The takeaway
Janus International Group Inc shows a pronounced seasonal pattern over 7 years of data — strongest in January (+6.8%) and softest in September (−7.0%).
Right now
In July, the stock has risen 83% of years, averaging +6.1%, about +4.0 pts better than the S&P 500.
The full picture
Janus International Group Inc's most dependable month has been January, higher in 5 of 6 years; September has been its least reliable, up just 17% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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| 2025 | ||||||||||||
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| 2019 | — | — | — | — | — | — | — | — | — | — | — |
Month by month
The stock's clearest edge over the S&P 500 lands in January (+7.0 pts); it has trailed the market most in September (−6.8 pts).
“vs S&P” is Janus International Group Inc’s average for a month minus the S&P 500’s average for that same month — isolating Janus International Group Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, January has closed higher 80% of the time versus 83% across the last 7 years — the pattern is strengthening.
Figures are the typical (median) January return and how often it rose — the last 5 years versus the last 7(the heatmap’s default window). This verdict stays anchored to that 7-year window even if you zoom the chart, so it never disagrees with the badges above.
In plain English
Strip the year back and a single month does the heavy lifting: January, up in 5 of 6 Januaries while the other eleven tend to blur together.
Its average (+6.8%) and median (+8.9%) land within a hair of each other — the tell of steady, year-after-year gains rather than one outlier doing the work. That reliability comes with real swings, mind — even January ranges by 11.1% from year to year, so any single year can land far from the average. Crucially, the gain is the stock's own rather than a rising tide's: January has cleared the S&P 500 by +7.0 points above the index. That consistency sets it apart from the field, where the average stock manages January only about 53% of the time.
The strength clusters rather than stands alone — November–January forms a firm stretch that carries much of the year. The weaker half of the year is plainer: September has been the soft spot — the weakest of 5 months that average a loss (−7.0%), and the edge isn't year-round — the stock has trailed the S&P 500 in September, March, and October. Its roughest month on record was a −35.4% November in 2025 — a reminder of how hard even a seasonal name can fall.
If anything it has sharpened recently — the last five Januaries run ahead of the earlier years.
The takeaway is less about when to buy than what to expect: January aside, the stock's months offer little reliable tilt. With a short 7-year record, the signal is best held loosely.
Short answers on the stock's best month (January), its worst (September), and whether it really trades seasonally.
Yes, to a pronounced degree. Since 2019 its best month (January, +6.8%) has run well ahead of its worst (September, −7.0%) — the heatmap above shows how steady that gap has been year to year.
January has been the strongest, averaging +6.8% and closing higher in 5 of 6 years since 2019.
It's the weakest, averaging −7.0% — historically a soft spot, though it still varies from year to year.
Explore
These names have the strongest July track records on record — a starting point for comparison.
Before you trade