Biogen Inc., US09062X1037

Biogen stock adds 3.40 percent ahead of the open

Published on 09/24/2026 at 04:03 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

At the close on September 23, 2026, Biogen stock reached USD 227.53, while the Nasdaq Composite fell 1.13 percent to 26,936.04. US Treasury yields and oil prices rose during the session.

Fotorealistisches Biotech-Labor in Cambridge MA mit Forscherin am Mikroskop und Blick auf den Charles River
Biogen Inc. Neurowissenschaftslabor in Cambridge MA zeigt Forscherin bei Gehirngewebeanalyse unter Mikroskop ISIN US09062X1037, Illustration mit AI erstellt.

Biogen stock closed at USD 227.53 on the Nasdaq on September 23, 2026, up 3.40 percent. The gain contrasted with a 1.13 percent decline in the Nasdaq Composite, which ended at 26,936.04 on the same date.

September 23, 2026 in numbers

Biogen Inc. (ISIN US09062X1037, Nasdaq: BIIB) advanced during a session in which US stocks broadly declined. The Nasdaq Composite lost 308.24 points, or 1.13 percent, to close at 26,936.04, according to LSE market data.

The broader decline followed higher oil prices and rising Treasury yields. TheStreet reported that the Nasdaq and Russell 2000 fell more than 1 percent as oil prices and Treasury yields climbed.

September 24, 2026 ahead

The next US session begins with Biogen carrying the September 23 close of USD 227.53. The market backdrop includes the September 23 Nasdaq Composite close of 26,936.04 and its 1.13 percent decline, while the prior session also saw US exchange volume of 17.0 billion shares compared with a 20-session average of 16.5 billion shares, according to Star Advertiser.

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