Elena Ridloff - 02 Jan 2026 Form 4 Insider Report for Sionna Therapeutics, Inc. (SION)

Reporting relationship: CFO
Issuer ticker: SION
Reported as of: 02 Jan 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Jan 2026, 16:11:05 UTC
Prior SEC filing: 03 Sep 2025
Next SEC filing: 01 Apr 2026
Source filing: View source filing
Reporting owner signature: Jennifer Fitzpatrick, Attorney-in-Fact

Key filing fact

Elena Ridloff filed Form 4 for Sionna Therapeutics, Inc. (SION) on 06 Jan 2026.

Key facts

This page summarizes Elena Ridloff's Form 4 filing for Sionna Therapeutics, Inc. (SION).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 06 Jan 2026, 16:11.

Change

Previous filing in this sequence was filed on 03 Sep 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001772518 Primary reporting owner

Ridloff Elena

Relationship: CFO
Address: C/O SIONNA THERAPEUTICS, INC., 21 HICKORY DRIVE, SUITE 500, WALTHAM
Signature: Jennifer Fitzpatrick, Attorney-in-Fact
Signature date: 06 Jan 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SION transaction Derivative

Non-Qualified Stock Option (right to buy)

Award

Transaction value: $0
Shares: +165,440
Change %
Price: $0.000000
Shares after: 165,440
Date: 02 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 165,440
Exercise price: $39.21
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The shares underlying this option vest in forty-eight equal monthly installments following January 2, 2026, subject to the Reporting Person's continued service on each such vesting date.