Is the Santa Claus rally real?
Half-truth. Santa's seven days beat an ordinary seven-day stretch by 1.2 points since 1926, and by 0.2 points in the last 20 years. A no-show Santa didn't reliably spoil the year.
Stocks do better in the last 5 trading days of December and the first 2 of January than in an ordinary 7-day stretch.It held: +1.4% above cash against +0.2%, in both halves, the last 20 years and all 43 industries with enough history.
When the Santa window is down, the rest of the year (to the next Santa window) does worse than after a Santa window that is up.It went the other way, +8.2% to +7.0%. Halves and most industries disagreed; too few cases to be sure.
What is the Santa Claus rally?
The Santa Claus rally is the idea that stocks rise over the last five trading days of December and the first two of January.
A long-running trading almanac named it in 1972. It came with a rhyme that's still quoted: "If Santa Claus should fail to call, bears may come to Broad and Wall".
Broad Street and Wall Street meet at the New York Stock Exchange, and bears are falling markets. So there are two beliefs here. Santa usually brings gifts. And if he skips a year, watch out.
What exactly did we test?
We tested both beliefs.
Part one: does the seven-day Santa window do better than an ordinary seven-day stretch? We compared it with every other block of seven trading days in the same years, 3,633 of them.
Part two is the rhyme. We call a flat or down Santa window a no-show Santa. Is the rest of the year after one worse than after a Santa rally? The rest of the year runs to the next Santa window.
We used the whole US stock market from July 1926 to August 2026. That gives 100 Santa windows.
We measure every return above what cash in Treasury bills earned at the same time. When we compare two averages, the gap is in percentage points, or points for short.
Does Santa really come to Wall Street?
Usually, yes. The Santa window averaged +1.4% above cash, against +0.2% for an ordinary seven-day stretch.
It beat cash 77% of the time. Ordinary stretches beat cash 57% of the time.
Chart data
| Period | Santa window | Ordinary 7-day stretch |
|---|---|---|
| All years | +1.44% | +0.19% |
| First half 1926–1977 | +1.99% | +0.16% |
| Second half 1977–2026 | +0.89% | +0.23% |
| Before 1972 | +1.69% | +0.19% |
| Since 1972 | +1.22% | +0.19% |
| Last 20 years | +0.53% | +0.32% |
The gap is 1.2 points, and its likely range runs from +0.8 to +1.7 points. That stays well clear of zero, so luck is a poor explanation.
Santa showed up in every period we checked. The gap was +1.8 points in the first half of our data and +0.7 points in the second. It was +1.5 points before the almanac named it in 1972, and +1.0 points since.
Lately, though, Santa has been less generous. In the last 20 years, the window averaged +0.5% above cash, against +0.3% for an ordinary stretch. That's a gap of just +0.2 points.
In those years it beat cash 70% of the time, against 61% for an ordinary stretch. Still ahead, but only just.
Does a no-show Santa mean a bad year?
No, not on average. After a no-show Santa, the rest of the year averaged +8.2% above cash. After a Santa rally, it averaged +7.0%.
Chart data
| Period | After a no-show Santa | After a Santa rally |
|---|---|---|
| All years | +8.2% | +7.0% |
| First half 1926–1982 | +9.5% | +5.2% |
| Second half 1982–2026 | +7.0% | +9.4% |
| Before 1972 | +8.6% | +7.3% |
| Since 1972 | +8.0% | +6.7% |
| Last 20 years | +3.3% | +12.9% |
So the years after a no-show Santa did a little better, the other way from the rhyme. They also beat cash more often: 82% of the time, against 66%.
Don't read much into that either. Only 22 no-show Santas had a full year after them, against 77 rallies. The gap's likely range runs from -7.4 to +9.3 points, so it could easily be luck.
The halves disagree, too. In the first half of our data, years after a no-show Santa did better by 4.2 points. In the second half, they trailed by 2.4 points.
In the last 20 years, the rhyme had its moment. The gap was -9.6 points: the rest of the year averaged +3.3% above cash after a no-show Santa, against +12.9% after a rally.
But that rests on only 5 no-show Santas, and even then the bears mostly stayed home. Those years still beat cash 80% of the time.
Does it hold across industries?
