Amentum Holdings, Inc. (AMTM)
Every FINRA and SEC series the site collects for Amentum Holdings, Inc.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on NYSE.
10.7M
Short interest
settlement 2026-08-14
4.2
Days to cover
-14.0% vs prior
60.0%
Short share of volume
2026-09-11
166
Fails to deliver
settlement 2026-08-13
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-09-11.
Short interest
FINRA, twice a month; the last 12 months shown, all 46 settlements in the JSONAs of 14 August 2026, short interest in AMTM is 10,651,434 shares, down 2,802,264 shares over the last month. Over the last 46 readings it ranged from 376,113 shares (30 September 2024) to 13,878,459 shares (15 May 2026). At the reported average volume of 2.5M shares a day that is 4.2 days to cover.
Embed this chartfree, with the attribution line it carries
<iframe src="https://xoomar.com/embed/stocks/amtm" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 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 |
| 2025-09-15 | 8,548,141 | -7.7% | 1,400,632 | 6.10 |
| 2025-08-29 | 9,263,705 | +14.2% | 1,245,743 | 7.44 |
Daily short volume
FINRA Reg SHO, last 60 sessions. JSONAs of 11 September 2026, the short share of AMTM volume is 60.0%, up 21.6 points over the last five sessions. Over the last 52 readings it ranged from 19.4% (18 August 2026) to 71.5% (27 July 2026). The latest reading is 11.4 points above the 30-session average of 48.7%, on 341K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 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 |
| 2026-08-26 | 265K | 594K | 44.6% | 12 |
| 2026-08-25 | 429K | 749K | 57.3% | 0 |
| 2026-08-24 | 502K | 1.0M | 49.8% | 0 |
| 2026-08-21 | 480K | 1.2M | 39.8% | 200 |
| 2026-08-20 | 536K | 1.4M | 38.3% | 1,399 |
| 2026-08-19 | 395K | 882K | 44.8% | 526 |
| 2026-08-18 | 413K | 2.1M | 19.4% | 1,140 |
| 2026-08-17 | 624K | 1.7M | 36.1% | 11,299 |
| 2026-08-14 | 313K | 558K | 56.1% | 77 |
| 2026-08-13 | 443K | 813K | 54.5% | 778 |
| 2026-08-12 | 665K | 1.5M | 44.8% | 25,029 |
| 2026-08-11 | 1.6M | 2.8M | 58.5% | 71,031 |
| 2026-08-10 | 601K | 1.2M | 50.6% | 675 |
| 2026-08-07 | 420K | 781K | 53.8% | 506 |
| 2026-08-06 | 298K | 773K | 38.6% | 66 |
| 2026-08-05 | 170K | 394K | 43.1% | 326 |
| 2026-08-04 | 262K | 602K | 43.5% | 146 |
| 2026-08-03 | 317K | 504K | 62.9% | 453 |
| 2026-07-31 | 325K | 557K | 58.4% | 100 |
Fails to deliver
SEC, by settlement date. JSONAs of 13 August 2026, the fails-to-deliver balance in AMTM is 166 shares, down 443 shares over the last settlement date. Over the last 52 readings it ranged from 12 shares (17 July 2026) to 67,649 shares (6 March 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 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 |
| 2026-04-29 | 3,873 | $25.90 | $100K |
| 2026-04-20 | 100 | $27.58 | $3K |
| 2026-04-15 | 117 | $27.48 | $3K |
| 2026-04-14 | 617 | $27.57 | $17K |
| 2026-04-10 | 11,301 | $26.53 | $300K |
| 2026-04-09 | 10,542 | $27.15 | $286K |
| 2026-04-07 | 200 | $27.06 | $5K |
| 2026-04-02 | 27 | $26.34 | $711 |
| 2026-03-31 | 381 | $25.17 | $10K |
| 2026-03-27 | 100 | $26.54 | $3K |
| 2026-03-25 | 201 | $26.59 | $5K |
| 2026-03-19 | 25 | $27.07 | $677 |
| 2026-03-18 | 33,792 | $27.65 | $934K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for AMTM in the last 90 days. The most recent filings are listed below; grants and option exercises carry a weaker signal than voluntary trades. Latest filing: Bruning Jill L (Chief Technology Officer) on 2026-03-04.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-03-04 | Bruning Jill L | Chief Technology Officer | Gift | 30K | $0.00 | $0 | 191K |
| 2026-02-06 | IRELAND SUSAN LESLIE | n/a | Grant | 5K | $0.00 | $0 | 9K |
| 2026-02-06 | Loughran Barbara | n/a | Grant | 5K | $0.00 | $0 | 10K |
| 2026-02-06 | Thompson Christopher M.T. | n/a | Grant | 5K | $0.00 | $0 | 5K |
| 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 |
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 the rarer, stronger signal.
