The takeaway
ICU Medical Inc shows a slight seasonal lean over 10 years of data — strongest in August (−1.1%) and softest in October (−2.0%).
Right now
In July, the stock has risen 60% of years, averaging +1.4%, roughly 0.7 pts behind the S&P 500.
The full picture
ICU Medical Inc's most dependable month has been August, higher in 7 of 10 years; October has been its least reliable, up just 40% of the time.
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Month by month
The stock's clearest edge over the S&P 500 lands in February (+2.1 pts); it has trailed the market most in October (−3.0 pts).
“vs S&P” is ICU Medical Inc’s average for a month minus the S&P 500’s average for that same month — isolating ICU Medical Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, August has closed higher 60% of the time versus 70% across the last 10 years — the pattern is holding.
Figures are the typical (median) August 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
The seasonal story is really one month's story — August. It has closed higher in 7 of 10 Augusts, a concentration the rest of the calendar can't touch.
The strength looks broad-based rather than freakish: its average (−1.1%) and median (+1.1%) sit close together, so no single blow-out year is flattering the figure. That reliability comes with real swings, mind — even August ranges by 16.8% from year to year, so any single year can land far from the average. Few peers keep such company in August — the typical stock clears it just 52% of the time.
It doesn't stand entirely alone — February, July, and November have leaned firm as well, if less emphatically. At the other end of the calendar, October has been the soft spot — the weakest of 4 months that average a loss (−2.0%), and the edge isn't year-round — the stock has trailed the S&P 500 in October, May, and August.
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.
Short answers on the stock's best month (August), its worst (October), and whether it really trades seasonally.
Only mildly. The stock's months are fairly even — August is the firmest (−1.1%) and October the softest (−2.0%), a narrow spread that points to weak seasonality rather than a strong calendar effect.
August has been the strongest, averaging −1.1% and closing higher in 7 of 10 years since 2016.
It's the weakest, averaging −2.0% — 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