RA Capital Management, L.P. is Director & 10% Owner at Sionna Therapeutics, Inc. (SION). They have made 60 open-market trades across 28 companies since 2020, most recently 2026-09-17.
CIK 0001346824
44 open-market purchases totalling $1.3B since 2020, against 16 sales. Across 37 scored buys the stock is up 12.5% at ninety days, and 7.6 points ahead of the S&P over the same stretch.
43 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 63% | 58% | 57% |
| Avg Move | +2.4% | +8.7% | +12.5% |
| Alpha | +1.3% | +6.9% | +7.6% |
| Scored | 43 | 43 | 37 |
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 75% | 53% | 38% |
| Avg Move | -7.4% | -7.1% | +37.1% |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| SION | SELL | 2026-09-17 | 2026-09-21 | $6.33 | $21.8M | -14.1% | — | — |
| SEPN | SELL | 2026-08-12 | 2026-08-14 | $42.50 | $31.7M | -8.7% | -10.1% | — |
| ARTV | BUY | 2026-07-29 | 2026-07-31 | $9.96 | $456K | +14.6% | +12.5% | — |
| ARTV | BUY | 2026-07-24 | 2026-07-28 | $9.99 | $413K | +5.6% | +12.8% | — |
| ARTV | BUY | 2026-07-21 | 2026-07-23 | $9.76 | $2.6M | +4.1% | +8.8% | — |
| PBLS | BUY | 2026-07-20 | 2026-07-22 | $28.29 | $6.9M | +9.6% | +26.8% | — |
| ARTV | BUY | 2026-07-16 | 2026-07-20 | $8.93 | $1.4M | +7.1% | +20.2% | — |
| VOR | SELL | 2026-07-16 | 2026-07-21 | $19.75 | $4K | +5.4% | +14.9% | — |
| ARTV | BUY | 2026-07-13 | 2026-07-23 | $8.94 | $58K | +4.1% | +8.8% | — |
| ARTV | BUY | 2026-07-10 | 2026-07-14 | $8.96 | $194K | +3.8% | +17.1% | -29.9% |
| ARTV | BUY | 2026-06-25 | 2026-06-29 | $8.89 | $292K | -1.4% | +2.2% | -27.8% |
| HOWL | SELL | 2026-06-17 | 2026-06-22 | $0.35 | $146K | -7.5% | +2.6% | +169.1% |
| COAG | BUY | 2026-06-15 | 2026-06-17 | $24.97 | $1.7M | +30.0% | +74.6% | +42.6% |
| ARTV | BUY | 2026-06-12 | 2026-06-16 | $8.66 | $4.6M | +2.3% | -3.8% | +8.2% |
| HOWL | SELL | 2026-06-12 | 2026-06-16 | $0.39 | $174K | -24.2% | -7.4% | +143.9% |
| PBLS | BUY | 2026-06-11 | 2026-06-15 | $20.00 | $423.8M | +11.1% | +15.1% | +38.9% |
| HOWL | SELL | 2026-06-09 | 2026-06-11 | $0.37 | $254K | -7.2% | -14.7% | +138.1% |
| ARTV | BUY | 2026-06-09 | 2026-06-11 | $7.44 | $7.7M | +8.8% | +4.4% | +25.6% |
| COAG | BUY | 2026-05-19 | 2026-05-21 | $24.96 | $120K | +0.1% | +19.4% | +95.8% |
| COAG | BUY | 2026-05-12 | 2026-05-14 | $24.90 | $159K | +1.2% | -10.8% | +90.5% |
| ARTV | BUY | 2026-05-11 | 2026-05-13 | $11.52 | $75.0M | -29.7% | -21.3% | +8.4% |
| HOWL | SELL | 2026-05-08 | 2026-05-12 | $0.69 | $391K | -22.2% | -32.1% | -32.8% |
| COAG | BUY | 2026-05-07 | 2026-05-11 | $24.75 | $1.3M | +7.2% | +3.1% | +100.4% |
| COAG | BUY | 2026-05-04 | 2026-05-06 | $18.39 | $52.2M | +12.3% | +4.6% | +93.5% |
| VOR | SELL | 2026-04-22 | 2026-04-24 | $15.77 | $2.6M | +14.8% | +2.0% | +37.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| ETNB | 11,081,584 | $164.5M |
| MLYS | 5,825,521 | $118.2M |
| ARTV | 17,329,570 | $101.5M |
| PAND | 1,408,912 | $84.6M |
| WVE | 26,975,505 | $84.4M |
| BCAX | 4,603,418 | $77.2M |
| IMRA | 3,880,021 | $56.6M |
| FDMT | 4,563,211 | $55.4M |
| CTKB | 9,773,257 | $51.4M |
| SGP | 2,054,678 | $49.6M |
| FULC | 11,609,704 | $42.5M |
| SPRY | 9,958,073 | $39.9M |
| PHAT | 3,707,408 | $25.7M |
| AKUS | 1,456,249 | $19.4M |
| NKTX | 10,050,818 | $18.2M |
| SION | 3,448,812 | $13.5M |
| RACA | 1,098,318 | $11.3M |
| EVMN | 1,517,329 | $7.9M |
| BDTX | 3,213,828 | $5.5M |
| ACET | 1,182,624 | $5.4M |
| STSA | 566,011 | $623K |
| SLDB | 109,661 | $609K |
| HOWL | 303,719 | $298K |
| JANX | 11,750 | $194K |
| ABOS | 48,300 | $82K |
| VOR | 1,500 | $27K |
| ACRV | 9,366 | $15K |
| FRNM | 1,245,068 | — |
| FTMX | 7,250 | — |
| Total | $3.1B |
Shares reported on the most recent Form 4, priced at the 2026-09-21 close. 2 holdings could not be priced and are excluded from the total.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Scored | 16 | 15 | 13 |