SION insider buying
1 cluster buySionna Therapeutics, Inc. · Healthcare
When two or more insiders at Sionna Therapeutics, Inc. buy SION on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in SION plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.
Detected clusters
- Feb 10 – Feb 10, 2025Detected Feb 10, 20256 insidersTotal bought$62.5MMarket cap$1.9B
All notable open-market buys in SION
Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Jun 27, 2025 | 10% Owner | 60,000 | $15.84 | $950.4K | SEC ↗ |
| Feb 10, 2025 | TPG GP A, LLCcluster 10% Owner | 1,125,000 | $18.00 | $20.3M | SEC ↗ |
| Feb 10, 2025 | RA CAPITAL MANAGEMENT, L.P.cluster Director, 10% Owner | 1,022,586 | $18.00 | $18.4M | SEC ↗ |
| Feb 10, 2025 | OrbiMed Capital GP VIII LLCcluster Director | 550,000 | $18.00 | $9.9M | SEC ↗ |
| Feb 10, 2025 | Thompson Peter A.cluster Director | 550,000 | $18.00 | $9.9M | SEC ↗ |
| Feb 10, 2025 | RA CAPITAL MANAGEMENT, L.P.cluster Director, 10% Owner | 102,414 | $18.00 | $1.8M | SEC ↗ |
| Feb 10, 2025 | Atlas Venture Fund XI, L.P.cluster 10% Owner | 60,000 | $18.00 | $1.1M | SEC ↗ |
| Feb 10, 2025 | Booth Brucecluster Director | 60,000 | $18.00 | $1.1M | SEC ↗ |
More Healthcare stocks with insider cluster buys
SION insider buying — FAQ
- Are insiders buying SION stock?
- Yes — 7 distinct insiders have bought SION (Sionna Therapeutics, Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was Jul 1, 2025.
- How much SION stock have insiders bought?
- Insiders have bought a combined $63.4M of SION across 8 open-market purchases, based on SEC Form 4 filings.
- What is an insider cluster buy in SION?
- A cluster buy is two or more distinct Sionna Therapeutics, Inc. insiders — officers, directors, or 10% owners — each buying SION on the open market within a rolling window. SION has 1 detected cluster buy to date.
- Where does this SION insider trading data come from?
- Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.
How we track insider buying in SION
We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy SION within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?
This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding SION.