24/7 Trading: The Flow Numbers Behind the After-Hours Manipulation

The core inefficiency of 24/7 trading is stark: massive after-hours volume exists, but liquidity is extremely thin, creating a clear manipulation risk. Data shows a significant portion of retail trading now happens outside core hours. For instance, roughly one-third of stock trading in December 2025 took place during the after-hours session on eToro, while between 25% and 40% of retail clients traded during pre- and post-market sessions at Capital.com. This volume expansion is real, but it's concentrated in a small subset of traders.

The liquidity gap is severe. Despite the volume, participation is sparse. Only 4% to 5% of retail clients ventured into overnight trading at Capital.com. This creates a dangerous imbalance where a few players can move prices with minimal real economic activity. The risk is not theoretical. The SEC recently charged three companies and nine individuals with fraud schemes to manipulate crypto markets, using bots to generate artificial volume and create a false appearance of liquidity. This is the playbook that thrives in thin, after-hours markets where genuine price discovery is absent.

The result is a market prone to volatility and potential manipulation. With so little real trading interest, the few orders that do hit the tape can cause exaggerated price swings. This environment is fertile ground for the same kind of deceptive practices the SEC just cracked down on, where algorithms generate fake volume to lure unsuspecting retail investors. The flow numbers confirm a structural flaw: the system is built for constant access, but not for constant, fair liquidity.

The 24/7 Infrastructure: Capturing the Fragmented Flow

The market is building the infrastructure to handle the after-hours flow, but it's a fragmented, multi-year build-out. The cornerstone is Nasdaq's proposal to trade 23 hours per day, five days per week, a move directly aimed at capturing rising investor interest in overnight trading. This isn't a new idea; the SEC has already granted preliminary approval for 23×5 trading, signaling regulatory alignment with the trend.

Supporting this extended trading requires a parallel upgrade to market data and price discovery. The Securities Information Processors (SIPs) have announced plans to extend their hours to support extended trading activity, with a proposed schedule from Sunday evening to Friday evening. This data backbone is critical for ensuring prices are visible and consistent across the fragmented after-hours landscape.

The final piece is clearing, which must catch up to trading. The Depository Trust and Clearing Corporation (DTCC) has committed to support extended clearing hours of equities trades by mid-2026. This timeline is key: clearing will lag trading by months, creating a period where trades can be executed but settlement remains constrained. This lag introduces operational risk and liquidity friction, a necessary cost of building the new 24/7 system.

The Flow Impact: Volume, Liquidity, and the Winner-Take-All Effect

The primary flow benefit of 24/7 trading will accrue to institutions and high-frequency traders (HFTs) arbitraging price gaps, not to retail traders. Extended hours sessions, which now run from 4:00 AM to 9:30 AM and 4:00 PM to 8:00 PM Eastern Time, are dominated by institutional activity in the early pre-market. This creates a clear arbitrage opportunity: HFTs can exploit the wide bid-ask spreads and price discovery imbalances that persist until the regular session opens. For retail traders, the benefit is more about access to news and earnings, but the thin liquidity means they are more likely to face worse prices and higher volatility.

Exchanges are expanding hours explicitly to capture more volume and fees. The move is a direct response to the meteoric rise in retail investor activity and the global demand for trading during local waking hours. By extending their own hours, major exchanges like Nasdaq and NYSE aim to keep that flow on their platforms rather than letting it migrate to alternative trading systems (ATS) used by brokers. This is a classic revenue play, as more trading volume translates directly into higher transaction fees and market data revenue.

The 24X Exchange's pursuit of exemptive relief to operate overnight creates a new battleground for market share. The exchange has already been registered as a national securities exchange, but the SEC's 2024 approval explicitly tied its ability to start overnight trading to the concurrent operation of Securities Information Processors (SIPs). Now, 24X seeks to bypass that condition, arguing the SIPs should have extended their hours by now. This move, backed by a comment letter from Better Markets warning of worse prices and riskier behavior, sets up a regulatory fight. The outcome will determine whether a new, fragmented overnight market emerges, competing directly with the established exchanges for the high-value arbitrage flow.