Transactions
38
Insider / CYTOKINETICS INC
Lee Sung
EVP, Chief Financial Officer at CYTOKINETICS INC
- Company
- CYTOKINETICS INC
- Ticker
- CYTK
- First filing on record
- December 5, 2025
- Latest trade on record
- July 1, 2026
- SEC filings
- EDGAR ↗
Lee Sung, EVP, Chief Financial Officer at CYTOKINETICS INC, has disclosed 38 transactions in CYTK since December 5, 2025: 0 purchases (0 open-market buys) and 7 sales, worth about $7.9M at the reported prices. The latest was filed July 2, 2026, 1 day after the trade; 18 filings were late against the 2-business-day Form 4 deadline.
Open-market buys
0
Sales
7
Avg. disclosure lag
2.8d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Lee Sung made no purchases and 7 sales worth $5.8M, plus 31 other transactions. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Lee Sung has traded 1 stock on record; the largest by dollars is CYTK.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
2 of 8 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| M | Option exercise or conversion | 26 | 85,952 | $2.0M |
| A | Grant or award | 5 | 56,095 | — |
| S | Open-market sale | 5 | 71,817 | $5.7M |
| F | Shares withheld for tax | 2 | 2,365 | $152K |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 34 | 0 | 5 · $5.7M |
| 2025 | 4 | 0 | 2 · $152K |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| CYTK | Option / conversion M | July 1, 2026 | July 2, 2026 | 1d | 1,112 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Sell S | July 1, 2026 | July 2, 2026 | 1d | 1,112 | $88 | $98K | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | July 1, 2026 | July 2, 2026 | 1d | 1,112 | $49 | $54K | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 1,113 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 822 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 188 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 1,113 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 2,817 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 9,307 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 23,370 | — | — | late10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Sell S | June 24, 2026 | June 29, 2026 | 5d | 38,730 | $82 | $3.2M | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 1,113 | $49 | $54K | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 822 | $44 | $36K | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 188 | $44 | $8,340 | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 1,113 | $49 | $54K | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 2,817 | $44 | $125K | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 9,307 | $44 | $413K | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 24, 2026 | June 29, 2026 | 5d | 23,370 | $49 | $1.1M | late10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 823 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 188 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 1,113 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 822 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 188 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| CYTK | Sell S | June 29, 2026 | June 29, 2026 | 0d | 3,134 | $85 | $266K | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 823 | $44 | $37K | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 188 | $44 | $8,340 | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 1,113 | $49 | $54K | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 822 | $44 | $36K | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Option / conversion M | June 29, 2026 | June 29, 2026 | 0d | 188 | $44 | $8,340 | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Sell S | May 5, 2026 | May 5, 2026 | 0d | 23,906 | $77 | $1.8M | 10b5-1 plan | Form 4 ↗ | |
| CYTK | Sell S | March 17, 2026 | March 18, 2026 | 1d | 4,935 | $62 | $307K | Form 4 ↗ | ||
| CYTK | Other A | March 15, 2026 | March 17, 2026 | 2d | 29,480 | — | — | derivative | Form 4 ↗ | |
| CYTK | Other A | March 15, 2026 | March 17, 2026 | 2d | 1,665 | — | — | derivative | Form 4 ↗ | |
| CYTK | Other A | March 15, 2026 | March 17, 2026 | 2d | 20,646 | — | — | Form 4 ↗ | ||
| CYTK | Sell F | December 22, 2025 | December 29, 2025 | 7d | 805 | $63 | $50K | late | Form 4 ↗ | |
| CYTK | Other A | December 22, 2025 | December 29, 2025 | 7d | 2,152 | — | — | late | Form 4 ↗ | |
| CYTK | Other A | December 22, 2025 | December 29, 2025 | 7d | 2,152 | — | — | late | Form 4 ↗ | |
| CYTK | Sell F | December 3, 2025 | December 5, 2025 | 2d | 1,560 | $65 | $101K | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| July 2, 2026 | Form 4 | 0001061983-26-000072 | 3 | published | EDGAR ↗ |
| June 29, 2026 | Form 4 | 0001061983-26-000070 | 11 | published | EDGAR ↗ |
| June 29, 2026 | Form 4 | 0001061983-26-000071 | 15 | published | EDGAR ↗ |
| May 5, 2026 | Form 4 | 0001061983-26-000049 | 1 | published | EDGAR ↗ |
| March 18, 2026 | Form 4 | 0001061983-26-000029 | 1 | published | EDGAR ↗ |
| March 17, 2026 | Form 4 | 0001061983-26-000021 | 3 | published | EDGAR ↗ |
| December 29, 2025 | Form 4 | 0001061983-25-000053 | 3 | published | EDGAR ↗ |
| December 5, 2025 | Form 4 | 0001061983-25-000046 | 1 | published | EDGAR ↗ |
Other insiders at CYTOKINETICS INC
- Callos Andrew EVP, Chief Commercial Officer 71 rows
- Malik Fady Ibraham EVP Research & Development 70 rows
- Blum Robert I President & CEO 52 rows
- Kaye Edward M. MD Director 17 rows
- WIERENGA WENDELL Director 16 rows
- HENDERSON JOHN T Director 13 rows
- Daly James M Director 8 rows
- Harrington Robert Arthur Director 8 rows
- Wysenski Nancy Director 7 rows
- PARSHALL B LYNNE Director 6 rows
Everyone on file, with contracts and lobbying under the company's name: CYTOKINETICS INC.
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Rule 10b5-1 trading plans The plan must be set up when the insider has no important non-public information.
- Options and derivatives on Form 4 Table I = shares. Table II = options and other derivatives.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 8 | 38 | December 5, 2025 | July 2, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.