SION
Sionna Therapeutics, Inc.Company with tickers: SION
CIK
2036042
CUSIP
829401108
Shares Outstanding
45,150,330
Website
https://www.sionnatx.com
13F Activity (30d)
7 filings
6 filers
Notices of intent to sell restricted or control shares, filed with the SEC on Form 144 by insiders and affiliates. A Form 144 signals a planned sale — it does not confirm the shares were actually sold.
| Filed | Seller | Relationship | Shares | Approx. Sale | Broker |
|---|---|---|---|---|---|
| 2026-05-29 | OrbiMed Private Investments VIII, LP | Shareholder | 1,082,480 | 2026-05-29 | TD Cowen |
| 2026-03-05 | JENNIFER FITZPATRICK | Officer | 10,250 | 2026-03-05 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-22 | Rise Fund Sling II, L.P. | Stockholder | 54,333 | 2026-01-22 | Goldman Sachs & Co. LLC |
| 2026-01-22 | Rise Fund Sling, L.P. | Stockholder | 195,667 | 2026-01-22 | Goldman Sachs & Co. LLC |
| 2025-12-05 | JENNIFER R FITZPATRICK | Officer | 10,250 | 2025-12-05 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-24 | OrbiMed Private Investments VIII, LP | Shareholder | 1,047,770 | 2025-11-24 | TD Cowen |
| 2025-11-21 | BLACKWELL PARTNERS LLC - SERIES A | Director, 10% Stockholder | 7,609 | 2025-11-21 | BTIG, LLC |
| 2025-11-21 | RA Capital Healthcare Fund LP | Director, 10% Stockholder | 1,210 | 2025-11-21 | BTIG, LLC |
| 2025-11-21 | RA Capital Nexus Fund III, L.P. | Director, 10% Stockholder | 6,440 | 2025-11-21 | BTIG, LLC |
| 2025-11-21 | RA Capital Nexus Fund, L.P. | Director, 10% Stockholder | 9,924 | 2025-11-21 | BTIG, LLC |
| 2025-11-20 | RA Capital Nexus Fund, L.P. | Director, 10% Stockholder | 2,023 | 2025-11-20 | BTIG, LLC |
| 2025-11-20 | RA Capital Healthcare Fund LP | Director, 10% Stockholder | 246 | 2025-11-20 | BTIG, LLC |
| 2025-11-20 | RA Capital Nexus Fund III, L.P. | Director, 10% Stockholder | 1,313 | 2025-11-20 | BTIG, LLC |
| 2025-11-20 | BLACKWELL PARTNERS LLC - SERIES A | Director, 10% Stockholder | 1,551 | 2025-11-20 | BTIG, LLC |
| 2025-11-19 | BLACKWELL PARTNERS LLC - SERIES A | Director, 10% Stockholder | 14,334 | 2025-11-19 | BTIG, LLC |
| 2025-11-19 | RA Capital Nexus Fund, L.P. | Director, 10% Stockholder | 18,696 | 2025-11-19 | BTIG, LLC |
| 2025-11-19 | RA Capital Healthcare Fund LP | Director, 10% Stockholder | 2,278 | 2025-11-19 | BTIG, LLC |
| 2025-11-19 | RA Capital Nexus Fund III, L.P. | Director, 10% Stockholder | 12,134 | 2025-11-19 | BTIG, LLC |
| 2025-11-18 | RA Capital Nexus Fund III, L.P. | Director, 10% Stockholder | 1,770 | 2025-11-18 | BTIG, LLC |
| 2025-11-18 | RA Capital Healthcare Fund LP | Director, 10% Stockholder | 332 | 2025-11-18 | BTIG, LLC |
| 2025-11-18 | BLACKWELL PARTNERS LLC - SERIES A | Director, 10% Stockholder | 2,092 | 2025-11-18 | BTIG, LLC |
| 2025-11-18 | RA Capital Nexus Fund, L.P. | Director, 10% Stockholder | 2,728 | 2025-11-18 | BTIG, LLC |
| 2025-11-17 | RA Capital Nexus Fund III, L.P. | Director, 10% Stockholder | 20,969 | 2025-11-17 | BTIG, LLC |
