Stein Jeffrey bought IDEAYA Biosciences ($IDYA) shares once on the open market in the last year, totaling $1.65 million, with the latest purchase on March 2, 2026. This ranks him 365th among 4,983 insiders by purchase value, above the average of $1.46 million across 3.29 transactions per insider. He made no open market sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 2, 2026 | IDEAYA Biosciences, Inc. | $IDYA | Stein Jeffrey | Not found | P | Common Stock | 50000 | $32.96 | 61,007.0000 | 88,485,238 | 454.26% | 0.06% |
| Nov. 10, 2020 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | J | Common Stock | 2500 | $40.01 | 75,640.0000 | 0 | 3.20% | 0.00% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 16499 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.05% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 27174 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.09% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 51999 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.17% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 560888 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 1.78% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 275000 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.87% |
| May 23, 2016 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | J | Common Stock | 270 | $0.00 | 79,902.0000 | 0 | 0.34% | 0.00% |
| March 31, 2017 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | J | Common Stock | 645 | $155.00 | 79,257.0000 | 0 | 0.81% | 0.00% |
| March 31, 2017 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | P | Common Stock | 645 | $155.00 | 73,896.0000 | 0 | 0.88% | 0.00% |
| June 5, 2017 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | J | Common Stock | 750 | $118.95 | 78,507.0000 | 0 | 0.95% | 0.00% |
| June 5, 2017 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | P | Common Stock | 750 | $118.95 | 74,646.0000 | 0 | 1.01% | 0.00% |
| Sept. 12, 2017 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | J | Common Stock | 367 | $135.80 | 78,140.0000 | 0 | 0.47% | 0.00% |
| Sept. 12, 2017 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | P | Common Stock | 367 | $135.80 | 75,013.0000 | 0 | 0.49% | 0.00% |
| Nov. 10, 2020 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | P | Common Stock | 2500 | $40.01 | 77,513.0000 | 0 | 3.33% | 0.00% |
| Dec. 10, 2020 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | J | Common Stock | 658 | $0.00 | 74,703.0000 | 0 | 0.87% | 0.00% |
| Dec. 31, 2021 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 1873 | $0.00 | 75,640.0000 | 0 | 2.42% | 0.00% |
| Dec. 31, 2021 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 937 | $0.00 | 75,640.0000 | 0 | 1.25% | 0.00% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Common Stock | 5763 | $221.50 | 0.0000 | 31,439,371 | 100.00% | 0.02% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Common Stock | 2379 | $221.50 | 0.0000 | 31,439,371 | 100.00% | 0.01% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Common Stock | 67498 | $221.50 | 0.0000 | 31,439,371 | 100.00% | 0.21% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 7949 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.03% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 11000 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.03% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 11749 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.04% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 13249 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.04% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 16499 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.05% |
| Jan. 7, 2026 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | D | Employee Stock Option (right to buy) | 26249 | $0.00 | 0.0000 | 31,439,371 | 100.00% | 0.08% |
| Dec. 10, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 33072 | $0.00 | 90,336.0000 | 31,439,371 | 26.80% | 0.11% |
| Dec. 22, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 5425 | $0.00 | 77,504.0000 | 31,439,371 | 6.54% | 0.02% |
| Dec. 19, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 10638 | $0.00 | 82,929.0000 | 31,439,371 | 14.72% | 0.03% |
| Dec. 19, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 10638 | $0.00 | 77,504.0000 | 31,439,371 | 12.07% | 0.03% |
| Dec. 17, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 2244 | $0.00 | 72,291.0000 | 31,439,371 | 3.20% | 0.01% |
| Dec. 17, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 2244 | $0.00 | 88,092.0000 | 31,439,371 | 2.48% | 0.01% |
| Dec. 10, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | G | Common Stock | 33072 | $0.00 | 70,047.0000 | 31,439,371 | 89.44% | 0.11% |
| Dec. 10, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | F | Common Stock | 2285 | $219.60 | 82,879.0000 | 31,439,371 | 2.68% | 0.01% |
| June 24, 2025 | IDEAYA Biosciences, Inc. | $IDYA | Stein Jeffrey | Not found | A | Stock Option (right to buy) | 20000 | $0.00 | 20,000.0000 | 81,678,069 | 9999.99% | 0.02% |
| March 31, 2025 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | A | Employee Stock Option (right to buy) | 275000 | $0.00 | 275,000.0000 | 10,953,490 | 9999.99% | 2.51% |
| Sept. 30, 2024 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | A | Employee Stock Option (right to buy) | 560888 | $0.00 | 560,888.0000 | 0 | 9999.99% | 0.00% |
| June 7, 2024 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | P | Common Stock | 8000 | $13.21 | 84,564.0000 | 0 | 10.45% | 0.00% |
| May 31, 2024 | IDEAYA Biosciences, Inc. | $IDYA | Stein Jeffrey | Not found | A | Stock Option (right to buy) | 16200 | $0.00 | 16,200.0000 | 57,519,929 | 9999.99% | 0.03% |
| March 15, 2024 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | A | Employee Stock Option (right to buy) | 1040000 | $0.00 | 1,040,000.0000 | 0 | 9999.99% | 0.00% |
| March 11, 2024 | Cidara Therapeutics, Inc. | $CDTX | Stein Jeffrey | President & CEO | F | Common Stock | 56692 | $0.69 | 1,527,304.0000 | 0 | 3.58% | 0.00% |
| June 7, 2023 | IDEAYA Biosciences, Inc. | $IDYA | Stein Jeffrey | Not found | A | Stock Option (right to buy) | 16200 | $0.00 | 16,200.0000 | 41,444,696 | 9999.99% | 0.04% |