Biogen Inc. Common Stock (BIIB) options flow
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Options flow session · Last trade
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BIIB session snapshot
Bullflow recorded 2 BIIB options trades on Monday, October 26, 2026, totaling $898,600 in premium. Calls made up $0.00 (0.0%) across 0 trades and puts $898.60K (100.0%) across 2 trades.
1 trades were sweeps and 1 were blocks. 1 filled at or above the ask, 1 at or below the bid and 0 at the mid. The largest was a $865,000 block of 250 Jun 17, 2027 $260 Put trade at 11:37:15 ET, filled at the ask.
BIIB closed at $252.26, up 0.63% from the prior close. By premium, BIIB ranked 4 of 4 among the related tickers below.
- Company
- Biogen Inc. Common Stock
- Exchange
- NASDAQ
- Sector
- Healthcare
- Close
- $252.26
BIIB options flow statistics
- Total premium
- $898.60K
- Recorded trades
- 2
- Call premium
- $0.00
- Put premium
- $898.60K
- Put/call premium ratio
- Unavailable (no call premium)
- Avg premium per trade
- $449.30K
- Calls / puts (trades)
- 0 / 2
- Sweeps / blocks
- 1 / 1
- At or above ask
- 1
- At or below bid
- 1
- Largest trade
- $865.00K
- Last trade
Where the premium went
in calls
$898.60K · 2 trades
Premium
Trade type
Fill side
BIIB largest options trades
| Time | Contract | C/P | Premium | Size | Fill | Type |
|---|---|---|---|---|---|---|
| BIIB Jun 17, 2027 $260 | Put | $865,000 | 250 | Ask | Block | |
| BIIB Dec 18, 2026 $210 | Put | $33,600 | 96 | Bid | Sweep |
Each of the 2 largest trades had a different contract.
The 2 largest trades total $898.60K of $898.60K
BIIB gamma exposure
Gamma exposure is separate from this closing options flow summary. Additional data appears in the interactive view when available.
BIIB options flow questions
What was the largest BIIB options trade on October 26, 2026?
A $865,000 block of 250 BIIB Jun 17, 2027 $260 Put trade at 11:37:15 ET, filled at the ask. It was the largest of 2 trades Bullflow recorded for BIIB that session.
How much BIIB options premium traded on October 26, 2026?
$898,600 across 2 recorded sweeps and blocks: $0 in calls (0 trades) and $898,600 in puts (2 trades).
Was BIIB options flow bullish or bearish on October 26, 2026?
Calls were 0.0% of premium. 1 of 2 trades filled at or below the bid and 1 at or above the ask. Premium and fill side do not show whether a trade opened or closed a position or was a hedge, so they do not establish direction on their own.
How does BIIB options flow compare with related stocks?
BIIB ranked 4 of 4 by premium on Oct 26, 2026 among the tickers shown here. MRNA $36.86M, JNJ $2.40M, UNH $1.88M led; BIIB recorded $898.60K.
How often is BIIB options flow data updated?
The page shows a completed session (October 26, 2026, last trade 14:11:43 ET) and updates after the next trading day becomes historical. Intraday BIIB flow is in the Bullflow dashboard and API.
How to read this data
This summary covers recorded single-leg sweeps and blocks with positive premium, excluding cancelled trades. It describes the covered flow, not all options-market volume. Total premium is gross traded premium; it is not net buying pressure. The interactive dashboard can use different filters and may show different totals.
Calls, puts, and execution near the bid or ask provide context but do not establish whether a position was opened or closed, whether it was part of a hedge, or where the stock will move next. The session updates after the next trading day becomes historical.
Stock prices show regular-session candles delayed at least 15 minutes. The latest view refreshes during market hours; the flow-session view places recorded trades on their original date, using interpolated stock prices between candle samples. Gamma exposure shows its separately dated public closing snapshot.