Amentum Ownership | Who Owns Amentum?
Amentum Ownership Summary
Amentum is owned by 61.60% institutional investors, 2.14% insiders, and 36.25% retail investors. American securities is the largest institutional shareholder, holding 18.53% of AMTM shares.
AMTM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Amentum | 61.60% | 2.14% | 36.25% |
| Sector | Industrials Stocks | 47.66% | 12.52% | 39.82% |
| Industry | Defense Stocks | 48.36% | 10.81% | 40.83% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| American securities | 45.03M | 18.53% | $1.31B |
| Invesco | 22.12M | 9.10% | $529.70M |
| Blackrock funding, inc. /de | 17.46M | 7.18% | $506.31M |
| Vanguard group | 15.41M | 6.34% | $446.94M |
| Primecap management co/ca/ | 12.13M | 4.99% | $351.68M |
| Legacy advisors | 9.81M | 4.04% | $9.81M |
| State street | 6.83M | 2.81% | $163.66M |
| Fmr | 6.24M | 2.57% | $149.33M |
| Frontier capital management | 5.20M | 2.14% | $124.60M |
| Kovitz investment group partners | 3.01M | 1.24% | $72.04M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| American securities | 45.03M | 100.00% | $1.31B |
| Brightline capital management | 1.20M | 11.78% | $28.74M |
| Arvin capital management lp | 1.64M | 7.08% | $39.19M |
| Hyperion capital advisors lp | 491.87K | 6.98% | $14.26M |
| Awh capital | 235.25K | 5.88% | $5.63M |
| Grizzlyrock capital | 283.11K | 5.27% | $6.78M |
| Lingohr & partner asset management gmbh | 175.00K | 4.19% | $4.19M |
| Segra capital management | 417.02K | 4.04% | $9.99M |
| Avenir | 862.45K | 2.15% | $20.66M |
| Soviero asset management, lp | 155.00K | 1.93% | $3.71M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Legacy advisors | 9.81M | 1.05% | 9.81M |
| Invesco | 22.12M | 0.08% | 2.54M |
| Norges bank | 2.29M | 0.01% | 2.29M |
| Fmr | 6.24M | 0.01% | 1.66M |
| Point72 asset management | 1.38M | 0.06% | 1.03M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Allspring global investments | - | - | -2.42M |
| Van eck associates | 765.68K | 0.02% | -2.30M |
| Balyasny asset management | - | - | -1.88M |
| Cooper creek partners management | - | - | -1.22M |
| Discovery capital management, llc / ct | 1.14M | 1.50% | -1.16M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Legacy advisors | 9.81M | 1.05% | 9.81M | $9.81M |
| Norges bank | 2.29M | 0.01% | 2.29M | $66.53M |
| Segra capital management | 417.02K | 4.04% | 417.02K | $9.99M |
| Hotchkis & wiley capital management | 268.13K | 0.02% | 268.13K | $6.42M |
| Trexquant investment lp | 255.75K | 0.06% | 255.75K | $6.13M |
Sold Out
| Holder | Change |
|---|---|
| Dynamic wealth strategies | -1.00 |
| Activest wealth management | -1.00 |
| Tfc financial management | -1.00 |
| Pacer advisors | -1.00 |
| Wpg advisers | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Mar 31, 2025 | 431 | -5.48% | 189,528,097 | 11.36% | 77 | 1.59% | 189 | -17.11% | 143 | -10.06% |
| Dec 31, 2024 | 460 | -6.12% | 176,772,092 | 77.69% | 72 | 4.35% | 231 | -52.27% | 160 | - |
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 Q1 | - | - |
| 2025 Q4 | - | - |
| 2025 Q2 | - | - |
| 2025 Q1 | 2 | - |
| 2024 Q4 | - | - |
AMTM Ownership FAQ
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