Richard K. Prins sold Amphastar Pharmaceuticals ($AMPH) shares once on the open market in the last year for a total of $113 thousand. His most recent sale occurred on November 25, 2025. This places him 9,388th out of 11,678 insiders by sale value, well below the average of $8.6 million per insider across 6.37 transactions. Prins made no open market purchases in the period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 19, 2026 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 100000 | $0.00 | 1,371,251.0000 | 90,457,910 | 7.87% | 0.11% |
| Jan. 19, 2026 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 100000 | $0.00 | 50,000.0000 | 90,457,910 | 66.67% | 0.11% |
| Nov. 25, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Stock Option (right to buy) | 4179 | $0.00 | 0.0000 | 47,677,000 | 100.00% | 0.01% |
| Nov. 25, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Common Stock | 4179 | $16.69 | 39,362.0000 | 47,677,000 | 11.88% | 0.01% |
| Nov. 25, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | S | Common Stock | 4179 | $27.10 | 35,183.0000 | 47,677,000 | 10.62% | 0.01% |
| Oct. 17, 2025 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | A | Options | 750000 | $0.00 | 750,000.0000 | 90,457,910 | 9999.99% | 0.83% |
| June 2, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | A | Common Stock | 5122 | $0.00 | 35,183.0000 | 49,890,000 | 17.04% | 0.01% |
| June 2, 2025 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | A | Stock Option (right to buy) | 11402 | $0.00 | 11,402.0000 | 49,890,000 | 9999.99% | 0.02% |
| March 31, 2025 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 100000 | $0.00 | 1,201,251.0000 | 77,633,004 | 9.08% | 0.13% |
| March 31, 2025 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 70000 | $0.00 | 1,271,251.0000 | 77,633,004 | 5.83% | 0.09% |
| March 31, 2025 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 100000 | $0.00 | 100,000.0000 | 77,633,004 | 50.00% | 0.13% |
| March 31, 2025 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 70000 | $0.00 | 140,000.0000 | 77,633,004 | 33.33% | 0.09% |
| March 31, 2025 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 58333 | $0.00 | 0.0000 | 77,633,004 | 100.00% | 0.08% |
| March 31, 2025 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 58333 | $0.00 | 1,101,251.0000 | 77,633,004 | 5.59% | 0.08% |
| Dec. 9, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | S | Common Stock | 10000 | $43.77 | 30,471.0000 | 51,862,000 | 24.71% | 0.02% |
| Dec. 9, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Stock Option (right to buy) | 10000 | $0.00 | 0.0000 | 51,862,000 | 100.00% | 0.02% |
| Dec. 9, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Common Stock | 10000 | $19.52 | 40,471.0000 | 51,862,000 | 32.82% | 0.02% |
| Dec. 9, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | G | Common Stock | 410 | $0.00 | 30,061.0000 | 51,862,000 | 1.35% | 0.00% |
| Nov. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Stock Option (right to buy) | 2500 | $0.00 | 4,179.0000 | 51,862,000 | 37.43% | 0.00% |
| Nov. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Common Stock | 2500 | $16.69 | 36,471.0000 | 51,862,000 | 7.36% | 0.00% |
| Nov. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | S | Common Stock | 5000 | $48.80 | 31,471.0000 | 51,862,000 | 13.71% | 0.01% |
| Nov. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | G | Common Stock | 1000 | $0.00 | 30,471.0000 | 51,862,000 | 3.18% | 0.00% |
| Aug. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | S | Common Stock | 17101 | $43.07 | 33,971.0000 | 52,046,000 | 33.48% | 0.03% |
| Aug. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Stock Option (right to buy) | 6004 | $0.00 | 10,000.0000 | 52,046,000 | 37.52% | 0.01% |
| Aug. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Stock Option (right to buy) | 7182 | $0.00 | 10,000.0000 | 52,046,000 | 41.80% | 0.01% |
| Aug. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Common Stock | 6004 | $20.08 | 43,890.0000 | 52,046,000 | 15.85% | 0.01% |
| Aug. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Common Stock | 7182 | $19.52 | 51,072.0000 | 52,046,000 | 16.36% | 0.01% |
