All stock lists
Sionna Therapeutics, Inc. (SION)
NASDAQ: SION · Real-Time Price · USD
3.60-0.00 (-0.14%)
Market cap
$162M
Website
Insider Score
––Not scored
SION Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
SION Stock Insider Trading Activity
SION stock’s insider trading shows 15 sales on the open market for an estimated $67.27M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Ridloff Elena CFO | Award | 47,268 | — | — | 55.1% | 133,069 | Sep 17, 2026 | — | Form 4 |
| Cloonan Michael CEO | Award | 109,025 | — | — | 16.6% | 765,393 | Sep 17, 2026 | — | Form 4 |
| RA CAPITAL MANAGEMENT, L.P. Director | Sell | 3,415,011 | $6.32 | $21.58M | 49.5% | 3,482,612 | Sep 17, 2026 | — | Form 4 |
| RA CAPITAL MANAGEMENT, L.P. Director | Sell | 33,800 | $7.46 | $252.15K | 1.0% | 3,448,812 | Sep 17, 2026 | — | Form 4 |
| Fitzpatrick Jennifer Other | Award | 28,133 | — | — | New | 28,133 | Sep 17, 2026 | — | Form 4 |
| Fitzpatrick Jennifer Other | Award | 28,132 | — | — | 100.0% | 56,265 | Sep 17, 2026 | — | Form 4 |
| McKee Charlotte Other | Award | 50,000 | — | — | 176% | 78,415 | Sep 17, 2026 | — | Form 4 |
| McKee Charlotte Other | Award | 50,000 | — | — | 63.8% | 128,415 | Sep 17, 2026 | — | Form 4 |
| Ridloff Elena CFO | Award | 47,269 | — | — | 123% | 85,801 | Sep 17, 2026 | — | Form 4 |
| Cloonan Michael CEO | Award | 109,025 | — | — | 19.9% | 656,368 | Sep 17, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 85,918 | $44.86 | $3.85M | 3.4% | 2,469,959 | Jul 7, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 85,918 | $44.86 | $3.85M | 3.4% | 2,469,959 | Jul 7, 2026 | — | Form 4 |
| Fitzpatrick Jennifer Other | Option exercise | 10,250 | $6.11 | $62.63K | New | 10,250 | Jul 6, 2026 | — | Form 4 |
| Fitzpatrick Jennifer Other | Sell | 10,250 | $43.60 | $446.86K | 100% | 0 | Jul 6, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 115,844 | $45.50 | $5.27M | 4.3% | 2,555,877 | Jun 30, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 115,844 | $45.50 | $5.27M | 4.3% | 2,555,877 | Jun 30, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 101 | $44.49 | $4.49K | 0.0% | 2,671,721 | May 27, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 101 | $44.49 | $4.49K | 0.0% | 2,671,721 | May 27, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 184,639 | $46.22 | $8.53M | 6.5% | 2,671,822 | May 11, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 184,639 | $46.22 | $8.53M | 6.5% | 2,671,822 | May 11, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 59,767 | $44.58 | $2.66M | 2.0% | 2,856,461 | May 8, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 59,767 | $44.58 | $2.66M | 2.0% | 2,856,461 | May 8, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 48,546 | $44.61 | $2.17M | 1.6% | 2,916,228 | May 7, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 48,546 | $44.61 | $2.17M | 1.6% | 2,916,228 | May 7, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 2,948 | $44.52 | $131.24K | 0.1% | 2,964,774 | Apr 18, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 2,948 | $44.52 | $131.24K | 0.1% | 2,964,774 | Apr 18, 2026 | — | Form 4 |
| Thompson Peter A. Director | Sell | 52,397 | $44.68 | $2.34M | 1.7% | 2,967,722 | Apr 17, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 52,397 | $44.68 | $2.34M | 1.7% | 2,967,722 | Apr 17, 2026 | — | Form 4 |
| ORBIMED ADVISORS LLC Director | Sell | 226,906 | $45.34 | $10.29M | 7.0% | 3,020,119 | Apr 16, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Award (A) — Grant or award from the company, not a purchase
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.