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Dealer positioning

BSX Gamma Exposure (GEX)

Oct 29, 2026 · 3-session delay

−$13.3MNet gamma
$50Call wall
$40Put wall
$42.54Spot at close

Boston Scientific (BSX) closed that session in a negative gamma regime with net exposure of −$13.3M: dealers hedge by selling into weakness and buying strength, which amplifies moves in both directions. The dominant call wall sits at $50, while the put wall at $40 marks the heaviest downside hedging concentration.

Gamma by strike and expiration

How to read this: each column is an expiration, each row a strike. Gold cells mark the largest positive-gamma concentration per expiration (price magnets), purple the most negative (acceleration zones). Walls are where hedging flows are heaviest. Learn how GEX works →

What these terms mean: Gamma exposure·Call wall·Put wall

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More BSX data

Off-exchangeBSX Dark PoolPrints, levels, and off-exchange totalsOrder flowBSX Options FlowPremium totals, sweeps, and top strikesOverviewBSX Symbol OverviewEverything Robinflow tracks on BSX

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