The takeaway
Mirion Technologies Inc shows a moderate seasonal pattern over 6 years of data — strongest in August (+4.5%) and softest in March (−3.4%).
Right now
In July, the stock has risen 40% of years, averaging +3.2%, about +1.1 pts better than the S&P 500.
The full picture
Mirion Technologies Inc's most dependable month has been August, higher in 5 of 6 years; March has been its least reliable, up just 20% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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| Median return % | ||||||||||||
| 2025 | ||||||||||||
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| 2021 | ||||||||||||
| 2020 | — | — | — | — | — | — | — |
Month by month
The stock's clearest edge over the S&P 500 lands in October (+8.8 pts); it has trailed the market most in March (−4.4 pts).
“vs S&P” is Mirion Technologies Inc’s average for a month minus the S&P 500’s average for that same month — isolating Mirion Technologies Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, August has closed higher 80% of the time versus 83% across the last 6 years — the pattern is holding.
Figures are the typical (median) August 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
This is a stock you can almost set a calendar by, and August is the anchor — it has closed higher in 5 of 6 Augusts, the steadiest beat on its year.
The strength looks broad-based rather than freakish: its average (+4.5%) and median (+4.2%) sit close together, so no single blow-out year is flattering the figure. No month is steadier: August's returns vary by just 4.5% year to year. Better still, that strength is the stock's own and not just a buoyant market — August has outpaced the S&P 500 by +4.2 points on average. Few peers keep such company in August — the typical stock clears it just 52% of the time.
August anchors a run, too: the August-through-October window has been the stock's reliable season. At the other end of the calendar, March has been the soft spot — the weakest of 3 months that average a loss (−3.4%), and the edge isn't year-round — the stock has trailed the S&P 500 in March, January, and April. Its roughest month on record was a −26.7% June in 2022 — a reminder of how hard even a seasonal name can fall.
Reassuringly, the tendency has held its shape: the recent five years still track the years behind them.
For a stock this dependable in August, 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, the signal is best held loosely.
Short answers on the stock's best month (August), its worst (March), and whether it really trades seasonally.
Yes, to a moderate degree. Since 2020 its best month (August, +4.5%) has run well ahead of its worst (March, −3.4%) — the heatmap above shows how steady that gap has been year to year.
August has been the strongest, averaging +4.5% and closing higher in 5 of 6 years since 2020.
It's the weakest, averaging −3.4% — 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