Petersen Floyd F. sold Amphastar Pharmaceuticals ($AMPH) shares on the open market 11 times over the last year, totaling 652 thousand dollars, with the most recent sale on December 12, 2025. These sales rank 5,915th among 11,678 individual insiders in our database, where the average is 8.6 million dollars across about 6 transactions per insider. Petersen Floyd F. made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 12, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 2426 | $25.92 | 71,368.0000 | 47,677,000 | 3.29% | 0.01% |
| Dec. 11, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 1737 | $25.69 | 73,794.0000 | 47,677,000 | 2.30% | 0.00% |
| Nov. 13, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | M | Common Stock | 16679 | $16.69 | 92,210.0000 | 47,677,000 | 22.08% | 0.03% |
| Nov. 13, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 16679 | $26.49 | 75,531.0000 | 47,677,000 | 18.09% | 0.03% |
| Nov. 13, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | M | Stock Option (right to buy) | 16679 | $0.00 | 0.0000 | 47,677,000 | 100.00% | 0.03% |
| Nov. 3, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $25.27 | 75,531.0000 | 47,677,000 | 0.66% | 0.00% |
| Oct. 1, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $27.20 | 76,031.0000 | 47,677,000 | 0.65% | 0.00% |
| Sept. 2, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $30.98 | 76,531.0000 | 48,128,000 | 0.65% | 0.00% |
| Aug. 1, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $20.83 | 77,031.0000 | 48,128,000 | 0.64% | 0.00% |
| July 2, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $23.47 | 77,531.0000 | 48,128,000 | 0.64% | 0.00% |
| June 2, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | A | Stock Option (right to buy) | 11402 | $0.00 | 11,402.0000 | 49,890,000 | 9999.99% | 0.02% |
| June 2, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | A | Common Stock | 5122 | $0.00 | 78,031.0000 | 49,890,000 | 7.03% | 0.01% |
| June 2, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $25.67 | 72,909.0000 | 49,890,000 | 0.68% | 0.00% |
| May 1, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $24.08 | 73,409.0000 | 49,890,000 | 0.68% | 0.00% |
| April 1, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $28.38 | 73,909.0000 | 49,890,000 | 0.67% | 0.00% |
| March 6, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 1000 | $27.99 | 74,409.0000 | 52,058,000 | 1.33% | 0.00% |
| Sept. 5, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 3000 | $46.47 | 75,409.0000 | 52,046,000 | 3.83% | 0.01% |
| June 10, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 3000 | $41.40 | 78,409.0000 | 53,013,000 | 3.69% | 0.01% |
| June 3, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | A | Stock Option (right to buy) | 6864 | $0.00 | 6,864.0000 | 53,013,000 | 9999.99% | 0.01% |
| June 3, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $42.65 | 78,333.0000 | 53,013,000 | 0.63% | 0.00% |
| June 3, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | A | Common Stock | 3076 | $0.00 | 81,409.0000 | 53,013,000 | 3.93% | 0.01% |
| May 1, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $41.67 | 78,833.0000 | 53,013,000 | 0.63% | 0.00% |
| April 1, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 500 | $43.43 | 79,333.0000 | 53,013,000 | 0.63% | 0.00% |
| March 1, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 451 | $45.60 | 79,882.0000 | 53,001,000 | 0.56% | 0.00% |
| March 1, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Not found | S | Common Stock | 49 | $46.53 | 79,833.0000 | 53,001,000 | 0.06% | 0.00% |
| Feb. 1, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 26 | $53.64 | 80,333.0000 | 53,001,000 | 0.03% | 0.00% |
| Feb. 1, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 474 | $53.07 | 80,359.0000 | 53,001,000 | 0.59% | 0.00% |
| Jan. 2, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 353 | $61.70 | 80,833.0000 | 53,001,000 | 0.43% | 0.00% |
| Jan. 2, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 147 | $60.56 | 81,186.0000 | 53,001,000 | 0.18% | 0.00% |
| Dec. 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 365 | $58.15 | 81,333.0000 | 53,921,000 | 0.45% | 0.00% |
| Dec. 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 135 | $57.24 | 81,698.0000 | 53,921,000 | 0.16% | 0.00% |
| Nov. 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 500 | $45.30 | 81,833.0000 | 53,921,000 | 0.61% | 0.00% |
| Oct. 2, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 500 | $45.78 | 82,333.0000 | 53,921,000 | 0.60% | 0.00% |
| June 5, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | A | Stock Option (right to buy) | 7016 | $0.00 | 7,016.0000 | 51,970,000 | 9999.99% | 0.01% |
| June 5, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | A | Common Stock | 2716 | $0.00 | 82,833.0000 | 51,970,000 | 3.39% | 0.01% |
| May 17, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 5000 | $43.13 | 80,117.0000 | 51,970,000 | 5.87% | 0.01% |
| April 3, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 491 | $37.72 | 85,117.0000 | 51,970,000 | 0.57% | 0.00% |
| March 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 412 | $36.59 | 85,695.0000 | 52,427,000 | 0.48% | 0.00% |
| March 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 87 | $37.25 | 85,608.0000 | 52,427,000 | 0.10% | 0.00% |
| March 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 1 | $33.70 | 86,107.0000 | 52,427,000 | 0.00% | 0.00% |
| Feb. 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 500 | $30.35 | 86,108.0000 | 52,427,000 | 0.58% | 0.00% |
| Jan. 3, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Petersen Floyd F. | Director | S | Common Stock | 500 | $27.94 | 86,608.0000 | 52,427,000 | 0.57% | 0.00% |