Amphastar Pharmaceuticals Ownership | Who Owns Amphastar Pharmaceuticals?
Amphastar Pharmaceuticals Ownership Summary
Amphastar Pharmaceuticals is owned by 18.29% institutional investors, 24.30% insiders, and 57.42% 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 4.71% of its assets in Amphastar Pharmaceuticals shares.
AMPH Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Amphastar Pharmaceuticals | 18.29% | 24.30% | 57.42% |
| Sector | Healthcare Stocks | 42.50% | 10.81% | 46.69% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 26.16% | 11.89% | 61.94% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 5.94M | 12.33% | $237.70M |
| Blackrock funding, inc. /de | 5.49M | 11.68% | $146.18M |
| Vanguard group | 2.63M | 5.60% | $70.12M |
| Td asset management | 1.93M | 4.11% | $51.48B |
| Dimensional fund advisors lp | 1.76M | 3.74% | $46.79M |
| State street | 1.50M | 3.20% | $39.99M |
| Fuller & thaler asset management | 1.35M | 2.88% | $36.08M |
| Boston trust walden | 1.17M | 2.50% | $31.26M |
| Epoch investment partners | 1.13M | 2.42% | $30.22M |
| Geode capital management | 922.58K | 1.97% | $24.59M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Lam group | 130.80K | 2.16% | $3.49M |
| Mesirow institutional investment management | 380.39K | 1.09% | $14.12M |
| Bridge city capital | 136.26K | 0.97% | $3.63M |
| Quantedge capital pte | 45.10K | 0.66% | $1.20M |
| Summerhaven investment management | 38.20K | 0.59% | $1.02M |
| Illumine investment management | 27.68K | 0.53% | $737.59K |
| Denali advisors | 135.00K | 0.41% | $3.60M |
| Systematic financial management lp | 423.11K | 0.27% | $11.28M |
| Significant wealth partners | 20.58K | 0.27% | $548.43K |
| Boston trust walden | 1.17M | 0.23% | $31.26M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Millennium management | 868.55K | 0.01% | 612.00K |
| Arrowstreet capital, limited partnership | 392.31K | 0.01% | 311.07K |
| Clark capital management group | 283.67K | 0.05% | 283.67K |
| Algert global | 392.90K | 0.18% | 268.61K |
| Ubs group | 312.27K | 0.00% | 245.44K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Neuberger berman group | - | - | -1.37M |
| Boston partners | - | - | -423.07K |
| Granite investment partners | - | - | -375.78K |
| Pacer advisors | 6.00K | 0.00% | -320.10K |
| Boone capital management | - | - | -316.56K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Clark capital management group | 283.67K | 0.05% | 283.67K | $7.56M |
| Denali advisors | 135.00K | 0.41% | 135.00K | $3.60M |
| Rice hall james & associates | 129.34K | 0.19% | 129.34K | $3.45M |
| Jefferies financial group | 89.23K | 0.01% | 89.23K | $2.38B |
| Quantedge capital pte | 45.10K | 0.66% | 45.10K | $1.20M |
Sold Out
| Holder | Change |
|---|---|
| Financial gravity asset management | -1.00 |
| Sjs investment consulting | -1.00 |
| Jfs wealth advisors | -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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Dec 31, 2024 | 261 | -7.45% | 35,408,762 | 0.08% | 72 | 1.38% | 116 | -18.31% | 100 | 7.53% |
| Sep 30, 2024 | 280 | 2.94% | 35,359,697 | 2.73% | 72 | 1.47% | 140 | - | 93 | -4.12% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 2.19M | 4.71% | - |
| FullerThaler Behavioral Sm-Cp Eq R6 | 1.21M | 2.60% | - |
| FullerThaler Behavioral Small-Cap Equity | 1.21M | 2.60% | - |
| Vanguard Total Stock Mkt Idx Inv | 1.14M | 2.46% | -25.35K |
| Vanguard US Total Market Shares ETF | 1.14M | 2.40% | 1.24K |
| TD U.S. Capital Reinvestment I | 920.14K | 1.93% | -27.55K |
| iShares Russell 2000 ETF | 896.80K | 1.93% | - |
| Neuberger Berman Genesis Inv | 794.66K | 1.65% | -271.05K |
| Federated Hermes Kaufmann R | 615.00K | 1.26% | - |
| Federated Hermes Kaufmann Small Cap A | 522.39K | 1.10% | -31.39K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Nov 25, 2025 | PRINS RICHARD K | - | Sell | $113.25K |
| Nov 13, 2025 | Petersen Floyd F. | - | Sell | $441.84K |
| Nov 03, 2025 | Petersen Floyd F. | - | Sell | $12.63K |
| Oct 01, 2025 | Petersen Floyd F. | - | Sell | $13.60K |
| Sep 02, 2025 | Petersen Floyd F. | - | Sell | $15.49K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q4 | - | 4 |
| 2025 Q3 | - | 3 |
| 2025 Q2 | - | 3 |
| 2025 Q1 | - | 2 |
| 2024 Q4 | - | 7 |
AMPH Ownership FAQ
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