Amentum Ownership | Who Owns Amentum?
Amentum Ownership Summary
Amentum is owned by 63.81% institutional investors, 2.17% insiders, and 34.02% 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 | 63.81% | 2.17% | 34.02% |
| Sector | Industrials Stocks | 49.61% | 15.69% | 34.70% |
| Industry | Defense Stocks | 54.23% | 11.75% | 34.02% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| American securities | 45.03M | 18.45% | $1.17B |
| Invesco | 21.47M | 8.80% | $560.04M |
| Blackrock funding, inc. /de | 17.84M | 7.31% | $465.30M |
| Vanguard group | 15.41M | 6.34% | $446.94M |
| Primecap management co/ca/ | 12.09M | 4.95% | $315.18M |
| Legacy advisors | 9.06M | 3.71% | $9.06M |
| Fmr | 5.58M | 2.29% | $145.48M |
| State street | 5.08M | 2.08% | $132.46M |
| Frontier capital management | 4.93M | 2.02% | $128.58M |
| Dimensional fund advisors lp | 3.79M | 1.55% | $98.77M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| American securities | 45.03M | 29.88% | $1.17B |
| Segra capital management | 1.61M | 16.96% | $42.06M |
| Brightline capital management | 1.40M | 10.77% | $36.41M |
| Arvin capital management lp | 2.07M | 6.59% | $54.02M |
| Grizzlyrock capital | 289.11K | 5.97% | $7.54M |
| Awh capital | 235.25K | 5.57% | $6.14M |
| Permian investment partners, lp | 1.57M | 4.52% | $40.87M |
| Lingohr & partner asset management gmbh | 175.00K | 4.19% | $4.19M |
| Hyperion capital advisors lp | 303.58K | 3.81% | $7.92M |
| Soviero asset management, lp | 240.00K | 3.13% | $6.26M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Norges bank | 2.29M | 0.01% | 2.29M |
| Dimensional fund advisors lp | 3.79M | 0.02% | 1.95M |
| Permian investment partners, lp | 1.57M | 4.52% | 1.57M |
| Toronto dominion bank | 1.57M | 0.06% | 1.57M |
| Ubs group | 1.71M | 0.01% | 1.50M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Allspring global investments | - | - | -2.42M |
| Exoduspoint capital management, lp | - | - | -1.18M |
| Discovery capital management, llc / ct | 1.14M | 1.50% | -1.16M |
| Fmr | 5.58M | 0.01% | -1.13M |
| Aqr capital management | 507.84K | 0.01% | -944.21K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 2.29M | 0.01% | 2.29M | $66.53M |
| Permian investment partners, lp | 1.57M | 4.52% | 1.57M | $40.87M |
| Toronto dominion bank | 1.57M | 0.06% | 1.57M | $40.82M |
| Troluce capital advisors | 1.00M | 1.60% | 1.00M | $26.08M |
| Vanguard fiduciary trust | 947.46K | 0.01% | 947.46K | $24.71M |
Sold Out
| Holder | Change |
|---|---|
| Dynamic wealth strategies | -1.00 |
| Pacer advisors | -1.00 |
| Tfc financial management | -1.00 |
| Cetera trust company, n.a | -1.00 |
| Wpg advisers | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Mar 31, 2025 | 431 | -5.48% | 189,528,097 | 11.36% | 77 | 1.59% | 189 | -17.11% | 143 | -10.06% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 9.37M | 3.84% | 2.02K |
| Vanguard PRIMECAP Core Inv | 5.27M | 2.16% | 300.00 |
| Vanguard Total Stock Mkt Idx Inv | 4.66M | 1.91% | 13.76K |
| Invesco Small Cap Value A | 4.23M | 1.73% | 492.76K |
| Vanguard Small Cap Index | 3.37M | 1.38% | -7.17K |
| Invesco Value Opportunities A | 2.95M | 1.21% | 479.80K |
| Vanguard Capital Opportunity Inv | 2.58M | 1.06% | -19.90K |
| VanEck Defense ETF A USD Acc | 2.17M | 0.89% | - |
| Vanguard Small Cap Value Index Inv | 2.17M | 0.89% | 15.38K |
| PRIMECAP Odyssey Stock | 1.85M | 0.76% | -8.60K |
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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