AMPH NASDAQ
Amphastar Pharmaceuticals, Inc.
1W: +5.0%
1M: -13.5%
3M: -36.4%
YTD: -31.4%
1Y: -27.6%
3Y: -57.7%
5Y: -9.1%
$18.41
+0.25 (+1.38%)
Weekly Expected Move ±12.5%
$13
$15
$17
$19
$21
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🏦 Institutional Activity
Latest: Q1 2026262
Institutions Holding
-3 vs prior
67.2%
Ownership
-42.24%
29
New
59
Increased
152
Reduced
73
Closed
👔 Insider Trades
25 records| Date | Name | Title | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-03-15 | Liawatidewi Yakob | officer: evp corp admin center | F-Tax Withholding | 1,033 | $18.18 | $19K | Filing |
| 2026-03-15 | Zhou Rong | officer: senior evp, production center | F-Tax Withholding | 1,225 | $18.18 | $22K | Filing |
| 2026-03-15 | Luo Mary Z. | officer: coo, chief scientist, chairman | F-Tax Withholding | 2,908 | $18.18 | $53K | Filing |
| 2026-03-15 | Zhang Jack Y. | officer: ceo & chief scientific officer | F-Tax Withholding | 2,908 | $18.18 | $53K | Filing |
| 2026-03-15 | Luo Mary Z. | officer: coo, chief scientist, chairman | F-Tax Withholding | 9,784 | $18.18 | $178K | Filing |
| 2026-03-15 | Zhang Jack Y. | officer: ceo & chief scientific officer | F-Tax Withholding | 9,784 | $18.18 | $178K | Filing |
| 2026-03-15 | PETERS WILLIAM J | officer: cfo, evp & treasurer | F-Tax Withholding | 1,973 | $18.18 | $36K | Filing |
| 2026-03-10 | PETERS WILLIAM J | officer: cfo, evp & treasurer | F-Tax Withholding | 3,297 | $18.91 | $62K | Filing |
| 2026-03-09 | PETERS WILLIAM J | officer: cfo, evp & treasurer | A-Grant/Award | 58,693 | $— | $0 | Filing |
| 2026-03-04 | Luo Mary Z. | officer: coo, chief scientist, chairman | F-Tax Withholding | 2,432 | $19.96 | $49K | Filing |
| 2026-03-04 | Luo Mary Z. | officer: coo, chief scientist, chairman | F-Tax Withholding | 5,769 | $19.96 | $115K | Filing |
| 2026-03-04 | Zhang Jack Y. | officer: ceo & chief scientific officer | F-Tax Withholding | 2,432 | $19.96 | $49K | Filing |
| 2026-03-04 | Zhou Rong | officer: senior evp, production center | F-Tax Withholding | 1,124 | $19.96 | $22K | Filing |
| 2026-03-04 | Liawatidewi Yakob | officer: evp corp admin center | F-Tax Withholding | 965 | $19.96 | $19K | Filing |
| 2026-03-04 | PETERS WILLIAM J | officer: cfo, evp & treasurer | F-Tax Withholding | 1,744 | $19.96 | $35K | Filing |
| 2026-03-04 | Zhang Jack Y. | officer: ceo & chief scientific officer | F-Tax Withholding | 5,769 | $19.96 | $115K | Filing |
| 2025-12-17 | Zhou Rong | officer: senior evp, production center | S-Sale | 9,787 | $26.20 | $256K | Filing |
| 2025-12-12 | Petersen Floyd F. | director | S-Sale | 2,426 | $25.92 | $63K | Filing |
| 2025-12-11 | Petersen Floyd F. | director | S-Sale | 1,737 | $25.69 | $45K | Filing |
| 2025-11-25 | PRINS RICHARD K | director | S-Sale | 4,179 | $27.10 | $113K | Filing |
| 2025-11-13 | Petersen Floyd F. | director | S-Sale | 16,679 | $26.49 | $442K | Filing |
| 2025-11-03 | Petersen Floyd F. | director | S-Sale | 500 | $25.27 | $13K | Filing |
| 2025-10-01 | Petersen Floyd F. | director | S-Sale | 500 | $27.20 | $14K | Filing |
| 2025-09-02 | Petersen Floyd F. | director | S-Sale | 500 | $30.98 | $15K | Filing |
| 2025-08-01 | Petersen Floyd F. | director | S-Sale | 500 | $20.83 | $10K | Filing |
🏛️ Congressional Trades
0 records| Date | Politician | Chamber | Type | Amount | Filing |
|---|---|---|---|---|---|
| No congressional trades found | |||||
🏦 Top Institutional Holders
20 holders| Holder | Shares | Value | Date Reported | Filing | |
|---|---|---|---|---|---|
| BlackRock, Inc. | 5,421,343 | $106M | -40,672 | 2026-03-31 | Filing |
| DIMENSIONAL FUND ADVISORS LP | 2,027,947 | $40M | +228,262 | 2026-03-31 | Filing |
| STATE STREET CORP | 1,607,515 | $31M | +75,729 | 2026-03-31 | Filing |
| VANGUARD CAPITAL MANAGEMENT LLC | 1,543,655 | $30M | +1,543,655 | 2026-03-31 | Filing |
| TD Asset Management Inc | 1,541,044 | $30M | -422,008 | 2026-03-31 | Filing |
| FULLER & THALER ASSET MANAGEMENT, INC. | 1,395,139 | $27M | +676 | 2026-03-31 | Filing |
| AMERICAN CENTURY COMPANIES INC | 1,017,538 | $20M | +352,202 | 2026-03-31 | Filing |
| GEODE CAPITAL MANAGEMENT, LLC | 976,650 | $19M | +89,825 | 2026-03-31 | Filing |
| Boston Trust Walden Corp | 944,789 | $19M | -142,477 | 2026-03-31 | Filing |
| Epoch Investment Partners, Inc. | 898,895 | $18M | -227,690 | 2026-03-31 | Filing |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 787,816 | $15M | +787,816 | 2026-03-31 | Filing |
| Invesco Ltd. | 604,774 | $12M | +103,370 | 2026-03-31 | Filing |
| RENAISSANCE TECHNOLOGIES LLC | 553,900 | $11M | +9,200 | 2026-03-31 | Filing |
| SYSTEMATIC FINANCIAL MANAGEMENT LP | 452,898 | $9M | +17,318 | 2026-03-31 | Filing |
| UBS Group AG | 420,263 | $8M | +163,639 | 2026-03-31 | Filing |
| ROYCE & ASSOCIATES LP | 406,175 | $8M | +53,878 | 2026-03-31 | Filing |
| NORTHERN TRUST CORP | 372,279 | $7M | +888 | 2026-03-31 | Filing |
| Bridge City Capital, LLC | 335,105 | $7M | +99,620 | 2026-03-31 | Filing |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 330,457 | $6M | +6,908 | 2026-03-31 | Filing |
| GOLDMAN SACHS GROUP INC | 329,388 | $6M | -227,321 | 2026-03-31 | Filing |