US Stock Market Goes 24/7: What It Means for Investors Worldwide

The financial world is abuzz with a revolutionary shift in trading operations. Starting February 2025, the United States will debut its first nearly 24-hour stock exchange, 24 Exchange (24X), approved by the U.S. Securities and Exchange Commission (SEC). Operating for 23 hours a day, five days a week, this initiative is set to redefine global trading norms and usher in a new era for investors, traders, and markets worldwide. Let’s dive into the details of this game-changing development and explore its implications.

The Traditional Stock Market: A Legacy Model

Stock markets have long operated within fixed trading windows. The New York Stock Exchange (NYSE) and NASDAQ, for instance, have trading hours from 9:30 a.m. to 4:00 p.m. EST. These hours are a relic of a bygone era when trading was conducted face-to-face in physical exchanges. Although technology has transformed the trading landscape—facilitating electronic transactions executed in milliseconds—the legacy model of restricted hours has persisted.

After-Hours Trading: A Partial Solution

Platforms like Robinhood and Interactive Brokers offer after-hours trading through Electronic Communication Networks (ECNs), enabling trading beyond official hours. However, ECNs come with limitations, such as reduced liquidity, higher volatility, and restricted securities. The introduction of a true 24-hour stock exchange aims to address these issues, bridging the gap between traditional equities and modern markets like cryptocurrencies and forex, which already operate round the clock.

Why 24-Hour Trading Matters

For Global Investors

For investors outside the U.S., time zone differences often mean trading U.S. equities requires staying up late or waking early. The new model eliminates this inconvenience, allowing international investors to trade during their local business hours. For instance:

• An investor in India can now trade U.S. stocks in real time without waiting for the market to open in New York.
• A trader in Europe can react instantly to U.S. market news during their daytime hours.

Real-Time Reaction to Events

Under current market norms, significant news—like a company’s quarterly earnings announcement after market hours—creates a lag in investor reactions. Traders must wait until the next day, often resulting in price gaps at market opening. A 24-hour exchange allows for real-time responses, potentially smoothing out these gaps and enhancing price discovery.

Key Benefits of a 24-Hour Stock Market

Increased Accessibility:

• Facilitates participation from global investors across diverse time zones.
• Reduces barriers for retail investors to align with institutional strategies.

Smoother Price Discovery:

• Continuous trading reduces the shock of overnight events, allowing prices to adjust organically.

Alignment with Modern Markets:

• The 24X model mirrors the 24/7 trading of cryptocurrencies and forex markets, catering to modern investors’ expectations for constant market access.

Diversified Liquidity Pools:

• Attracts participants from various geographies, potentially boosting market liquidity.

Potential Challenges

Liquidity Concerns

While extended hours promise greater participation, liquidity—the availability of buyers and sellers—may become uneven. For example:

• Peak Liquidity: Likely during U.S. daytime hours when institutional traders are active.
• Thin Liquidity: Certain hours, such as late at night in the U.S., may see lower trading volumes, leading to price volatility.

Volatility Risks

Low liquidity during quiet hours can lead to price swings, where a single large trade significantly impacts stock prices. This creates challenges for retail traders attempting to execute large orders without influencing prices.

Continuous Trading Pressure

Without traditional closing hours, traders may face decision fatigue and emotional trading, as there’s no natural pause to process market developments. This could amplify impulsive behaviors driven by fear or greed, exacerbating market volatility.

Infrastructure Demands

Running a near-24-hour exchange requires robust technological systems to prevent outages and ensure seamless operations. This increases the operational complexity and costs for exchanges.

Implications for Global Markets

The success of 24X could serve as a blueprint for other financial hubs. Exchanges in Europe, Asia, and India may feel competitive pressure to extend their trading hours. While moving to 24-hour trading might not happen overnight, incremental steps such as extending pre-market and post-market sessions could become more common.

India’s Perspective

India, one of the fastest-growing equity markets globally, could benefit from adopting similar models. Extended trading hours could:

• Facilitate foreign investment by aligning with international market hours.
• Boost liquidity in markets like the National Stock Exchange (NSE) and Bombay Stock Exchange (BSE).
• Encourage retail investor participation, allowing more flexible trading schedules.

Looking Ahead

The launch of 24X marks a pivotal moment for the financial ecosystem. For investors, this is a double-edged sword—a chance to access unprecedented trading flexibility coupled with new risks that demand vigilance. Traders and investors must adapt, adopting strategies that mitigate risks while capitalising on opportunities in this continuously evolving landscape.