Sung Lee

CIK: 0001793200

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)5 (16.1%)

Position reduction

Option Exercises (M)13 (41.9%)

Derivative conversions

Awards (A)9 (29.0%)

Compensation grants

Other (G, F, J, C, D, …)4 (12.9%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (2)

CYTK

CYTOKINETICS INC

Officer

TNGX

Tango Therapeutics, Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (31 total)

CYTK
CYTOKINETICS INC
Jul 1, 2026
Exercise(M)
Direct
1.1K shares at avg. $48.51$54K
CYTK
CYTOKINETICS INC
Jul 1, 2026
Sale(S)
Direct
1.1K shares at avg. $87.79$98K
CYTK
CYTOKINETICS INC
Jun 29, 2026
Exercise(M)
Direct
822 shares at avg. $44.36$36K
CYTK
CYTOKINETICS INC
Jun 29, 2026
Exercise(M)
Direct
1.1K shares at avg. $48.51$54K
CYTK
CYTOKINETICS INC
Jun 29, 2026
Exercise(M)
Direct
188 shares at avg. $44.36$8K
CYTK
CYTOKINETICS INC
Jun 29, 2026
Exercise(M)
Direct
823 shares at avg. $44.36$37K
CYTK
CYTOKINETICS INC
Jun 29, 2026
Sale(S)
Direct
3.1K shares at avg. $85.00$266K
CYTK
CYTOKINETICS INC
Jun 29, 2026
Exercise(M)
Direct
188 shares at avg. $44.36$8K
CYTK
CYTOKINETICS INC
Jun 24, 2026
Exercise(M)
Direct
9.3K shares at avg. $44.36$413K
CYTK
CYTOKINETICS INC
Jun 24, 2026
Exercise(M)
Direct
2.8K shares at avg. $44.36$125K
CYTK
CYTOKINETICS INC
Jun 24, 2026
Exercise(M)
Direct
1.1K shares at avg. $48.51$54K
CYTK
CYTOKINETICS INC
Jun 24, 2026
Exercise(M)
Direct
188 shares at avg. $44.36$8K
CYTK
CYTOKINETICS INC
Jun 24, 2026
Exercise(M)
Direct
822 shares at avg. $44.36$36K
CYTK
CYTOKINETICS INC
Jun 24, 2026
Exercise(M)
Direct
1.1K shares at avg. $48.51$54K
CYTK
CYTOKINETICS INC
Jun 24, 2026
Sale(S)
Direct
38.7K shares at avg. $82.30$3.2M
CYTK
CYTOKINETICS INC
Jun 24, 2026
Exercise(M)
Direct
23.4K shares at avg. $48.51$1.1M
TNGX
Tango Therapeutics, Inc.
Jun 5, 2026
Award(A)
Direct
570 shares-
CYTK
CYTOKINETICS INC
May 5, 2026
Sale(S)
Direct
23.9K shares at avg. $76.87$1.8M
TNGX
Tango Therapeutics, Inc.
Apr 29, 2026
Award(A)
Direct
12.3K shares-
CYTK
CYTOKINETICS INC
Mar 17, 2026
Sale(S)
Direct
4.9K shares at avg. $62.15$307K
CYTK
CYTOKINETICS INC
Mar 15, 2026
Award(A)
Direct
20.6K shares-
TNGX
Tango Therapeutics, Inc.
Jan 2, 2026
Award(A)
Direct
10K shares-
CYTK
CYTOKINETICS INC
Dec 22, 2025
Award(A)
Direct
2.2K shares-
CYTK
CYTOKINETICS INC
Dec 22, 2025
Award(A)
Direct
2.2K shares-
CYTK
CYTOKINETICS INC
Dec 22, 2025
Tax Payment(F)
Direct
805 shares at avg. $62.72$50K

