Amentum Ownership | Who Owns Amentum?
Amentum Ownership Summary
Amentum is owned by 72.08% institutional investors, 1.17% insiders, and 26.75% retail investors. American securities is the largest institutional shareholder, holding 18.45% of AMTM shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 3.84% of its assets in Amentum shares.
AMTM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Amentum | 72.08% | 1.17% | 26.75% |
| Sector | Industrials Stocks | 67.86% | 16.45% | 15.69% |
| Industry | Defense Stocks | 68.52% | 12.74% | 18.74% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| American securities | 45.03M | 18.45% | $1.17B |
| Invesco | 24.95M | 10.23% | $515.80M |
| Blackrock funding, inc. /de | 17.91M | 7.34% | $370.14M |
| Vanguard group | 15.41M | 6.34% | $446.94M |
| Primecap management co/ca/ | 12.29M | 5.04% | $253.94M |
| Legacy advisors | 9.07M | 3.72% | $9.07M |
| Vanguard capital management | 6.71M | 2.75% | $138.74M |
| Fmr | 5.68M | 2.33% | $117.39M |
| Dimensional fund advisors lp | 5.54M | 2.27% | $114.46M |
| State street | 5.15M | 2.11% | $106.49M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| American securities | 45.03M | 29.88% | $1.17B |
| Segra capital management | 2.04M | 8.50% | $42.12M |
| Troluce capital advisors | 3.57M | 7.59% | $73.70M |
| Grizzlyrock capital | 318.36K | 4.60% | $6.58M |
| Lingohr & partner asset management gmbh | 175.00K | 4.19% | $4.19M |
| Awh capital | 235.25K | 3.41% | $4.86M |
| Permian investment partners, lp | 1.43M | 3.25% | $29.62M |
| Avenir | 811.73K | 2.04% | $16.78M |
| Discovery capital management, llc / ct | 1.14M | 1.50% | $27.28M |
| Soviero asset management, lp | 150.00K | 1.30% | $3.10M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Invesco | 24.95M | 0.04% | 3.48M |
| Troluce capital advisors | 3.57M | 7.59% | 2.57M |
| Sixth street partners management company | 2.12M | 0.01% | 2.12M |
| Dimensional fund advisors lp | 5.54M | 0.02% | 1.75M |
| Goldman sachs group | 2.71M | 0.00% | 1.58M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Colony group | 138.34K | 0.00% | -2.47M |
| Allspring global investments | - | - | -2.42M |
| Arvin capital management lp | 416.70K | 1.12% | -1.65M |
| Toronto dominion bank | - | - | -1.57M |
| Brightline capital management | - | - | -1.40M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Sixth street partners management company | 2.12M | 0.01% | 2.12M | $43.82M |
| Norges bank | 1.52M | 0.00% | 1.52M | $31.34M |
| Hrt financial lp | 671.85K | 0.03% | 671.85K | $13.89M |
| Loews | 500.00K | 0.08% | 500.00K | $10.34M |
| Shapiro capital management | 475.97K | 0.60% | 475.97K | $9.84M |
Sold Out
| Holder | Change |
|---|---|
| Lloyd advisory services, llc. | -1.00 |
| Scarborough advisors | -1.00 |
| Kingdom financial group llc. | -1.00 |
| Pacer advisors | -1.00 |
| Tfc financial management | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 479 | -6.63% | 175,875,437 | -16.65% | 72 | 0.96% | 208 | -6.31% | 156 | 2.63% |
| Mar 31, 2026 | 374 | -25.05% | 155,700,685 | -23.60% | 63 | 0.91% | 156 | -30.04% | 106 | -33.33% |
| Dec 31, 2025 | 390 | -17.55% | 149,695,819 | -22.64% | 61 | 0.97% | 163 | -6.86% | 128 | -30.43% |
| Sep 30, 2025 | 454 | -4.62% | 193,141,676 | -3.57% | 79 | 1.17% | 168 | -51.59% | 176 | 76.00% |
| Jun 30, 2025 | 465 | 7.64% | 198,595,810 | 6.58% | 81 | 1.39% | 337 | 79.26% | 99 | -31.25% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 9.37M | 3.84% | -7.20K |
| Vanguard PRIMECAP Core Inv | 5.52M | 2.26% | 246.68K |
| Vanguard MStar Total Stk Mkt Idx Invest | 4.67M | 1.91% | 17.50K |
| Vanguard Total Stock Mkt Idx Inv | 4.65M | 1.91% | -15.14K |
| Vanguard Morn Total Stk Mkt Idx Investor | 4.65M | 1.91% | -15.14K |
| Invesco Small Cap Value A | 4.23M | 1.73% | - |
| Vanguard Small Cap Index | 3.37M | 1.38% | 5.54K |
| Invesco Value Opportunities A | 2.95M | 1.21% | - |
| Vanguard Capital Opportunity Inv | 2.51M | 1.03% | -77.69K |
| Fidelity Value | 2.38M | 0.97% | - |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Feb 18, 2025 | Loughran Barbara | - | Buy | $97.64K |
| Feb 12, 2025 | DEMETRIOU STEVEN J. | Executive Chair | Buy | $2.08M |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | - |
| 2026 Q1 | - | - |
| 2025 Q4 | - | - |
| 2025 Q2 | - | - |
| 2025 Q1 | 2 | - |
AMTM Ownership FAQ
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