Summary
Updated Aug 31, 2026
Sung Lee is EVP, Chief Financial Officer of CYTOKINETICS INC (CYTK). 12 SEC Form 4 filings on record going back to 2024, most recently on 2 July 2026. Most recent open-market trade: sold $98K of CYTK on 2 July 2026. Lifetime open-market sales: $2.51M.
Recent Transactions
20Every recent SEC Form 4 transaction Sung Lee has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Sung Lee go back to 2024: 12 primary Form 4 filings, an average of 4.0 per year. 15 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Sung Lee files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Third Rock Ventures IV, L.P. - $16.52M of TNGX open-market activity in the last 12 months
- Andrew Callos - $10.31M of CYTK open-market activity in the last 12 months
- Robert I. Blum - $9.70M of CYTK open-market activity in the last 12 months
- Adam Crystal - $5.72M of TNGX open-market activity in the last 12 months
- Fady Ibraham Malik - $4.35M of CYTK open-market activity in the last 12 months
- Edward M. Md Kaye - $3.54M of CYTK open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Sung Lee?
Sung Lee is a corporate insider, tracked as EVP, Chief Financial Officer of CYTOKINETICS INC (CYTK). InsiderAlpha holds 12 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Sung Lee submitted recently?
3 primary Form 4 filings in the last 90 days, covering 2 companies.
Has Sung Lee been buying or selling stock?
Recorded transactions: 0 open-market purchases and 4 open-market sales ($2.51M) across all tracked filings.
Where can I see all of Sung Lee's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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