Amphastar Pharmaceuticals Ownership | Who Owns Amphastar Pharmaceuticals?
Amphastar Pharmaceuticals Ownership Summary
Amphastar Pharmaceuticals is owned by 68.20% institutional investors, 29.63% insiders, and 2.17% 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 4.70% of its assets in Amphastar Pharmaceuticals shares.
AMPH Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Amphastar Pharmaceuticals | 68.20% | 29.63% | 2.17% |
| Sector | Healthcare Stocks | 35.56% | 12.08% | 52.36% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 21.33% | 14.37% | 64.29% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 5.94M | 12.33% | $237.70M |
| Blackrock funding, inc. /de | 5.42M | 11.60% | $106.20M |
| Vanguard group | 2.61M | 5.61% | $69.85M |
| Dimensional fund advisors lp | 2.03M | 4.34% | $39.73M |
| State street | 1.61M | 3.44% | $31.49M |
| Fuller & thaler asset management | 1.40M | 2.98% | $27.33M |
| Marshall wace, llp | 1.03M | 2.19% | $20.09M |
| American century companies | 1.02M | 2.18% | $19.93M |
| Geode capital management | 976.65K | 2.09% | $19.14M |
| Epoch investment partners | 898.89K | 1.92% | $17.61M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Bridge city capital | 335.11K | 1.82% | $6.56M |
| Lam group | 130.80K | 1.31% | $2.64M |
| Mesirow institutional investment management | 380.39K | 1.09% | $14.12M |
| Denali advisors | 266.46K | 0.58% | $5.22M |
| 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 |
| Rice hall james & associates | 187.35K | 0.20% | $3.67M |
| Systematic financial management lp | 452.90K | 0.20% | $8.87M |
| Quantedge capital pte | 13.50K | 0.14% | $264.46K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Lsv asset management | 651.71K | 0.03% | 541.41K |
| American century companies | 1.02M | 0.01% | 352.20K |
| Vanguard fiduciary trust | 231.04K | 0.00% | 231.04K |
| Dimensional fund advisors lp | 2.03M | 0.01% | 228.26K |
| Ubs group | 420.26K | 0.00% | 163.64K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Td asset management | - | - | -1.54M |
| Neuberger berman group | - | - | -1.37M |
| Boston trust walden | - | - | -944.79K |
| Boston partners | - | - | -423.07K |
| Hotchkis & wiley capital management | - | - | -402.56K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Vanguard fiduciary trust | 231.04K | 0.00% | 231.04K | $4.53M |
| Brandywine global investment management | 105.42K | 0.02% | 105.42K | $2.82M |
| Vanguard global advisers | 50.16K | 0.00% | 50.16K | $982.69K |
| Hsbc | 38.02K | 0.00% | 38.02K | $753.50K |
| Y-intercept (hong kong) | 34.70K | 0.01% | 34.70K | $700.33K |
Sold Out
| Holder | Change |
|---|---|
| Cedar mountain advisors | -1.00 |
| Financial gravity asset management | -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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Mar 31, 2025 | 5 | -98.12% | 1,063,934 | -97.00% | 2 | 0.04% | 3 | -97.50% | 2 | -98.02% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 2.07M | 4.70% | 178.00 |
| FullerThaler Behavioral Sm-Cp Eq R6 | 1.43M | 3.24% | 92.11K |
| FullerThaler Behavioral Small-Cap Equity | 1.34M | 3.03% | - |
| FullerThaler Beh Small-Cap Equity SMA | 1.34M | 2.95% | - |
| Avantis US Small Cap Value ETF | 1.06M | 2.40% | 1.08K |
| 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 |
| iShares Russell 2000 ETF | 850.48K | 1.93% | 9.18K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| 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 |
| Nov 25, 2025 | PRINS RICHARD K | - | Sell | $113.25K |
| Nov 13, 2025 | Petersen Floyd F. | - | Sell | $441.84K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | - |
| 2026 Q1 | - | - |
| 2025 Q4 | - | 7 |
| 2025 Q3 | - | 3 |
| 2025 Q2 | - | 3 |
AMPH Ownership FAQ
Try Tickergate Pro Free
Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)
Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis
Discover trending investment themes
Find your next best investment
Research stocks using tools