Form 144 - Report of proposed sale of securities:
SEC Accession No. 0001178937-25-000058
Filing Date
2025-10-28
Accepted
2025-10-28 17:13:30
Documents
1

Document Format Files

Seq Description Document Type Size
1 primary_doc.html 144  
1 primary_doc.xml 144 3442
  Complete submission text file 0001178937-25-000058.txt   5071
Mailing Address 200 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116
Business Address 200 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 617-778-2500
RA Capital Nexus Fund III, L.P. (Reporting) CIK: 0001883840 (see all company filings)

EIN.: 872206582 | State of Incorp.: DE | Fiscal Year End: 1231
Type: 144

Mailing Address 21 HICKORY DRIVE, SUITE 500 WALTHAM MA 02451
Business Address 21 HICKORY DRIVE, SUITE 500 WALTHAM MA 02451 617-819-2020
Sionna Therapeutics, Inc. (Subject) CIK: 0002036042 (see all company filings)

EIN.: 000000000 | State of Incorp.: DE | Fiscal Year End: 1231
Type: 144 | Act: 33 | File No.: 001-42504 | Film No.: 251425827
SIC: 2834 Pharmaceutical Preparations
(CF Office: 03 Life Sciences)