Zhou Rong, Senior EVP of Production Center at Amphastar Pharmaceuticals ($AMPH), made one open market sale of company shares in the last year, totaling $256 thousand. The most recent transaction occurred on December 17, 2025. These sales rank 7,898th among 11,678 individual insiders, well below the average of $8.6 million per insider and 6.4 transactions. Zhou Rong reported 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 15, 2026 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 1225 | $18.18 | 276,222.0000 | 48,215,000 | 0.44% | 0.00% |
| March 10, 2026 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 2215 | $18.91 | 277,447.0000 | 48,215,000 | 0.79% | 0.00% |
| March 9, 2026 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | A | Employee Stock Option (right to buy) | 81341 | $0.00 | 81,341.0000 | 48,215,000 | 9999.99% | 0.17% |
| March 9, 2026 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | A | Common Srock | 39432 | $0.00 | 174,994.0000 | 48,215,000 | 29.09% | 0.08% |
| March 6, 2026 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 1357 | $19.34 | 240,230.0000 | 48,215,000 | 0.56% | 0.00% |
| March 4, 2026 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 1124 | $19.96 | 241,587.0000 | 48,215,000 | 0.46% | 0.00% |
| Dec. 17, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | S | Common Stock | 9787 | $26.20 | 242,711.0000 | 47,677,000 | 3.88% | 0.02% |
| Dec. 17, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Common Stock | 9787 | $11.33 | 252,498.0000 | 47,677,000 | 4.03% | 0.02% |
| Dec. 17, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Employee Stock Option (right to buy) | 9787 | $0.00 | 0.0000 | 47,677,000 | 100.00% | 0.02% |
| March 17, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Srock | 1967 | $27.69 | 137,497.0000 | 52,058,000 | 1.41% | 0.00% |
| March 15, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 1222 | $26.66 | 244,132.0000 | 52,058,000 | 0.50% | 0.00% |
| March 10, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | A | Common Srock | 24692 | $0.00 | 140,686.0000 | 52,058,000 | 21.29% | 0.05% |
| March 10, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | A | Employee Stock Option (right to buy) | 52437 | $0.00 | 52,437.0000 | 52,058,000 | 9999.99% | 0.10% |
| March 6, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 1354 | $28.32 | 220,662.0000 | 52,058,000 | 0.61% | 0.00% |
| March 4, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 1121 | $27.62 | 222,016.0000 | 52,058,000 | 0.50% | 0.00% |
| Dec. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Common Stock | 7000 | $11.33 | 230,137.0000 | 51,862,000 | 3.14% | 0.01% |
| Dec. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | S | Common Stock | 7000 | $44.43 | 223,137.0000 | 51,862,000 | 3.04% | 0.01% |
| Dec. 13, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Common Stock | 8000 | $11.33 | 231,137.0000 | 51,862,000 | 3.59% | 0.02% |
| Dec. 13, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | S | Common Stock | 8000 | $45.23 | 223,137.0000 | 51,862,000 | 3.46% | 0.02% |
| Dec. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Employee Stock Option (right to buy) | 7000 | $0.00 | 17,787.0000 | 51,862,000 | 28.24% | 0.01% |
| Dec. 13, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Employee Stock Option (right to buy) | 8000 | $0.00 | 9,787.0000 | 51,862,000 | 44.98% | 0.02% |
| Nov. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Employee Stock Option (right to buy) | 6893 | $0.00 | 0.0000 | 51,862,000 | 100.00% | 0.01% |
| Nov. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Common Stock | 6893 | $14.95 | 229,949.0000 | 51,862,000 | 3.09% | 0.01% |
| Nov. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | S | Common Stock | 6893 | $48.88 | 223,056.0000 | 51,862,000 | 3.00% | 0.01% |
| Sept. 13, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | S | Common Srock | 3000 | $48.26 | 118,388.0000 | 52,046,000 | 2.47% | 0.01% |
| Sept. 13, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Common Srock | 3000 | $14.95 | 121,388.0000 | 52,046,000 | 2.53% | 0.01% |
| Sept. 13, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Employee Stock Option (right to buy) | 3000 | $0.00 | 6,893.0000 | 52,046,000 | 30.32% | 0.01% |
| Aug. 26, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Common Srock | 4000 | $14.95 | 122,388.0000 | 52,046,000 | 3.38% | 0.01% |
| Aug. 26, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | S | Common Srock | 4000 | $48.35 | 118,388.0000 | 52,046,000 | 3.27% | 0.01% |
| Aug. 26, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | M | Employee Stock Option (right to buy) | 4000 | $0.00 | 9,893.0000 | 52,046,000 | 28.79% | 0.01% |
| March 15, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Srock | 1219 | $43.05 | 122,332.0000 | 53,001,000 | 0.99% | 0.00% |
