending |
| 2026-09-24 | General Services AdministrationFederal Acquisition Service | $13.1M | mod P00057delivery order | TO PROVIDE USINDOPACOM AND ITS MISSION PARTNERS WITH PROFESSIONAL SERVICES TO ADOPT AND DEVELOP INNOVATIVE TECHNOLOGY, PROCEDURAL SOLUTIONS, AND CAPABILITIES TO ADDRESS WARFIGHTER MISSION NEEDS ACROSS THE USINDOPACOM ENTERPRISE.USAspending |
| 2026-09-22 | Department of JusticeFederal Bureau of Investigation | $32.9M | mod P00008bpa call | SCOR 12- CMASUSAspending |
| 2026-09-21 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $12.6M | new awarddelivery order | CENTER MAINTENANCE, OPERATION AND ENGINEERING II (CMOE-II) SUPPORT SERVICES.USAspending |
| 2026-09-21 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.2M | mod 427delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICES FUNDING ORDER FOR COST PLUS FIXED FEE EFFORTUSAspending |
| 2026-09-21 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $900K | new awarddelivery order | CENTER MAINTENANCE, OPERATION AND ENGINEERING II (CMOE-II) SUPPORT SERVICES.USAspending |
| 2026-09-18 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $35.8M | new awarddelivery order | CENTER MAINTENANCE, OPERATION AND ENGINEERING II (CMOE-II) SUPPORT SERVICES.USAspending |
| 2026-09-18 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $6.6M | mod P00154definitive contract | ENGINEERING SERVICES AND SCIENCE CAPABILITY AUGMENTATION (ESSCA)USAspending |
| 2026-09-17 | Department of StateDepartment of State | $18.2M | new awarddelivery order | COLOMBIAN NATIONAL POLICE (CNP) AVIATION (ARAVI) SUPPORT SERVICES.USAspending |
| 2026-09-15 | Department of Homeland SecurityU.S. Citizenship and Immigration Services | $13.6M | mod P00035definitive contract | APPLICATION SUPPORT CENTERS (ASC) OPS AND FACILITIES SERVICES WILL PROVIDE, ADMINISTER AND MANAGE (ASCS) AND RELATED OPERATIONS COLLECTING APPLICANT BIOMETRIC AND BIOGRAPHICAL DATA.USAspending |
| 2026-09-15 | General Services AdministrationFederal Acquisition Service | $11.9M | mod P00065delivery order | C5ISR PITD PIF SUPPORT P00065 - INCREMENTAL FUNDING, AND REALIGNMENTUSAspending |
| 2026-09-14 | Department of JusticeFederal Bureau of Investigation | $13.4M | new awardbpa call | BACKGROUND INVESTIGATION SERVICESUSAspending |
| 2026-09-11 | Department of Homeland SecurityOffice of Procurement Operations | $5.5M | new awarddelivery order | TRADE AND ECONOMIC SECURITY SUPPORT SERVICES (CFIUS) REQUIREMENTUSAspending |
| 2026-09-10 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $3.6M | mod 426delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICES FUNDING ORDER FOR COST PLUS FIXED FEE EFFORTUSAspending |
| 2026-09-10 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $2.8M | mod 426delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICE FUNDING ORDER FOR FIXED PRICE EFFORTUSAspending |
| 2026-09-10 | Department of TransportationFederal Aviation Administration | $2.1M | new awarddelivery order | ENVIRONMENTAL REMEDIATION SUPPORT SERVICES (ERSS) - AREA Y NON-TIME CRITICAL REMOVAL ACTION - GROUNDWATERUSAspending |
| 2026-09-10 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $600K | mod 426delivery order | MAINTENANCE FUNDING FOR THE CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICE CONTRACTUSAspending |
| 2026-09-07 | General Services AdministrationFederal Acquisition Service | $575 | new awarddelivery order | DRILL SET, TWIST: IAW AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) B94.11M-1993. COMPONENT QUANTITY: 29 TYPE: JOBBERS SHANK STYLE: STRAIGHT ROUND POINT ANGLE: 118 DEGREES CONTENTS: 1 EACH FRACTIONAL SZS 1/16 TO 1/2 INCHES IN 1/64 INCH INCREMENTS.USAspending |
| 2026-09-07 | General Services AdministrationFederal Acquisition Service | $368 | new awarddelivery order | FILE SET, HAND: PATTERN TYPE: SWISS QUANTITY: 12 SET CONSISTS OF TWELVE (12) FILES: BARRETTE; EQUALING; FLAT; MARKING; JOINT; KNIFE; HALF ROUND; ROUND; SLITTING; SQUARE; THREE SQUARE AND CROSSING NEEDLE OVERALL LENGTH: 6-1/4 INCHES CUT: NO. 2 FEATUREUSAspending |
