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: $10.9MIndirect: $0$10.9Mas of 2026-09-16
  • Direct $10.9M
  • Indirect $0
CYTKdirect156,745 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

CYTK · 69 trades
2026-09-15: Sale, 97,926 sh ($6.8M)2026-09-14: Sale, 7,500 sh ($551K)2026-09-14: Option exercise, 7,500 sh ($80K)2026-09-14: Gift, 97,926 sh ($0)2026-09-14: Option exercise, 7,500 sh ($0)2026-09-14: Gift, 1,350 sh ($0)2026-09-14: Gift, 97,926 sh ($0)2026-08-31: Sale, 7,500 sh ($527K)2026-08-31: Option exercise, 7,500 sh ($80K)2026-08-31: Option exercise, 7,500 sh ($0)2026-08-10: Sale, 7,500 sh ($576K)2026-08-10: Option exercise, 7,500 sh ($80K)2026-08-10: Option exercise, 7,500 sh ($0)2026-07-27: Sale, 7,500 sh ($607K)2026-07-27: Option exercise, 7,500 sh ($80K)2026-07-27: Option exercise, 7,500 sh ($0)2026-07-13: Sale, 7,490 sh ($614K)2026-07-13: Option exercise, 7,490 sh ($79K)2026-07-13: Sale, 10 sh ($820)2026-07-13: Option exercise, 7,490 sh ($0)2026-07-01: Sale, 7,500 sh ($637K)2026-06-15: Sale, 7,500 sh ($528K)2026-05-27: Sale, 7,500 sh ($579K)2026-05-14: Sale, 7,500 sh ($584K)2026-04-29: Sale, 7,500 sh ($447K)2026-04-15: Sale, 7,500 sh ($490K)2026-04-01: Sale, 7,500 sh ($500K)2026-03-17: Sale, 23,928 sh ($1.5M)2026-03-17: Sale, 12,673 sh ($788K)2026-03-15: Award / grant, 75,258 sh ($0)2026-03-15: Award / grant, 1,665 sh ($0)2026-03-15: Award / grant, 111,864 sh ($0)2026-03-09: Sale, 7,931 sh ($482K)2025-12-22: Withheld for tax, 30,426 sh ($2.1M)2025-12-22: Option exercise, 54,727 sh ($365K)2025-12-22: Withheld for tax, 2,935 sh ($184K)2025-12-22: Option exercise, 16,506 sh ($110K)2025-12-22: Award / grant, 5,765 sh ($0)2025-12-22: Option exercise, 54,727 sh ($0)2025-12-22: Option exercise, 16,506 sh ($0)2025-12-22: Award / grant, 5,765 sh ($0)2025-12-03: Withheld for tax, 5,930 sh ($386K)2025-11-05: Gift, 2,000 sh ($0)2025-10-30: Sale, 5,000 sh ($314K)2025-10-16: Sale, 5,000 sh ($300K)2025-10-01: Sale, 5,000 sh ($275K)2025-09-15: Sale, 5,000 sh ($249K)2025-09-02: Sale, 5,000 sh ($244K)2025-08-15: Sale, 5,000 sh ($192K)2025-07-29: Sale, 5,000 sh ($182K)2025-07-14: Sale, 5,000 sh ($191K)2025-07-01: Sale, 5,000 sh ($168K)2025-06-16: Sale, 5,000 sh ($169K)2025-06-02: Sale, 5,000 sh ($156K)2025-05-16: Sale, 5,000 sh ($155K)2025-04-29: Sale, 5,000 sh ($205K)2025-04-10: Sale, 5,000 sh ($184K)2025-03-31: Sale, 15,000 sh ($611K)2025-03-17: Sale, 25,000 sh ($1.1M)2025-03-17: Sale, 12,648 sh ($561K)2025-03-14: Award / grant, 116,096 sh ($0)2025-03-14: Award / grant, 176,547 sh ($0)2025-03-14: Award / grant, 2,254 sh ($0)2025-03-06: Sale, 16,970 sh ($737K)2025-03-05: Sale, 25,000 sh ($1.1M)2025-03-03: Sale, 8,743 sh ($375K)2024-12-03: Withheld for tax, 5,843 sh ($301K)2024-12-03: Award / grant, 11,530 sh ($0)2024-12-03: Award / grant, 11,529 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-09-15CYTKSale97,926 @ $69.33$6.8M−100.0% of holding0Form 4
2026-09-14CYTKSale7,500 @ $73.44$551K−1.9% of holding377,820Form 4
2026-08-31CYTKSale7,500 @ $70.24$527K−1.9% of holding377,820Form 4
2026-08-10CYTKSale7,500 @ $76.76$576K−1.9% of holding377,820Form 4
2026-07-27CYTKSale7,500 @ $80.87$607K−1.9% of holding377,820Form 4
2026-07-13CYTKSale7,490 @ $82.02$614K−1.9% of holding377,820Form 4
2026-07-13CYTKSale10 @ $82.02$820−0.0% of holding377,820Form 4
2026-07-01CYTKSale7,500 @ $84.92$637K−1.9% of holding377,830Form 4
2026-06-15CYTKSale7,500 @ $70.46$528K−1.9% of holding385,330Form 4
