Q4 Trading Guide: October to December, the Busiest Quarter of the Year

Q4 2026 key dates for traders

October: earnings season takes over

Q3 earnings season opened with PepsiCo and Delta in the second week of October, then the big banks, JPMorgan, Wells Fargo, Citigroup and Goldman Sachs, all reported on October 13. From here, hundreds of companies report every week into early November, and the largest tech companies typically report in the last week of October.

Markets price expectations, not results. As of October 9, FactSet’s consensus had S&P 500 earnings growing 29.6 percent year over year for the quarter, up from 26.7 percent at the end of June. When the bar is that high, a company can report record numbers and still sell off. The gap between what was expected and what was delivered, and especially what management guides for next quarter, is where the movement lives.

How earnings reactions actually trade

• Most companies report before the open or after the close, so the first and often largest reaction happens in pre-market or after-hours trading, on thinner liquidity.
• Guidance and the conference call can reverse the headline move within minutes. The first print is not the final verdict.
• Stocks travel in convoys. Bank results reprice all of financials, and one chipmaker’s guidance moves every AI-adjacent name before its peers report.
• Implied volatility usually drops sharply once the number is out, which matters if you trade options around the release.

October also carries a reputation. It is not the weakest month on average, that has historically been September, but it has a long record as the most volatile, with the widest intramonth ranges and a history that includes 1929, 1987 and 2008.

November: the Fed, peak earnings and the pivot to the consumer

The Federal Open Market Committee meets October 27 and 28, with the decision at 2:00 p.m. ET on the 28th, right in the middle of the reporting cycle. It meets again December 8 and 9. The December meeting comes with a new Summary of Economic Projections, the dot plot, which gives markets more to react to than the rate decision alone.

Earnings season peaks in late October and the first half of November, then thins out. Attention pivots to the consumer: the big retailers report in the second half of November, and companies that guided cautiously in October get re-rated on actual holiday spending data.

Historically, November has been one of the strongest months of the year for the S&P 500, and it opens the November-to-April stretch that the Stock Trader’s Almanac calls the best six months. A tendency, not a promise.

December: thin tape and year-end mechanics

December trades differently. Volume thins as desks close their books, especially around the early closes on November 27 and December 24, which means smaller orders move prices more. Much of what happens is about the calendar, not company fundamentals. Reading that plumbing as conviction is the classic December mistake.

Tax-loss selling

US investors can realise losses to offset gains, and the last trading day of the year is the cut-off, so the year’s losers often face extra selling into December. Many mutual funds end their tax year on October 31, so some of that selling arrives earlier than people expect. Wash-sale rules disallow a loss if a substantially identical position is bought within 30 days before or after the sale, which is one reason some beaten-down names rebound in January rather than in late December.

Window dressing

Some funds add the year’s winners and trim the losers before holdings reports are published. The evidence for its price impact is mixed, but it fits the same theme: year-end flows can move a stock without anything changing in the business.

The Santa Claus rally

Yale Hirsch of the Stock Trader’s Almanac defined it as the last five trading days of December plus the first two of January. This year that window runs from December 24 to January 5. Since 1950, the S&P 500 has averaged a gain of about 1.3 percent over those seven sessions and finished higher about 78 percent of the time, against roughly 0.3 percent for an average seven-day stretch. The effect has been weaker in recent years, so treat it as a hypothesis to test, not a trade.

How to trade Q4 without living at your screen

The common thread in all three months is that things move fast, often outside regular hours, and no one can watch everything. That is the problem Bufflo is built for.

Earnings season: let the screen build itself

Describe what you care about in plain English and a real-time screener builds itself, updating through pre-market, regular hours and after-hours, which is where most earnings reactions happen. For example:

Run several in parallel: one for your watchlist, one for gappers, one for halts.

Fed days: alerts with your own rules

Set alerts with your own trigger and re-arm rules, and let your phone do the watching through the statement and the press conference:

Seasonality: test it before you trust it

Before the seasonal lore tempts you into a trade, test it. Define entry, exit, stop and target, add your commission assumptions, and run the idea against historical data: net P&L, win rate and profit factor, trade by trade. The Santa Claus rally is a good story. Whether your version of it ever made money is a checkable fact.

When something does set up, the chart, the news and your connected broker accounts are in the same workspace. US stocks, futures, crypto and FX in one tab.

The workspace is open at bufflo.io: free, no card, no signup. Set it up before the mega-cap reports land, not after. If your current setup involves too many tabs, start here.

Frequently asked questions