Harrington Robert Arthur
SEC insider (Form 3/4/5 filer). CIK 0001923988. Director at CYTOKINETICS INC (CYTK). 15 reported Form 4/5 transactions since Sep 2024; latest on Oct 16, 2026. Located in SOUTH SAN FRANCISCO, CA.
Companies Harrington Robert Arthur has filed insider reports for
- CYTOKINETICS INC (CYTK): Director
Harrington Robert Arthur
CIK: 0001923988
Transaction Breakdown
Open Market Buys (P)0 (0.0%)
High conviction signal
Open Market Sales (S)4 (26.7%)
Position reduction
Option Exercises (M)0 (0.0%)
Derivative conversions
Awards (A)11 (73.3%)
Compensation grants
Other (G, F, J, C, D, …)0 (0.0%)
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
CYTK
CYTOKINETICS INC
Director
Discretionary Trading P&L
Holdings
Transaction History (15 total)
- Oct 16, 2026CYTK
CYTOKINETICS INC
AwardDirect195 shares at avg. $63.92$12K - Jul 15, 2026CYTK
CYTOKINETICS INC
AwardDirect151 shares at avg. $82.62$12K - May 27, 2026CYTK
CYTOKINETICS INC
AwardDirect2.9K shares- - Apr 15, 2026CYTK
CYTOKINETICS INC
AwardDirect191 shares at avg. $65.37$12K - Jan 15, 2026CYTK
CYTOKINETICS INC
AwardDirect197 shares at avg. $63.44$12K - Dec 1, 2025CYTK
CYTOKINETICS INC
SaleDirect2.2K shares at avg. $66.80$144K - Oct 15, 2025CYTK
CYTOKINETICS INC
AwardDirect199 shares at avg. $62.80$12K - Sep 2, 2025CYTK
CYTOKINETICS INC
SaleDirect2.2K shares at avg. $48.67$105K - Jul 15, 2025CYTK
CYTOKINETICS INC
AwardDirect328 shares at avg. $38.01$12K - May 14, 2025CYTK
CYTOKINETICS INC
AwardDirect7.3K shares-
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Oct 16, 2026 | CYTK CYTOKINETICS INC | Award | 195 | $63.92 | $12,464 | Direct |
| Jul 15, 2026 | CYTK CYTOKINETICS INC | Award | 151 | $82.62 | $12,476 | Direct |
| May 27, 2026 | CYTK CYTOKINETICS INC | Award | 2,851 | - | $0 | Direct |
| Apr 15, 2026 | CYTK CYTOKINETICS INC | Award | 191 | $65.37 | $12,486 | Direct |
| Jan 15, 2026 | CYTK CYTOKINETICS INC | Award | 197 | $63.44 | $12,498 | Direct |
| Dec 1, 2025 | CYTK CYTOKINETICS INC | Sale | 2,150 | $66.80 | $143,620 | Direct |
| Oct 15, 2025 | CYTK CYTOKINETICS INC | Award | 199 | $62.80 | $12,497 | Direct |
| Sep 2, 2025 | CYTK CYTOKINETICS INC | Sale | 2,150 | $48.67 | $104,641 | Direct |
| Jul 15, 2025 | CYTK CYTOKINETICS INC | Award | 328 | $38.01 | $12,467 | Direct |
| May 14, 2025 | CYTK CYTOKINETICS INC | Award | 7,333 | - | - | Direct |
1-10 of 15 transactions