🕵️ Avidity Biosciences, Inc. ($RNAM)
SEC insider & ownership activity, last 12 months · CIK 1599901 · every row links its SEC filing
Over the last 12 months insiders sold $33.4M with no open-market buying against it. Eric Mosbrooker sold $6.4M through a 10b5-1 trading plan in 4 lots (Aug–Oct). Blackrock, Inc. trimmed 7.5% → 6.4%. One red-flag 8-K in the window: Delisting notice (3.01), Feb 26, 2026.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 11 sellers, $33.4M (50 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Eric Mosbrooker | 0 | – | 4 | $6.4M | Oct 3, 2025 |
| Wilson Troy Edward | 0 | – | 8 | $5.8M | Sep 5, 2025 |
| Boyce Sarah | 0 | – | 5 | $5.4M | Jan 21, 2026 |
| Arthur A. Levin | 0 | – | 2 | $5.2M | Jan 21, 2026 |
| Hughes Steven George | 0 | – | 13 | $4.4M | Jan 21, 2026 |
| Teresa McCarthy | 0 | – | 6 | $2.4M | Jan 21, 2026 |
| Michael F. MacLean | 0 | – | 4 | $1.8M | Jan 21, 2026 |
| William Michael Flanagan | 0 | – | 4 | $1.4M | Jan 21, 2026 |
| Calderaro Charles III | 0 | – | 1 | $269K | Jan 7, 2026 |
| John B. Moriarty | 0 | – | 2 | $253K | Jan 7, 2026 |
| Kathleen P. Gallagher | 0 | – | 1 | $9K | Sep 2, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| The Vanguard Group | 9.6% | 13G | Oct 30, 2025 | filing ↗ | |
| Wellington Management Company LLP | 7.5% | 13G | May 12, 2025 | filing ↗ | |
| Blackrock, Inc. | 6.4% | 13G | Oct 17, 2025 | filing ↗ | |
| Avoro Capital Advisors LLC | 5.5% | 13G | Feb 17, 2026 | filing ↗ | |
| Behzad Aghazadeh | 5.5% | 13G | Feb 17, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| William Michael Flanagan | $928K | Sep 11, 2025 | filing ↗ |
| Wilson Troy Edward | $4.8M | Sep 5, 2025 | filing ↗ |
| Sarah Boyce | $2.4M | Sep 5, 2025 | filing ↗ |
| Eric Mosbrooker | $930K | Sep 3, 2025 | filing ↗ |
| Sarah Boyce | $1.2M | Aug 28, 2025 | filing ↗ |
| Teresa McCarthy | $2.1M | Aug 15, 2025 | filing ↗ |
| Steven George Hughes | $449K | Aug 13, 2025 | filing ↗ |
| Wilson Troy Edward | $4.3M | Aug 6, 2025 | filing ↗ |
| Eric Mosbrooker | $5.0M | Aug 6, 2025 | filing ↗ |
| Steven George Hughes | $3.1M | Aug 6, 2025 | filing ↗ |
| Arthur Levin | $4.1M | Aug 6, 2025 | filing ↗ |
| Michael MacLean | $1.2M | Aug 6, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Agreement terminated (1.02) | Feb 26, 2026 | filing ↗ |
| Acquisition or disposition (2.01) | Feb 26, 2026 | filing ↗ |
| Delisting notice (3.01) | Feb 26, 2026 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Feb 26, 2026 | filing ↗ |
| Change of control (5.01) | Feb 26, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 26, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Feb 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 26, 2026 | filing ↗ |
| Shareholder vote (5.07) | Feb 26, 2026 | filing ↗ |
| Other events (8.01) | Feb 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 2, 2026 | filing ↗ |
| Other events (8.01) | Feb 2, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 2, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 14, 2025 | filing ↗ |
| Other events (8.01) | Dec 14, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 14, 2025 | filing ↗ |
| Earnings (2.02) | Nov 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 10, 2025 | filing ↗ |
| Material agreement (1.01) | Oct 25, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 25, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 25, 2025 | filing ↗ |
| Other events (8.01) | Oct 13, 2025 | filing ↗ |
| Other events (8.01) | Sep 11, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 11, 2025 | filing ↗ |
| Officer/director changes (5.02) | Sep 9, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Sep 9, 2025 | filing ↗ |
| Other events (8.01) | Sep 9, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 9, 2025 | filing ↗ |
| Material agreement (1.01) | Aug 1, 2025 | filing ↗ |