Director Harrington Robert Arthur sold Cytokinetics Inc. ($CYTK) shares on the open market three times in the last year, totaling $266,000. His most recent sale occurred on December 1, 2025. These sales rank 7,827th among 11,678 insiders in our database, where the average is $8.6 million across about 6.4 transactions per insider. He made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 15, 2026 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 197 | $63.44 | 18,739.0000 | 122,264,929 | 1.06% | 0.00% |
| Dec. 1, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | S | Common Stock | 2150 | $66.80 | 18,542.0000 | 122,264,929 | 10.39% | 0.00% |
| Oct. 15, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 199 | $62.80 | 20,692.0000 | 118,410,689 | 0.97% | 0.00% |
| Sept. 2, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | S | Common Stock | 2150 | $48.67 | 20,493.0000 | 118,410,689 | 9.50% | 0.00% |
| July 15, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 328 | $38.01 | 22,643.0000 | 118,410,689 | 1.47% | 0.00% |
| May 14, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 7333 | $0.00 | 22,315.0000 | 118,410,689 | 48.95% | 0.01% |
| May 14, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Non-Qualified Stock Option (Right to Buy) | 10880 | $0.00 | 10,880.0000 | 118,410,689 | 9999.99% | 0.01% |
| April 15, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 324 | $38.56 | 14,982.0000 | 118,410,689 | 2.21% | 0.00% |
| April 3, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | S | Common Stock | 450 | $39.43 | 14,658.0000 | 118,410,689 | 2.98% | 0.00% |
| March 4, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | S | Common Stock | 900 | $42.50 | 15,108.0000 | 118,410,689 | 5.62% | 0.00% |
| Jan. 2, 2025 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 255 | $48.93 | 16,008.0000 | 0 | 1.62% | 0.00% |
| Oct. 1, 2024 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 237 | $52.60 | 15,753.0000 | 0 | 1.53% | 0.00% |
| July 5, 2024 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | S | Common Stock | 253 | $54.61 | 15,516.0000 | 0 | 1.60% | 0.00% |
| July 1, 2024 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 228 | $0.00 | 15,769.0000 | 0 | 1.47% | 0.00% |
| June 3, 2024 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | S | Common Stock | 1580 | $48.64 | 15,541.0000 | 0 | 9.23% | 0.00% |
| May 15, 2024 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 5600 | $0.00 | 17,121.0000 | 0 | 48.61% | 0.00% |
| May 15, 2024 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Non-Qualified Stock Option (Right to Buy) | 3636 | $0.00 | 3,636.0000 | 0 | 9999.99% | 0.00% |
| Jan. 2, 2024 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 148 | $84.12 | 11,521.0000 | 0 | 1.30% | 0.00% |
| Oct. 2, 2023 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 448 | $27.88 | 11,373.0000 | 0 | 4.10% | 0.00% |
| July 3, 2023 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 374 | $33.36 | 10,925.0000 | 0 | 3.54% | 0.00% |
| May 10, 2023 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 5000 | $0.00 | 10,551.0000 | 0 | 90.07% | 0.00% |
| May 10, 2023 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Non-Qualified Stock Option (Right to Buy) | 10000 | $0.00 | 10,000.0000 | 0 | 9999.99% | 0.00% |
| April 3, 2023 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 298 | $37.71 | 5,551.0000 | 0 | 5.67% | 0.00% |
| Jan. 3, 2023 | CYTOKINETICS INC | $CYTK | Harrington Robert Arthur | Director | A | Common Stock | 253 | $44.35 | 5,253.0000 | 0 | 5.06% | 0.00% |