| Aug. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Stock Option (right to buy) | 3915 | $0.00 | 10,000.0000 | 52,046,000 | 28.14% | 0.01% |
| Aug. 12, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Not found | M | Common Stock | 3915 | $20.03 | 37,886.0000 | 52,046,000 | 11.52% | 0.01% |
| Aug. 12, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | G | Common Stock | 200000 | $0.00 | 1,042,917.0000 | 72,813,538 | 16.09% | 0.27% |
| June 3, 2024 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | 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 | PRINS RICHARD K | Not found | A | Common Stock | 3076 | $0.00 | 33,971.0000 | 53,013,000 | 9.96% | 0.01% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 100000 | $0.00 | 200,000.0000 | 63,725,084 | 33.33% | 0.16% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 100000 | $0.00 | 1,013,334.0000 | 63,725,084 | 10.95% | 0.16% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 58333 | $0.00 | 1,071,667.0000 | 63,725,084 | 5.76% | 0.09% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 100000 | $0.00 | 1,171,667.0000 | 63,725,084 | 9.33% | 0.16% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 42750 | $0.00 | 1,214,417.0000 | 63,725,084 | 3.65% | 0.07% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Common Stock | 28500 | $0.00 | 1,242,917.0000 | 63,725,084 | 2.35% | 0.04% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 100000 | $0.00 | 100,000.0000 | 63,725,084 | 50.00% | 0.16% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 58333 | $0.00 | 58,333.0000 | 63,725,084 | 50.00% | 0.09% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | M | Restricted Stock Units | 71250 | $0.00 | 213,750.0000 | 63,725,084 | 25.00% | 0.11% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | A | Restricted Stock Units | 210000 | $0.00 | 210,000.0000 | 63,725,084 | 9999.99% | 0.33% |
| March 13, 2024 | IGC Pharma, Inc. | $IGC | PRINS RICHARD K | Director | A | Restricted Stock Units | 175000 | $0.00 | 175,000.0000 | 63,725,084 | 9999.99% | 0.27% |
| Nov. 17, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | G | Common Stock | 1000 | $0.00 | 30,895.0000 | 53,921,000 | 3.14% | 0.00% |
| Nov. 17, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | S | Common Stock | 4000 | $55.86 | 31,895.0000 | 53,921,000 | 11.14% | 0.01% |
| Nov. 13, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | S | Common Stock | 5000 | $52.50 | 35,895.0000 | 53,921,000 | 12.23% | 0.01% |
| Aug. 18, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | S | Common Stock | 2000 | $52.50 | 40,895.0000 | 53,102,000 | 4.66% | 0.00% |
| Aug. 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | S | Common Stock | 4163 | $57.39 | 42,895.0000 | 53,102,000 | 8.85% | 0.01% |
| June 5, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | A | Common Stock | 2716 | $0.00 | 47,058.0000 | 51,970,000 | 6.13% | 0.01% |
| June 5, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | A | Stock Option (right to buy) | 7016 | $0.00 | 7,016.0000 | 51,970,000 | 9999.99% | 0.01% |
| May 12, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | G | Common Stock | 3000 | $0.00 | 44,342.0000 | 51,970,000 | 6.34% | 0.01% |
| May 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | M | Common Stock | 5000 | $16.69 | 49,342.0000 | 51,970,000 | 11.28% | 0.01% |
| May 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | S | Common Stock | 5000 | $43.50 | 44,342.0000 | 51,970,000 | 10.13% | 0.01% |
| May 12, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | M | Stock option (right to buy) | 5000 | $0.00 | 11.6790 | 51,970,000 | 99.77% | 0.01% |
| May 15, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | M | Stock option (right to buy) | 5000 | $0.00 | 6,679.0000 | 51,970,000 | 42.81% | 0.01% |
| May 12, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | S | Common Stock | 5000 | $42.06 | 47,342.0000 | 51,970,000 | 9.55% | 0.01% |
| May 12, 2023 | Amphastar Pharmaceuticals, Inc. | $AMPH | PRINS RICHARD K | Director | M | Common Stock | 5000 | $16.69 | 52,342.0000 | 51,970,000 | 10.56% | 0.01% |