SK hynix closed at USD 193.50, up 5.08%.

Despite the rally, large options activity showed a distinctly bearish tone. A single synthetic put structure worth $1.56 million dominated the block flow, with no sizable bullish trades to offset it. The positioning indicates an institutional trader is using relatively cheap long-dated options to bet on downside into October 2026, even as the stock moves higher.

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Options Indicators

SK hynix currently has an implied volatility of 59.37%, while its IV percentile is just 1.75%, which indicates that volatility is on the low side and options are cheaply priced relative to their own historical range. With an IV/HV ratio of 0.93, implied volatility is also running slightly below realized volatility, reinforcing the view that current option premiums are relatively inexpensive rather than stretched.

The Call/Put volume ratio is 1.85.

Large Trades

A synthetic put position with a net debit of $1.56 million was the standout large trade, built by buying the 190.0 put and selling the 190.0 call in the 2026-10-16 expiration for 3,500 contracts each. With SKHY referenced at 193.5, the long 190.0 put was out of the money, while the short 190.0 call was in the money, creating a bearish synthetic structure that benefits from downside in the underlying. The trade’s net debit indicates the investor was willing to pay upfront to establish short-equity-like exposure, pointing to a deliberate directional bearish stance rather than a premium-collection strategy.

Overall, the large-trade flow in SKHY was clearly bearish. The only displayed block was a sizable synthetic put, which is a strong directional expression of downside expectations and suggests the trader was positioning for weakness over a longer-dated horizon into October 2026. With no offsetting bullish large trades in the flow, the block activity indicates a decisively negative institutional tone toward the stock.

Strategy Reference

For traders who agree with the bearish outlook but prefer lower margin exposure, a bear put spread using the 190.0/170.0 strikes in the same October 2026 expiration could cap risk while maintaining downside participation; alternatively, sellers comfortable with the low IV percentile might target a short call near the 220.0 strike for a lower assignment probability.