Securities Trading Hours The Beginning of Innovation: Nasdaq's 5×23 Hour System and the Future of 24/7 Finance

On December 15, 2025, when Nasdaq submitted its reform application to the U.S. Securities and Exchange Commission (SEC), the global financial markets reached a turning point. This seemingly simple proposal to extend securities trading hours—from 16 hours daily, 5 days a week, to 23 hours daily, 5 days a week—signaled a systemic preparation within the traditional financial system aimed at迎接 an era of “never closing” tokenized assets.

Once upon a time, trading US stocks meant staying up late. As the cryptocurrency market had long since adapted to a 24/7, non-stop rhythm, Nasdaq, standing at the core of TradFi (Traditional Finance), finally began actively rewriting the rules of the game.

Not Just Extending Trading Hours: Understanding the True Needs Behind the Securities Trading Time Reform

On the surface, Nasdaq’s extension of securities trading hours is to “meet the growing demand from Asian and European investors, allowing them to trade outside traditional hours.” But in reality, this decision reflects a deeper market change—the explosive growth in cross-timezone trading demand.

According to the latest data from the New York Stock Exchange (NYSE), in Q2 2025, trading volume during non-traditional hours (pre-market and after-hours) exceeded 2 billion shares, with a trading value of $62 billion, accounting for 11.5% of total U.S. stock trading that quarter, setting a record high. What does this mean? Night trading, once considered a fringe market, has become a new battleground that mainstream capital cannot ignore.

Night trading on platforms outside the main exchanges, such as Blue Ocean and OTC Moon, is growing exponentially. Nasdaq’s true intention is not merely to create this demand but to “reclaim” the transactions that previously occurred in low transparency, regulatory blind spots—by expanding securities trading hours, bringing the lost orders back into a centralized, regulated trading system.

This is particularly significant for investors in the East 8 time zone. In the future, they will no longer need to stay up late or wake up in the middle of the night to participate in U.S. stock trading during working hours. But behind this lies a profound issue concerning financial infrastructure.

The Awkward 1 Hour: The Physical Limits of the TradFi System

If Nasdaq is determined to reform, why not simply implement 24/7 trading instead of leaving an awkward 1-hour window (from 20:00 to 21:00 daily) for market close?

The answer lies in the technical system of TradFi itself.

U.S. stock trading is not a one-exchange show but a complex ecosystem. Nasdaq, brokerages, clearinghouses (like DTCC), regulators, and listed companies are all indispensable parts of this gear. To support 23-hour trading, all participants need to undergo deep system upgrades:

Brokerages and dealers must extend customer service, risk control, and trading maintenance systems to operate around the clock, significantly increasing labor and system maintenance costs.

The clearinghouse DTCC must upgrade its clearing and settlement systems to extend service hours until 4 a.m., accommodating the new “night trading with next-day settlement” rules. Simply put, the clearinghouse functions like a bank branch, requiring daily reconciliation. Under the current centralized system, there is a need for a physical downtime to process batch data and margin settlements.

Public companies must also adjust their reporting schedules and major disclosures, as investor relations management needs to adapt to the new reality where “significant information is priced instantly outside traditional hours.”

In other words, this 1-hour window is the “Achilles’ heel” of TradFi—the buffer period that must be retained under the current centralized clearing and settlement system. It reflects the fundamental limitations of traditional financial architecture: it requires downtime to ensure system security.

Liquidity Fragmentation and Black Swan Risks: The Double-Edged Sword of 23-Hour Trading

What market impacts could result from extending securities trading hours to 23 hours?

On the surface, it presents opportunities—more cross-timezone investors can participate in U.S. stock trading during their local hours, which is a tangible benefit. But from a market microstructure perspective, it introduces new uncertainties in liquidity distribution, risk transmission, and price discovery.

First, the risk of liquidity fragmentation.

While extending trading hours theoretically attracts more cross-timezone capital, in practice, it fragments and dilutes limited trading demand over a longer period. Especially during “night” trading hours, the original U.S. stock trading volume is already lower than during regular hours. Extending hours may lead to wider spreads, reduced liquidity, increased trading costs, and volatility, with a higher risk of price manipulation or abrupt price swings in thin liquidity periods.

Second, the change in price discovery and power structure.

Can Nasdaq truly “capture” OTC platform orders through extended trading hours? Not entirely. The liquidity fragmentation faced by institutional investors does not disappear; it merely shifts from “off-exchange dispersion” to “on-exchange time slices,” raising the cost of risk control and trade execution.

Finally, the amplification of Black Swan risks.

Within a 23-hour trading framework, major sudden events—such as earnings shocks, regulatory statements, or geopolitical conflicts—can be instantly translated into trading orders. The market no longer has the psychological buffer of “sleeping on it overnight.” In the relatively illiquid night environment, such immediate reactions are more likely to trigger chain reactions, leading to gaps and sharp volatility.

