AMTM · Amentum Holdings, Inc. · Holdings
Market Cap
$4.85B
Shares
244.51M
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 465
Total Value: $4,581,809,160
Total Shares: 221,903,738
Showing 1–100
of 483 holdings by value
· page 1 of 5
Institutional Ownership Trend
8 quarters
Holder Concentration
Across 465 13F filers · Δ vs Mar 31, 2026Top Holder
20.3%
−1.4 pts
Top 5
49.3%
−1.1 pts
Top 10
63.3%
+0.4 pts
HHI
718
Broadly held−40
Quarterly Activity
vs Mar 31, 2026
New
59
Increased
144
Decreased
164
Sold Out
85
Unchanged
98
Holder count:
-26
Institutional value:
-15.2%
Shares held:
+2.8%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega Invesco Ltd. | +3,480,473 | 24,954,251 | |
| Small Troluce Capital Advisors LLC | +2,565,399 | 3,565,399 | |
| Mega DIMENSIONAL FUND ADVISORS LP | +1,750,276 | 5,537,696 | |
| Mega GOLDMAN SACHS GROUP INC | +1,580,428 | 2,711,866 | |
| Mega MILLENNIUM MANAGEMENT LLC | +1,496,724 | 2,127,779 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Large Focus Partners Wealth | −2,466,567 | 138,344 | |
| Small Arvin Capital Management LP | −1,950,995 | 866,705 | |
| Mid Ruane, Cunniff & Goldfarb L.P. | −1,085,769 | 537,213 | |
| Large Point72 Asset Management, L.P. | −980,579 | 649,984 | |
| Large Caption Management, LLC | −818,822 | 614,000 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega NORGES BANK | 1,516,193 | $31,339,709 | |
| Large HRT FINANCIAL LP | 671,847 | $13,887,077 | |
| Large Loews Corp | 500,000 | $10,335,000 | |
| Mid SHAPIRO CAPITAL MANAGEMENT LLC | 475,970 | $9,838,299 | |
| Large ExodusPoint Capital Management, LP | 226,289 | $4,677,393 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Large TORONTO DOMINION BANK | 1,565,223 | $40,821,015 | |
| Small BRIGHTLINE CAPITAL MANAGEMENT, LLC | 1,396,000 | $36,407,680 | |
| Mid COOPER CREEK PARTNERS MANAGEMENT LLC | 929,334 | $24,237,030 | |
| Mid Penn Capital Management Company, LLC | 694,352 | $18,108,700 | |
| Large CI INVESTMENTS INC. | 420,068 | $10,955,373 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mid AMERICAN SECURITIES LLC Broker-Dealer | $930,702,777 | 20.31% | 45,026,743 | Shares | 2026-08-26 | |
| Mega Invesco Ltd. | $515,804,364 | 11.26% | 24,954,251 | Shares | 2026-08-14 | |
| Mega BlackRock, Inc. | $370,137,353 | 8.08% | 17,906,984 | Shares | 2026-08-07 | |
| Mega PRIMECAP MANAGEMENT CO/CA/ | $253,941,367 | 5.54% | 12,285,504 | Shares | 2026-08-14 | |
| Small Legacy Advisors, LLC | $187,387,543 | 4.09% | 9,065,677 | Shares | 2026-07-24 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC | $164,293,117 | 3.59% | 7,948,385 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $138,736,771 | 3.03% | 6,711,987 | Shares | 2026-08-13 | |
| Mega FMR LLC | $117,388,544 | 2.56% | 5,679,175 | Shares | 2026-08-13 | |
| Mega DIMENSIONAL FUND ADVISORS LP | $114,464,174 | 2.50% | 5,537,696 | Shares | 2026-08-11 | |
| Mega STATE STREET CORP | $106,487,127 | 2.32% | 5,151,772 | Shares | 2026-08-07 | |
| Large FRONTIER CAPITAL MANAGEMENT CO LLC | $85,655,880 | 1.87% | 4,143,971 | Shares | 2026-08-14 | |
| Small Troluce Capital Advisors LLC | $73,696,797 | 1.61% | 3,565,399 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | $56,151,294 | 1.23% | 2,716,560 | Shares | 2026-08-12 | |
| Mega GOLDMAN SACHS GROUP INC | $56,054,269 | 1.22% | 2,711,866 | Shares | 2026-08-14 | |
| Mega MORGAN STANLEY | $55,030,336 | 1.20% | 2,662,329 | Shares | 2026-08-13 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund | $47,925,069 | 1.05% | 2,318,581 | Shares | 2026-08-14 | |
| Mid THOMPSON SIEGEL & WALMSLEY LLC | $47,167,803 | 1.03% | 2,281,945 | Shares | 2026-08-11 | |
| Mega MILLENNIUM MANAGEMENT LLC | $43,981,191 | 0.96% | 2,127,779 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $43,822,508 | 0.96% | 2,120,102 | Shares | 2026-08-14 | |
