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Amphastar Pharma (AMPH)
NASDAQ
$29.00+$0.40 (+1.40%)
Price as of Nov 12, 2026 8:33 AM EST- $1.2BMarket Cap
- 2.77%1-Year Change
- Drug Manufacturers - Specialty & GenericIndustry
Amphastar Pharma (AMPH)
$29.00+$0.40 (+1.40%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
BLACKROCK FUNDING, INC. /DE | 14.34% | 6.1M | +85,100 (+1.39%) | Dec 31, 2024 |
BLACKROCK INC. | 13.93% | 5.9M | -136,518 (-2.30%) | Jun 30, 2024 |
BLACKROCK, INC. | 12.25% | 5.2M | -196,409 (-3.76%) | Jun 30, 2026 |
BLACKROCK FUND ADVISORS | 9.15% | 3.9M | +815,286 (+20.90%) | Dec 31, 2016 |
VANGUARD GROUP INC | 6.12% | 2.6M | -22,882 (-0.88%) | Dec 31, 2025 |
DIMENSIONAL FUND ADVISORS LP | 5.59% | 2.4M | +77,884 (+3.27%) | Sep 30, 2026 |
STATE STREET CORP | 3.85% | 1.6M | +34,611 (+2.11%) | Jun 30, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD INDEX FUNDS | 3.39% | 1.4M | -58,602 (-4.05%) | Jun 30, 2026 |
DFA INVESTMENT DIMENSIONS GROUP INC | 3.17% | 1.4M | +195,595 (+14.45%) | Jul 31, 2026 |
AMERICAN CENTURY ETF TRUST | 3.03% | 1.3M | +213,358 (+16.50%) | Aug 31, 2026 |
Dimensional ETF Trust | 1.71% | 729,028 | +11,462 (+1.57%) | Jul 31, 2026 |
FIDELITY SALEM STREET TRUST | 0.84% | 359,152 | +313,927 (+87.41%) | Jul 31, 2026 |
FIDELITY CONCORD STREET TRUST | 0.76% | 324,134 | -11,863 (-3.66%) | Aug 31, 2026 |
FIRST TRUST EXCHANGE-TRADED ALPHADEX FUND | 0.67% | 285,598 | +44,004 (+15.41%) | Jul 31, 2026 |
Current Ownership Distribution
- Institutions624.2M (60.07%)
- Mutual Funds402.2M (38.70%)
- Insiders12.8M (1.23%)
- Other0 (0.00%)
Insider Transactions
- 1.23% (12.8M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 4Number of InsiderSelling (last 12 months)
- $22.0MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
PETERS WILLIAM J CFO, EVP & TREASURER | Exempt | Nov 05, 2026 | $0.00 | 11,000 | $0.00 | 67,833 |
PETERS WILLIAM J CFO, EVP & TREASURER | Exempt | Nov 05, 2026 | $197,890.00 | 11,000 | $17.99 | 179,707 |
PETERS WILLIAM J CFO, EVP & TREASURER | Sell | Nov 05, 2026 | $366,189.11 | 12,631 | $28.99 | 167,076 |
PETERS WILLIAM J CFO, EVP & TREASURER | Exempt | Nov 04, 2026 | $208,480.00 | 16,000 | $13.03 | 184,707 |
PETERS WILLIAM J CFO, EVP & TREASURER | Sell | Nov 04, 2026 | $448,480.00 | 16,000 | $28.03 | 168,707 |
PETERS WILLIAM J CFO, EVP & TREASURER | Exempt | Nov 04, 2026 | $0.00 | 16,000 | $0.00 | 7,674 |
PETERS WILLIAM J CFO, EVP & TREASURER | Sell | Sep 21, 2026 | $103,475.00 | 4,139 | $25.00 | 168,707 |
Zhou Rong SENIOR EVP, PRODUCTION CENTER | Exempt | Sep 16, 2026 | $0.00 | 10,000 | $0.00 | 19,424 |
Zhou Rong SENIOR EVP, PRODUCTION CENTER | Exempt | Sep 16, 2026 | $133,500.00 | 10,000 | $13.35 | 179,203 |
Zhou Rong SENIOR EVP, PRODUCTION CENTER | Sell | Sep 16, 2026 | $239,404.00 | 10,000 | $23.94 | 169,203 |
PRINS RICHARD K | Sell | Aug 11, 2026 | $161,851.90 | 7,973 | $20.30 | 29,625 |
Liawatidewi Yakob EVP CORP ADMIN CENTER | In Kind | Mar 15, 2026 | $18,779.94 | 1,033 | $18.18 | 121,892 |
PETERS WILLIAM J CFO, EVP & TREASURER | In Kind | Mar 15, 2026 | $35,869.14 | 1,973 | $18.18 | 175,063 |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | In Kind | Mar 15, 2026 | $177,873.12 | 9,784 | $18.18 | 3.0M |
Zhou Rong SENIOR EVP, PRODUCTION CENTER | In Kind | Mar 15, 2026 | $22,270.50 | 1,225 | $18.18 | 171,554 |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | In Kind | Mar 15, 2026 | $52,867.44 | 2,908 | $18.18 | 1.2M |
PETERS WILLIAM J CFO, EVP & TREASURER | In Kind | Mar 10, 2026 | $62,346.27 | 3,297 | $18.91 | 177,036 |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | In Kind | Mar 10, 2026 | $279,584.35 | 14,785 | $18.91 | 3.0M |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | In Kind | Mar 10, 2026 | $83,109.45 | 4,395 | $18.91 | 1.2M |
Liawatidewi Yakob EVP CORP ADMIN CENTER | In Kind | Mar 10, 2026 | $35,361.70 | 1,870 | $18.91 | 122,925 |
PETERS WILLIAM J CFO, EVP & TREASURER | Award | Mar 09, 2026 | $0.00 | 121,071 | $0.00 | 121,071 |
Liawatidewi Yakob EVP CORP ADMIN CENTER | Award | Mar 09, 2026 | $0.00 | 73,126 | $0.00 | 73,126 |
PETERS WILLIAM J CFO, EVP & TREASURER | Award | Mar 09, 2026 | $0.00 | 58,693 | $0.00 | 180,333 |
Liawatidewi Yakob EVP CORP ADMIN CENTER | Award | Mar 09, 2026 | $0.00 | 35,450 | $0.00 | 124,795 |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Award | Mar 09, 2026 | $0.00 | 72,462 | $0.00 | 1.3M |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Award | Mar 09, 2026 | $0.00 | 372,338 | $0.00 | 372,338 |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Award | Mar 09, 2026 | $0.00 | 149,472 | $0.00 | 149,472 |
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Award | Mar 09, 2026 | $0.00 | 180,504 | $0.00 | 3.0M |
Liawatidewi Yakob EVP CORP ADMIN CENTER | In Kind | Mar 04, 2026 | $19,261.40 | 965 | $19.96 | 90,489 |
Zhou Rong SENIOR EVP, PRODUCTION CENTER | Exempt | Dec 17, 2025 | $0.00 | 9,787 | $0.00 | 0 |