		Type	Shares	Price		Ownership
Jul 1, 2026	CYTK CYTOKINETICS INC	Exercise(M)	1,112	$48.51	$53,943	Direct
Jul 1, 2026	CYTK CYTOKINETICS INC	Sale(S)	1,112	$87.79	$97,622	Direct
Jun 29, 2026	CYTK CYTOKINETICS INC	Exercise(M)	822	$44.36	$36,464	Direct
Jun 29, 2026	CYTK CYTOKINETICS INC	Exercise(M)	1,113	$48.51	$53,992	Direct
Jun 29, 2026	CYTK CYTOKINETICS INC	Exercise(M)	188	$44.36	$8,340	Direct
Jun 29, 2026	CYTK CYTOKINETICS INC	Exercise(M)	823	$44.36	$36,508	Direct
Jun 29, 2026	CYTK CYTOKINETICS INC	Sale(S)	3,134	$85.00	$266,390	Direct
Jun 29, 2026	CYTK CYTOKINETICS INC	Exercise(M)	188	$44.36	$8,340	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Exercise(M)	9,307	$44.36	$412,859	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Exercise(M)	2,817	$44.36	$124,962	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Exercise(M)	1,113	$48.51	$53,992	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Exercise(M)	188	$44.36	$8,340	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Exercise(M)	822	$44.36	$36,464	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Exercise(M)	1,113	$48.51	$53,992	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Sale(S)	38,730	$82.30	$3,187,479	Direct
Jun 24, 2026	CYTK CYTOKINETICS INC	Exercise(M)	23,370	$48.51	$1,133,679	Direct
Jun 5, 2026	TNGX Tango Therapeutics, Inc.	Award(A)	570	-	$0	Direct
May 5, 2026	CYTK CYTOKINETICS INC	Sale(S)	23,906	$76.87	$1,837,654	Direct
Apr 29, 2026	TNGX Tango Therapeutics, Inc.	Award(A)	12,300	-	$0	Direct
Mar 17, 2026	CYTK CYTOKINETICS INC	Sale(S)	4,935	$62.15	$306,710	Direct
Mar 15, 2026	CYTK CYTOKINETICS INC	Award(A)	20,646	-	$0	Direct
Jan 2, 2026	TNGX Tango Therapeutics, Inc.	Award(A)	10,000	-	$0	Direct
Dec 22, 2025	CYTK CYTOKINETICS INC	Award(A)	2,152	-	-	Direct
Dec 22, 2025	CYTK CYTOKINETICS INC	Award(A)	2,152	-	-	Direct
Dec 22, 2025	CYTK CYTOKINETICS INC	Tax Payment(F)	805	$62.72	$50,490	Direct

1-25 of 31 transactions

About Lee Sung

Lee Sung (SEC CIK 0001793200) files insider reports with the SEC as EVP, Chief Financial Officer of CYTOKINETICS INC (CYTK) and Director of Tango Therapeutics, Inc. (TNGX).

Signal8 holds 15 ownership filings by Lee Sung (1 Form 3, 14 Form 4), filed between Dec 5, 2024 and Jul 2, 2026. Those filings report 31 transactions, from Dec 3, 2024 to Jul 1, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Lee Sung's filings is in SOUTH SAN FRANCISCO, CA.

Recent filings by Lee Sung

Jul 1, 2026: Option exercise of CYTK shares (Form 4, code M).
Jul 1, 2026: Open-market sale of CYTK shares (Form 4, code S).
Jun 29, 2026: Option exercises of CYTK shares (4 lines, Form 4, code M).
Jun 29, 2026: Open-market sale of CYTK shares (Form 4, code S).
Jun 29, 2026: Option exercise of CYTK shares (Form 4, code M).

Other insiders filing for CYTOKINETICS INC (CYTK)

Malik Fady Ibraham, EVP Research & Development
Blum Robert I, President & CEO
Wysenski Nancy, Director
Kaye Edward M. MD, Director
Harrington Robert Arthur, Director
Daly James M, Director

How to read Form 4 transaction codes