| 2025-11-17 | BLACKWELL PARTNERS LLC - SERIES A | Director, 10% Stockholder | 24,772 | 2025-11-17 | BTIG, LLC |
| 2025-11-17 | RA Capital Nexus Fund, L.P. | Director, 10% Stockholder | 32,310 | 2025-11-17 | BTIG, LLC |
| 2025-11-17 | RA Capital Healthcare Fund LP | Director, 10% Stockholder | 3,936 | 2025-11-17 | BTIG, LLC |
| 2025-10-28 | BLACKWELL PARTNERS LLC - SERIES A | Director, 10% Stockholder | 10,476 | 2025-10-28 | BTIG, LLC |
| 2025-10-28 | RA Capital Nexus Fund III, L.P. | Director, 10% Stockholder | 17,118 | 2025-10-28 | BTIG, LLC |
| 2025-10-28 | RA Capital Nexus Fund, L.P. | Director, 10% Stockholder | 31,392 | 2025-10-28 | BTIG, LLC |
| 2025-10-28 | RA Capital Healthcare Fund LP | Director, 10% Stockholder | 3,624 | 2025-10-28 | BTIG, LLC |
| 2025-10-24 | RA Capital Nexus Fund, L.P. | Director, 10% Stockholder | 122,271 | 2025-10-24 | BTIG, LLC |
| 2025-10-24 | RA Capital Healthcare Fund LP | Director, 10% Stockholder | 14,116 | 2025-10-24 | BTIG, LLC |
| 2025-10-24 | BLACKWELL PARTNERS LLC - SERIES A | Director, 10% Stockholder | 107,941 | 2025-10-24 | BTIG, LLC |
| 2025-10-24 | RA Capital Nexus Fund III, L.P. | Director, 10% Stockholder | 66,672 | 2025-10-24 | BTIG, LLC |
| 2025-10-21 | MICHAEL CLOONAN | Director, Officer | 99,800 | 2025-10-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-21 | Atlas Venture Fund XI, LP | Shareholder | 73,460 | 2025-10-21 | Merrill Lynch |
| 2025-10-21 | Atlas Venture Opportunity Fund II, L.P. | Shareholder | 15,418 | 2025-10-21 | Merrill Lynch |
| 2025-10-20 | Atlas Venture Opportunity Fund II, L.P. | Shareholder | 9,712 | 2025-10-20 | Merrill Lynch |
| 2025-10-20 | Atlas Venture Fund XI, LP | Shareholder | 46,273 | 2025-10-20 | Merrill Lynch |
| 2025-10-17 | Atlas Venture Fund XI, LP | Shareholder | 50,520 | 2025-10-17 | Merrill Lynch |
| 2025-10-17 | Atlas Venture Opportunity Fund II, L.P. | Shareholder | 10,604 | 2025-10-17 | Merrill Lynch |
| 2025-10-16 | Atlas Venture Fund XI, LP | Shareholder | 139,897 | 2025-10-16 | Merrill Lynch |
| 2025-10-16 | MICHAEL CLOONAN | Director, Officer | 200 | 2025-10-16 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-16 | Atlas Venture Opportunity Fund II, L.P. | Shareholder | 29,363 | 2025-10-16 | Merrill Lynch |
| 2025-10-15 | MICHAEL CLOONAN | Director, Officer | 25,000 | 2025-10-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-14 | Atlas Venture Opportunity Fund II, L.P. | Shareholder | 10,102 | 2025-10-13 | Merrill Lynch |
| 2025-10-14 | Atlas Venture Fund XI, LP | Shareholder | 48,130 | 2025-10-13 | Merrill Lynch |
| 2025-10-10 | Atlas Venture Opportunity Fund II, L.P. | Shareholder | 3,511 | 2025-10-10 | Merrill Lynch |
| 2025-10-10 | Atlas Venture Fund XI, LP | Shareholder | 16,727 | 2025-10-10 | Merrill Lynch |
| 2025-10-06 | Atlas Venture Opportunity Fund II, L.P. | Shareholder | 2,047 | 2025-10-06 | Merrill Lynch |
Showing 1–50 of 66 filings