Lee Sung has filed 24 insider transactions across 3 companies since March 2023.
Most recent transaction: a sale of 4935 shares of CYTOKINETICS INC ($CYTK) on March 17, 2026.
Activity breakdown: 0 open-market purchases and 2 sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 17, 2026 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | S | Common Stock | 4935 | $62.15 | 87,127.0000 | 122,264,929 | 5.36% | 0.00% |
| March 15, 2026 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Incentive Stock Option (Right to Buy) | 1665 | $0.00 | 1,665.0000 | 122,264,929 | 9999.99% | 0.00% |
| March 15, 2026 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Non-Qualified Stock Option (Right to Buy) | 29480 | $0.00 | 29,480.0000 | 122,264,929 | 9999.99% | 0.02% |
| March 15, 2026 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Common Stock | 20646 | $0.00 | 92,062.0000 | 122,264,929 | 28.91% | 0.02% |
| Jan. 2, 2026 | Tango Therapeutics, Inc. | $TNGX | Lee Sung | Not found | A | Stock Option (Right to Buy) | 60000 | $0.00 | 60,000.0000 | 134,593,998 | 9999.99% | 0.04% |
| Jan. 2, 2026 | Tango Therapeutics, Inc. | $TNGX | Lee Sung | Not found | A | Common Stock | 10000 | $0.00 | 10,000.0000 | 134,593,998 | 9999.99% | 0.01% |
| Dec. 22, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Common Stock | 2152 | $0.00 | 72,221.0000 | 122,264,929 | 3.07% | 0.00% |
| Dec. 22, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | F | Common Stock | 805 | $62.72 | 71,416.0000 | 122,264,929 | 1.11% | 0.00% |
| Dec. 22, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Common Stock | 2152 | $0.00 | 70,069.0000 | 122,264,929 | 3.17% | 0.00% |
| Dec. 3, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | F | Common Stock | 1560 | $65.02 | 67,917.0000 | 122,264,929 | 2.25% | 0.00% |
| June 2, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | F | Common Stock | 4965 | $31.21 | 69,477.0000 | 118,410,689 | 6.67% | 0.00% |
| March 14, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Non-Qualified Stock Option (Right to Buy) | 41326 | $0.00 | 41,326.0000 | 118,410,689 | 9999.99% | 0.03% |
| March 14, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Common Stock | 32687 | $0.00 | 74,442.0000 | 118,410,689 | 78.28% | 0.03% |
| March 14, 2025 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Incentive Stock Option (Right to Buy) | 9016 | $0.00 | 9,016.0000 | 118,410,689 | 9999.99% | 0.01% |
| Dec. 3, 2024 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Common Stock | 4303 | $0.00 | 38,987.0000 | 0 | 12.41% | 0.00% |
| Dec. 3, 2024 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | F | Common Stock | 1536 | $51.51 | 37,451.0000 | 0 | 3.94% | 0.00% |
| Dec. 3, 2024 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Common Stock | 4304 | $0.00 | 41,755.0000 | 0 | 11.49% | 0.00% |
| May 31, 2024 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Non-Qualified Stock Option (Right to Buy) | 53417 | $0.00 | 53,417.0000 | 0 | 9999.99% | 0.00% |
| May 31, 2024 | CYTOKINETICS INC | $CYTK | Lee Sung | EVP, Chief Financial Officer | A | Common Stock | 34684 | $0.00 | 34,684.0000 | 0 | 9999.99% | 0.00% |
| March 27, 2024 | Vir Biotechnology, Inc. | $VIR | Lee Sung | EVP & Chief Financial Officer | S | Common Stock | 6008 | $9.89 | 100,492.0000 | 0 | 5.64% | 0.00% |
| Feb. 22, 2024 | Vir Biotechnology, Inc. | $VIR | Lee Sung | EVP & Chief Financial Officer | A | Stock Option (Right to Buy) | 80000 | $0.00 | 80,000.0000 | 0 | 9999.99% | 0.00% |
| Feb. 22, 2024 | Vir Biotechnology, Inc. | $VIR | Lee Sung | EVP & Chief Financial Officer | A | Common Stock | 40000 | $0.00 | 106,500.0000 | 0 | 60.15% | 0.00% |
| March 27, 2023 | Vir Biotechnology, Inc. | $VIR | Lee Sung | Chief Financial Officer | A | Stock Option (Right to Buy) | 133000 | $0.00 | 133,000.0000 | 0 | 9999.99% | 0.00% |
| March 27, 2023 | Vir Biotechnology, Inc. | $VIR | Lee Sung | Chief Financial Officer | A | Common Stock | 66500 | $0.00 | 66,500.0000 | 0 | 9999.99% | 0.00% |