SK Hynix (000660) has once again hit the daily limit down on alternative trading system Nextrade’s (NXT) pre-market session with only a minuscule number of shares traded, reigniting controversy over opening price formation.

According to the financial investment industry on August 6, SK Hynix was executed at 1.168 million won (approximately $824), a 29.97% plunge from the previous trading day’s closing price of 1.668 million won, with just 11 shares changing hands immediately after the pre-market opened at 8:00 a.m. A Volatility Interruption (VI) was subsequently triggered, switching trading to a 2-minute single-price call auction. After trading resumed, the decline quickly narrowed to the 3-4% range.

This incident marks the second occurrence of an ultra-low price execution, following the July 28 event. That earlier case, where a single share formed the limit down price, sent shockwaves beyond South Korea’s stock market into overseas cryptocurrency derivatives markets.

ItemJuly 28 CaseAugust 6 CaseExecution Volume1 share11 sharesExecution Price (vs. Prev. Close)1.272 million won (approximately $897) (-29.99%)1.168 million won (approximately $824) (-29.97%)VI TriggeredNo (before static VI implementation)Yes, 2-min single-price call auctionOverseas Derivatives ImpactTrade.xyz oracle reflected; approximately $57.1M liquidated on HyperliquidNo confirmed overseas derivatives chain reactionDamage Scale900+ users, approximately $17.6 million (~25 billion won) in losses—

According to a Shinhan Securities report, on July 28 at 8:00 a.m., a single share of SK Hynix was executed at the limit down price of 1.272 million won (approximately $897) on Nextrade’s pre-market. While the stock price immediately recovered to the 1.7 million won range, limiting the impact on the spot market, the problem escalated when this price was reflected in the oracle (which provides underlying asset prices) for SK Hynix perpetual futures on overseas crypto derivatives exchange Trade.xyz.

As the oracle price plunged 17.9%, approximately $57.1 million (~81 billion won) worth of positions were forcibly liquidated in an instant on Hyperliquid, the leading on-chain perpetual futures exchange by market share. According to Bloomberg, blockchain data platform Allium estimated that over 900 users suffered $17.6 million (~25 billion won) in actual losses from these liquidations.

Park Sung-je, an analyst at Shinhan Securities, explained the situation: “A single share traded abnormally in the low-liquidity pre- and after-market was reflected in Trade.xyz’s derivatives pricing, triggering massive liquidations.”

▲ The pathway through which a tiny trade in South Korea’s stock spot market cascaded into massive liquidations in overseas crypto derivatives markets. The thin order book of the pre-market was the starting point.

Trade.xyz announced on July 29 that it would fully compensate the liquidation losses, moving to contain the fallout, but made it clear that this compensation was a one-time measure. This has prompted calls within South Korea’s securities industry to prepare for the possibility that actors seeking to trigger perpetual futures liquidations could target pre-market opening prices.

The pre-market operates on a continuous matching basis, where trades are executed immediately when buy and sell orders match. Immediately after opening, liquidity is insufficient, creating a structure where even a single share can move prices dramatically. In fact, on the previous trading day, Samsung Electro-Mechanics and Alteogen both formed their opening prices at the daily limit up with just one share traded.

To reduce such anomalous executions, Nextrade plans to introduce a static Volatility Interruption (VI) mechanism on September 14. When an order is received at a price deviating 10% or more from the previous day’s closing price or reference price, it will not be executed immediately. Instead, trading will switch to a 2-minute single-price call auction, where orders are collected and an equilibrium price is calculated before trading resumes.

Note: According to an Edaily report (August 2, 2026), Jang Geun-hyuk, a research fellow at the Korea Capital Market Institute, pointed out: “Even if the static VI operates at the 10% level, it cannot prevent all price distortions within that range. While temporarily halting trading will have the effect of mitigating price volatility, it will be difficult to resolve the issue of thin order books in the pre-market.” (Source: Edaily)

SK Hynix’s latest limit down execution occurred just ahead of the static VI implementation, heightening market concerns. With the confirmation that pre-market price distortions can trigger chain-reaction shocks in overseas derivatives markets, attention is expected to focus on the effectiveness of the planned system improvements.