Score Breakdown
Dilution Forecast
Market Data
Source-Backed Evidence Depth
This public preview uses stored DilutionWatch fields and linked SEC/market records only. Missing values are not estimated.
| Field | Current Value | Basis |
|---|---|---|
| DilutionScore | 52/100 | DilutionWatch score record |
| Shares Outstanding | 45.21M | Verified float table or market cache |
| Public Float | 16.80M | Verified float table or market cache |
| Market Cap | $212.05M | Market data cache |
| Cash Runway | 8.6 months | DilutionWatch score inputs |
| Shelf Capacity | None in current score inputs | SEC-derived dilution fields |
| ATM Capacity | None in current score inputs | SEC-derived dilution fields |
| Outstanding Warrants | None in current score inputs | SEC-derived dilution fields |
Recent source-backed SEC insight records available on this page: 1.
Recent SEC source mix: XBRL 1.
The page does not infer future share issuance, financing probability, cash needs, management intent, or price impact when source fields are absent.
Institutional Holdings
Institutional holder totals are aggregated from ownership filings and may use a different share basis or reporting date than public float. They are not a reconciliation against tradeable float.
Short Interest
Recent SEC Activity
Recent News
Factual SION Dilution Snapshot
Sionna Therapeutics, Inc. (SION) has a DilutionScore of 52/100, rated High dilution risk. Score date: October 13, 2026.
- Recent SEC activity tracked for SION: xbrl on 2026-03-02.
This automatically generated snapshot is assembled from stored DilutionWatch data fields and may contain data-source errors or omissions. It is not financial advice, not investment research, and not a recommendation. Do your own research and review the full disclaimer and terms of service.
DilutionScore History — Last 90 Days
SION's DilutionScore is currently 52/100 (High risk), with 2 score changes tracked over 89 days. The score deteriorated from 53/100 (High risk).
| Period | Score | Risk Level | Duration |
|---|---|---|---|
| Aug 22 – Oct 13, 2026 | 52/100 | HIGH | 53 days |
| Jul 17 – Aug 21, 2026 | 53/100 | HIGH | 35 days |
| Jul 16, 2026 | 52/100 | HIGH | 1 day |
Score recalculated daily from SEC filings and market data. Sign up free for real-time score change alerts.
Share Dilution History
SION shares outstanding have increased 1.2% from 44.63M (Mar 2026) to 45.15M (May 2026). Each increase represents potential dilution to existing shareholders.
| Date | Shares Outstanding | Public Float | Change |
|---|---|---|---|
| May 27, 2026 | 45.15M | 16.80M | ▲ 1.78% |
| May 17, 2026 | 45.15M | 16.50M | ▲ 0.03% |
| May 13, 2026 | 45.14M | 16.50M | ▲ 0.34% |
| May 02, 2026 | 45.14M | 16.44M | ▲ 0.56% |
| Apr 26, 2026 | 45.00M | 16.35M | ▲ 0.02% |
| Apr 24, 2026 | 45.00M | 16.35M | ▲ 3.57% |
| Mar 07, 2026 | 44.63M | 15.78M | ▲ 1.15% |
| Mar 05, 2026 | 44.63M | 15.60M | ▲ 0.40% |
Share counts sourced from verified regulatory filings. Increases indicate dilution events.
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