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$249.38
+0.18%Delayed · Pre-marketDelayed 15 minutes · Source: ViewTrade · 4 Nov 2026, 15:17 IST · A quote does not mean the product is available to trade on your account.
Opens 8:00 pm IST
Opens 8:00 pm IST
Opens 8:00 pm IST
In brief
Questions investors ask
Quotes run fifteen minutes behind.
1 month: +11.3% (SPY −2.6%, XLV +9.9%). 3 months: +19.4% (SPY −2.2%, XLV +13.5%). 1 year: +64.4% (SPY +10.4%, XLV +27.4%). Price change to the 3 Nov 2026 close; dividends excluded.
Daily closes, split-adjusted: BIIB, SPY and XLV · as of 3 Nov 2026
Closed at $248.93 on 3 Nov 2026: 3.8% below the 52-week high of $258.78 (28 Oct 2026) and 67.6% above the low of $148.51 (5 Nov 2025).
Daily price bars, split-adjusted · as of 3 Nov 2026
The 3 Nov 2026 close of $248.93 was 9.0% above its 50-day average ($228.34) and 23.2% above its 200-day average ($202.00). It has closed above the 200-day for 296 sessions, since 2 Sep 2025. The 50-day average crossed above the 200-day on 25 Sep 2025, 278 sessions ago.
Daily closes, split-adjusted; 50- and 200-session simple averages · as of 3 Nov 2026
5.5M shares were sold short at the 15 Oct 2026 settlement, 3.7% of the 147.8M shares outstanding; covering them would take 4.4 days of average volume. Short interest is reported twice a month, on a lag.
Exchange short-interest filing · as of 15 Oct 2026
Price return, split-adjusted
At the 3 Nov 2026 close
Biogen is an established biopharmaceutical company focused on treatments for neurodegenerative and rare diseases. Its declining multiple sclerosis franchise is its largest revenue generator and contributed 40% of total revenue in 2025. Biogen also generates significant revenue from its CD20 collaboration agreements with Roche (19% of total in 2025), which includes oncology drugs Rituxan and Gazyva and multiple sclerosis drug Ocrevus. Biogen's newer franchises include Spinraza (spinal muscular atrophy, with partner Ionis), Leqembi (Alzheimer's disease, collabroation revenue from its partner Eisai), Skyclarys (Friedreich's ataxia, Reata), Zurzuvae (postpartum depression, Sage), and Qalsody (amyotrophic lateral sclerosis, Ionis).
October 1, 2025
+10.09%September 28, 2022
+39.85%December 29, 2021
+9.46%