2026-05-27CYTKSale7,500 @ $77.21$579K−1.9% of holding392,830Form 4
2026-05-14CYTKSale7,500 @ $77.92$584K−1.8% of holding400,330Form 4
2026-04-29CYTKSale7,500 @ $59.62$447K−1.8% of holding407,830Form 4
2026-04-15CYTKSale7,500 @ $65.38$490K−1.8% of holding415,330Form 4
2026-04-01CYTKSale7,500 @ $66.63$500K−1.7% of holding422,830Form 4
2026-03-17CYTKSale23,928 @ $62.15$1.5M−5.3% of holding430,330Form 4
2026-03-17CYTKSale12,673 @ $62.15$788K−2.7% of holding454,258Form 4
2026-03-09CYTKSale7,931 @ $60.72$482K−2.0% of holding391,673Form 4
2025-10-30CYTKSale5,000 @ $62.86$314K−1.4% of holding358,108Form 4
2025-10-16CYTKSale5,000 @ $60.03$300K−1.4% of holding363,108Form 4
2025-10-01CYTKSale5,000 @ $55.05$275K−1.3% of holding368,108Form 4
2025-09-15CYTKSale5,000 @ $49.77$249K−1.3% of holding373,108Form 4
2025-09-02CYTKSale5,000 @ $48.76$244K−1.3% of holding378,108Form 4
2025-08-15CYTKSale5,000 @ $38.42$192K−1.3% of holding383,108Form 4
2025-07-29CYTKSale5,000 @ $36.45$182K−1.3% of holding388,108Form 4
2025-07-14CYTKSale5,000 @ $38.15$191K−1.3% of holding393,108Form 4
2025-07-01CYTKSale5,000 @ $33.55$168K−1.2% of holding398,108Form 4
2025-06-16CYTKSale5,000 @ $33.80$169K−1.2% of holding403,108Form 4
2025-06-02CYTKSale5,000 @ $31.22$156K−1.2% of holding408,108Form 4
2025-05-16CYTKSale5,000 @ $30.93$155K−1.2% of holding412,629Form 4
2025-04-29CYTKSale5,000 @ $40.96$205K−1.2% of holding417,629Form 4
2025-04-10CYTKSale5,000 @ $36.77$184K−1.2% of holding422,629Form 4
2025-03-31CYTKSale15,000 @ $40.75$611K−3.4% of holding427,629Form 4
2025-03-17CYTKSale25,000 @ $44.65$1.1M−6.9% of holding339,181Form 4
2025-03-17CYTKSale12,648 @ $44.38$561K−3.7% of holding326,533Form 4
2025-03-06CYTKSale16,970 @ $43.44$737K−4.5% of holding364,181Form 4
2025-03-05CYTKSale25,000 @ $43.23$1.1M−6.2% of holding381,151Form 4
2025-03-03CYTKSale8,743 @ $42.88$375K−2.1% of holding406,151Form 4
32 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-09-14CYTKOption exercise7,500385,320Form 4
2026-09-14CYTKGift97,926278,544Form 4
2026-09-14CYTKOption exercise7,500156,745Form 4
2026-09-14CYTKGift1,350376,470Form 4
2026-09-14CYTKGift97,92697,926Form 4
2026-08-31CYTKOption exercise7,500385,320Form 4
2026-08-31CYTKOption exercise7,500164,245Form 4
2026-08-10CYTKOption exercise7,500385,320Form 4
2026-08-10CYTKOption exercise7,500171,745Form 4
2026-07-27CYTKOption exercise7,500385,320Form 4
2026-07-27CYTKOption exercise7,500179,245Form 4
2026-07-13CYTKOption exercise7,490385,310Form 4
2026-07-13CYTKOption exercise7,490186,745Form 4
2026-03-15CYTKAward / grant75,258466,931Form 4
2026-03-15CYTKAward / grant1,6651,665Form 4
2026-03-15CYTKAward / grant111,864111,864Form 4
2025-12-22CYTKWithheld for tax30,426374,503Form 4
2025-12-22CYTKOption exercise54,727404,929Form 4
2025-12-22CYTKWithheld for tax2,935399,604Form 4
2025-12-22CYTKOption exercise16,506391,009Form 4
2025-12-22CYTKAward / grant5,765396,774Form 4
2025-12-22CYTKOption exercise54,7270Form 4
2025-12-22CYTKOption exercise16,5060Form 4
2025-12-22CYTKAward / grant5,765402,539Form 4
2025-12-03CYTKWithheld for tax5,930350,202Form 4
2025-11-05CYTKGift2,000356,108Form 4
2025-03-14CYTKAward / grant116,096480,277Form 4
2025-03-14CYTKAward / grant176,547176,547Form 4
2025-03-14CYTKAward / grant2,2542,254Form 4
2024-12-03CYTKWithheld for tax5,843403,364Form 4
2024-12-03CYTKAward / grant11,530414,894Form 4
2024-12-03CYTKAward / grant11,529409,207Form 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.