Options/BIIB

BIIBBiogen Inc. Common Stock

Options Analysis Report•BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)

Market Cap $31.8B|NASDAQ

● 2026-09-11$215.43

BULLISH

Analysis: 2026-09-10 EOD data

1Y +44.7%YTD +21.2%7D -2.4%

Options Vol

2,539

30D

Implied Move

±9.5%

IV Rank

18%

BIIB Options Overview

Mixed signals. No clear edge detected.

REWARDS

RISK ANALYSIS

Snowflake Analysis

Balanced conditions with no clear edge

Learn

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BIIB Gamma Walls

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Value

Is IV priced right?

5.5

ExpensiveCheap

Measures whether options are cheap, fair, or rich relative to historical and peer

levels.

Risk Checks5/9 checks passed

IV Rank

≤35%

IV Rank 67.0% — elevated vs history

IV/HV Ratio

<1.05x

IV/HV 1.26x — IV premium over HV

Sector Relative≤50%

Sector percentile 74% — above sector median

Term Structure

<1.1x

Front/Back 0.85x — contango

Skew Normal

<1.25x

Put/Call IV 1.16x — elevated

Absolute IV

<80%

ATM IV 38.3% — normal range

Spread-Adjusted Value

<80%

Effective IV 59.3% (ATM 38.3% + spread 10.5% + bias) — good value

Execution Efficiency

<3.0%

Total drag 15.84% (spread 10.52% + slippage 5.32%) — high friction

Vega Efficiency

≥5.0

Vega efficiency 15.94 (vega 16.766 / spread 10.52%) — efficient

Sentiment

Bullish or bearish?

7.1

BearishBullish

Analyzes

put/call ratios

open interest skew

, and flow direction to determine market bias.

Risk ChecksBullish - Strong signal (Conviction: +30%, Raw: +29%)

Flow Direction

|net sentiment| ≥25%

Conviction-weighted: +30% (bullish) — Raw: +29%

OI Skew Magnitude

≥15%

|OI skew| 5.0% — balanced

Volume-OI Alignment

Same sign, |vol skew| ≥10%

Vol skew +24.9%, OI skew +5.0% — aligned

Conviction Quality

≥2/3 conditions

0-DTE 4%, far-OTM 15%, avg DTE 30

OI Momentum

|change| ≥3%

OI change +0.0% (5d) — stable

Smart Money Flow

|weighted flow| ≥20%

ITM: +80%, ATM: +32%, OTM: +28% — strong bullish (ITM/ATM aligned)

Sector Relative≤40% or ≥60%

Sector P/C percentile 36% — bullish vs sector

Activity

Unusual activity?

5.1

QuietActive

Detects volume surges,

block trades

, and unusual options activity that may signal moves.

Risk Checks2/8 checks passed

Volume Surge

≥1.5x

Volume 2.4x avg — hot

Turnover Rate

≥15%

Vol/OI 5.5% — normal turnover

Multi-Day Persistence

≥2 days

1 day(s) elevated — may be one-day event

OI Build

≥5%

OI change +1.2% (5d) — stable

Sector Relative≥60%

Sector activity percentile 75% — active vs sector

Trade Quality

≥30%

Large trade volume 0% — mostly retail

Execution Urgency

≥60%

Aggressive execution 23% — patient

Flow Conviction

≥30

Conviction +30 (bullish) — mixed

Liquidity

Can I trade efficiently?

3.5

IlliquidLiquid

Evaluates

bid-ask spreads

, volume depth, and open interest for trade execution quality.

Risk Checks2/8 checks passed

Tradeable Spread

≤5.0%

Spread 10.5% — wide

Adequate OI

≥10,000

OI 45,921 — adequate

Active Volume

≥500

Volume 2,539/day — adequate

Reasonable Cost

≤$0.50

$0.53 to cross — expensive

Strike Coverage

≥5 strikes

0 liquid strikes — limited options

Sector Relative≤40%

Sector spread percentile 76% — wider than sector

Order Book Depth

≥100 contracts

Depth 36.2 contracts (bid:15.6 ask:20.6) — thin

Execution Quality

<1.0%

Avg slippage 5.32% — poor

Timing

Is now a good time?

6.7

RiskyFavorable

Considers earnings proximity,

time decay

, and event calendar for optimal entry timing.

Risk Checks5/9 checks passed

Term Structure Clarity

|slope| ≥5%

Slope -15.3% — contango

IV Percentile Clarity

<30 or >70

IV percentile 67% — neutral

Event Detection

≥10pts kink

IV kink -2.6pts — no clear event

Theta/Vega Clarity

<0.5 or >2.0

θ/ν ratio 77.80 — favors income trades

Expiration Distribution

≥3 expirations

4 liquid expirations — flexible

Event Risk

≥60% (safe)

caution advised: FOMC in 5d; CPI in 0d (HIGH)

Spread Momentum

<1.2 ratio

Spread ratio 1.00x — stable

Flow Momentum

≥25% strength + ≥50% consistency

Flow +30% @ 65% consistency — moderate (bullish)

Smart Money Timing

≥40 composite score

Score 30 (ITM 20% + inst 0%) — retail dominated

Directional Strategy Fit

Option Buyers

Long Calls6.7

bullishIV fair, bullish flow

Long Puts4.5

bearishIV fair, bullish flow

Premium Sellers

Cash-Secured Put5.5

bullishIV fair, bullish flow

Covered Call4.1

bearishIV fair, bullish flow

For educational purposes only. Not investment advice.

The Options Desk tracks the move options price into every US earnings report the week of Sep 7, next to how much each stock has actually moved on its past prints — plus the SPY, QQQ and IWM expected ranges and the gamma walls that box them in.

More on BIIB

BIIB gamma walls BIIB option chain BIIB max pain BIIB expected move BIIB IV rank BIIB put/call ratio BIIB options flow