The US stock market is open (09:30–16:00 ET). SKHX perpetual futures also trade outside those hours — nights, weekends and market holidays included.
Snapshot as of 15:03 UTC. The chart and price above update live. Machine-readable version.
SK Hynix — #1 in HBM. Perplo lists it as a perpetual future: you trade the price of SK Hynix, not the share itself.
There is no expiry and no market-hours window — SKHX trades 24/7. You post USDC as collateral, take either side with leverage, and settle onchain on Hyperliquid. No brokerage account.