Citadel Securities Turns Bullish on US Stocks for Q4, Cites 5 Tailwinds

Citadel Securities is turning more constructive on US equities heading into the fourth quarter, arguing that September's selloff cleared the excess use needed to set up a recovery. Scott Rubner, the firm's head of equity and equity-derivatives strategy, had warned in mid-September that stocks could trade lower into month-end. He now frames early-Q4 weakness as an opportunity rather than a reason to retreat, and Citadel has said a full fourth-quarter playbook is to follow. Rubner's case rests on flows and positioning, not valuation.

Context — Why Citadel's Q4 Call Matters Now

In mid-September, Rubner warned clients that stocks could fall into month-end, citing an unfavourable supply and demand picture, a weak technical backdrop and a rapid souring of AI sentiment observed during a multi-country client roadshow. Even then, he said he would use weakness to add core longs. That shift has now gone further: Citadel regards the September reset as largely complete.

The comparable the firm itself supplies is the midterm-year pattern. In US midterm election years, the S&P 500 has historically gained more than 5.5% on average in the fourth quarter from the end of September, versus just under 3% across all years, with the typical midterm path turning higher soon after quarter-end.

The catalyst chain runs through positioning. use was cut most aggressively in the parts of the market where sentiment fell furthest, leaving a cleaner base for buyers. September also marks the seasonal low point for retail buying, which tends to pick up afterwards.

The macro backdrop cuts the other way. The Federal Reserve sits on a tightening path, though not a fast one, and elevated oil prices linked to the Iran war keep inflation pressure alive. That combination can push yields higher and test equity valuations regardless of positioning.

Timing reinforces the argument. Third-quarter earnings begin in mid-October, and buyback windows reopen progressively through early November. Both give the flows thesis a near-term test rather than a vague promise.

Data — What the Numbers Show

September's activity data underlines how subdued the month was. Cash-equity volumes fell to their lowest level of the year relative to their one-year average, and overall stock trading activity ran about a quarter below its June peak.

The seasonal volume pattern supports the rebound case. Over the past four years, cash-equity volumes have risen around 8% on average from September to October, with options activity climbing roughly 15% in recent years.

The buyback calendar is the most concrete support. More than half of the S&P 500 by weight returns to an open buyback window by 1 November, and almost all of it by 8 November, alongside fresh authorisations announced with third-quarter results.

The earnings base is strong. The second-quarter season delivered earnings growth of around 33% and the strongest pattern of upward revisions since at least 2000 — a high bar for the third quarter to clear.

Driver	Figure cited
Midterm-year Q4 S&P 500 average gain (from end-Sept)	More than 5.5%
All-year Q4 S&P 500 average gain	Just under 3%
S&P 500 weight back in open buyback window by 1 Nov	More than half
S&P 500 weight back in open buyback window by 8 Nov	Almost all
Q2 2026 earnings growth	Around 33%
September-to-October cash-equity volume rise (4-yr average)	Around 8%

Against the midterm-year average of more than 5.5%, the all-year figure of just under 3% shows how much of the seasonal case depends on the election calendar rather than on a generic fourth-quarter pattern.

Analysis — What It Means for Markets and Sectors

Citadel's five supports — midterm seasonality, the buyback window, cleaner positioning, the retail-buying trough and returning earnings — point to a flows-led recovery rather than a valuation-led one. That distinction matters for how the call would express itself in prices.

Tech and AI-linked names are the likeliest first beneficiaries. Rubner's argument is that sentiment and use were cut hardest exactly where AI enthusiasm soured fastest, so the positioning reset is deepest there. A flows-based bounce would therefore show up in those names before broad indices.

The buyback calendar shapes sector exposure differently. Companies with open windows and fresh authorisations have a mechanical bid underneath them into early November, which favours large-cap names that dominate the S&P 500 by weight — the same cohort that makes up more than half the index by weight by 1 November.

The counter-argument is macro. A tightening Fed plus oil-driven inflation from the Iran war can lift yields and compress equity multiples, which would blunt a positioning-driven rally. Flows can support prices for a while, but they do not override a valuation reset if rates move sharply.

The second risk is that the flows simply do not arrive. Rubner has framed the central question for the quarter as whether earnings and buybacks actually bring investors back into the market — the call is conditional on participation returning, not on sentiment alone. Positioning is cleaner, but clean positioning is not the same as committed buying.

Outlook — What to Watch Next

The first test is the mid-October start of third-quarter earnings, which Citadel identifies as the point where the anticipated rebound in participation either materialises or does not. A second-quarter season with around 33% earnings growth and the strongest upward revisions since at least 2000 sets a high comparison.

The second catalyst is the buyback window. More than half of the S&P 500 by weight is back in an open window by 1 November, and almost all of it by 8 November. Watch whether fresh authorisations accompany third-quarter results.

The third is volume. September cash-equity volumes were the year's lowest relative to their one-year average, and activity ran about a quarter below the June peak. If the historical September-to-October rise of around 8% in cash equities and 15% in options repeats, the flows thesis gains confirmation.

On the macro side, oil prices tied to the Iran war and the Fed's tightening path are the variables that could push yields higher and test the call. Citadel has said a full fourth-quarter playbook is to follow.

Frequently Asked Questions

What does Citadel Securities' Q4 call mean for retail investors?

It is a positioning and flows view, not a valuation or earnings forecast. Rubner argues use was cut hardest where sentiment fell furthest, and that September marked the seasonal low for retail buying. For retail investors, the practical read is that any early-October weakness is framed by the firm as a buying opportunity rather than a warning. It is informational only and not investment advice.

Why has Citadel turned bullish on US stocks now?

The firm says September's reset largely cleared excess use. Rubner had warned in mid-September that stocks could fall into month-end on an unfavourable supply and demand picture and a rapid souring of AI sentiment. With that clear-out done, he now points to midterm seasonality, the reopening buyback window, cleaner positioning, the retail-buying trough and returning earnings as the five supports for a fourth-quarter recovery.

What could derail the fourth-quarter rebound?

Two risks stand out. The first is macro: a Fed on a tightening path plus oil-driven inflation from the Iran war could push yields higher and test equity valuations regardless of positioning. The second is that the flows do not show up — Citadel frames the quarter's central question as whether earnings and buybacks actually bring investors back. Mid-October earnings are the first real test of that.

Bottom Line

Citadel's call is a flows bet: September cleared the use, and buybacks plus midterm seasonality must now deliver the buyers.

Disclaimer: This article is for informational purposes only and does not constitute investment advice. CFD trading carries high risk of capital loss.