BIIB options flow: unusual options activity in Biogen Inc.

Updated 28 September 2026, 09:54 ET

Over the last week the tape recorded 54 unusual options prints in Biogen Inc. (BIIB), $2.7M of tracked premium, leaning firmly bullish. Bullish premium was $1.9M against $723K bearish; $2.7M went into calls and $57K into puts, a put call ratio of 0.02. The largest print was $457K of BIIB 18 Dec 2026 $210 calls on 21 September 2026, swept at bid. The last session with prints, 24 September 2026, added 23 prints and $774K of premium. BIIB closed at $227.60 on 25 September 2026, up 0.5%.

This week's unusual flow

Prints from 21 September 2026 to 24 September 2026, 4 sessions. Delayed tier: every print is shown twenty minutes after it executed, and the page is rebuilt after each session.

Net premium is bullish minus bearish premium. The put call ratio is put premium divided by call premium, weighted by money rather than by contract count. Sweeps is the share of prints executed across several exchanges at once. Read the guide: Reading the Pulse.

Largest prints of the week

Size above open interest means the trade opened a position larger than everything that existed in the contract the night before. Above ask and below bid are the most aggressive executions. Read the guide: Size versus open interest.

Where the money is aimed

The most premium, $1.4M, is aimed at the 18 Dec 2026 expiry; the nearest expiry with unusual prints is 16 Oct 2026.

A print in a contract expiring this week is a view about the next few days, often about a known event; a print months out is a different kind of statement. Read the guide: 0DTE options flow.

The last session, 24 September 2026

Every print in BIIB with its full detail, the live tape, one tap filters and saved screeners: open BIIB in Options Sentiment Screener.

Price

The live quote and the price chart sit beside the ticker's flow in the app: open BIIB in Options Sentiment Screener.

Analysts

The most recent analyst targets on file, from 19 firms, have a median of $241, 5.9% above the last close. The last 90 days brought 2 upgrades.

Calls bought at a strike above the average target are a bet that the analysts are too cautious; puts far below the price in a name they like are protection or a strong disagreement. Read the guide: Reading one ticker's flow.

About Biogen Inc.

Exchange

Nasdaq

Sector

Health Care

Industry

Pharmaceutical Products

Headquarters

Weston, Massachusetts

Website

biogen.com

Biogen Inc. discovers, develops, manufactures, and delivers therapies for treating neurological and neurodegenerative diseases. The company offers TECFIDERA, VUMERITY, AVONEX, PLEGRIDY, TYSABRI, and FAMPYRA for multiple sclerosis. It also offers RITUXAN for treating non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL), rheumatoid arthritis, and pemphigus vulgaris.

In the same sector

Flow pages for other Health Care names in the S&P 500:

LLY Eli Lilly & Co.JNJ Johnson & JohnsonABBV AbbVie Inc.MRK Merck & Co. Inc.UNH UnitedHealth Group Inc.TMO Thermo Fisher Scientific Inc.AMGN Amgen Inc.GILD Gilead Sciences, Inc.

Learn

• What unusual options activity means
• Reading one ticker's flow
• Sweeps, blocks and where a trade printed
• Size versus open interest
• Bullish or bearish, how a print's sentiment is inferred
• The conviction score and whale prints