Blum Robert I
Director · Officer · CYTK
As of 2026-09-16, Blum Robert I has 69 Form 4 transactions on record across 1 company — 46 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in September in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $10.9M
- Indirect $0
| CYTK | direct | 156,745 sh | $10.9M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-15 | CYTK | Sale | 97,926 @ $69.33 | $6.8M | −100.0% of holding | 0 | Form 4 |
| 2026-09-14 | CYTK | Sale | 7,500 @ $73.44 | $551K | −1.9% of holding | 377,820 | Form 4 |
| 2026-08-31 | CYTK | Sale | 7,500 @ $70.24 | $527K | −1.9% of holding | 377,820 | Form 4 |
| 2026-08-10 | CYTK | Sale | 7,500 @ $76.76 | $576K | −1.9% of holding | 377,820 | Form 4 |
| 2026-07-27 | CYTK | Sale | 7,500 @ $80.87 | $607K | −1.9% of holding | 377,820 | Form 4 |
| 2026-07-13 | CYTK | Sale | 7,490 @ $82.02 | $614K | −1.9% of holding | 377,820 | Form 4 |
| 2026-07-13 | CYTK | Sale | 10 @ $82.02 | $820 | −0.0% of holding | 377,820 | Form 4 |
| 2026-07-01 | CYTK | Sale | 7,500 @ $84.92 | $637K | −1.9% of holding | 377,830 | Form 4 |
| 2026-06-15 | CYTK | Sale | 7,500 @ $70.46 | $528K | −1.9% of holding | 385,330 | Form 4 |
| 2026-05-27 | CYTK | Sale | 7,500 @ $77.21 | $579K | −1.9% of holding | 392,830 | Form 4 |
| 2026-05-14 | CYTK | Sale | 7,500 @ $77.92 | $584K | −1.8% of holding | 400,330 | Form 4 |
| 2026-04-29 | CYTK | Sale | 7,500 @ $59.62 | $447K | −1.8% of holding | 407,830 | Form 4 |
| 2026-04-15 | CYTK | Sale | 7,500 @ $65.38 | $490K | −1.8% of holding | 415,330 | Form 4 |
| 2026-04-01 | CYTK | Sale | 7,500 @ $66.63 | $500K | −1.7% of holding | 422,830 | Form 4 |
| 2026-03-17 | CYTK | Sale | 23,928 @ $62.15 | $1.5M | −5.3% of holding | 430,330 | Form 4 |
| 2026-03-17 | CYTK | Sale | 12,673 @ $62.15 | $788K | −2.7% of holding | 454,258 | Form 4 |
| 2026-03-09 | CYTK | Sale | 7,931 @ $60.72 | $482K | −2.0% of holding | 391,673 | Form 4 |
| 2025-10-30 | CYTK | Sale | 5,000 @ $62.86 | $314K | −1.4% of holding | 358,108 | Form 4 |
| 2025-10-16 | CYTK | Sale | 5,000 @ $60.03 | $300K | −1.4% of holding | 363,108 | Form 4 |
| 2025-10-01 | CYTK | Sale | 5,000 @ $55.05 | $275K | −1.3% of holding | 368,108 | Form 4 |
| 2025-09-15 | CYTK | Sale | 5,000 @ $49.77 | $249K | −1.3% of holding | 373,108 | Form 4 |
| 2025-09-02 | CYTK | Sale | 5,000 @ $48.76 | $244K | −1.3% of holding | 378,108 | Form 4 |
| 2025-08-15 | CYTK | Sale | 5,000 @ $38.42 | $192K | −1.3% of holding | 383,108 | Form 4 |
| 2025-07-29 | CYTK | Sale | 5,000 @ $36.45 | $182K | −1.3% of holding | 388,108 | Form 4 |
| 2025-07-14 | CYTK | Sale | 5,000 @ $38.15 | $191K | −1.3% of holding | 393,108 | Form 4 |
| 2025-07-01 | CYTK | Sale | 5,000 @ $33.55 | $168K | −1.2% of holding | 398,108 | Form 4 |
| 2025-06-16 | CYTK | Sale | 5,000 @ $33.80 | $169K | −1.2% of holding | 403,108 | Form 4 |
| 2025-06-02 | CYTK | Sale | 5,000 @ $31.22 | $156K | −1.2% of holding | 408,108 | Form 4 |
