The takeaway
PDF Solutions Inc shows a pronounced seasonal pattern over 10 years of data — strongest in November (+13.7%) and softest in August (−7.0%).
Right now
In July, the stock has risen 60% of years, averaging +6.2%, about +4.0 pts better than the S&P 500.
The full picture
PDF Solutions Inc's most dependable month has been November, higher in 8 of 10 years; August has been its least reliable, up just 10% of the time.
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Month by month
The stock's clearest edge over the S&P 500 lands in November (+11.3 pts); it has trailed the market most in August (−7.3 pts).
“vs S&P” is PDF Solutions Inc’s average for a month minus the S&P 500’s average for that same month — isolating PDF Solutions Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, November has closed higher 80% of the time versus 80% across the last 10 years — the pattern is weakening.
Figures are the typical (median) November return and how often it rose — the last 5 years versus the last 10(the heatmap’s default window). This verdict stays anchored to that 10-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: November, up in 8 of 10 Novembers while the other eleven tend to blur together.
Its average (+13.7%) and median (+14.4%) 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 November ranges by 11.6% 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: November has cleared the S&P 500 by +11.3 points above the index. That consistency sets it apart from the field, where the average stock manages November only about 62% of the time.
A few other months pull their weight: January, June, and July have also closed higher more often than not. The weaker half of the year is plainer: August 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 August, April, and December. Its roughest month on record was a −20.7% August in 2023 — a reminder of how hard even a seasonal name can fall.
A long streak recently broke — November had risen 5 years straight before a −7.5% reading in 2025. The pattern has softened of late, November's last five years slipping below its longer-run record.
The takeaway is less about when to buy than what to expect: November aside, the stock's months offer little reliable tilt.
Short answers on the stock's best month (November), its worst (August), and whether it really trades seasonally.
Yes, to a pronounced degree. Since 2016 its best month (November, +13.7%) has run well ahead of its worst (August, −7.0%) — the heatmap above shows how steady that gap has been year to year.
November has been the strongest, averaging +13.7% and closing higher in 8 of 10 years since 2016.
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