Options/BIIB

BIIBBiogen Inc. Common Stock

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

Market Cap $32.3B|NASDAQ

● 2026-08-31$218.50

NEUTRAL

Analysis: 2026-08-28 EOD data

1Y +56.5%YTD +22.9%7D +0.2%

Options Vol

929

30D

Implied Move

±8.9%

IV Rank

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?

6.5

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 59.1% — elevated vs history

IV/HV Ratio

<1.05x

IV/HV 1.19x — IV premium over HV

Sector Relative≤50%

Sector percentile 68% — above sector median

Term Structure

<1.1x

Front/Back 0.87x — contango

Skew Normal

<1.25x

Put/Call IV 1.16x — elevated

Absolute IV

<80%

ATM IV 32.0% — normal range

Spread-Adjusted Value

<80%

Effective IV 71.3% (ATM 32.0% + spread 19.6% + bias) — fair

Execution Efficiency

<3.0%

Total drag 30.17% (spread 19.65% + slippage 10.52%) — high friction

Vega Efficiency

≥5.0

Vega efficiency 5.62 (vega 11.044 / spread 19.65%) — acceptable

Sentiment

Bullish or bearish?

4.3

BearishBullish

Analyzes

put/call ratios

open interest skew

, and flow direction to determine market bias.

Risk ChecksVery Bearish - Strong signal (Conviction: -51%, Raw: -46%)

Flow Direction

|net sentiment| ≥25%

Conviction-weighted: -51% (strong bearish) — Raw: -46%

OI Skew Magnitude

≥15%

|OI skew| 7.9% — balanced

Volume-OI Alignment

Same sign, |vol skew| ≥10%

Vol skew +9.8%, OI skew +7.9% — weak (same direction)

Conviction Quality

≥2/3 conditions

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

OI Momentum

|change| ≥3%

OI change +0.0% (5d) — stable

Smart Money Flow

|weighted flow| ≥20%

ITM: -39%, ATM: -56%, OTM: -42% — strong bearish (ITM/ATM aligned)

Sector Relative≤40% or ≥60%

Sector P/C percentile 64% — bearish vs sector

Activity

Unusual activity?

2.9

QuietActive

Detects volume surges,

block trades

, and unusual options activity that may signal moves.

Risk Checks1/8 checks passed

Volume Surge

≥1.5x

Volume 0.7x avg — normal

Turnover Rate

≥15%

Vol/OI 2.1% — normal turnover

Multi-Day Persistence

≥2 days

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

OI Build

≥5%

OI change +2.6% (5d) — building

Sector Relative≥60%

Sector activity percentile 39% — below sector avg

Trade Quality

≥30%

Large trade volume 11% — mostly retail

Execution Urgency

≥60%

Aggressive execution 26% — patient

Flow Conviction

≥30

Conviction -51 (bearish) — strong conviction

Liquidity

Can I trade efficiently?

2.8

IlliquidLiquid

Evaluates

bid-ask spreads

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

Risk Checks2/8 checks passed

Tradeable Spread

≤5.0%

Spread 19.6% — wide

Adequate OI

≥10,000

OI 43,487 — adequate

Active Volume

≥500

Volume 929/day — adequate

Reasonable Cost

≤$0.50

$0.98 to cross — expensive

Strike Coverage

≥5 strikes

0 liquid strikes — limited options

Sector Relative≤40%

Sector spread percentile 69% — wider than sector

Order Book Depth

≥100 contracts

Depth 63.2 contracts (bid:31.6 ask:31.6) — thin

Execution Quality

<1.0%

Avg slippage 10.52% — poor

Timing

Is now a good time?

7.4

RiskyFavorable

Considers earnings proximity,

time decay

, and event calendar for optimal entry timing.

Risk Checks7/9 checks passed

Term Structure Clarity

|slope| ≥5%

Slope -13.0% — contango

IV Percentile Clarity

<30 or >70

IV percentile 59% — neutral

Event Detection

≥10pts kink

IV kink -1.3pts — no clear event

Theta/Vega Clarity

<0.5 or >2.0

θ/ν ratio 38.82 — favors income trades

Expiration Distribution

≥3 expirations

4 liquid expirations — flexible

Event Risk

≥60% (safe)

safe window: No events detected

Spread Momentum

<1.2 ratio

Spread ratio 1.00x — stable

Flow Momentum

≥25% strength + ≥50% consistency

Flow -51% @ 75% consistency — STRONG directional (bearish)

Smart Money Timing

≥40 composite score

Score 41 (ITM 20% + inst 11%) — moderate institutional

Directional Strategy Fit

Option Buyers

Long Calls5.3

bullishIV cheap, mixed flow

Long Puts5.8

bearishIV cheap, mixed flow

Premium Sellers

Cash-Secured Put4.2

bullishIV too cheap, mixed flow

Covered Call4.7

bearishIV too cheap, mixed flow

For educational purposes only. Not investment advice.

The Options Desk tracks the move options price into every US earnings report the week of Aug 31, 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.

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