| March 17, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Stock | 1961 | $43.05 | 222,684.0000 | 53,001,000 | 0.87% | 0.00% |
| March 16, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Srock | 2355 | $43.05 | 119,977.0000 | 53,001,000 | 1.93% | 0.00% |
| March 6, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | F | Common Srock | 1390 | $46.31 | 123,551.0000 | 53,001,000 | 1.11% | 0.00% |
| March 4, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | A | Common Srock | 12521 | $0.00 | 124,941.0000 | 53,001,000 | 11.14% | 0.02% |
| March 4, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | A | Employee Stock Option (right to buy) | 26378 | $0.00 | 26,378.0000 | 53,001,000 | 9999.99% | 0.05% |
| Dec. 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | Senior EVP, Production Center | M | Common Stock | 4316 | $14.40 | 221,404.0000 | 53,921,000 | 1.99% | 0.01% |
| Dec. 4, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | Senior EVP, Production Center | M | Common Stock | 3514 | $16.19 | 220,602.0000 | 53,921,000 | 1.62% | 0.01% |
| Dec. 4, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | Senior EVP, Production Center | S | Common Stock | 3514 | $59.58 | 217,088.0000 | 53,921,000 | 1.59% | 0.01% |
| Dec. 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | Senior EVP, Production Center | M | Employee Stock Option (right to buy) | 4316 | $0.00 | 0.0000 | 53,921,000 | 100.00% | 0.01% |
| Dec. 4, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | Senior EVP, Production Center | M | Employee Stock Option (right to buy) | 3514 | $0.00 | 0.0000 | 53,921,000 | 100.00% | 0.01% |
| Dec. 1, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | Senior EVP, Production Center | S | Common Stock | 4316 | $58.58 | 217,088.0000 | 53,921,000 | 1.95% | 0.01% |
| June 20, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Employee Stock Option (right to buy) | 9651 | $0.00 | 24,787.0000 | 51,970,000 | 28.02% | 0.02% |
| June 20, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Common Stock | 9651 | $11.33 | 217,009.0000 | 51,970,000 | 4.65% | 0.02% |
| June 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Common Stock | 13575 | $14.40 | 206,556.0000 | 51,970,000 | 7.03% | 0.03% |
| June 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | S | Common Stock | 5000 | $51.79 | 201,556.0000 | 51,970,000 | 2.42% | 0.01% |
| June 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Common Stock | 4631 | $14.95 | 206,187.0000 | 51,970,000 | 2.30% | 0.01% |
| June 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Common Stock | 1171 | $16.19 | 207,358.0000 | 51,970,000 | 0.57% | 0.00% |
| June 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Employee Stock Option (right to buy) | 13575 | $0.00 | 4,316.0000 | 51,970,000 | 75.88% | 0.03% |
| June 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Employee Stock Option (right to buy) | 4631 | $0.00 | 13,893.0000 | 51,970,000 | 25.00% | 0.01% |
| June 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Employee Stock Option (right to buy) | 1171 | $0.00 | 3,514.0000 | 51,970,000 | 24.99% | 0.00% |
| June 13, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Employee Stock Option (right to buy) | 5000 | $0.00 | 17,891.0000 | 51,970,000 | 21.84% | 0.01% |
| June 13, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Common Stock | 5000 | $14.40 | 197,981.0000 | 51,970,000 | 2.59% | 0.01% |
| June 13, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | S | Common Stock | 5000 | $48.24 | 192,981.0000 | 51,970,000 | 2.53% | 0.01% |
| May 18, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Employee Stock Option (right to buy) | 10000 | $0.00 | 22,891.0000 | 51,970,000 | 30.40% | 0.02% |
| May 18, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | S | Common Stock | 10000 | $44.21 | 192,266.0000 | 51,970,000 | 4.94% | 0.02% |
| May 18, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | M | Common Stock | 10000 | $14.40 | 202,266.0000 | 51,970,000 | 5.20% | 0.02% |
| March 17, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | F | Common Stock | 1901 | $36.29 | 192,266.0000 | 52,427,000 | 0.98% | 0.00% |
| March 16, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | F | Common Stock | 2283 | $37.60 | 194,167.0000 | 52,427,000 | 1.16% | 0.00% |
| March 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | F | Common Stock | 2057 | $36.84 | 196,450.0000 | 52,427,000 | 1.04% | 0.00% |
| March 6, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | A | Employee Stock Option (right to buy) | 31882 | $0.00 | 31,882.0000 | 52,427,000 | 9999.99% | 0.06% |
| March 6, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | Zhou Rong | EVP, Production Center | A | Common Stock | 15129 | $0.00 | 198,507.0000 | 52,427,000 | 8.25% | 0.03% |