The takeaway
SPDR® SSgA Ultra Short Term Bond ETF shows a slight seasonal lean over 10 years of data — strongest in July (+0.3%) and softest in March (−0.2%).
Right now
In July, the fund has risen 100% of years, averaging +0.3%, roughly 1.8 pts behind the S&P 500.
The full picture
SPDR® SSgA Ultra Short Term Bond ETF's most dependable month has been July, higher in 10 of 10 years; March has been its least reliable, up just 60% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Win rate % | ||||||||||||
| Median return % | ||||||||||||
| 2025 | ||||||||||||
| 2024 | ||||||||||||
| 2023 | ||||||||||||
| 2022 | ||||||||||||
| 2021 | ||||||||||||
| 2020 | ||||||||||||
| 2019 | ||||||||||||
| 2018 | ||||||||||||
| 2017 | ||||||||||||
| 2016 |
Month by month
Across the year the fund has stayed close to the S&P 500 — no single month stands out as a real edge.
“vs S&P” is SPDR® SSgA Ultra Short Term Bond ETF’s average for a month minus the S&P 500’s average for that same month — isolating SPDR® SSgA Ultra Short Term Bond ETF’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, July has closed higher 100% of the time versus 100% across the last 10 years — the pattern is holding.
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
This is a fund you can almost set a calendar by, and July is the anchor — it has closed higher in all 10 Julys, the steadiest beat on its year.
The strength looks broad-based rather than freakish: its average (+0.3%) and median (+0.3%) sit close together, so no single blow-out year is flattering the figure. Few peers keep such company in July — the typical stock clears it just 61% of the time.
The lift is near-universal — strength runs through almost every month of the year, not one window. The weaker half of the year is plainer: March is the year's quietest corner, essentially flat on average, and the edge isn't year-round — the fund has trailed the S&P 500 in November, July, and April.
July has now closed higher 10 years running. Reassuringly, the tendency has held its shape: the recent five years still track the years behind them.
For a fund this dependable in July, 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 fund's best month (July), its worst (March), and whether it really trades seasonally.
Only mildly. The fund's months are fairly even — July is the firmest (+0.3%) and March the softest (−0.2%), a narrow spread that points to weak seasonality rather than a strong calendar effect.
July has been the strongest, averaging +0.3% and closing higher in all 10 years on record since 2016.
It's the weakest, averaging −0.2% — 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