Large holders (13D and 13G)
One row per reporting person, newest filing first. JSON1 holder above 5% has filed on AMTM, all on Schedule 13G (passive). The largest reported stake is PRIMECAP MANAGEMENT CO/CA/ at 5.0% of the class (12,285,504 shares), filed 2026-08-06 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-06 | 13G | PRIMECAP MANAGEMENT CO/CA/investment adviser | 12.3M | 5.0% | 2026-06-30 |
13F holders
Tracked managers holding AMTM at their latest 13F. JSON8 of the 30 tracked managers held AMTM at their latest 13F, $103.2M 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% | +2.1M |
| Citadel Advisors | 2026-06-30 | 974K | $20.1M | 0.00% | +467K |
| 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% | -644K |
| 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
Largest actions mapped to Amentum Holdings, Inc. and its subsidiaries. JSON64 contract actions on file for AMTM: $334.0M obligated in the last 90 days and $334.0M in the last 12 months across 7 awarding agencies. The largest was $41.1M from the Department of Homeland Security on 2026-08-06 (cbp aircraft maintenance and logistics support - incremental funding for option year 4 support.). Only actions large enough to reach the daily top list are counted, and agencies report with a lag.
| Action date | Agency | Amount | Type | Description |
|---|---|---|---|---|
| 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 |
| 2026-08-23 | General Services AdministrationFederal Acquisition Service | $237 | new awarddelivery order | MEMO BOOKUSAspending |
| 2026-08-21 | General Services AdministrationFederal Acquisition Service | $2.9M | mod P00064delivery order | 47QFWA23F0004 - C5ISR PITD PIF SUPPORT P00064 - OY2 - OY3 REALIGNMENT, OY2 DEOBLIGATION, OY3 INCREMENTAL FUNDINGUSAspending |
| 2026-08-20 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $2.9M | mod 230definitive contract | AMES FACILITIES SUPPORT SERVICES (AFSS)USAspending |
| 2026-08-20 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $648K | mod P00005delivery order | AEROSPACE TESTING AND FACILITIES OPERATIONS AND MAINTENANCE (ATOM-5) THE PRINCIPAL PURPOSE OF THIS CONTRACT IS TO ACQUIRE SUPPORT SERVICES FOR THE ARC GROUNDS-BASED AEROSPACE TEST FACILITIES.USAspending |
| 2026-08-19 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $500K | new awarddelivery order | TASK ORDER FOR FACILITIES OPERATIONS MAINTENANCE SUPPORT SERVICES (FOMSS) - SCHEDULED MAINTENANCE OPTION PERIOD - 10USAspending |
| 2026-08-18 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $18.8M | mod P00151definitive contract | ENGINEERING SERVICES AND SCIENCE CAPABILITY AUGMENTATION (ESSCA)USAspending |
| 2026-08-17 | General Services AdministrationFederal Acquisition Service | $16.4M | mod P00055delivery 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 |
| 2026-08-12 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.8M | mod 420delivery order | OPERATIONS FUNDING FOR THE CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICE CONTRACTUSAspending |
| 2026-08-12 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.6M | mod 420delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICES FUNDING ORDER FOR COST PLUS FIXED FEE EFFORTUSAspending |
| 2026-08-06 | Department of Homeland SecurityU.S. Customs and Border Protection | $41.1M | mod P00083definitive contract | CBP AIRCRAFT MAINTENANCE AND LOGISTICS SUPPORT - INCREMENTAL FUNDING FOR OPTION YEAR 4 SUPPORT.USAspending |
| 2026-08-04 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $5.8M | mod P00167definitive contract | BASE OPERATIONS AND SPACEPORT SERVICESUSAspending |
| 2026-08-03 | General Services AdministrationFederal Acquisition Service | $5.4M | mod P00054delivery 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 |
| 2026-07-30 | n/a | $8.2M | new awardbpa call | ANALYTICAL MISSION SUPPORTUSAspending |
| 2026-07-30 | Department of the TreasuryDepartmental Offices | $5.3M | mod P00003delivery order | MODIFICATION P00003 INCREASES THE TCVUSAspending |
| 2026-07-29 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $17.7M | mod P00166definitive contract | BASE OPERATIONS AND SPACEPORT SERVICESUSAspending |
| 2026-07-29 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $9.7M | mod 417delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICES FUNDING ORDER FOR COST PLUS FIXED FEE EFFORTUSAspending |
| 2026-07-29 | Department of TransportationFederal Aviation Administration | $4.4M | new awarddelivery order | ERSS - CLIN 0001: AREA 56 NON-TIME CRITICAL REMOVAL ACTION LANDFILL WASTE REMOVALUSAspending |
| 2026-07-29 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $2.0M | mod 417delivery order | OPERATIONS FUNDING FOR THE CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICE CONTRACTUSAspending |
