The takeaway
C3 Ai Inc shows a pronounced seasonal pattern over 6 years of data — strongest in May (+34.3%) and softest in December (+1.8%).
Right now
In July, the stock has fallen 20% of years, averaging −4.7%, roughly 6.8 pts behind the S&P 500.
The full picture
C3 Ai Inc's most dependable month has been May, higher in 5 of 5 years; December has been its least reliable, up just 17% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Win rate % | ||||||||||||
| Median return % | ||||||||||||
| 2025 | ||||||||||||
| 2024 | ||||||||||||
| 2023 | ||||||||||||
| 2022 | ||||||||||||
| 2021 | ||||||||||||
| 2020 | — | — | — | — | — | — | — | — | — | — | — |
Month by month
The stock's clearest edge over the S&P 500 lands in May (+33.6 pts); it has trailed the market most in April (−19.5 pts).
“vs S&P” is C3 Ai Inc’s average for a month minus the S&P 500’s average for that same month — isolating C3 Ai Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, May has closed higher 100% of the time versus 100% across the last 6 years — the pattern is holding.
Figures are the typical (median) May return and how often it rose — the last 5 years versus the last 6(the heatmap’s default window). This verdict stays anchored to that 6-year window even if you zoom the chart, so it never disagrees with the badges above.
In plain English
The seasonal story is really one month's story — May. It has closed higher in all 5 Mays, a concentration the rest of the calendar can't touch.
A typical May brings +21.8%, a shade under the +34.3% average. That reliability comes with real swings, mind — even May ranges by 41.7% from year to year, so any single year can land far from the average. Better still, that strength is the stock's own and not just a buoyant market — May has outpaced the S&P 500 by +33.6 points on average. Few peers keep such company in May — the typical stock clears it just 55% of the time.
It doesn't stand entirely alone — October and November have leaned firm as well, if less emphatically. The weaker half of the year is plainer: December is the year's low point, though even there the stock has stayed positive on average (+1.8%), a sign every month leans up, and the edge isn't year-round — the stock has trailed the S&P 500 in April, August, and September. Its roughest month on record was a −47.4% April in 2023 — a reminder of how hard even a seasonal name can fall.
May has now closed higher 5 years running.
For a stock this dependable in May, the sharper question is the rest of the year — outside its strong stretch, the calendar gives far less to lean on. With a short 6-year record and returns that swing hard year to year, the signal is best held loosely.
Short answers on the stock's best month (May), its worst (December), and whether it really trades seasonally.
Yes, to a pronounced degree. Since 2020 its best month (May, +34.3%) has run well ahead of its worst (December, +1.8%) — the heatmap above shows how steady that gap has been year to year.
May has been the strongest, averaging +34.3% and closing higher in all 5 years on record since 2020.
It's the weakest month, but it has still averaged a small gain (+1.8%) — quiet rather than genuinely bad.
Explore
These names have the strongest July track records on record — a starting point for comparison.
Before you trade