The takeaway
ON Semiconductor Corporation shows a pronounced seasonal pattern over 10 years of data — strongest in July (+10.8%) and softest in April (0.0%).
Right now
In July, the stock has risen 90% of years, averaging +10.8%, about +8.7 pts better than the S&P 500.
The full picture
ON Semiconductor Corporation's most dependable month has been July, higher in 9 of 10 years; April has been its least reliable, up just 20% of the time.
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Month by month
The stock's clearest edge over the S&P 500 lands in July (+8.7 pts); it has trailed the market most in March (−4.5 pts).
“vs S&P” is ON Semiconductor Corporation’s average for a month minus the S&P 500’s average for that same month — isolating ON Semiconductor Corporation’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, July has closed higher 100% of the time versus 90% across the last 10 years — the pattern is strengthening.
Figures are the typical (median) July 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
Dependability is the through-line here. July stands out, higher in 9 of 10 Julys, but it heads a clutch of months that pull the year reliably upward.
Its average (+10.8%) and median (+8.2%) 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 July 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: July has cleared the S&P 500 by +8.7 points above the index. That consistency sets it apart from the field, where the average stock manages July only about 61% of the time.
The strength clusters rather than stands alone — July–September forms a firm stretch that carries much of the year. The weaker half of the year is plainer: April is the year's quietest corner, essentially flat on average, and the edge isn't year-round — the stock has trailed the S&P 500 in March, October, and April. Its roughest month on record was a −34.3% March in 2020 — a reminder of how hard even a seasonal name can fall.
July has now closed higher 7 years running. If anything it has sharpened recently — the last five Julys run ahead of the earlier years.
The takeaway is less about when to buy than what to expect: July aside, the stock's months offer little reliable tilt.
Short answers on the stock's best month (July), its worst (April), and whether it really trades seasonally.
Yes, to a pronounced degree. Since 2016 its best month (July, +10.8%) has run well ahead of its worst (April, 0.0%) — the heatmap above shows how steady that gap has been year to year.
July has been the strongest, averaging +10.8% and closing higher in 9 of 10 years since 2016.
It's the weakest month, but it has still averaged a small gain (0.0%) — quiet rather than genuinely bad.
Explore
These names have the strongest July track records on record — a starting point for comparison.
Before you trade