PurchasesCluster BuysBig Buys $500k+SalesMarket Trades More views → Custom filter →

Cluster buy

SION Insider Cluster Buy, February 2025

19 insiders at Sionna Therapeutics, Inc. bought a combined $219.5M between Feb 10, 2025 and Feb 15, 2025. Learn more

Feed status Last SEC check:Loading Last Filing: Loading
View SION
Access Free feed
Quick read What does this view show?

What this is

Single filing record

This page shows the rows from one Form 4 filing as reported to the SEC.

Why it matters

Read the SEC filing

The original SEC document is the source record. Always verify before drawing conclusions.

How to read it

Role, size, timing

Insider activity carries more weight from senior officers, large dollar values, and clustered timing.

Cluster BuySION

19 insiders at Sionna Therapeutics, Inc.

$219.5M

Cluster of 19 insiders bought a combined $219.5M of SION between Feb 10, 2025 and Feb 15, 2025.

Filed February 12, 2025

Timeline

When each insider bought

Feb 10, 2025 – Feb 15, 2025

  1. Feb 10, 2025Tpg Gp A, LLC10% Owner$20.3M
  2. Feb 10, 2025James G Coulter10% Owner$20.3M
  3. Feb 10, 2025Jon Winkelried10% Owner$20.3M
  4. Feb 10, 2025Orbimed Advisors LLCDirector$9.9M
  5. Feb 10, 2025OrbiMed Capital Gp VIII LLCDirector$9.9M
  6. Feb 10, 2025Peter A ThompsonDirector$9.9M
  7. Feb 10, 2025Bruce BoothDirector$1.1M
  8. Feb 10, 2025Atlas Venture Opportunity Fund II, LP10% Owner$1.1M
  9. Feb 10, 2025Atlas Venture Associates Xi, LLC10% Owner$1.1M
  10. Feb 10, 2025Atlas Venture Fund Xi, LP10% Owner$1.1M
  11. Feb 10, 2025Ra Capital Nexus Fund, LPDirector$1.8M
  12. Feb 10, 2025Ra Capital Healthcare Fund LPDirector$1.8M
  13. Feb 10, 2025Ra Capital Management, LPDirector$1.8M
  14. Feb 10, 2025Ra Capital Management, LPDirector$18.4M
  15. Feb 10, 2025Rajeev M ShahDirector$18.4M
  16. Feb 10, 2025Ra Capital Nexus Fund III, LPDirector$18.4M
  17. Feb 10, 2025Ra Capital Nexus Fund III, LPDirector$1.8M
  18. Feb 10, 2025Atlas Venture Associates Xi, LP10% Owner$1.1M
  19. Feb 10, 2025Atlas Venture Associates Opportunity II, LLC10% Owner$1.1M
  20. Feb 10, 2025Atlas Venture Associates Opportunity II, LP10% Owner$1.1M
  21. Feb 10, 2025Peter KolchinskyDirector$1.8M
  22. Feb 10, 2025Ra Capital Healthcare Fund LPDirector$18.4M
  23. Feb 10, 2025Ra Capital Nexus Fund, LPDirector$18.4M
  24. Feb 10, 2025Rajeev M ShahDirector$1.8M
  25. Feb 10, 2025Peter KolchinskyDirector$18.4M

Market context

SION market snapshot

Current price$36.73
1-day change+5.70%
Market cap$1.93B
SectorHealthcare
Next earningsAugust 3, 2026
$36.73
52-week low $13.8152-week high $48.44
Current price$36.73
Analyst target$51.60 (+20.5%)

Last enriched June 20, 2026 at 7:34 AM EDT.

Filings

Transactions in This Cluster

Each row is an open-market purchase reported within the cluster window. Every row links to the original SEC Form 4 filing.

Status Loading

Loading public insider data...

Latest visible filing loading.

Public Form 4 filings, normalized for cleaner scanning. What do these codes mean?

TickerType & RoleValue

Share

Share this story

19 insiders bought a combined $219,510,000 of SION in 5 days. SEC Form 4 source linked.

Weekly recap

Get the easier version in your inbox.

Start with the free weekly recap. Upgrade later if you want the paid daily brief.

Free weekly recap. No login required. Unsubscribe any time.

Method Public Form 4 filings, normalized for cleaner scanning. Filtered rows stay available in All Form 4 Filings and ticker history. Which view should I use? →