Insider · CIK 0001715283
Eric Mosbrooker
officer
Files at RNA (Avidity Biosciences, Inc.). First filing Aug 8, 2025, latest Oct 7, 2025.
Track record
Not enough history
Fewer than three past buys with six months of prices.
Median 6-month excess
-
after past buys, n = 0
Hit rate
-
past buys that beat the index over 6 months
Open-market trades
0 / 3
$0 bought, $6.4M sold
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
RNA: Avidity Biosciences, Inc.
RNAOct 9, 2026 · close 8.40
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 14Weak | Avidity Biosciences, Inc. | $298k 6,562 shares | -11% | - | |
| 14Weak | Avidity Biosciences, Inc. | $309k 6,563 shares | -11% | - | |
| 40Moderate | Avidity Biosciences, Inc. | $5.8M 130,807 shares | -70% | - |
Transactions
Every row this insider has filed, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Feb 27, 2026 | RNA Avidity Biosciences, Inc. | DDisposition to issuer Common Stock | -79,413 | - | - | 0 | Feb 27, 2026 |
| Feb 27, 2026 | RNA Avidity Biosciences, Inc. | DDisposition to issuer Stock Option (Right to Buy)derivative | -177,188 | - | - | 0 | Feb 27, 2026 |
| Feb 27, 2026 | RNA Avidity Biosciences, Inc. | DDisposition to issuer Stock Option (Right to Buy)derivative | -50,000 | - | - | 0 | Feb 27, 2026 |
| Dec 17, 2025 | RNA Avidity Biosciences, Inc. | AGrant or award Common Stock | +72,000 | $0.00 | $0 | 127,000 | Dec 19, 2025 |
| Dec 17, 2025 | RNA Avidity Biosciences, Inc. | FTax withholding Common Stock | -36,564 | $71.87 | $2.6M | 90,436 | Dec 19, 2025 |
| Dec 17, 2025 | RNA Avidity Biosciences, Inc. | FTax withholding Common Stock | -11,426 | $71.87 | $821k | 79,010 | Dec 19, 2025 |
| Oct 3, 2025 | RNA Avidity Biosciences, Inc. | MOption exercise Common Stock10b5-1 | +6,562 | $9.05 | $59k | 61,562 | Oct 7, 2025 |
| Oct 3, 2025 | RNA Avidity Biosciences, Inc. | SOpen-market sale Common Stock10b5-1 | -6,562 | $45.38 | $298k | 55,000 | Oct 7, 2025 |
| Oct 3, 2025 | RNA Avidity Biosciences, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -6,562 | $0.00 | $0 | 177,188 | Oct 7, 2025 |
| Sep 3, 2025 | RNA Avidity Biosciences, Inc. | MOption exercise Common Stock10b5-1 | +6,563 | $9.05 | $59k | 61,563 | Sep 5, 2025 |
| Sep 3, 2025 | RNA Avidity Biosciences, Inc. | SOpen-market sale Common Stock10b5-1 | -6,563 | $47.07 | $309k | 55,000 | Sep 5, 2025 |
| Sep 3, 2025 | RNA Avidity Biosciences, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -6,563 | $0.00 | $0 | 183,750 | Sep 5, 2025 |
| Aug 6, 2025 | RNA Avidity Biosciences, Inc. | MOption exercise Common Stock10b5-1 | +124,687 | $9.05 | $1.1M | 185,807 | Aug 8, 2025 |
| Aug 6, 2025 | RNA Avidity Biosciences, Inc. | SOpen-market sale Common Stock10b5-1 | -124,687 | $44.06 | $5.5M | 61,120 | Aug 8, 2025 |
| Aug 6, 2025 | RNA Avidity Biosciences, Inc. | SOpen-market sale Common Stock10b5-1 | -6,120 | $44.06 | $270k | 55,000 | Aug 8, 2025 |
| Aug 6, 2025 | RNA Avidity Biosciences, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -124,687 | $0.00 | $0 | 190,313 | Aug 8, 2025 |
| Jan 6, 2025 | RNA Avidity Biosciences, Inc. | AGrant or award Common Stock | +25,000 | $0.00 | $0 | 61,120 | Jan 8, 2025 |
| Jan 6, 2025 | RNA Avidity Biosciences, Inc. | AGrant or award Stock Option (Right to Buy)derivative | +50,000 | $0.00 | $0 | 50,000 | Jan 8, 2025 |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.