SEC Insider Transactions from Lee Sung.

Last updated: 2026-03-18 23:01 UTC | Total transactions: 24

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.

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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%