The takeaway
SPDR® S&P Oil & Gas Equipment & Services ETF shows a moderate seasonal pattern over 10 years of data — strongest in December (+1.1%) and softest in August (−2.7%).
Right now
In July, the fund has risen 60% of years, averaging +1.1%, roughly 1.0 pts behind the S&P 500.
The full picture
SPDR® S&P Oil & Gas Equipment & Services ETF's most dependable month has been December, higher in 8 of 10 years; August has been its least reliable, up just 30% of the time.
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Month by month
The fund's clearest edge over the S&P 500 lands in September (+2.0 pts); it has trailed the market most in March (−5.8 pts).
“vs S&P” is SPDR® S&P Oil & Gas Equipment & Services ETF’s average for a month minus the S&P 500’s average for that same month — isolating SPDR® S&P Oil & Gas Equipment & Services ETF’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, December has closed higher 80% of the time versus 80% across the last 10 years — the pattern is weakening.
Figures are the typical (median) December 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
This is a fund you can almost set a calendar by, and December is the anchor — it has closed higher in 8 of 10 Decembers, the steadiest beat on its year.
The strength looks broad-based rather than freakish: its average (+1.1%) and median (+2.8%) sit close together, so no single blow-out year is flattering the figure. That reliability comes with real swings, mind — even December ranges by 11.2% from year to year, so any single year can land far from the average. Set against the S&P 500, mind, December is close to a wash — the gain mirrors the market more than it beats it. Few peers keep such company in December — the typical stock clears it just 58% of the time.
It doesn't stand entirely alone — May, June, and July have leaned firm as well, if less emphatically. At the other end of the calendar, August has been the soft spot — the weakest of 3 months that average a loss (−2.7%), and the edge isn't year-round — the fund has trailed the S&P 500 in March, August, and February. Its roughest month on record was a −57.9% March in 2020 — a reminder of how hard even a seasonal name can fall.
The pattern has softened of late, December's last five years slipping below its longer-run record.
For a fund this dependable in December, the sharper question is the rest of the year — outside its strong stretch, the calendar gives far less to lean on. With returns that swing hard year to year, the signal is best held loosely.
Short answers on the fund's best month (December), its worst (August), and whether it really trades seasonally.
Yes, to a moderate degree. Since 2016 its best month (December, +1.1%) has run well ahead of its worst (August, −2.7%) — the heatmap above shows how steady that gap has been year to year.
December has been the strongest, averaging +1.1% and closing higher in 8 of 10 years since 2016.
It's the weakest, averaging −2.7% — 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