The takeaway
HealthStream Inc shows a moderate seasonal pattern over 10 years of data — strongest in June (+2.0%) and softest in January (−1.3%).
Right now
In July, the stock has fallen 50% of years, averaging −0.1%, roughly 2.3 pts behind the S&P 500.
The full picture
HealthStream Inc's most dependable month has been June, higher in 6 of 10 years; January 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 June (+1.7 pts); it has trailed the market most in November (−3.0 pts).
“vs S&P” is HealthStream Inc’s average for a month minus the S&P 500’s average for that same month — isolating HealthStream Inc’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, June has closed higher 80% of the time versus 60% across the last 10 years — the pattern is strengthening.
Figures are the typical (median) June 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
There's a real but measured seasonal tilt here, toward June — the firmest corner of the calendar, higher in 6 of 10 Junes.
The strength looks broad-based rather than freakish: its average (+2.0%) and median (+2.8%) sit close together, so no single blow-out year is flattering the figure. Better still, that strength is the stock's own and not just a buoyant market — June has outpaced the S&P 500 by +1.7 points on average.
It doesn't stand entirely alone — February and May have leaned firm as well, if less emphatically. On the other side of the ledger, January has been the soft spot — the weakest of 4 months that average a loss (−1.3%), and the edge isn't year-round — the stock has trailed the S&P 500 in November, July, and October. Its roughest month on record was a −16.0% May in 2025 — a reminder of how hard even a seasonal name can fall.
If anything it has sharpened recently — the last five Junes run ahead of the earlier years.
Treat it as a tendency rather than a rule — seasonality describes the past, not a promise.
Short answers on the stock's best month (June), its worst (January), and whether it really trades seasonally.
Yes, to a moderate degree. Since 2016 its best month (June, +2.0%) has run well ahead of its worst (January, −1.3%) — the heatmap above shows how steady that gap has been year to year.
June has been the strongest, averaging +2.0% and closing higher in 6 of 10 years since 2016.
It's the weakest, averaging −1.3% — 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