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$SION

Sionna Therapeutics, Inc. Common Stock

XNAS•Health Care•Pharmaceutical Preparations

$5.27
▼-4.53%-$0.250
RVOL peak today
Normal
Halted today
None today
Float
ultra-low
Next earnings
Unscheduled
$5.27-4.53%−$0.2500Prev $5.52LIVE Full chart Live alerts
No recent price bars, the chart lights up when SION starts printing.

Why is SION down today? It is at $5.27 (-4.53%), and our scanner flagged it 225 times on unusual volume this month. See the catalyst behind the move, real-time alerts the moment SION spikes, and full due diligence on SION — key stats, earnings, dilution and insider activity. Free.

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Our scanner flagged $SION 225 times in the last 30 days. Create a free account to track $SION, build a watchlist, and get instant unusual-volume alerts, with a full day of premium now and 5 more when you verify your email, no card needed.

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Key Stats

Price & performance
Price
$5.27
Change today
-4.53%
Previous close
$5.52
52-week range
$4.01 – $54.97
Valuation & dividend
Market cap
$239M
Ownership & volume
Shares outstanding
45.2M
SEC · as of 2026-07-31 · 22d ↗
Insider ownership
3.7%
DEF 14A · 2025-04-29 ↗
Institutional own.
99.9%
Total held
100.0%
Short interest
4.2M
▼ -20% vs prior · as of 2026-07-31
Days to cover
6.8d
Avg daily volume
679K
Classification
Sector
Health Care
Industry
Pharmaceutical Preparations
Exchange
XNAS
Relative volumevs this time of day
5mthin
0.5x
15mthin
0.5x
1hthin
0.8x
1D
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Why is $SION down today?

Here is the latest on SION from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for SION today, so it is trading in line with its recent range. The moment our scanner flags unusual activity, the reason will appear here.

Likely catalystClinical / FDA update, from the latest SEC filing. Read it →
Why is $SION moving? →▶ Replay the moveAuto-generated from live scanner data. Not investment advice.
Trading profile⚡ Ultra-low floatShortableEasy to borrowNo SSRBorrow via Alpaca · SSR from Reg SHO 201

$SION Sentiment

Neutral
Bearish52Bullish
📰 News: 3 bull · 1 bearToday: -4.5%👥 Community: 0 bull · 0 bear

Blend of news sentiment, today’s move, and community votes. Not investment advice.

$SION Activity

News, unusual-volume alerts, AI-trader trades and community chatter - the whole story, newest first.

