| $350M | ||
| $217M | ||
| $172M | ||
| $109M | ||
| $107M | ||
| $104M |
Buys | $0 | 0 | 0 |
Sells | $1,682,901 | 10 | 100 |
| PRINS RICHARD K | director | 0 | $0 | 2 | $275,105 | $-275,105 |
| PETERS WILLIAM J | CFO, EVP & TREASURER | 0 | $0 | 2 | $287,361 | $-287,361 |
| Petersen Floyd F. | director | 0 | $0 | 3 | $549,345 | $-549,345 |
| Zhou Rong | SENIOR EVP, PRODUCTION CENTER | 0 | $0 | 3 | $571,089 | $-571,089 |
Amphastar Pharmaceuticals, Inc., established in 1996 and based in Rancho Cucamonga, California, functions as a biopharmaceutical enterprise. The company is engaged in the creation, production, commercialization, and distribution of both generic and proprietary pharmaceutical products, which include injectables, inhalants, and intranasal formulations. Its market presence extends across the United States, China, and France. Amphastar's operations are divided into two primary segments: Finished Pharmaceutical Products and Active Pharmaceutical …
Over the last 12 months, insiders at Amphastar Pharmaceuticals, Inc. have bought $0 and sold $1.68M worth of Amphastar Pharmaceuticals, Inc. stock.
On average, over the past 5 years, insiders at Amphastar Pharmaceuticals, Inc. have bought $0 and sold $11.2M worth of stock each year.
There was no buying activity among insiders over the last 12 months.
The last purchase of 2,000 shares for transaction amount of $40,520 was made by Maris David (director) on 2020‑08‑14.
| 2026-09-21 | Sale | PETERS WILLIAM J | CFO, EVP & TREASURER | 4,139 0.0099% | $25.00 | $103,475 | +6.47% | |
| 2026-09-16 | Sale | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | 10,000 0.0227% | $23.94 | $239,404 | +8.73% | |
| 2026-09-02 | Sale | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | 3,187 0.0072% | $23.63 | $75,306 | +8.72% | |
| 2026-08-11 | Sale | PRINS RICHARD K | director | 7,973 0.018% | $20.30 | $161,852 | +22.67% | |
| 2026-08-07 | Sale | PETERS WILLIAM J | CFO, EVP & TREASURER | 8,180 0.0203% | $22.48 | $183,886 | +18.96% | |
| 2025-12-17 | Sale | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | 9,787 0.0214% | $26.20 | $256,379 | -16.84% | |
| 2025-12-12 | Sale | Petersen Floyd F. | director | 2,426 0.0054% | $25.92 | $62,888 | -13.89% | |
| 2025-12-11 | Sale | Petersen Floyd F. | director | 1,737 0.0038% | $25.69 | $44,620 | -15.91% | |
| 2025-11-25 | Sale | PRINS RICHARD K | director | 4,179 0.0095% | $27.10 | $113,253 | -20.66% | |
| 2025-11-13 | Sale | Petersen Floyd F. | director | 16,679 0.0365% | $26.49 | $441,837 | -14.16% | |
| 2025-11-03 | Sale | Petersen Floyd F. | director | 500 0.0011% | $25.27 | $12,633 | -9.37% | |
| 2025-10-01 | Sale | Petersen Floyd F. | director | 500 0.0011% | $27.20 | $13,602 | -15.04% | |
| 2025-09-02 | Sale | Petersen Floyd F. | director | 500 0.0011% | $30.98 | $15,492 | -25.19% | |
| 2025-08-01 | Sale | Petersen Floyd F. | director | 500 0.0011% | $20.83 | $10,416 | +14.99% | |
| 2025-07-02 | Sale | Petersen Floyd F. | director | 500 0.0011% | $23.47 | $11,734 | +2.88% | |
| 2025-06-02 | Sale | Petersen Floyd F. | director | 500 0.0011% | $25.67 | $12,835 | -0.04% | |
| 2025-05-01 | Sale | Petersen Floyd F. | director | 500 0.0011% | $24.08 | $12,041 | +6.91% | |
| 2025-04-01 | Sale | Petersen Floyd F. | director | 500 0.0011% | $28.38 | $14,190 | -9.37% | |
| 2025-03-06 | Sale | Petersen Floyd F. | director | 1,000 0.0021% | $27.99 | $27,986 | -8.12% | |
| 2025-03-04 | Sale | PETERS WILLIAM J | CFO, EVP & TREASURER | 4,231 0.0088% | $27.54 | $116,515 | -5.65% |
| Petersen Floyd F. | director | 71368 0.1678% | $2M | 1 | 71 | +27.09% |
| PRINS RICHARD K | director | 29625 0.0696% | $830,092.50 | 2 | 44 | +28.12% |
| Zhang Jack Y. | CEO & Chief Scientific Officer | 6827679 16.0508% | $191.31M | 2 | 35 | +24.35% |
| Koo Richard | director | 253270 0.5954% | $7.1M | 1 | 3 | +27.09% |
| Lee Howard | director | 142939 0.336% | $4.01M | 1 | 18 | +18.46% |
| Shohet Stephen B. | director | 30706 0.0722% | $860,382.12 | 1 | 17 | +27.09% |
| ZASLOFF MICHAEL A | director | 21326 0.0501% | $597,554.52 | 1 | 18 | +29.92% |
| Maris David | director | 13151 0.0309% | $368,491.02 | 1 | 0 | <0.0001% |
$1,279,728,023 | 131 | 10.76% | $3.12B | |
$14,599,168 | 59 | 12.79% | $1.65B | |
$102,709,455 | 46 | 30.55% | $1.45B | |
$73,762,556 | 45 | -9.99% | $2.19B | |
$98,035,963 | 43 | -10.97% | $493.4M |
| Increased Positions | 121 | +44.65% | 3M | +10.05% |
| Decreased Positions | 121 | -44.65% | 2M | -7.58% |
| New Positions | 26 | New | 577,371 | New |
| Sold Out Positions | 35 | Sold Out | 431,955 | Sold Out |
| Total Postitions | 271 | 0% | 34M | +2.47% |
| Blackrock, Inc. | $145,135.00 | 11.92% | 5.49M | -183,736 | -3.24% | 2025-09-30 |
| Vanguard Group Inc | $69,617.00 | 5.72% | 2.63M | -55,910 | -2.08% | 2025-09-30 |
| Td Asset Management Inc | $51,118.00 | 4.2% | 1.93M | -103,038 | -5.06% | 2025-09-30 |
| Dimensional Fund Advisors Lp | $46,455.00 | 3.82% | 1.76M | +128,781 | +7.92% | 2025-09-30 |
| State Street Corp | $39,710.00 | 3.26% | 1.5M | -75,491 | -4.79% | 2025-09-30 |
| Fuller & Thaler Asset Management, Inc. | $35,825.00 | 2.94% | 1.35M | +90,155 | +7.13% | 2025-09-30 |
| Boston Trust Walden Corp | $31,040.00 | 2.55% | 1.17M | -3,346 | -0.28% | 2025-09-30 |
| Epoch Investment Partners, Inc. | $30,005.00 | 2.47% | 1.13M | -107,383 | -8.65% | 2025-09-30 |
| Geode Capital Management, Llc | $24,411.00 | 2.01% | 922,577 | -50,660 | -5.21% | 2025-09-30 |
| Marshall Wace, Llp | $23,128.00 | 1.9% | 874,068 | +25,383 | +2.99% | 2025-09-30 |