| 2026-09-07 | General Services AdministrationFederal Acquisition Service | $156 | new awarddelivery order | TAPE,PRESSURE SENSI ADHESIVE: ITEM NAME TAPE, PRESSURE SENSITIVE ADHESIVE I.A.W. SAE-AMS-T-21595 OVERALL WIDTH 0.500 INCHES OVERALL LENGTH60.00YARDS OVERALL COREDIAMETER 3.000 INCHES OVERALLTHICKNESS 0.006 INCHES COLOR TAN OVERALLMATERIAL PAPER, BASIUSAspending |
| 2026-09-07 | General Services AdministrationFederal Acquisition Service | $141 | new awarddelivery order | ABSORBENT MATERIAL,ND WATER: 15-INCH W X 20-INCH L PADS ABSORBS WATER, OILS, ACIDS/BASES,COOLANTS AND SOLVENTS. ONE HUNDRED (100) EACH, PADS PER BAG.USAspending |
| 2026-09-02 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $9.4M | mod 423delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICES FUNDING ORDER FOR COST PLUS FIXED FEE EFFORTUSAspending |
| 2026-09-02 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.4M | mod 423delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICE FUNDING ORDER FOR FIXED PRICE EFFORTUSAspending |
| 2026-08-28 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $15.1M | mod P00168definitive contract | BASE OPERATIONS AND SPACEPORT SERVICESUSAspending |
| 2026-08-27 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.1M | mod P00011delivery order | KENNEDY PROPELLANTS AND LIFE SUPPORT SERVICES II (KPLSS II) FY26 CUSTOMER FUNDING TASK ORDER (TO) 80KSC026F7005USAspending |
| 2026-08-23 | General Services AdministrationFederal Acquisition Service | $452 | new awarddelivery order | BOARD,MARKERUSAspending |
What this page is
Amentum Holdings in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Amentum Holdings (AMTM), SEC CIK 2011286, listed on NYSE. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-08.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-11.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-06.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Federal contracts
- USAspending.govSource: USAspending.gov.The largest contract actions each day, as agencies report them (up to 90 days late). Latest 2026-10-06.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-10.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-08-14.JSON and CSV
- Company record
- EDGAR filing index for CIK 2011286Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of AMTM is sold short?
12,229,137 shares were held short at the 2026-09-15 settlement, 7.3 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is AMTM's daily short volume?
On 2026-10-08, 507,925 of the 1,061,265 AMTM shares reported to FINRA were sold short, 47.9% of the day's reported volume. Short volume is a flow for one day, not a position.
Does AMTM have fails to deliver?
The SEC's latest file shows 89 AMTM shares failed to deliver at settlement 2026-09-11. Fails are reported per settlement date and published twice a month with a lag.
Are AMTM insiders buying or selling?
No open-market insider trades were reported for AMTM in the last 90 days. The most recent filings are listed below. Latest filing: Thompson Christopher M.T. (Director) on 2026-08-14.
Who owns 5% or more of AMTM?
2 holders report 5% or more of AMTM in their latest filing, all on Schedule 13G (passive). The largest reported stake is Invesco Ltd. at 10.1% of the class (24,529,939 shares), filed 2026-05-07 for an event on 2026-04-30.
Which tracked 13F managers own AMTM?
8 of the 30 tracked 13F managers held AMTM shares at their latest filing, $97.0M in all. The largest: Izzy Englander's Millennium Management (2.1M shares, $44.0M), Ken Griffin's Citadel Advisors (671K shares, $13.9M), Steve Cohen's Point72 Asset Management (650K shares, $13.4M), Cliff Asness's AQR Capital Management (602K shares, $12.4M), Two Sigma Investments (284K shares, $5.9M), D. E. Shaw & Co. (191K shares, $4.0M). The table above lists all 8.
How much federal contract money did AMTM receive?
$744.2M was obligated to Amentum Holdings and its subsidiaries in the last 90 days and $804.8M in the last 12 months, counting the largest contract actions on USAspending, not every award. Obligations are not revenue; they are spent over each contract's life.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.