Current price
$209.74
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Biogen
BIIB
Why is Biogen stock moving today?
See what stands out in BIIB today: the price move, unusual volume, recent trend, and what to watch next. Unlock the full analysis for the deeper driver breakdown.
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Today vs prev close
-2.93%
Volume vs average
0.9x
Market cap
$31B
Why is BIIB stock up or down today?
Biogen (BIIB) is down 2.93% today at $209.74. Trading volume is running at about 0.9x its 3-month average, which suggests the move is drawing more attention than a routine session. The stock is trading near its 52-week high. Biogen sits in Drug Manufacturers - General within Healthcare.
Over the last five trading sessions, the stock is up 3.85%. Across the last month of trading data on this page, shares are up 11.07%. The next reported earnings date is Jul 29, 2026. The current mean analyst target on this page is $220.28.
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Is BIIB moving on unusual volume or trend strength?
Volume is near normal at roughly 0.9x the 3-month average. The stock is currently trading near its 52-week high. Five-session trend: +3.85%. Today's trading range spans $209.67 to $215.76.
See volume and trend context
What should investors watch next in BIIB stock?
Next reported earnings date: Jul 29, 2026. Previous close was $216.06, which is the cleanest baseline for judging whether today's move is extending or reversing momentum. Mean analyst target is $220.28; large gaps between current price and the target can keep sentiment-sensitive names volatile. One-month return sits at +11.07%, which gives context on whether today's move is part of a larger trend.
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Price action timeline
Use the chart to frame today's move inside the broader trend.
Price timeline
BIIB Performance
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This public page shows the frame: live market data, trend context, and the next catalyst to watch. The premium layer is where the ranked driver breakdown, filing signals, and watchlist tracking live.
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Common questions about BIIB stock today
Why is BIIB stock moving today?
Biogen (BIIB) is down 2.93% today at $209.74. Trading volume is running at about 0.9x its 3-month average, which suggests the move is drawing more attention than a routine session. The stock is trading near its 52-week high. Biogen sits in Drug Manufacturers - General within Healthcare. Over the last five trading sessions, the stock is up 3.85%. Across the last month of trading data on this page, shares are up 11.07%. The next reported earnings date is Jul 29, 2026. The current mean analyst target on this page is $220.28.
What happened to Biogen stock today?
Biogen stock is down 2.93% today, with the public page focusing on price action, trend, volume, and the next catalyst to watch.
Is BIIB moving on high volume today?
Volume is near normal at roughly 0.9x the 3-month average.
Is this move specific to BIIB or part of a bigger sector move?
Biogen is currently being framed alongside the broader Healthcare group on this page, which helps separate stock-specific moves from broader sector pressure.
What should investors watch next for BIIB?
Next reported earnings date: Jul 29, 2026. Previous close was $216.06, which is the cleanest baseline for judging whether today's move is extending or reversing momentum. Mean analyst target is $220.28; large gaps between current price and the target can keep sentiment-sensitive names volatile. One-month return sits at +11.07%, which gives context on whether today's move is part of a larger trend.
When is BIIB earnings?
The next reported earnings date shown on this page is Jul 29, 2026.
WhyStockMove provides informational context and is not investment advice.