13F Pro

SEC Form 4 reporting owner

Lee Sung

Lee Sung has filed 27 Form 4 transactions reported between December 3, 2025 and July 1, 2026, as EVP, Chief Financial Officer of CYTOKINETICS INC and a reporting owner of Tango Therapeutics, Inc..

Name as filed: Lee Sung

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$5.6M
4 lines
Companies
2
with Form 4 filings
Latest transaction
Jul 1, 2026
transaction date

Roles and reported holdings

  • CYTKCYTOKINETICS INC
    Dec 3, 2025 – Jul 1, 2026

    EVP, Chief Financial Officer

    Held directly63,221 sh as of Jun 29, 2026 · Form 4

    24 months: $5.6M sold

  • TNGXTango Therapeutics, Inc.
    Jan 2, 2026 – Jun 5, 2026

    Reporting owner

    No common-stock holding reported on a purchase, sale, gift or withholding line.

Transaction history

All 27 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Jul 1, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct1,112$54K@ $48.51Form 4
Jun 29, 2026CYTKEVP, Chief Financial OfficerOpen-market saleCode S · direct3,134$266K@ $85.00Form 4
Jun 29, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct823$37K@ $44.36Form 4
Jun 29, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct1,113$54K@ $48.51Form 4
Jun 29, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct822$36K@ $44.36Form 4
Jun 29, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct188$8K@ $44.36Form 4
Jun 24, 2026CYTKEVP, Chief Financial OfficerOpen-market saleCode S · direct38,730$3.2M@ $82.30Form 4
Jun 24, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct822$36K@ $44.36Form 4
Jun 24, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct188$8K@ $44.36Form 4
Jun 24, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct1,113$54K@ $48.51Form 4
Jun 24, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct2,817$125K@ $44.36Form 4
Jun 24, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct9,307$413K@ $44.36Form 4
Jun 24, 2026CYTKEVP, Chief Financial OfficerOption exerciseCode M · direct23,370$1.1M@ $48.51Form 4
Jun 5, 2026TNGXGrant or awardCode A · direct3,570—Form 4
Jun 5, 2026TNGXGrant or awardCode A · direct570—Form 4
May 5, 2026CYTKEVP, Chief Financial OfficerOpen-market saleCode S · direct23,906$1.8M@ $76.87Form 4
Apr 29, 2026TNGXGrant or awardCode A · direct5,200—Form 4
Apr 29, 2026TNGXGrant or awardCode A · direct12,300—Form 4
Mar 17, 2026CYTKEVP, Chief Financial OfficerOpen-market saleCode S · direct4,935$307K@ $62.15Form 4
Mar 15, 2026CYTKEVP, Chief Financial OfficerGrant or awardCode A · direct29,480—Form 4
Mar 15, 2026CYTKEVP, Chief Financial OfficerGrant or awardCode A · direct1,665—Form 4
Mar 15, 2026CYTKEVP, Chief Financial OfficerGrant or awardCode A · direct20,646—Form 4
Jan 2, 2026TNGXGrant or awardCode A · direct60,000—Form 4
Jan 2, 2026TNGXGrant or awardCode A · direct10,000—Form 4
Dec 22, 2025CYTKEVP, Chief Financial OfficerShares withheld for tax or exercise priceCode F · direct805$50K@ $62.72Form 4
Dec 22, 2025CYTKEVP, Chief Financial OfficerGrant or awardCode A · direct2,152—Form 4
Dec 3, 2025CYTKEVP, Chief Financial OfficerShares withheld for tax or exercise priceCode F · direct1,560$101K@ $65.02Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.