OQROGet OQRO Pro
Insider trade

Sionna Therapeutics (SION)CFO sold ~$418K

Elena Ridloff, CFO at Sionna Therapeutics, sold ~$418K of Sionna Therapeutics shares.

~$418K
Approx. value · 16K sh @ $25.97
48K
Holds after · shares reported
Traded
Aug 28, 2025
Filed
Aug 28, 2025

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

  1. Jun 27, 2025Insider10% owner purchased ~$950K of SION shares in the open market
  2. Aug 19, 2025InsiderCFO sold ~$727K of SION shares in the open market
  3. Aug 20, 2025Insider · 2 peopleInsiders: 2 sales (~$966K)
  4. Aug 26, 2025Insider · 2 peopleInsiders: 2 sales (~$532K)
  5. Aug 27, 2025Insider · 2 peopleInsiders: 2 sales (~$277K)
  6. Aug 28, 2025 · this disclosureInsiderCFO sold ~$418K of SION shares in the open market

What came next

  1. Aug 29, 2025InsiderCFO sold ~$19K of SION shares in the open market
  2. Sep 2, 2025InsiderCFO sold ~$222K of SION shares in the open market
  3. Sep 4, 2025InsiderOfficer sold ~$237K of SION shares in the open market
  4. Sep 26, 2025InsiderCEO sold ~$496K of SION shares in the open market
  5. Sep 29, 2025InsiderCEO sold ~$231K of SION shares in the open market
  6. Nov 5, 2025Company filing · Form 8-K · ResultsReported its results
View the official recordSEC Form 4

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Sionna Therapeutics

For Sionna Therapeutics, OQRO holds 5 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its SION page.

Other recent filings by Elena Ridloff, CFO & Head of Corp. Dev.

The full history of Elena Ridloff, CFO & Head of Corp. Dev. is on the profile page.

How this filing works

Other disclosures at Sionna Therapeutics

Everything OQRO holds on this company is on its SION page.

This is one filing. OQRO holds the rest

Insider trades filed with the SEC, stock trades disclosed by members of Congress, fund holdings from 13F filings and federal contract awards, each one in plain words next to its official filing. On this page it opens why the trade stands out, what the company did around that time, the price since, and every field of the form.

Unlock OQRO ProAlready have an account? Log in

OQRO Pro is a paid subscription. You see the price before you pay

OQRO describes public disclosures and context calculated from them. It does not give personalized advice and does not recommend any transaction. How OQRO treats data