2m 2m 2m 2m 2m 2m 2m
Amphastar Pharma (AMPH)
NASDAQ
$18.06-$0.39 (-2.14%)
Price as of Jun 03, 2026 4:57 PM EDT- $831.2MMarket Cap
- -29.07%1-Year Change
- Drug Manufacturers - Specialty & GenericIndustry
Amphastar Pharma (AMPH)
$18.06-$0.39 (-2.14%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
BLACKROCK FUNDING, INC. /DE | 13.87% | 6.1M | +85,100 (+1.39%) | Dec 31, 2024 |
BLACKROCK INC. | 13.48% | 5.9M | -136,518 (-2.30%) | Jun 30, 2024 |
BLACKROCK, INC. | 12.30% | 5.4M | -40,672 (-0.75%) | Mar 31, 2026 |
BLACKROCK FUND ADVISORS | 8.85% | 3.9M | +815,286 (+20.90%) | Dec 31, 2016 |
VANGUARD GROUP INC | 5.92% | 2.6M | -22,882 (-0.88%) | Dec 31, 2025 |
DIMENSIONAL FUND ADVISORS LP | 4.60% | 2.0M | +228,262 (+11.26%) | Mar 31, 2026 |
STATE STREET CORP | 3.65% | 1.6M | +75,729 (+4.71%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
Virtus Strategy Trust | 24.77% | 10.9M | 0 (0.00%) | Sep 30, 2025 |
iSHARES TRUST | 8.66% | 3.8M | +12,848 (+0.34%) | Mar 31, 2026 |
BANCROFT FUND LTD | 6.80% | 3.0M | 0 (0.00%) | Dec 31, 2025 |
ELLSWORTH GROWTH & INCOME FUND LTD | 6.80% | 3.0M | 0 (0.00%) | Dec 31, 2025 |
Virtus Convertible & Income Fund | 5.05% | 2.2M | 0 (0.00%) | Jan 30, 2026 |
Virtus Dividend, Interest & Premium Strategy Fund | 4.33% | 1.9M | 0 (0.00%) | Jan 30, 2026 |
Virtus Convertible & Income Fund II | 3.99% | 1.8M | 0 (0.00%) | Jan 30, 2026 |
Current Ownership Distribution
- Institutions587.5M (62.03%)
- Mutual Funds346.7M (36.61%)
- Insiders12.8M (1.36%)
- Other0 (0.00%)
Insider Transactions
- 1.36% (12.8M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 2Number of InsiderSelling (last 12 months)
- $12.3MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
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 |
Zhou Rong SENIOR EVP, PRODUCTION CENTER | Exempt | Dec 17, 2025 | $110,886.71 | 9,787 | $11.33 | 147,830 |
Zhou Rong SENIOR EVP, PRODUCTION CENTER | Sell | Dec 17, 2025 | $256,379.27 | 9,787 | $26.20 | 138,043 |
Petersen Floyd F. | Exempt | Nov 13, 2025 | $0.00 | 16,679 | $0.00 | 0 |
Petersen Floyd F. | Exempt | Nov 13, 2025 | $278,372.51 | 16,679 | $16.69 | 92,210 |
Petersen Floyd F. | Sell | Nov 13, 2025 | $441,836.72 | 16,679 | $26.49 | 75,531 |
Petersen Floyd F. | Sell | Nov 03, 2025 | $12,633.10 | 500 | $25.27 | 75,531 |
Petersen Floyd F. | Sell | Oct 01, 2025 | $13,602.40 | 500 | $27.20 | 76,031 |
Petersen Floyd F. | Sell | Aug 01, 2025 | $10,415.75 | 500 | $20.83 | 77,031 |
Gaugh David Russell | Award | Jul 18, 2025 | $0.00 | 13,987 | $0.00 | 13,987 |
Gaugh David Russell | Award | Jul 18, 2025 | $0.00 | 6,304 | $0.00 | 6,304 |
Petersen Floyd F. | Sell | Jul 02, 2025 | $11,733.95 | 500 | $23.47 | 77,531 |