Sionna Therapeutics, Inc. (SION) insider trading.
In Q3 2026, insiders at Sionna Therapeutics, Inc. reported 16 non-derivative transactions on 10 Forms 3, 4 and 5: 0 open-market purchases and 7 sales worth $40.5M.
- Transactions
- 16
- Purchases (P)
- 0
- Sales (S)
- 7
- Net shares, P minus S
- -3,862,585
- Insiders
- 8
- Last filed
- 2026-09-21
Insiders
| Insider | Relationship | Transactions | Buys | Sales |
|---|---|---|---|---|
| Fitzpatrick Jennifer | Officer · CLO and Head of Program Mgmt. | 4 | 0 | 1 |
| RA CAPITAL MANAGEMENT, L.P. / RA Capital Healthcare Fund LP / RA Capital Nexus Fund III, L.P. / Shah Rajeev M. / RA Capital Nexus Fund, L.P. / Kolchinsky Peter | Director, TenPercentOwner | 2 | 0 | 2 |
| Cloonan Michael | Director, Officer · President & CEO | 2 | 0 | 0 |
| Ridloff Elena | Officer · CFO and CBO | 2 | 0 | 0 |
| McKee Charlotte | Officer · CMO and Head of R&D | 2 | 0 | 0 |
| Thompson Peter A. | Director | 2 | 0 | 2 |
| OrbiMed Capital GP VIII LLC / ORBIMED ADVISORS LLC | Director | 1 | 0 | 1 |
| ORBIMED ADVISORS LLC / OrbiMed Capital GP VIII LLC | Director | 1 | 0 | 1 |
Transactions
| Date | Insider | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| 2026-09-17 | RA CAPITAL MANAGEMENT, L.P. / RA Capital Healthcare Fund LP / RA Capital Nexus Fund III, L.P. / Shah Rajeev M. / RA Capital Nexus Fund, L.P. / Kolchinsky Peter | S (D) | 3,415,011 | $6.32 | 3,482,612 | Form 4 |
| 2026-09-17 | RA CAPITAL MANAGEMENT, L.P. / RA Capital Healthcare Fund LP / RA Capital Nexus Fund III, L.P. / Shah Rajeev M. / RA Capital Nexus Fund, L.P. / Kolchinsky Peter | S (D) | 33,800 | $7.46 | 3,448,812 | Form 4 |
| 2026-09-17 | Cloonan Michael | A (A) | 109,025 | $0 | 656,368 | Form 4 |
| 2026-09-17 | Cloonan Michael | A (A) | 109,025 | $0 | 765,393 | Form 4 |
| 2026-09-17 | Ridloff Elena | A (A) | 47,268 | $0 | 133,069 | Form 4 |
| 2026-09-17 | Ridloff Elena | A (A) | 47,269 | $0 | 85,801 | Form 4 |
| 2026-09-17 | McKee Charlotte | A (A) | 50,000 | $0 | 128,415 | Form 4 |
| 2026-09-17 | McKee Charlotte | A (A) | 50,000 | $0 | 78,415 | Form 4 |
| 2026-09-17 | Fitzpatrick Jennifer | A (A) | 28,132 | $0 | 56,265 | Form 4 |
| 2026-09-17 | Fitzpatrick Jennifer | A (A) | 28,133 | $0 | 28,133 | Form 4 |
| 2026-07-07 | OrbiMed Capital GP VIII LLC / ORBIMED ADVISORS LLC | S (D) | 85,918 | $44.86 | 2,469,959 | Form 4 |
| 2026-07-07 | Thompson Peter A. | S (D) | 85,918 | $44.86 | 2,469,959 | Form 4 |
| 2026-07-06 | Fitzpatrick Jennifer | M (A) | 10,250 | $6.11 | 10,250 | Form 4 |
| 2026-07-06 | Fitzpatrick Jennifer | S (D) | 10,250 | $43.6 | 0 | Form 4 |
| 2026-06-30 | ORBIMED ADVISORS LLC / OrbiMed Capital GP VIII LLC | S (D) | 115,844 | $45.5 | 2,555,877 | Form 4 |
| 2026-06-30 | Thompson Peter A. | S (D) | 115,844 | $45.5 | 2,555,877 | Form 4 |
Transaction codes in this quarter
Get SION insider transactions through the API
curl "https://sec-api.dev/api/v1/insider-transactions?period=2026q3&cik=2036042&limit=100" \
-H "Authorization: Bearer $SEC_API_KEY"Insider trading API guide · SION company page · Sionna Therapeutics, Inc. on SEC.gov
Questions
Are insiders buying or selling Sionna Therapeutics, Inc. (SION)?
In Q3 2026, insiders at Sionna Therapeutics, Inc. reported 16 non-derivative transactions on 10 Forms 3, 4 and 5: 0 open-market purchases and 7 sales worth $40.5M. Grants, tax withholding and option exercises are counted as transactions but are not purchases or sales.
Where do these Sionna Therapeutics, Inc. insider trades come from?
From the SEC Insider Transactions Data Sets for Q3 2026, which republish the Forms 3, 4 and 5 filed on EDGAR. Each row links to its filing on SEC.gov.
Plain-text version for agents and LLMs: /insider-trading/sion.md
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