Rosenthal Arnon, CEO of Alector Inc ($ALEC), made four open market sales of company shares over the past year, totaling about $489,000. His most recent sale occurred on March 2, 2026. These transactions rank 6,508th out of 11,678 insiders by sale value, well below the average of $8.6 million across 6 sales per insider. Arnon reported no open market purchases in the period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 13, 2026 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Common Stock | 116246 | $0.00 | 6,384,797.0000 | 109,151,472 | 1.85% | 0.11% |
| March 2, 2026 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 81864 | $2.12 | 6,268,551.0000 | 109,151,472 | 1.29% | 0.08% |
| Dec. 3, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 104347 | $1.12 | 6,350,415.0000 | 109,151,472 | 1.62% | 0.10% |
| Nov. 10, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Employee Stock Option (right to buy) | 522500 | $0.00 | 522,500.0000 | 109,151,472 | 9999.99% | 0.48% |
| Nov. 10, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Common Stock | 174167 | $0.00 | 6,454,762.0000 | 109,151,472 | 2.77% | 0.16% |
| Sept. 2, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 51562 | $2.50 | 6,280,595.0000 | 99,085,888 | 0.81% | 0.05% |
| July 1, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Common Stock | 137125 | $0.00 | 6,482,157.0000 | 99,085,888 | 2.16% | 0.14% |
| July 1, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Employee Stock Option (right to buy) | 45700 | $0.00 | 45,700.0000 | 99,085,888 | 9999.99% | 0.05% |
| June 2, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 52087 | $1.34 | 6,345,032.0000 | 99,085,888 | 0.81% | 0.05% |
| March 3, 2025 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 40330 | $1.47 | 6,397,119.0000 | 99,085,888 | 0.63% | 0.04% |
| Dec. 2, 2024 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 52172 | $2.52 | 6,437,449.0000 | 0 | 0.80% | 0.00% |
| Oct. 1, 2024 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Common Stock | 610500 | $0.00 | 6,489,621.0000 | 0 | 10.38% | 0.00% |
| Sept. 3, 2024 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 26499 | $4.88 | 5,879,121.0000 | 0 | 0.45% | 0.00% |
| June 3, 2024 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 25135 | $4.80 | 5,905,620.0000 | 0 | 0.42% | 0.00% |
| March 4, 2024 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 18837 | $6.92 | 5,930,755.0000 | 0 | 0.32% | 0.00% |
| Dec. 4, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 23831 | $5.56 | 5,949,592.0000 | 0 | 0.40% | 0.00% |
| Oct. 1, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Common Stock | 397600 | $0.00 | 5,973,423.0000 | 0 | 7.13% | 0.00% |
| Oct. 1, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Employee Stock Option (right to buy) | 132500 | $0.00 | 132,500.0000 | 0 | 9999.99% | 0.00% |
| Sept. 5, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 5647 | $5.19 | 5,575,823.0000 | 0 | 0.10% | 0.00% |
| June 2, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 5255 | $6.90 | 5,581,470.0000 | 0 | 0.09% | 0.00% |
| March 3, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | A | Common Stock | 42990 | $0.00 | 5,601,911.0000 | 0 | 0.77% | 0.00% |
| March 17, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 15186 | $6.22 | 5,586,725.0000 | 0 | 0.27% | 0.00% |
| March 2, 2023 | Alector, Inc. | $ALEC | Rosenthal Arnon | Chief Executive Officer | S | Common Stock | 5849 | $8.32 | 5,558,921.0000 | 0 | 0.11% | 0.00% |