SanDisk Corp. closed at USD 1,237.92, up 2.12%.

A massive bearish block trade dominated the options flow in SanDisk, as a single $15.55 million out-of-the-money call sale at the $1,300 strike stole the spotlight. With no offsetting bullish large trades on the tape, the session’s institutional activity points squarely toward a view that the stock’s upside will be limited through mid-2026.

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Options Indicators

SNDK’s implied volatility stands at 93.74%, but with an IV percentile of 22.71% and an IV/HV ratio of 0.61, current option pricing sits on the low side relative to its own recent history and is relatively inexpensive rather than stretched. In other words, while the absolute IV level looks high at first glance, the percentile context suggests volatility is not elevated for this name right now, and the sub-1.0 IV/HV ratio indicates implied volatility is running below historical realized volatility, reinforcing the view that options are comparatively cheap. The Call/Put volume ratio is 1.33.

Large Trades

A CALL sale worth $15.55 million was the standout large trade, with 1,767 contracts sold at the 1300.0 strike expiring on 2026-08-28. With the reference stock price at 1237.92, this call was out of the money at execution, making it a bearish-positioned trade under the provided classification. Selling an out-of-the-money call at this strike typically reflects a view that upside will remain capped below 1300.0 into expiration, while also allowing the seller to collect premium income. Strategically, this points to either premium collection against a neutral-to-bearish outlook or a position expressing limited upside expectations. Overall sentiment was clearly bearish. Total bullish large-trade flow was $0.00 million, while total bearish flow reached $15.55 million, leaving a net difference of $15.55 million to the bearish side. With all identified large-trade activity concentrated in a single sizable out-of-the-money call sale and no offsetting bullish block flow, the options tape suggests institutional positioning is skewed toward restrained upside expectations rather than anticipation of a strong rally.

Strategy Reference

For traders looking to collect premium with a similar bearish-to-neutral view, selling the $1,400 call on a further rally could offer additional premium with a lower probability of assignment, while a bear call spread using the $1,300/$1,400 strikes limits margin requirements and defines risk.