Amphastar Pharmaceuticals Ownership | Who Owns Amphastar Pharmaceuticals?
Amphastar Pharmaceuticals Ownership Summary
Amphastar Pharmaceuticals is owned by 69.47% institutional investors, 24.02% insiders, and 6.52% 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 4.74% of its assets in Amphastar Pharmaceuticals shares.
AMPH Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Amphastar Pharmaceuticals | 69.47% | 24.02% | 6.52% |
| Sector | Healthcare Stocks | 486.50% | 11.08% | -397.59% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 43.67% | 11.42% | 44.91% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 5.94M | 12.33% | $237.70M |
| Blackrock funding, inc. /de | 5.67M | 12.07% | $130.16M |
| Vanguard group | 2.71M | 5.58% | $100.79M |
| Td asset management | 1.84M | 3.79% | $68.33M |
| State street | 1.60M | 3.28% | $59.26M |
| Pacer advisors | 1.35M | 2.78% | $50.14M |
| Fuller & thaler asset management | 1.26M | 2.69% | $29.02M |
| Epoch investment partners | 1.24M | 2.64% | $28.50M |
| Dimensional fund advisors lp | 1.20M | 2.47% | $44.50M |
| Boston trust walden | 978.92K | 2.01% | $36.35M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Lam group | 130.80K | 3.46% | $4.86M |
| Mesirow institutional investment management | 380.39K | 1.09% | $14.12M |
| Bridge city capital | 138.64K | 0.89% | $3.18M |
| Aurora investment counsel | 53.25K | 0.64% | $1.22M |
| Boston trust walden | 978.92K | 0.26% | $36.35M |
| Systematic financial management lp | 359.31K | 0.22% | $8.25M |
| Significant wealth partners | 16.18K | 0.18% | $371.45K |
| Epoch investment partners | 1.24M | 0.15% | $28.50M |
| Virtus fund advisers | 1.22K | 0.14% | $45.30K |
| Pacer advisors | 1.35M | 0.11% | $50.14M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Pacer advisors | 1.35M | 0.11% | 1.35M |
| Millennium management | 868.55K | 0.01% | 612.00K |
| Boston trust walden | 978.92K | 0.26% | 439.28K |
| Qube research | 469.49K | 0.01% | 210.51K |
| Voloridge investment management | 325.51K | 0.03% | 109.51K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Neuberger berman group | - | - | -1.37M |
| Federated hermes | 823.49K | 0.07% | -1.12M |
| Blackrock funding, inc. /de | 5.67M | 0.00% | -478.87K |
| Boston partners | - | - | -423.07K |
| Granite investment partners | - | - | -375.78K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Empowered funds | 85.11K | 0.02% | 85.11K | $1.95M |
| Arrowstreet capital, limited partnership | 81.24K | 0.00% | 81.24K | $1.87M |
| Jump financial | 63.33K | 0.02% | 63.33K | $1.45M |
| Susquehanna portfolio strategies | 39.56K | 0.02% | 39.56K | $908.39K |
| Edgestream partners | 37.11K | 0.02% | 37.11K | $852.09K |
Sold Out
| Holder | Change |
|---|---|
| Financial gravity asset management | -1.00 |
| Sjs investment consulting | -1.00 |
| Jfs wealth advisors | -3.00 |
| Nelson, van denburg & campbell wealth management group | -7.00 |
| Bruce g. allen investments | -9.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Jun 30, 2024 | 268 | -1.83% | 34,405,302 | 2.58% | 71 | 1.47% | 138 | 2.99% | 96 | -1.03% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 2.20M | 4.74% | 386.00 |
| FullerThaler Behavioral Sm-Cp Eq R6 | 1.21M | 2.56% | 126.06K |
| FullerThaler Behavioral Small-Cap Equity | 1.21M | 2.56% | 126.06K |
| 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 | 877.56K | 1.89% | -16.70K |
| 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 |
|---|---|---|---|---|
| Aug 01, 2025 | Petersen Floyd F. | - | Sell | $10.42K |
| Jul 02, 2025 | Petersen Floyd F. | - | Sell | $11.73K |
| Jun 02, 2025 | Petersen Floyd F. | - | Sell | $12.84K |
| May 01, 2025 | Petersen Floyd F. | - | Sell | $12.04K |
| Apr 01, 2025 | Petersen Floyd F. | - | Sell | $14.19K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q3 | - | 1 |
| 2025 Q2 | - | 3 |
| 2025 Q1 | - | 2 |
| 2024 Q4 | - | 7 |
| 2024 Q3 | - | 5 |
AMPH Ownership FAQ
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