SION · Sionna Therapeutics, Inc. · Proposed Sales
$8.28
+0.43 (+5.41%)
At close · Sep 14
Going-concern doubt
— cleared Aug 6, 2026
The latest filing states the doubt was alleviated.
“The Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that these condensed consolidated financial statements are issued. The Company believes that its existing cash, cash equivalents and marketable securities of $268.3 million as of June 30, 2026, will be sufficient to allow the Company to fund operations beyond twelve months from the date that the financial statements are issued.”View the 10-Q filed Aug 6, 2026
Market Cap
$354.92M
Shares
45.21M
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 |
|---|---|---|---|---|---|
| 2026-07-06 | JENNIFER FITZPATRICK | Officer | 10,250 | 2026-07-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 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 |
Showing 1–50 of 67 filings