Nasdaq Signals 23-Hour Trading: Neutral for Crypto, a Headwind for Korean Equities?

The U.S. Nasdaq has begun the SEC approval process to enable 23-hour trading, five days a week, as early as late next year. As trading effectively extends toward 24/5, investors are watching how this may influence the cryptocurrency market and Korea’s domestic stock market. Our analysis views this development as broadly neutral for crypto, while potentially creating a structural headwind for Korean equities.

What’s Confirmed: The Core of Extended Hours

To start with the facts, Nasdaq has submitted filings to the SEC seeking approval for 23-hour trading, five days a week. This would significantly lengthen available trading hours in traditional equities, partially overlapping with cryptocurrency’s 24/7 market structure. Up to now, volatility in U.S. equities has tended to cluster around the regular-session open and close as well as premarket and after-hours windows. If the trading day expands, volatility releases could become more time-dispersed. The final implementation timeline and operational details will depend on the SEC’s decision.

Our Perspective: Neutral for Crypto, a Headwind for the Korean Market

We see the impact on crypto as broadly neutral. The historical pattern of sharp crypto moves coinciding with the U.S. equity open could moderate, and liquidity can enter at more varied times. By contrast, the change could be unfavorable for Korea’s domestic stock market. With U.S. equities tradeable almost continuously during local waking hours, investor attention and capital could be diverted from the Korean market to the U.S. market.

There are also potential positives for institutional investors. As crypto and U.S. equities converge more in trading hours, it becomes easier to manage positions and risk concurrently, enabling more systematic hedging strategies. That said, in the short term, crypto could face pockets of pressure as some flow that previously moved into digital assets while U.S. equities were closed may rotate to the newly extended U.S. equity hours.

Market-Structure Lens: Liquidity, Volatility, and Capital Allocation

From a market-structure standpoint, longer trading hours can affect spreads and execution efficiency. If U.S. regular-session events are less concentrated in specific windows, large gap moves may diminish while the frequency of small micro-moves increases. Given crypto’s 24/7 profile, any overnight attention premium could fade, and turnover might slow during periods without major catalysts. Conversely, global institutions would find simultaneous risk management across equities and crypto more straightforward, enhancing the practicality of hedging and arbitrage strategies. These shifts can alter short-term dynamics, but medium- to long-term fundamentals still hinge on the liquidity backdrop, interest rates, and earnings outlooks.

Takeaways for Investors

Crypto investors should anticipate a potential shift in liquidity peak times around the rollout of extended U.S. equity hours. It is prudent to monitor differences in order-book depth and fill intensity between Bitcoin and altcoins, the speed of news absorption, and the interaction with the release schedule of U.S. macro data. Korean equity investors should watch intraday turnover and the potential dispersion of activity into international futures and U.S. equities, and prepare for changes in flow sensitivity among large-cap names. In parallel, keep track of the SEC decision and the actual go-live schedule, and gradually reassess stock–crypto allocation and available hedging tools within portfolios.

Conclusion: Focus on Structural Change over Near-Term Direction

Nasdaq’s move toward 23-hour trading is less about dictating immediate market direction and more about reshaping liquidity flows and risk-management practices. While the effect on crypto may be broadly neutral, it could pose a headwind for the Korean market in terms of investor attention and capital flows. Until approval and operational details are finalized, a conservative approach to risk—one that assumes more dispersed volatility and potential capital reallocation—appears warranted.