Therefore, extending securities trading hours is not just about “opening a few more hours,” but a systemic stress test on TradFi’s price discovery mechanisms, liquidity structure, and distribution of pricing power.

Strategic Coordination of Three Parties: Regulators, Infrastructure, and Exchanges Moving in Sync

Looking further ahead, connecting Nasdaq’s recent intensive actions reveals that this is not an isolated reform but a highly coordinated systemic project.

Clear timeline:

In May 2024, U.S. stock settlement system was shortened from T+2 (settlement two trading days after trade) to T+1, a seemingly conservative but crucial infrastructure upgrade.

In early 2025, Nasdaq began signaling “around-the-clock trading” plans, announcing a schedule to launch continuous trading for five days a week in the second half of 2026.

Simultaneously, Nasdaq upgraded its Calypso system, integrating blockchain technology to enable 24/7 automated margin and collateral management. This reform has little immediate impact on retail investors but sends a clear signal to institutional investors: backend systems are preparing for “on-chain” operations.

In the second half of 2025, Nasdaq actively pushes for institutional reforms. In September, it formally submitted a tokenization trading application for stocks to the SEC; in November, it publicly announced tokenization of U.S. stocks as a top priority, aiming to “advance as quickly as possible.”

Almost simultaneously, SEC Chairman Paul Atkins stated in an interview with Fox Business that tokenization is the future direction of capital markets. He predicted that “within about two years, all U.S. markets will migrate to on-chain operations with on-chain settlement.”

Against this backdrop, Nasdaq submitted its application for a 5×23-hour trading system in December 2025.

Even more noteworthy is the rhythm of the three parties’ coordination:

The SEC continues to loosen regulations, while high-level interviews keep releasing expectations of “full on-chain,” injecting certainty into the market.

DTC, a subsidiary of DTCC, received SEC no-objection approval on December 12, allowing it to provide real-world asset tokenization services in a controlled environment, with plans to launch officially in the second half of 2026. This addresses the core issues of clearing and custody compliance.

Nasdaq’s announcement of stock tokenization plans, prioritizing, and simultaneously submitting the 23-hour trading application, prepares to attract global liquidity.

When these three lines are aligned on the same timeline, the level of tacit coordination proves that this is not coincidence but a highly synchronized, continuous systemic project. Nasdaq and the U.S. financial markets are racing toward a “non-closing” financial system.

From 23 Hours to 7×24: The Inevitable Evolution of the Tokenization Era

Why is the extension of securities trading hours so closely related to tokenized assets?

Because tokenized assets are inherently 24/7 liquid. Once stocks are tokenized, they can be settled atomically on the blockchain like crypto assets, without the need for centralized clearinghouses or that critical 1-hour downtime.

Blockchain-based tokenized assets rely on distributed ledgers and smart contracts to achieve atomic settlement, carrying the genetic code of 24/7×365 trading—no closing, no need for market halts, and no need to squeeze key processes into a fixed end-of-day window.

So why does Nasdaq go through the trouble of extending securities trading hours to 23 hours instead of directly achieving 7×24? The answer is simple: under current securities laws and the National Market System (NMS) framework, a gradual transition path is necessary.

The 23-hour system is essentially a “transitional state.” It gradually pushes trading systems, infrastructure, and participant behaviors toward a “near on-chain” rhythm without overturning existing legal frameworks, paving the way for more aggressive future goals (more continuous trading, shorter settlement cycles, on-chain clearing, and tokenized delivery).

Imagine that once SEC approval is granted, and the 23-hour trading system begins operation and becomes routine, the entire market’s reliance on “anytime trading, real-time pricing” will be greatly increased. Will the ultimate goal of 7×24 still be far away?

When tokenized U.S. stocks are truly implemented, the global financial system will smoothly transition into that “never closing” future. And by then, the concept of securities trading hours itself may be fundamentally redefined.

The Race Among Global Exchanges

Nasdaq is not acting alone. Coinbase, Ondo, Robinhood, MSX, and other players are also racing, preparing for the future of tokenized assets.

Who can adapt first to the “never closing” trading ecosystem will gain an advantage in the next wave of financial restructuring. This is not just a technological upgrade but a battle for market dominance.

Once investors are accustomed to trading at any time, they will no longer accept the old era of “closing hours.” Every extension of securities trading hours further consolidates market expectations for 24/7 trading, and ultimately, only fully decentralized, native tokenized assets can fully meet this demand.

The future may still be distant, but the time left for the “old clock” is running out. The “non-closing financial system” jointly built by Nasdaq, regulators, and infrastructure providers is approaching reality at an unstoppable pace.