Amphastar Pharmaceuticals Ownership | Who Owns Amphastar Pharmaceuticals?
Amphastar Pharmaceuticals Ownership Summary
Amphastar Pharmaceuticals is owned by 63.10% institutional investors, 30.82% insiders, and 6.07% retail investors. Blackrock is the largest institutional shareholder, holding 12.33% of AMPH shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 4.67% of its assets in Amphastar Pharmaceuticals shares.
AMPH Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Amphastar Pharmaceuticals | 63.10% | 30.82% | 6.07% |
| Sector | Healthcare Stocks | 50.59% | 12.40% | 37.01% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 35.37% | 14.85% | 49.78% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 5.94M | 12.33% | $237.70M |
| Blackrock funding, inc. /de | 5.22M | 11.53% | $105.44M |
| Vanguard group | 2.61M | 5.61% | $69.85M |
| Dimensional fund advisors lp | 2.31M | 5.09% | $46.52M |
| State street | 1.64M | 3.62% | $33.14M |
| Vanguard capital management | 1.48M | 3.27% | $29.91M |
| American century companies | 1.18M | 2.60% | $23.74M |
| Marshall wace, llp | 1.07M | 2.35% | $21.52M |
| Geode capital management | 969.84K | 2.14% | $19.58M |
| Fuller & thaler asset management | 949.24K | 2.09% | $19.16M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Bridge city capital | 338.71K | 1.56% | $6.84M |
| Lam group | 130.80K | 1.31% | $2.64M |
| Mesirow institutional investment management | 380.39K | 1.09% | $14.12M |
| Denali advisors | 375.96K | 0.76% | $7.59M |
| Illumine investment management | 28.08K | 0.42% | $550.05K |
| Summerhaven investment management | 32.63K | 0.35% | $658.53K |
| Significant wealth partners | 10.42K | 0.23% | $210.36K |
| Systematic financial management lp | 437.38K | 0.18% | $8.83M |
| Virtus fund advisers | 1.22K | 0.14% | $45.30K |
| Corient ia | 6.67K | 0.12% | $134.60K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Hrt financial lp | 387.53K | 0.01% | 331.35K |
| Sixth street partners management company | 310.18K | 0.00% | 310.18K |
| Dimensional fund advisors lp | 2.31M | 0.01% | 277.16K |
| D. e. shaw | 887.05K | 0.01% | 221.51K |
| Goldman sachs group | 505.36K | 0.00% | 175.97K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Td asset management | - | - | -1.54M |
| Neuberger berman group | - | - | -1.37M |
| Boston trust walden | - | - | -944.79K |
| Epoch investment partners | - | - | -898.89K |
| Invesco | 158.06K | 0.00% | -446.71K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Sixth street partners management company | 310.18K | 0.00% | 310.18K | $6.26M |
| Brandywine global investment management | 105.42K | 0.02% | 105.42K | $2.82M |
| Point72 asset management | 54.96K | 0.00% | 54.96K | $1.11M |
| Y-intercept (hong kong) | 34.70K | 0.01% | 34.70K | $700.33K |
| Engineers gate manager lp | 30.19K | 0.01% | 30.19K | $609.25K |
Sold Out
| Holder | Change |
|---|---|
| Financial gravity asset management | -1.00 |
| Cedar mountain advisors | -1.00 |
| Caitong asset management | -3.00 |
| Wealthtrak capital management | -5.00 |
| Nelson, van denburg & campbell wealth management group | -7.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 211 | -2.31% | 28,599,629 | -11.58% | 63 | 1.32% | 94 | -6.00% | 75 | -18.48% |
| Mar 31, 2026 | 210 | -11.02% | 31,878,295 | -5.06% | 68 | 1.31% | 98 | -16.24% | 88 | - |
| Dec 31, 2025 | 76 | -68.98% | 5,515,721 | -83.16% | 11 | 0.24% | 31 | -74.17% | 32 | -63.64% |
| Sep 30, 2025 | 104 | -55.93% | 8,585,305 | -72.26% | 18 | 0.42% | 45 | -65.91% | 47 | -33.80% |
| Jun 30, 2025 | 237 | -2.47% | 32,613,359 | -1.94% | 69 | 1.43% | 132 | 14.78% | 70 | -25.53% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 2.06M | 4.67% | -10.72K |
| Vanguard MStar Total Stk Mkt Idx Invest | 1.06M | 2.48% | - |
| Avantis US Small Cap Value ETF | 1.06M | 2.41% | 2.08K |
| Vanguard US Total Market Shares ETF | 1.14M | 2.40% | 1.24K |
| Vanguard Total Stock Mkt Idx Inv | 1.06M | 2.39% | -53.70K |
| Vanguard Morn Total Stk Mkt Idx Investor | 1.06M | 2.39% | -53.70K |
| TD U.S. Capital Reinvestment I | 981.53K | 2.16% | -51.47K |
| FullerThaler Behavioral Sm-Cp Eq R6 | 902.74K | 2.12% | -526.20K |
| FullerThaler Beh Small-Cap Equity SMA | 902.74K | 2.12% | -434.09K |
| FullerThaler Behavioral Small-Cap Equity | 902.74K | 2.12% | -434.09K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Aug 11, 2026 | PRINS RICHARD K | - | Sell | $161.85K |
| Aug 07, 2026 | PETERS WILLIAM J | CFO, EVP & TREASURER | Sell | $183.89K |
| Dec 17, 2025 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sell | $256.38K |
| Dec 12, 2025 | Petersen Floyd F. | - | Sell | $62.89K |
| Dec 11, 2025 | Petersen Floyd F. | - | Sell | $44.62K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q3 | - | 2 |
| 2026 Q2 | - | - |
| 2026 Q1 | - | - |
| 2025 Q4 | - | 7 |
| 2025 Q3 | - | 3 |
AMPH Ownership FAQ
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