| Large Thrivent Financial for Lutherans | $43,526,926 | 0.95% | 2,105,802 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $42,226,679 | 0.92% | 2,042,897 | Shares | 2026-08-14 | |
| Small SEGRA CAPITAL MANAGEMENT, LLC | $42,123,186 | 0.92% | 2,037,890 | Shares | 2026-08-12 | |
| Large Verition Fund Management LLC | $41,739,633 | 0.91% | 2,019,334 | Shares | 2026-08-14 | |
| Mega VAN ECK ASSOCIATES CORP | $41,110,521 | 0.90% | 1,988,898 | Shares | 2026-08-14 | |
| Large VOYA INVESTMENT MANAGEMENT LLC | $40,806,527 | 0.89% | 1,974,191 | Shares | 2026-08-12 | |
| Mega UBS Group AG | $31,938,931 | 0.70% | 1,545,183 | Shares | 2026-08-13 | |
| Mega NORGES BANK Bank | $31,339,709 | 0.68% | 1,516,193 | Shares | 2026-08-12 | |
| Small Permian Investment Partners, LP | $29,620,688 | 0.65% | 1,433,028 | Shares | 2026-08-14 | |
| Mid 683 Capital Management, LLC | $22,737,000 | 0.50% | 1,100,000 | Shares | 2026-08-14 | |
| Large LOOMIS SAYLES & CO L P | $21,548,929 | 0.47% | 1,042,522 | Shares | 2026-08-14 | |
| Mega Qube Research & Technologies Ltd | $21,380,944 | 0.47% | 1,034,395 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $21,287,865 | 0.46% | 1,029,892 | Shares | 2026-08-13 | |
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $20,017,882 | 0.44% | 968,451 | Shares | 2026-08-13 | |
| Mega Bank of New York Mellon Corp Bank | $18,149,990 | 0.40% | 878,084 | Shares | 2026-08-06 | |
| Mid CACTI ASSET MANAGEMENT LLC | $17,836,629 | 0.39% | 881,692 | Shares | 2026-07-01 | |
| Mega Russell Investments Group, Ltd. | $17,376,067 | 0.38% | 840,642 | Shares | 2026-08-06 | |
| Small AVENIR CORP | $16,778,376 | 0.37% | 811,726 | Shares | 2026-08-13 | |
| Mega WELLS FARGO & COMPANY/MN | $15,506,920 | 0.34% | 750,214 | Shares | 2026-08-14 | |
| Mega PRINCIPAL FINANCIAL GROUP INC | $15,345,014 | 0.33% | 742,381 | Shares | 2026-08-04 | |
| Mid Ancora Advisors LLC | $14,792,526 | 0.32% | 715,652 | Shares | 2026-08-14 | |
| Large ROYCE & ASSOCIATES LP | $14,414,596 | 0.31% | 697,368 | Shares | 2026-08-14 | |
| Large HRT FINANCIAL LP | $13,887,077 | 0.30% | 671,847 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $13,863,038 | 0.30% | 670,684 | Shares | 2026-09-02 | |
| Large Point72 Asset Management, L.P. | $13,435,169 | 0.29% | 649,984 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC | $12,441,270 | 0.27% | 601,900 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP | $11,325,237 | 0.25% | 547,907 | Shares | 2026-08-11 | |
| Mid Ruane, Cunniff & Goldfarb L.P. | $11,104,192 | 0.24% | 537,213 | Shares | 2026-08-14 | |
| Large Public Sector Pension Investment Board Pension | $10,930,730 | 0.24% | 528,821 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $10,676,055 | 0.23% | 516,500 | Put | 2026-08-14 | |
| Large Caption Management, LLC | $10,335,000 | 0.23% | 500,000 | Call | 2026-08-14 | |
| Large Loews Corp | $10,335,000 | 0.23% | 500,000 | Shares | 2026-08-14 | |
| Mid FIRST NATIONAL BANK OF OMAHA Bank | $9,838,753 | 0.21% | 475,992 | Shares | 2026-08-07 | |
| Mid SHAPIRO CAPITAL MANAGEMENT LLC | $9,838,299 | 0.21% | 475,970 | Shares | 2026-08-06 | |
| Small Arvin Capital Management LP | $9,301,500 | 0.20% | 450,000 | Call | 2026-08-13 | |
| Mega Nuveen, LLC | $8,712,300 | 0.19% | 421,495 | Shares | 2026-08-11 | |
| Small Arvin Capital Management LP | $8,613,292 | 0.19% | 416,705 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $8,445,762 | 0.18% | 408,600 | Call | 2026-08-14 | |
| Large HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | $8,312,027 | 0.18% | 402,130 | Shares | 2026-08-14 | |
| Mid SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | $8,151,627 | 0.18% | 394,370 | Shares | 2026-08-14 | |
| Mid BOOTHBAY FUND MANAGEMENT, LLC | $8,019,401 | 0.18% | 387,973 | Shares | 2026-08-14 | |
