stockNASDAQ: BIIB • 28 Days Updates
Biogen Stock (BIIB)
Showing Closing Date Range from Sep 21 to Oct 19, 2026.
Biogen (BIIB) is a pioneering biotechnology company focused on discovering and developing treatments for neurological and neurodegenerative conditions, trading among Nasdaq Stocks. The stock last closed at $233.48, moving +1.77% over the past week and +6.58% across 28 days. Over longer horizons, shares moved +14.92% over 3 months, +22.84% over 6 months, and +59.23% over 12 months. Peer healthcare companies PFE (Pfizer) (+6.13%), MRNA (Moderna) (+31.20%), ZTS (Zoetis) (+11.58%), MRK (Merck) (-3.91%) and JNJ (Johnson & Johnson) (-5.82%) moved over the same 28-day period.
Investor Relations:biogen.com
Price & Performance Trajectory
Biogen Inc.NASDAQ: BIIB
Latest Close
$233.48
28 Days Updates Trajectory
Showing Closing Date Range from Sep 21 to Oct 19, 2026.Loading trajectory chart...
Click metric scorecards below to toggle price, return %, range & volume curvesBIIB session performance
✓ Latest Close USD
$233.48
Latest session close
+$14.41vs period start
Period Return % % GAIN
+6.58%
Net period trajectory
Cumulative ReturnNormalized
High / Low Range SPREAD
$240.99 / $214.59
Period range envelope
$26.40channel spread
Total Volume SHARES
24.82M
Period turnover
Avg: 1.24M/dLiquidity
Historical Session Ledger
Daily open, high, low, and close prices with volume and period returns.
Historical Quotes & Breakdown(20 dates)
| Date | Close (USD) | Return % | High | Low | Volume |
|---|---|---|---|---|---|
| Oct 19, 2026 | $233.48 | +0.36% | $236.00 | $231.04 | 949.4K |
| Oct 16, 2026 | $232.65 | -1.15% | $236.74 | $232.46 | 1.46M |
| Oct 15, 2026 | $235.35 | +1.08% | $240.99 | $235.22 | 1.57M |
| Oct 14, 2026 | $232.83 | +1.72% | $234.20 | $228.00 | 1.86M |
| Oct 13, 2026 | $228.90 | -0.22% | $231.04 | $226.71 | 1.05M |
| Oct 12, 2026 | $229.41 | +1.64% | $238.24 | $229.00 | 1.46M |
| Oct 09, 2026 | $225.71 | +3.33% | $227.20 | $219.23 | 815.0K |
| Oct 08, 2026 | $218.43 | -1.67% | $223.09 | $215.73 | 1.34M |
| Oct 07, 2026 | $222.15 | -0.33% | $228.00 | $221.40 | 1.30M |
| Oct 06, 2026 | $222.89 | -0.31% | $225.97 | $218.00 | 1.01M |
| Oct 05, 2026 | $223.59 | +1.69% | $223.85 | $218.22 | 936.9K |
| Oct 02, 2026 | $219.88 | -1.32% | $224.08 | $219.84 | 773.2K |
| Oct 01, 2026 | $222.82 | -1.35% | $228.31 | $222.50 | 1.76M |
| Sep 30, 2026 | $225.88 | -0.52% | $229.36 | $225.51 | 1.55M |
| Sep 29, 2026 | $227.07 | -0.71% | $229.41 | $224.45 | 1.16M |
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