ISRG gamma levels.

Where ISRG tends to stick and where it slips: the call wall, put wall, gamma flip and Volt, 15-minute delayed and free.

• ISRG $429.05 · up 0.33% on the day · positive gamma overall (moves grind and levels hold)
• Levels: ★ Volt, the biggest level 420 (below price · 9.05 / 2.11% away); ↯ Surge, live flow 457.5 (above price · 28.45 / 6.63% away); ‖ call wall — sticky, but below price · not a ceiling from here 420 (below price · 9.05 / 2.11% away); ‖ put wall — floor, slippery 350 (below price · 79.05 / 18.42% away); ⚡ gamma flip 398.21 (below price · 30.84 / 7.19% away); ↘ Reversal 350 (below price · 79.05 / 18.42% away)
• Expected move today ±15.5 · pre-open reference
• Strikes nearest the money (high to low): 435 positive, 432.5 positive, 430 positive, 427.5 positive, 425 positive, 422.5 positive
• Since yesterday's close, positioning grew at 435, 440, 460 and faded at 420, 425.
• Event pricing: the options market prices an unusually large move into 2026-10-23 (±$44.24 by that date, about 1.8x this board's normal daily move). On single names this is usually an earnings report. Descriptive of the market's own pricing, never a forecast.
• ATM implied volatility 34.3%