| Small De Lisle Partners LLP | $7,747,488 | 0.17% | 374,818 | Shares | 2026-08-12 | |
| Large Vident Advisory, LLC | $7,708,214 | 0.17% | 372,918 | Shares | 2026-08-12 | |
| Large Mawer Investment Management Ltd. | $7,638,743 | 0.17% | 369,557 | Shares | 2026-08-07 | |
| Mid MOORE CAPITAL MANAGEMENT, LP | $7,546,534 | 0.16% | 365,096 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $7,214,821 | 0.16% | 349,048 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $7,104,009 | 0.16% | 343,687 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $6,871,782 | 0.15% | 332,452 | Shares | 2026-08-14 | |
| Mid CenterBook Partners LP | $6,795,593 | 0.15% | 328,766 | Shares | 2026-08-11 | |
| Mega AMERIPRISE FINANCIAL INC | $6,603,629 | 0.14% | 319,479 | Shares | 2026-08-14 | |
| Small GRIZZLYROCK CAPITAL, LLC | $6,580,563 | 0.14% | 318,363 | Shares | 2026-08-14 | |
| Mega Swiss National Bank Bank | $6,574,940 | 0.14% | 318,091 | Shares | 2026-08-11 | |
| Mid Rovida Investment Management Ltd | $6,511,050 | 0.14% | 315,000 | Shares | 2026-08-05 | |
| Mid Aristotle Capital Boston, LLC | $6,362,970 | 0.14% | 307,836 | Shares | 2026-08-14 | |
| Large EXCHANGE TRADED CONCEPTS, LLC | $6,310,260 | 0.14% | 305,286 | Shares | 2026-08-11 | |
| Mega TWO SIGMA INVESTMENTS, LP | $5,875,819 | 0.13% | 284,268 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS | $5,871,520 | 0.13% | 284,060 | Shares | 2026-08-12 | |
| Large FIFTH THIRD BANCORP Bank | $5,825,116 | 0.13% | 281,815 | Shares | 2026-08-05 | |
| Mega California Public Employees Retirement System Pension | $5,506,136 | 0.12% | 266,383 | Shares | 2026-08-14 | |
| Mega SG Americas Securities, LLC Broker-Dealer | $5,436,065 | 0.12% | 262,993 | Shares | 2026-08-07 | |
| Small Hudson Value Partners, LLC | $5,171,323 | 0.11% | 250,185 | Shares | 2026-07-10 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $5,161,814 | 0.11% | 249,725 | Shares | 2026-08-13 | |
| Mid CSM Advisors, LLC | $5,039,635 | 0.11% | 243,814 | Shares | 2026-08-14 | |
| Small AWH Capital, L.P. | $4,862,617 | 0.11% | 235,250 | Shares | 2026-08-17 | |
| Large ExodusPoint Capital Management, LP | $4,677,393 | 0.10% | 226,289 | Shares | 2026-08-14 | |
| Mega RAYMOND JAMES FINANCIAL INC | $4,638,326 | 0.10% | 224,399 | Shares | 2026-08-14 | |
| Small Hel Ved Capital Management Ltd | $4,423,380 | 0.10% | 214,000 | Shares | 2026-08-14 | |
| Small SEGRA CAPITAL MANAGEMENT, LLC | $4,134,000 | 0.09% | 200,000 | Call | 2026-08-12 | |
| Mega CITADEL ADVISORS LLC | $3,976,908 | 0.09% | 192,400 | Put | 2026-09-02 | |
| Mega D. E. Shaw & Co., Inc. | $3,958,056 | 0.09% | 191,488 | Shares | 2026-08-14 | |
| Large SEI INVESTMENTS CO | $3,928,726 | 0.09% | 190,069 | Shares | 2026-08-14 | |
| Mid WEDGE CAPITAL MANAGEMENT L L P/NC | $3,882,487 | 0.08% | 187,832 | Shares | 2026-07-10 | |
| Small Verbena Value LP | $3,848,754 | 0.08% | 186,200 | Shares | 2026-08-14 | |
| Small Telos Capital Management, Inc. | $3,836,579 | 0.08% | 185,611 | Shares | 2026-07-22 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension | $3,787,219 | 0.08% | 183,223 | Shares | 2026-08-24 | |
| Small Soviero Asset Management, LP | $3,720,600 | 0.08% | 180,000 | Call | 2026-08-14 | |
| Small North Growth Management Ltd. | $3,575,910 | 0.08% | 173,000 | Shares | 2026-07-22 | |
| Mid OpenArc Corporate Advisory, LLC | $3,519,914 | 0.08% | 170,291 | Shares | 2026-08-05 | |
| Mid Brevan Howard Capital Management LP | $3,459,207 | 0.08% | 167,354 | Shares | 2026-08-14 | |
| Large NEW YORK STATE TEACHERS RETIREMENT SYSTEM Pension | $3,348,374 | 0.07% | 161,992 | Shares | 2026-07-23 | |
| Mid Atom Investors LP | $3,325,306 | 0.07% | 160,876 | Shares | 2026-08-14 |
Key facts
CIK
2011286
CUSIP
023939101
13F (30d)
222 filings
221 filers
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