RA Capital Nexus Fund, L.P. insider trades: Sionna Therapeutics (SION) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where RA Capital Nexus Fund, L.P. reports to the SEC
and 8 more companies
Open-market buys and sales
39 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | SION | ↓ Sell | 3,448,811 | $6.33 | $21.8M | Indirect | Sep 21, 2026 (4d) |
| Jul 31, 2026 | ARTV | ↑ Buy | 45,768 | $9.96 | $456K | Indirect | Jul 31, 2026 (0d) |
| Jul 24, 2026 | ARTV | ↑ Buy | 41,319 | $9.99 | $413K | Indirect | Jul 28, 2026 (4d) |
| Jul 23, 2026 | ARTV | ↑ Buy | 264,586 | $9.76 | $2.6M | Indirect | Jul 23, 2026 (0d) |
| Jul 17, 2026 | ARTV | ↑ Buy | 160,354 | $8.93 | $1.4M | Indirect | Jul 20, 2026 (3d) |
| Jul 13, 2026 | ARTV | ↑ Buy | 6,522 | $8.94 | $58K | Indirect | Jul 23, 2026 (10d) |
| Jul 13, 2026 | ARTV | ↑ Buy | 21,654 | $8.96 | $194K | Indirect | Jul 14, 2026 (1d) |
| Jun 26, 2026 | ARTV | ↑ Buy | 32,876 | $8.89 | $292K | Indirect | Jun 29, 2026 (3d) |
| Jun 16, 2026 | ARTV | ↑ Buy | 531,326 | $8.66 | $4.6M | Indirect | Jun 16, 2026 (0d) |
| Jun 11, 2026 | ARTV | ↑ Buy | 1,027,722 | $7.44 | $7.7M | Indirect | Jun 11, 2026 (0d) |
| May 11, 2026 | ARTV | ↑ Buy | 6,510,416 | $11.52 | $75.0M | Indirect | May 13, 2026 (2d) |
| Jan 5, 2026 | CLYM | ↑ Buy | 7,111 | $3.50 | $25K | Indirect | Jan 7, 2026 (2d) |
| Dec 12, 2025 | CLYM | ↑ Buy | 314,561 | $2.40 | $755K | Indirect | Dec 15, 2025 (3d) |
| Nov 21, 2025 | SION | ↓ Sell | 30,316 | $39.61 | $1.2M | Indirect | Nov 24, 2025 (3d) |
| Nov 19, 2025 | SION | ↓ Sell | 136,351 | $40.34 | $5.5M | Indirect | Nov 19, 2025 (0d) |
| Oct 28, 2025 | SION | ↓ Sell | 373,610 | $39.51 | $14.8M | Indirect | Oct 28, 2025 (0d) |
| Oct 21, 2025 | VOR | ↓ Sell | 117,050 | $29.34 | $3.4M | Indirect | Oct 22, 2025 (1d) |
| Oct 17, 2025 | VOR | ↓ Sell | 464,025 | $29.54 | $13.7M | Indirect | Oct 17, 2025 (0d) |
| Jun 16, 2025 | TYRA | ↑ Buy | 163,287 | $10.19 | $1.7M | Indirect | Jun 16, 2025 (0d) |
| Jun 9, 2025 | TYRA | ↑ Buy | 186,850 | $10.19 | $1.9M | Indirect | Jun 11, 2025 (2d) |
| Jun 5, 2025 | TYRA | ↑ Buy | 1,211,198 | $9.70 | $11.8M | Indirect | Jun 6, 2025 (1d) |
| Feb 10, 2025 | SION | ↑ Buy | 1,125,000 | $18.00 | $20.3M | Indirect | Feb 10, 2025 (0d) |
| Jan 30, 2025 | ETNB | ↑ Buy | 5,714,285 | $8.75 | $50.0M | Indirect | Feb 3, 2025 (4d) |
| Nov 8, 2024 | TYRA | ↑ Buy | 1,220,681 | $16.25 | $19.8M | Indirect | Nov 13, 2024 (5d) |
| Jul 22, 2024 | ARTV | ↑ Buy | 8,333,333 | $12.00 | $100.0M | Indirect | Jul 24, 2024 (2d) |
| Jun 27, 2024 | ELYM | ↑ Buy | 13,008,546 | $3.84 | $50.0M | Indirect | Jul 1, 2024 (4d) |
| Jun 17, 2024 | AVTE | ↑ Buy | 928,110 | $1.67 | $1.5M | Indirect | Jun 20, 2024 (3d) |
| Mar 27, 2024 | NKTX | ↑ Buy | 3,000,000 | $10.00 | $30.0M | Indirect | Mar 29, 2024 (2d) |
| Mar 4, 2024 | ETNB | ↑ Buy | 1,350,000 | $15.35 | $20.7M | Indirect | Mar 6, 2024 (2d) |
| Jan 11, 2024 | SLDB | ↑ Buy | 904,160 | $5.53 | $5.0M | Indirect | Jan 12, 2024 (1d) |
| Jul 5, 2023 | BDTX | ↑ Buy | 935,850 | $5.00 | $4.7M | Indirect | Jul 7, 2023 (2d) |
| Mar 24, 2023 | ETNB | ↑ Buy | 2,461,538 | $16.25 | $40.0M | Indirect | Mar 30, 2023 (6d) |
| Oct 18, 2022 | ETNB | ↑ Buy | 1,172,741 | $7.65 | $9.0M | Indirect | Oct 20, 2022 (2d) |
| Jul 1, 2022 | ETNB | ↑ Buy | 2,816,900 | $3.55 | $10.0M | Indirect | Jul 6, 2022 (5d) |
| Apr 26, 2022 | NKTX | ↑ Buy | 2,200,000 | $15.00 | $33.0M | Indirect | Apr 28, 2022 (2d) |
| Sep 17, 2021 | TYRA | ↑ Buy | 1,250,000 | $16.00 | $20.0M | Indirect | Sep 17, 2021 (0d) |
| Aug 12, 2021 | ELYM | ↑ Buy | 3,200,000 | $12.50 | $40.0M | Indirect | Aug 16, 2021 (4d) |
| Jul 2, 2021 | AVTE | ↑ Buy | 2,785,714 | $14.00 | $39.0M | Indirect | Jul 6, 2021 (4d) |
| Jun 30, 2020 | AKUS | ↑ Buy | 825,000 | $17.00 | $14.0M | Indirect | Jul 2, 2020 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other SION insiders
Open-market trades in the last 12 months
About RA Capital Nexus Fund, L.P.'s insider trades
RA Capital Nexus Fund, L.P. is a director at Sionna Therapeutics (SION). Since Jun 30, 2020, it has reported 33 open-market purchases worth $615.8M and 6 sales worth $60.4M on SEC Form 4. In the last 12 months: 12 buys ($93.5M) and 3 sales ($28.5M).
Its filings also include grants and awards (41 filings), other transactions (8 filings), conversions (6 filings), option exercises (2 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every SION insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.