SanDisk Corporation closed at USD 1,390.95, rising 2.67%. The session was highlighted by significant options activity, including a notable $3.48 million put purchase targeting a substantial decline over a longer horizon, signaling a distinct bearish tilt in large-trade sentiment.

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Options Indicators

SNDK’s implied volatility is currently 175.24%, and with an IV percentile of 100.00%, volatility is sitting at the very top of its recent range, indicating that options are priced expensively. The IV/HV ratio of 1.15 further suggests implied volatility is running above historical realized volatility, reinforcing the view that the options market is embedding a rich premium for near-term uncertainty.

The Call/Put volume ratio is 0.66.

Large Trades

A PUT buy worth $3.48 million was the standout large trade, with 1,548 contracts of the August 21, 2026 $700.00 put purchased. With the stock reference price at $1,390.95, this strike sits far out of the money, making it a bearish downside position that likely targets a substantial decline over a longer time horizon rather than near-term protection. As a single-leg put purchase, the trade reflects straightforward premium outlay for downside exposure, indicating the buyer is positioning for weakness or seeking tail-risk hedging against a major drop in SNDK.

Overall large-trade sentiment was clearly bearish, with total bullish flow at $0.00 million versus total bearish flow at $4.41 million, leaving a net difference of $4.41 million to the bearish side. The directional judgment is decisively negative, as all tracked large-trade activity was concentrated in put buying and there was no meaningful bullish premium committed. The character of the flow suggests investors were willing to pay for downside exposure rather than income generation, pointing to cautious expectations and a market tone skewed toward protection or speculation on further downside in SNDK.

Strategy Reference

Given the elevated volatility and bearish flow, an options seller looking for low assignment probability might consider writing puts at a strike like $1,000.00, which remains deeply out-of-the-money relative to the current price, while a trader preferring defined risk could implement a bear put spread, such as buying the $1,300.00 put and selling the $1,200.00 put, to express a bearish view without posting the full margin of a naked short put.