Eric Mosbrooker, Chief Commercial Officer of Avidity Biosciences ($RNA), sold about $6.4 million worth of company shares in four open market transactions over the past year. His most recent sale occurred on October 3, 2025. These sales rank him 1,618th among nearly 12,000 insiders by total value sold, below the average of $8.6 million across about 6.4 transactions per insider. Mosbrooker made no open market purchases in this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb. 27, 2026 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | D | Stock Option (Right to Buy) | 50000 | $0.00 | 0.0000 | 150,675,742 | 100.00% | 0.03% |
| Feb. 27, 2026 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | D | Stock Option (Right to Buy) | 177188 | $0.00 | 0.0000 | 150,675,742 | 100.00% | 0.12% |
| Feb. 27, 2026 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | D | Common Stock | 79413 | $0.00 | 0.0000 | 150,675,742 | 100.00% | 0.05% |
| Dec. 17, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | A | Common Stock | 72000 | $0.00 | 127,000.0000 | 150,675,742 | 130.91% | 0.05% |
| Dec. 17, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | F | Common Stock | 11426 | $71.87 | 79,010.0000 | 150,675,742 | 12.63% | 0.01% |
| Dec. 17, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | F | Common Stock | 36564 | $71.87 | 90,436.0000 | 150,675,742 | 28.79% | 0.02% |
| Oct. 3, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | M | Common Stock | 6562 | $9.05 | 61,562.0000 | 120,212,301 | 11.93% | 0.01% |
| Oct. 3, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | S | Common Stock | 6562 | $45.38 | 55,000.0000 | 120,212,301 | 10.66% | 0.01% |
| Oct. 3, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | M | Stock Option (Right to Buy) | 6562 | $0.00 | 177,188.0000 | 120,212,301 | 3.57% | 0.01% |
| Sept. 3, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | M | Stock Option (Right to Buy) | 6563 | $0.00 | 183,750.0000 | 120,212,301 | 3.45% | 0.01% |
| Sept. 3, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | M | Common Stock | 6563 | $9.05 | 61,563.0000 | 120,212,301 | 11.93% | 0.01% |
| Sept. 3, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | S | Common Stock | 6563 | $47.07 | 55,000.0000 | 120,212,301 | 10.66% | 0.01% |
| Aug. 6, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | M | Common Stock | 124687 | $9.05 | 185,807.0000 | 120,212,301 | 204.00% | 0.10% |
| Aug. 6, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | S | Common Stock | 6120 | $44.06 | 55,000.0000 | 120,212,301 | 10.01% | 0.01% |
| Aug. 6, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | S | Common Stock | 124687 | $44.06 | 61,120.0000 | 120,212,301 | 67.11% | 0.10% |
| Aug. 6, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | M | Stock Option (Right to Buy) | 124687 | $0.00 | 190,313.0000 | 120,212,301 | 39.58% | 0.10% |
| Jan. 6, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | A | Stock Option (Right to Buy) | 50000 | $0.00 | 50,000.0000 | 0 | 9999.99% | 0.00% |
| Jan. 6, 2025 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Chief Commercial Officer | A | Common Stock | 25000 | $0.00 | 61,120.0000 | 0 | 69.21% | 0.00% |
| June 15, 2023 | Avidity Biosciences, Inc. | $RNAM | Mosbrooker Eric | Director | A | Stock Option (Right to Buy) | 22000 | $0.00 | 22,000.0000 | 0 | 9999.99% | 0.00% |