| 2025-05-16 | CYTK | Sale | 5,000 @ $30.93 | $155K | −1.2% of holding | 412,629 | Form 4 |
| 2025-04-29 | CYTK | Sale | 5,000 @ $40.96 | $205K | −1.2% of holding | 417,629 | Form 4 |
| 2025-04-10 | CYTK | Sale | 5,000 @ $36.77 | $184K | −1.2% of holding | 422,629 | Form 4 |
| 2025-03-31 | CYTK | Sale | 15,000 @ $40.75 | $611K | −3.4% of holding | 427,629 | Form 4 |
| 2025-03-17 | CYTK | Sale | 25,000 @ $44.65 | $1.1M | −6.9% of holding | 339,181 | Form 4 |
| 2025-03-17 | CYTK | Sale | 12,648 @ $44.38 | $561K | −3.7% of holding | 326,533 | Form 4 |
| 2025-03-06 | CYTK | Sale | 16,970 @ $43.44 | $737K | −4.5% of holding | 364,181 | Form 4 |
| 2025-03-05 | CYTK | Sale | 25,000 @ $43.23 | $1.1M | −6.2% of holding | 381,151 | Form 4 |
| 2025-03-03 | CYTK | Sale | 8,743 @ $42.88 | $375K | −2.1% of holding | 406,151 | Form 4 |
32 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-09-14 | CYTK | Option exercise | 7,500 | 385,320 | Form 4 |
| 2026-09-14 | CYTK | Gift | 97,926 | 278,544 | Form 4 |
| 2026-09-14 | CYTK | Option exercise | 7,500 | 156,745 | Form 4 |
| 2026-09-14 | CYTK | Gift | 1,350 | 376,470 | Form 4 |
| 2026-09-14 | CYTK | Gift | 97,926 | 97,926 | Form 4 |
| 2026-08-31 | CYTK | Option exercise | 7,500 | 385,320 | Form 4 |
| 2026-08-31 | CYTK | Option exercise | 7,500 | 164,245 | Form 4 |
| 2026-08-10 | CYTK | Option exercise | 7,500 | 385,320 | Form 4 |
| 2026-08-10 | CYTK | Option exercise | 7,500 | 171,745 | Form 4 |
| 2026-07-27 | CYTK | Option exercise | 7,500 | 385,320 | Form 4 |
| 2026-07-27 | CYTK | Option exercise | 7,500 | 179,245 | Form 4 |
| 2026-07-13 | CYTK | Option exercise | 7,490 | 385,310 | Form 4 |
| 2026-07-13 | CYTK | Option exercise | 7,490 | 186,745 | Form 4 |
| 2026-03-15 | CYTK | Award / grant | 75,258 | 466,931 | Form 4 |
| 2026-03-15 | CYTK | Award / grant | 1,665 | 1,665 | Form 4 |
| 2026-03-15 | CYTK | Award / grant | 111,864 | 111,864 | Form 4 |
| 2025-12-22 | CYTK | Withheld for tax | 30,426 | 374,503 | Form 4 |
| 2025-12-22 | CYTK | Option exercise | 54,727 | 404,929 | Form 4 |
| 2025-12-22 | CYTK | Withheld for tax | 2,935 | 399,604 | Form 4 |
| 2025-12-22 | CYTK | Option exercise | 16,506 | 391,009 | Form 4 |
| 2025-12-22 | CYTK | Award / grant | 5,765 | 396,774 | Form 4 |
| 2025-12-22 | CYTK | Option exercise | 54,727 | 0 | Form 4 |
| 2025-12-22 | CYTK | Option exercise | 16,506 | 0 | Form 4 |
| 2025-12-22 | CYTK | Award / grant | 5,765 | 402,539 | Form 4 |
| 2025-12-03 | CYTK | Withheld for tax | 5,930 | 350,202 | Form 4 |
| 2025-11-05 | CYTK | Gift | 2,000 | 356,108 | Form 4 |
| 2025-03-14 | CYTK | Award / grant | 116,096 | 480,277 | Form 4 |
| 2025-03-14 | CYTK | Award / grant | 176,547 | 176,547 | Form 4 |
| 2025-03-14 | CYTK | Award / grant | 2,254 | 2,254 | Form 4 |
| 2024-12-03 | CYTK | Withheld for tax | 5,843 | 403,364 | Form 4 |
| 2024-12-03 | CYTK | Award / grant | 11,530 | 414,894 | Form 4 |
| 2024-12-03 | CYTK | Award / grant | 11,529 | 409,207 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.