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TradeXYZ listed perpetual futures for Samsung Electronics, SK Hynix, Hyundai, and EWY on Hyperliquid in February, making it possible to trade exposure to Korean equities over the weekend for the first time.
I reviewed every weekend since listing, covering 62 observations across the four assets, and compared each contract’s move from Friday’s close to Sunday’s close with the direction of the underlying asset at Monday’s opening auction. For the Korean stocks, I used the KRX open at 9:00 KST. For EWY, I used the NYSE open at 9:30 ET.
Hyperliquid correctly predicted the opening direction in 45 of 62 cases, or 73.8%. That sounds promising, but the aggregate figure hides a highly uneven result across assets.
Samsung is the clear outlier. Hyperliquid called the direction correctly in 15 of 16 weekends. Samsung’s Monday opens were evenly split between up and down, so there was no underlying directional bias inflating the hit rate. A binomial test against a 50% baseline gives a p-value of 0.0003, implying only a 0.03% probability of observing a result this strong by chance. The sample is still small, but 15 correct calls out of 16 is difficult to dismiss.
Hyundai also performed well, with 13 correct calls out of 16, or 81%. However, the result does not clear the threshold for statistical significance after accounting for the stock’s slight downward bias on Mondays. During the sample period, Hyundai opened lower 62% of the time, meaning a strategy that simply predicted “down” already had a relatively high base rate.
SK Hynix was less convincing. Hyperliquid got 10 of 16 weekends right, only marginally better than a coin flip. Some of the misses were also severe. On one weekend (Jun 5~7), the Hyperliquid contract closed up 0.11%, only for SK Hynix to gap down 10.34% at the next KRX open.
EWY was the weakest result. Hyperliquid got only 7 of 13 weekends right, underperforming a naive baseline. EWY opened higher on 10 of those 13 Mondays, or 77% of the time. Simply predicting “up” every week would therefore have outperformed the Hyperliquid signal. Instead, the weekend contract closed lower in 9 of 13 cases, repeatedly pointing traders in the wrong direction.
The difference between Samsung and EWY is probably explained largely by market timing. KRX opens at 9:00 KST, or 00:00 UTC, almost exactly when Hyperliquid’s daily candle resets. The gap between the final weekend trades on Hyperliquid and the KRX opening auction is therefore measured in minutes.
EWY does not begin trading on the NYSE until 9:30 ET, roughly 14 hours after Hyperliquid’s Sunday candle closes. By that point, KRX has completed its entire Monday session, European markets have opened, and US pre-market trading has already incorporated another wave of information. The information set determining EWY’s Monday open simply does not exist when the Hyperliquid weekend candle closes.
A reasonable objection is that even Samsung’s result may reflect last-minute convergence rather than genuine price discovery. Informed traders could be positioning on Hyperliquid immediately before KRX opens, making the apparent prediction nearly tautological.
To test this, I repeated the analysis using Saturday’s close rather than Sunday’s close, creating roughly 24 hours of lead time instead of only a few minutes. The Saturday signal still predicted Samsung’s Monday opening direction with 75% accuracy against a 50% baseline. Sunday trading improves the result, but it does not create the signal from scratch.
Samsung’s own Friday price action, by comparison, predicted Monday’s direction only 62% of the time. This suggests that Hyperliquid’s weekend market is contributing information beyond simple continuation of the previous KRX session.
Of the four assets tested, only Samsung Electronics produced a statistically significant directional signal. The sample remains small, and the result has not yet been validated out of sample. Still, it may be useful to anyone trading Samsung or the broader KOSPI market.
Despite averaging only around $12,000 in weekend volume, Hyperliquid predicted the direction of a roughly $300 billion company’s Monday open with 94% accuracy and a p-value below 0.001. For anyone trading Samsung on the KRX, checking Hyperliquid’s weekend close before Monday’s opening auction appears well worth the effort.
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