What is SION's dilution risk score?

SION has a latest available DilutionScore record of 52/100, categorized as high dilution risk by the DilutionWatch scoring model. DilutionWatch displays SEC filing and dilution indicators for SION, including shelf registrations, ATM offerings, warrant exercises, PIPE deals, and reverse split signals when detected in source data.

What SEC filings does DilutionWatch track for SION?

DilutionWatch tracks 25 SEC filing types for SION including S-3 shelf registrations, 424B prospectuses (ATM offerings), S-1 registration statements, 8-K material events, warrant exercise notices, convertible note agreements, and Form 4 insider transactions. Alerts are delivered via email within minutes of a filing appearing on EDGAR.

How does stock dilution affect SION shareholders?

Stock dilution occurs when a company issues new shares, reducing the ownership percentage of existing shareholders. For SION, common dilution events include at-the-market (ATM) stock offerings, shelf registration drawdowns, warrant exercises, and convertible note conversions. Each event increases the share count and can pressure the stock price lower.

Is DilutionWatch free for SION tracking?

DilutionWatch provides a free tier that shows DilutionScores and basic filing history for SION. Premium plans ($19.95/month Basic, $39.95/month Premium) unlock real-time email alerts, the full Pulse™ feed, advanced dilution forecasts, and access to all 10,000+ tracked tickers.

SION Dilution Risk Score: 52/100 (HIGH)

Score Breakdown

📋 Offering Ability

40

💰 Cash Runway

65

📊 Float Risk

70

⚠️ Warrant Exposure

40

🔄 Convertible Debt

40

Dilution Forecast

☀️

Clear

No significant dilution signals

model est. 7%

💰 Capital Raise model 15%

• Under 12 months cash (12mo)

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Market Data

Market Cap$1.93B

Shares Outstanding45.21M

Float16.80M

Cash$63.32M

Debt$8.38M

Short InterestN/A

Institutional Holdings

QoQ: ↑ 8.0% shares (2026Q1 vs prior)

122 institutional holders · 47.47M shares

#1 RA CAPITAL MANAGEMENT, L.P. 9.91M shares

#2 TPG GP A, LLC 6.49M shares

#3 ORBIMED ADVISORS LLC 3.53M shares

+ 17 more holders Sign up free to view →

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

Short Interest4.20M

Days to Cover6.8

% of Float25.0%

FINRA data as of Jul 31, 2026

Insider Buy/Sell Ratio

Recent SEC Activity

xbrl XBRL CONVERTIBLE 2025-12-31

Full SEC filing analysis available with free account →

Recent News

No recent news

Factual SION Dilution Snapshot

Sionna Therapeutics, Inc. (SION) has a DilutionScore of 52/100, rated High dilution risk. Score date: August 28, 2026.

Recent SEC activity tracked for SION: xbrl on 2025-12-31.

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.