Citadel Securities, one of the world's largest market makers, is doubling down on Asia as demand for round-the-clock US stock trading grows. The firm is expanding its office space in Singapore by about 40% and in Sydney by about 65%, on top of recent additions in Hong Kong, according to a Reuters report. The move is designed to put more staff on the ground to serve clients in the region who increasingly trade US equities outside regular New York hours.
The expansion is not just about square footage. Citadel Securities plans to hire traders, technologists, and support staff across the region next year. It is also broadening its product lineup in Asia, adding US investment-grade credit—high-quality corporate bonds—and structured products, while exploring the possibility of an onshore brokerage in China.
Why the timing matters
The push toward longer trading hours is a key driver. Major US exchanges, including Nasdaq and Cboe, plan to extend US equities trading to nearly around-the-clock schedules starting in December. That shift could funnel more activity into Asian time zones, where investors are awake while US markets are traditionally closed.
Citadel Securities estimates that pre- and post-market trading already accounts for as much as 10% of US volume, while "overnight" trading—the window that falls during Asian business hours—is roughly 1% today. That small slice could grow significantly as exchanges lengthen their sessions.
Longer hours may sound like a win for investors, but they also come with challenges. When trading is spread over a longer day, the same amount of activity is distributed more thinly. Overnight sessions typically have fewer buyers and sellers at each price, which can widen bid-ask spreads—the gap between the buying and selling price—and make large orders move prices more sharply.
That is where market makers like Citadel Securities come in. Firms with 24-hour staffing and fast systems can quote prices more consistently when liquidity is thin, potentially capturing more of the spread and client flow. They also face stiffer competition from other liquidity providers such as IMC, Jane Street, and Susquehanna, all of which are vying for a piece of the overnight action.
What it means for investors
For asset managers and hedge funds executing US stock trades from Asia, the key change is that execution costs and short-term price swings may depend more on when an order hits the market, not just what they trade. A buy order placed during the thin overnight session could face wider spreads and more slippage than the same order placed during peak New York hours.
For everyday investors, the trend toward longer trading hours could eventually mean more flexibility to trade US stocks at times that suit their schedules, rather than being limited to the traditional 9:30 a.m. to 4 p.m. Eastern window. However, it also means being aware that trading outside those core hours can be riskier due to lower liquidity.
The expansion by Citadel Securities is a signal that major players expect the overnight market to grow. As exchanges extend their hours and more Asian clients participate, the competitive landscape among market makers is likely to intensify. That could lead to tighter spreads over time, but it may also increase the complexity of trading in a market that never sleeps.
Investors should keep an eye on how the extended hours affect market quality. If liquidity remains thin, the cost of trading overnight could stay higher than during regular hours. But if volumes pick up and market makers compete aggressively, the overnight session could become a more viable option for a broader range of participants.
For now, Citadel Securities' move is a bet that the future of US equities trading is global and round-the-clock. Whether that bet pays off will depend on how quickly investors embrace the new hours and how well market makers adapt to the challenges of a 24-hour market.
