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 4.86% 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 | 35.58% | 11.87% | 52.55% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 20.67% | 13.90% | 65.43% |
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 |
| Td asset management | 1.54M | 3.30% | $30.19M |
| 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 |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Bridge city capital | 335.11K | 1.82% | $6.56M |
| Lam group | 130.80K | 1.41% | $2.56M |
| 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 | 0.39% | $639.28K |
| Nverses capital | 17.68K | 0.31% | $346.45K |
| Hussman strategic advisors | 63.00K | 0.27% | $1.23M |
| Rice hall james & associates | 187.35K | 0.20% | $3.67M |
| Systematic financial management lp | 452.90K | 0.20% | $8.87M |
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 |
|---|---|---|---|
| Neuberger berman group | - | - | -1.37M |
| Boston partners | - | - | -423.07K |
| Td asset management | 1.54M | 0.02% | -422.01K |
| Hotchkis & wiley capital management | - | - | -402.56K |
| Granite investment partners | - | - | -375.78K |
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 |
| Robeco institutional asset management b.v. | 66.41K | 0.00% | 66.41K | $1.30M |
| Hussman strategic advisors | 63.00K | 0.27% | 63.00K | $1.23M |
| Vanguard global advisers | 50.16K | 0.00% | 50.16K | $982.69K |
Sold Out
| Holder | Change |
|---|---|
| Sjs investment consulting | -1.00 |
| Financial gravity asset management | -1.00 |
| Caitong asset management | -3.00 |
| Jfs wealth advisors | -3.00 |
| Wealthtrak capital management | -5.00 |
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 | 2.16M | 4.86% | 564.00 |
| FullerThaler Behavioral Small-Cap Equity | 1.34M | 2.95% | 46.67K |
| FullerThaler Behavioral Sm-Cp Eq R6 | 1.34M | 2.95% | 46.67K |
| FullerThaler Beh Small-Cap Equity SMA | 1.34M | 2.95% | - |
| Vanguard Total Stock Mkt Idx Inv | 1.11M | 2.49% | - |
| Vanguard US Total Market Shares ETF | 1.14M | 2.40% | 1.24K |
| TD U.S. Capital Reinvestment I | 981.53K | 2.16% | -51.47K |
| Avantis US Small Cap Value ETF | 874.86K | 1.96% | - |
| iShares Russell 2000 ETF | 844.94K | 1.90% | 7.14K |
| TD Epoch U.S. Quality Capital Reinvestmt | 770.52K | 1.73% | -211.00K |
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 Q1 | - | - |
| 2025 Q4 | - | 7 |
| 2025 Q3 | - | 3 |
| 2025 Q2 | - | 3 |
| 2025 Q1 | - | 2 |
AMPH Ownership FAQ
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