Amentum Ownership | Who Owns Amentum?
Amentum Ownership Summary
Amentum is owned by 81.73% institutional investors, 44.52% insiders. American securities is the largest institutional shareholder, holding 18.53% of AMTM shares.
AMTM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Amentum | 81.73% | 44.52% | -26.25% |
| Sector | Industrials Stocks | 64.07% | 12.69% | 23.24% |
| Industry | Defense Stocks | 62.16% | 10.39% | 27.46% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| American securities | 45.03M | 18.53% | $1.06T |
| Blackrock funding, inc. /de | 19.00M | 7.82% | $448.47M |
| Primecap management co/ca/ | 12.03M | 4.95% | $284.04M |
| Frontier capital management | 5.46M | 2.25% | $128.93M |
| Van eck associates | 3.07M | 1.26% | $72.44M |
| Kovitz investment group partners | 3.00M | 1.23% | $70.85M |
| Ruane, cunniff & goldfarb | 2.44M | 1.00% | $57.65M |
| Discovery capital management, llc / ct | 2.30M | 0.95% | $54.28M |
| Arvin capital management lp | 2.14M | 0.88% | $50.51M |
| Fil | 2.07M | 0.85% | $48.81M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| American securities | 45.03M | 100.00% | $1.06T |
| Arvin capital management lp | 2.14M | 10.34% | $50.51M |
| Brightline capital management | 1.00M | 10.17% | $23.61M |
| Awh capital | 165.25K | 4.55% | $3.90M |
| Discovery capital management, llc / ct | 2.30M | 4.24% | $54.28M |
| 683 capital management | 1.63M | 2.53% | $38.48M |
| Voss capital | 1.40M | 2.28% | $33.05M |
| Avenir | 895.35K | 2.17% | $21.14M |
| Penn capital management company | 1.00M | 2.05% | $23.76M |
| Kopernik global investors | 636.23K | 1.65% | $15.02M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Primecap management co/ca/ | 12.03M | 0.23% | 1.97M |
| Frontier capital management | 5.46M | 1.19% | 1.88M |
| American securities | 45.03M | 100.00% | 1.13M |
| Brightline capital management | 1.00M | 10.17% | 1.00M |
| Freestone grove partners lp | 2.05M | 0.37% | 887.02K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Allspring global investments | - | - | -2.42M |
| Wellington management group llp | - | - | -2.33M |
| Balyasny asset management | - | - | -1.88M |
| Cooper creek partners management | - | - | -1.22M |
| Mirae asset global etfs | - | - | -869.60K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Brightline capital management | 1.00M | 10.17% | 1.00M | $23.61M |
| Soviero asset management, lp | 110.00K | 1.57% | 110.00K | $2.60M |
| Gamco investors, inc. et al | 108.67K | 0.03% | 108.67K | $2.57M |
| Coastal bridge advisors | 60.41K | 0.12% | 60.41K | $1.43M |
| Gabelli funds | 25.05K | 0.00% | 25.05K | $591.50K |
Sold Out
| Holder | Change |
|---|---|
| Tfc financial management | -1.00 |
| Pacer advisors | -1.00 |
| First horizon advisors | -2.00 |
| Dinuzzo private wealth | -2.00 |
| Maryland capital advisors | -3.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | - |
| Sep 30, 2024 | 490 | - | 99,482,357 | - | 40 | - | 484 | - | - | - |
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 |
|---|---|---|
| 2025 Q2 | - | - |
| 2025 Q1 | 2 | - |
| 2024 Q4 | - | - |
| 2024 Q3 | - | - |
AMTM Ownership FAQ
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