| 2026-07-29 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.9M | mod 417delivery order | MAINTENANCE FUNDING FOR THE CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICE CONTRACTUSAspending |
| 2026-07-29 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.4M | mod 417delivery order | CENTER MAINTENANCE, OPERATIONS, AND ENGINEERING (CMOE) SUPPORT SERVICE FUNDING ORDER FOR FIXED PRICE EFFORTUSAspending |
| 2026-07-29 | Department of TransportationFederal Aviation Administration | $461K | mod P00001delivery order | ERSS YEAR 6 CLIN 0003 GROUNDWATER TREATMENT PLANT OPERATIONS AND MAINTENANCE - FUNDINGUSAspending |
| 2026-07-28 | Department of Health and Human ServicesOffice of the Assistant Secretary for Financial Resources | $1.7M | new awarddelivery order | OBTAIN SERVICES FROM QUALIFIED CONTRACTOR WITH THE KNOWLEDGE, SKILLS, AND ABILITIES TO OPERATE AND MAINTAIN (O&M) PSC'S TWO LOW-CODE APPLICATION PLATFORMS (LCAPS), WHICH ARE CURRENTLY IN PRODUCTION AND FEDERAL RISK AND AUTHORIZATION MANAGEMEUSAspending |
| 2026-07-23 | General Services AdministrationFederal Acquisition Service | $3.5M | mod P00062delivery order | C5ISR PITD PIF SUPPORT P00062 - EXERCISE OY3USAspending |
| 2026-07-22 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $1.2M | mod P00003delivery order | AEROSPACE TESTING AND FACILITIES OPERATIONS AND MAINTENANCE (ATOM-5) THE PRINCIPAL PURPOSE OF THIS CONTRACT IS TO ACQUIRE SUPPORT SERVICES FOR THE ARC GROUNDS-BASED AEROSPACE TEST FACILITIES.USAspending |
| 2026-07-21 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $480K | mod P00033delivery order | FILMSS 2 CODE S IDIQ TASK ORDER: TO PROVIDE PROGRAM, SCIENCE, ENGINEERING, OPERATIONS AND PROJECT MANAGEMENT SUPPORT FOR BIOSCIENCES FLIGHT DEVELOPMENT PROJECTS AND COLLABORATIVE SCIENCE PROGRAMS.USAspending |
| 2026-07-20 | National Aeronautics and Space AdministrationNational Aeronautics and Space Administration | $36.0M | mod P00150definitive contract | ENGINEERING SERVICES AND SCIENCE CAPABILITY AUGMENTATION (ESSCA)USAspending |
| 2026-07-16 | Department of TransportationFederal Aviation Administration | $15.2M | new awarddelivery order | PERFORM THE NON-TIME CRITICAL REMOVAL ACTION TO ADDRESS A SOURCE AREA AT THE FAA WILLIAM J HUGHES TECHNICAL CENTER SUPERFUND AREA 41 (AVGAS FUEL FARM AND PHOTO LAB) UNDERGROUND STORAGE TANK (UST) AREAUSAspending |
What this page is
Amentum Holdings, Inc. 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 pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, 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 summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.
This page follows Amentum Holdings, Inc. (AMTM), SEC CIK 2011286, listed on NYSE. The cross-market tables live on the short interest and insider transactions hubs.
Source and method
- Short interest
- FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-14.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-13.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-08-06.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Federal contracts
- USAspending.govDaily read of the largest actions per day; agencies report with up to a 90-day lag. Latest 2026-09-10.JSON and CSV
- Insider trades
- SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-03-04.JSON and CSV
- Company record
- EDGAR filing index for CIK 2011286Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 30 requests a minute without a key, 120 a minute with a key from a free account.
Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 13 Sep 05:40 UTC.
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 crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short 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?
10,651,434 shares were held short at the 2026-08-14 settlement, 4.2 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 2026-09-11, 204,665 of the 340,885 AMTM shares reported to FINRA were sold short, 60.0% 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 166 AMTM shares failed to deliver at settlement 2026-08-13. 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; grants and option exercises carry a weaker signal than voluntary trades. Latest filing: Bruning Jill L (Chief Technology Officer) on 2026-03-04.
Who owns more than 5% of AMTM?
1 holder above 5% has filed on AMTM, all on Schedule 13G (passive). The largest reported stake is PRIMECAP MANAGEMENT CO/CA/ at 5.0% of the class (12,285,504 shares), filed 2026-08-06 for an event on 2026-06-30.
Which funds hold AMTM?
8 of the 30 tracked managers held AMTM at their latest 13F, $103.2M 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.
How much federal contract money did AMTM receive?
$334.0M was obligated to Amentum Holdings, Inc. and its mapped subsidiaries in the last 90 days and $334.0M in the last 12 months, counting only the largest daily actions on USAspending. 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.