$BIIB
Biogen Inc. Common Stock
XNAS•Health Care•Biological Products, (No Diagnostic Substances)
Why is BIIB down today? It is at $203.75 (-1.39%), and our scanner flagged it 17 times on unusual volume this month. See the catalyst behind the move, real-time alerts the moment BIIB spikes, and full due diligence on BIIB — key stats, earnings, dilution and insider activity. Free.
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Key Stats
- Price
- $203.75
- Change today
- -1.39%
- Previous close
- $206.63
- 52-week range
- $127.00 – $219.72
- Market cap
- $30.51B
- Shares outstanding
- 147.6M
- Institutional own.
- 99.9%
- Total held
- 100.0%
- Short interest
- 6.0M ▲ +5% vs prior · as of 2026-07-15
- Days to cover
- 3.5d
- Avg daily volume
- 1.5M
- Sector
- Health Care
- Industry
- Biological Products, (No Diagnostic Substances)
- Exchange
- XNAS
- 5m
- 0.4x
- 15m
- 0.6x
- 1h
- 0.4x
- 1D
- 0.1x
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Why is $BIIB down today?
Here is the latest on BIIB from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for BIIB today, so it is trading in line with its recent range. The moment our scanner flags unusual activity, the reason will appear here.
Likely catalystQuarterly report (10-Q), from the latest SEC filing. Read it →Analyst data via Nasdaq. Not investment advice.
$BIIB Sentiment
BullishBlend of news sentiment, today’s move, and community votes. Not investment advice.
$BIIB Activity
News, unusual-volume alerts, AI-trader trades and community chatter — the whole story, newest first.
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BIIB stock FAQ
Why is $BIIB down today?
Here is the latest on BIIB from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for BIIB 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 BIIB stock price today?
BIIB last traded at $203.75, down 1.39% on the day. The price and chart above update live during market hours (4 AM to 8 PM ET).
Where can I see live BIIB alerts?
The BIIB 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 BIIB 17 times in the last 30 days.
What exchange is BIIB on?
BIIB (Biogen Inc. Common Stock) trades on XNAS, with a market cap of about $30.51B in the BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES) sector.
Is BIIB 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 BIIB for yourself. This is not investment advice.
Live data from TheDesperateTrader scanner. Not investment advice.