Alert· 1d ago -2.1% vs EMA
$SION near 200 EMA: -2.09% from 200 EMA at 7:19 PM ET
at $5.28
Alert· 1d ago 7.4× RVOL
SION hit 7.431x RVOL at 7:19 PM ET
at $5.28
Alert· 1d ago -1.4% vs EMA
$SION near 200 EMA: -1.39% from 200 EMA at 12:52 PM ET
at $5.45
Alert· 1d ago 4.5× RVOL
SION hit 4.447x RVOL at 12:52 PM ET
at $5.45
Alert· 1d ago +1.18%
$SION moved +1.18% in 1 min (Level 1) at 9:09 AM ET
at $5.54
News· The Motley Fool· 2d ago Bearish
Vertex Pharmaceuticals' Rally Has a New Engine -- and Wall Street Thinks the Best Is Still Ahead
Alert· 2d ago 2.9× RVOL
SION hit 2.902x RVOL at 10:33 AM ET
at $5.69
Alert· 3d ago +3.4% vs EMA
SION 200EMA (5m) Trending · 75 bars · L3 · +3.35% above EMA · slope +0.50%
at $6.17
Alert· 3d ago +0.5% vs EMA
$SION near 200 EMA: +0.50% from 200 EMA at 12:47 PM ET
at $6.03
Alert· 3d ago +1.25%
$SION moved +1.25% in 1 min (Level 1) at 12:47 PM ET
at $6.03
Alert· 3d ago +2.40%
$SION moved +2.40% in 1 min (Level 2) at 8:48 AM ET
at $5.87
Alert· 4d ago +2.1% vs EMA
SION 200EMA (1m) Trending · 123 bars · L4 · +2.06% above EMA · slope +0.32%
at $5.94
Alert· 4d ago +2.2% vs EMA
$SION near 200 EMA: +2.17% from 200 EMA at 4:09 PM ET
at $5.94
Alert· 4d ago -1.65%
$SION moved -1.65% in 1 min (Level 1) at 4:09 PM ET
at $5.84
Alert· 4d ago 9.3× RVOL
SION hit 9.305x RVOL at 4:09 PM ET
at $5.94
Alert· 4d ago +1.0% vs EMA
SION 50EMA (1m) Trending · 128 bars · L4 · +0.98% above EMA · slope +0.45%
at $5.94
Alert· 4d ago +1.0% vs EMA
SION 50EMA (1m) Trending · 128 bars · L4 · +0.98% above EMA · slope +0.45%
at $5.94
Alert· 4d ago 3.1× RVOL
SION hit 3.057x RVOL at 1:37 PM ET
at $5.83
Alert· 5d ago -1.09%
$SION moved -1.09% in 1 min (Level 1) at 2:02 PM ET
at $5.99
Alert· 5d ago 2.0× RVOL
SION hit 2.000x RVOL at 12:59 PM ET
at $6.14
Alert· 5d ago +2.02%
$SION moved +2.02% in 1 min (Level 2) at 12:49 PM ET
at $6.25
Alert· 5d ago +1.27%
$SION moved +1.27% in 1 min (Level 1) at 12:21 PM ET
at $6.40
Alert· 5d ago -2.88%
$SION moved -2.88% (~15m high-low range 2.88%) (Level 2) at 4:30 AM ET
at $6.20
Alert· 8d ago -1.4% vs EMA
$SION near 200 EMA: -1.38% from 200 EMA at 4:16 PM ET
at $6.35
Alert· 8d ago -1.10%
$SION moved -1.10% in 1 min (Level 1) at 4:16 PM ET
at $6.35
Alert· 8d ago 2.0× RVOL
SION hit 2.000x RVOL at 3:59 PM ET
at $6.47
News· SEC EDGAR· 12d ago
Sionna Therapeutics Reports Topline Data from Two Development Programs in Cystic Fibrosis and Provides
News· SEC EDGAR· 16d ago
Sionna Therapeutics, Inc.: Q2 FY2026 results, three months to Jun 30, 2026
News· SEC EDGAR· 16d ago
Sionna Therapeutics, Inc. filed an 8-K: Results of Operations
News· SEC EDGAR· 65d ago
Sionna Therapeutics, Inc. filed an 8-K: Shareholder Vote
News· GlobeNewswire Inc.· 87d ago Bullish
Sionna Therapeutics to Participate in Upcoming June 2026 Investor Conferences
News· GlobeNewswire Inc.· 101d ago Bullish
Sionna Therapeutics to Participate in the 2026 RBC Capital Markets Global Healthcare Conference
News· The Motley Fool· 117d ago Bullish
Sionna Insider Sells $2.5 Million in Stock Amid 215% Surge, but Here's What Investors Should Watch

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SION stock FAQ

Why is $SION down today?

Here is the latest on SION from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for SION today, so it is trading in line with its recent range. The moment our scanner flags unusual activity, the reason will appear here.

What is the SION stock price today?

SION last traded at $5.27, down 4.53% on the day. The price and chart above update live during market hours (4 AM to 8 PM ET).

Where can I see live SION alerts?

The SION Live Alerts panel on this page streams real-time unusual volume (RVOL), momentum, halt and 200-EMA alerts from our scanner the moment they fire. Our scanner has flagged SION 225 times in the last 30 days.

What exchange is SION on?

SION (Sionna Therapeutics, Inc. Common Stock) trades on XNAS, with a market cap of about $239M in the PHARMACEUTICAL PREPARATIONS sector.

Is SION good for day trading?

That depends on your strategy and risk. Day traders look for volume, volatility and a clear trend. Use the live chart, RVOL alerts and 200-EMA context on this page to judge SION for yourself. This is not investment advice.

Live data from TheDesperateTrader scanner. Not investment advice.