The promise of the “January effect” looks all too real this year as early capital flows and a broadening of the market rally set the stage for gains across US equities, according to Citadel Securities.
Arguably the strongest month for inflows, still-elevated money-market balances sitting at a record $7.6 trillion promise to support the theory that U.S. stocks tend to rise more in January than in other months, according to Scott Rubner, Citadel Securities’ head of equity and equity derivatives strategy.
As markets reopened after the holiday pause, cash linked to retirement contributions, year-end bonuses and discretionary wealth mandates is moving quickly into passive risk assets.
That seasonal pattern aligns with past market performance. Since 1985, the Nasdaq 100 Index has posted gains in January about 70% of the time, averaging a 2.5% advance and rising nearly 6% in years when the tech-heavy benchmark finishes the month positive, Rubner wrote.
Flows are broadening beyond the market’s most crowded trades, even as volatility remains compressed relative to the month’s calendar of catalysts.
“What began as an AI-led profit cycle is increasingly diffusing across sectors, reinforcing market breadth and supporting a more durable earnings expansion for the entire equity market,” Rubner wrote.
Daytraders Driving
Retail activity remains elevated with individual investors buying call options in 35 out of the past 36 weeks. Citadel Securities estimates individual traders now account for roughly 60% of all Options Clearing Corp. customer volume.
“At this level of participation, retail is no longer marginal to market outcomes – they are a driver,” Rubner wrote.
After generating more than $20 billion in options profits in 2025, retail investors are entering January with fresh capital to deploy, reinforcing early-year momentum — particularly in themes such as quantum computing, robotics and automation, and space.
Institutional clients are also leaning into risky assets, with recent options flow skewed toward buying and concentrated in sectors including energy, utilities, real estate and materials.
The positioning reflects a shift toward lagging parts of the market as investors look to diversify away from a heavy concentration in stock index leaders, Rubner added.
At the same time, cross-asset correlations are compressing toward one-year lows, a signal of healthier market structure and greater scope for idiosyncratic returns.
While Citadel Securities expects some “healthy digestion” in February as allocations normalize and volatility reprices, any pullback would likely be viewed as an opportunity to reengage risk at more attractive levels, Rubner said.
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