Cerebras Systems closed at $127.21, down 10.52%.
The session featured a dominant $2.41 million in-the-money put buy, signaling firm bearish institutional sentiment, while a much smaller $330 thousand out-of-the-money put sale provided only modest bullish contrast. Net options block activity leaned decisively defensive as the stock extended its decline.
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Options Indicators
Cerebras Systems currently has an implied volatility of 92.24%, and with an IV percentile of 39.62%, its recent volatility backdrop sits in a neutral range rather than an extreme one. In other words, even though the absolute IV level is high, relative to its own historical range the options are not especially cheap or especially expensive. The IV/HV ratio of 1.29 further suggests implied volatility is running above realized volatility, indicating the options market is pricing in somewhat richer forward uncertainty than the stock has recently delivered.
The Call/Put volume ratio is 0.34.
Large Trades
A put purchase worth $2.41 million was the standout large trade, with 2,500 contracts bought at the 135.00 strike expiring on 2026-10-23. With the stock reference price at 127.21, this put is in the money, which makes it a higher-delta bearish position with more immediate downside sensitivity. Strategically, this kind of trade points to either a strong directional bet that Cerebras Systems could weaken further or a meaningful hedge against downside risk over a longer-dated horizon.
A put sale worth $330 thousand was the other notable block, with 5,500 contracts sold at the 90.00 strike expiring on 2026-11-20. That strike sits out of the money versus the 127.21 stock reference, so this trade reflects a moderately bullish stance, typically expressing willingness to own shares at a much lower effective level or simply seeking premium income if the stock remains well above 90.00. Overall, the large-trade picture leans clearly bearish, because the dominant flow was the much larger in-the-money put buying, while the smaller out-of-the-money put sale looks more like secondary premium collection than a conviction-driven upside call.
Strategy Reference
For sellers seeking a low assignment probability, the 90.00 put remains a reference point, but given the bearish block flow, a put credit spread such as selling the 110.00/105.00 put spread may offer a more controlled risk profile without posting undefined margin.
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