Santa visited all the industries we could test. We repeated the test on the 43 of the 49 industries with enough history, and the window beat ordinary stretches in all 43.
The rhyme did worse. A no-show Santa was followed by a weaker year in only 19 of 43 industries.
Industries all move with the market, so these aren't independent votes.
What happens to the rest of January?
No clear difference either way: about the same over the century, and a gap in the last 20 years that could easily be luck.
The window runs from the close of January's second trading day, where Santa's window ends, to January's last close.
Chart data
| Period | After a Santa rally | After a no-show Santa |
|---|---|---|
| Rest of January all years | +0.69% | +0.91% |
| Rest of January last 20 years | +0.40% | -1.03% |
Over the century, the rest of January averaged +0.69% above cash after a Santa rally (77 years) and +0.91% after a no-show Santa (23 years). All Januaries averaged +0.74%. It beat cash 60% of the time after a rally, and 57% after a no-show.
In the last 20 years, the rhyme looks better, though on few cases: +0.40% after a rally, -1.03% after a no-show, -0.03% for all. It beat cash 64% and 50% of the time.
That gap of 1.43 points sounds big. But a single January swings a lot. Only 6 of those years had a no-show Santa, against 14 rallies, so even a gap this size could be luck.
Neither gap is clear; both could easily be luck. Santa, it seems, doesn't decide how January ends.
Why might Santa show up?
Nobody knows for sure, but people give a few reasons. There's holiday cheer, quiet trading while many traders are away, and fresh January money looking for a home.
We didn't test these explanations; they are reasons people give.
Over the century, most of the gift isn't January's doing, though: the five December days alone averaged +1.0% above cash. In the last 20 years, they averaged +0.2%.
As for the rhyme, a no-show Santa followed by a rough year is easy to remember. The years when nothing much happened are not.
What does this mean for you?
This is history, not a forecast. Santa has usually come, but a habit over 100 years tells you little about any single December.
A myth doesn't mean you should do the opposite. A no-show Santa is no signal to pile in, just as it's no signal to run.
Timing Santa would have meant slower growth. Holding stocks only in the Santa window, with cash otherwise, grew +4.4% a year in total return. Staying invested grew +9.9% a year in total return. In the last 20 years of data, the same rule grew +2.0% a year, against +11.5% for staying invested.
It sat in cash most of the time: it was in stocks only 3% of the time. For the same reason, its worst fall was tiny, -7.4% against -83.9%. In the last 20 years, its worst fall was -7.0%, against -54.7%.
Santa's seven days are a nice gift. They just aren't the whole present.
What's in the small print?
Data: the US total stock market and one-month Treasury bills from Kenneth R. French's data library (Tuck School of Business at Dartmouth), daily from July 1926 to August 2026, and 49 US industry portfolios from the same library.
Method: the Santa window runs from the close six trading days before the year's last close to the second trading day of January. Ordinary stretches are the other seven-day blocks between one Santa window and the next.
Returns are compounded and, except for the timing example, measured above T-bills. Returns are before taxes. The timing example pays a twentieth of a percent each time it switches. The likely ranges are 95% bootstrap intervals.
Checks: with raw returns instead of returns above cash, the Santa gap was +1.2 points. For the average industry it was +1.6 points.
Test many beliefs and about 1 in 20 with nothing behind it will pass the usual 95% standard by luck alone. So the main ranges are also shown at 99.67%, which allows for testing 15 calendar beliefs.
At 99.67%, the Santa gap's likely range widens from +0.8 to +1.7 points to +0.6 to +2.0 points, still above zero. The rhyme's widens to -12.3 to +12.6 points.
Overlaps: the Santa window holds the day before New Year's Day and the first trading days of January. Each has its own calendar belief, which we test separately.
Rest of January: its first days overlap our first-five-days test, and that test's own rest-of-January check sits inside this window too.
It counts 23 no-show Januaries, one more than the rhyme test, because January 2026 has no full year after it yet.
The gap, Santa rally minus no-show Santa, was -0.22 points over the century, likely range -2.27 to +1.72 points. In the last 20 years it was +1.43 points, likely range -2.10 to +4.89 points. This check has one window, so there was nothing to widen: its range stays at 95%.
What else did we test?
See all the calendar effects we tested, or how we test a myth.