The takeaway
MFS Active Core Plus Bond ETF shows a slight seasonal lean over 2 years of data — strongest in June (+2.1%) and softest in July (−0.4%).
Right now
In July, the fund has fallen 0% of years, averaging −0.4%, roughly 2.6 pts behind the S&P 500.
The full picture
MFS Active Core Plus Bond ETF's most dependable month has been June, higher in 1 of 1 years; July has been its least reliable, up just 0% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Win rate % | ||||||||||||
| Median return % | ||||||||||||
| 2025 | ||||||||||||
| 2024 | — | — | — | — | — | — | — | — | — | — | — |
Month by month
The fund's clearest edge over the S&P 500 lands in February (+2.1 pts); it has trailed the market most in July (−2.6 pts).
“vs S&P” is MFS Active Core Plus Bond ETF’s average for a month minus the S&P 500’s average for that same month — isolating MFS Active Core Plus Bond ETF’s own seasonal edge from broad market drift.
Reality check
Not enough recent June history to say whether the pattern still holds.
Figures are the typical (median) June return and how often it rose — the last 1 years versus the last 2(the heatmap’s default window). This verdict stays anchored to that 2-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 June is the anchor — it has closed higher in all 1 Junes, the steadiest beat on its year.
The strength looks broad-based rather than freakish: its average (+2.1%) and median (+2.1%) sit close together, so no single blow-out year is flattering the figure. No month is steadier: June's returns vary by just 0.0% year to year, and even its worst June in 2 years lost only 2.1% — the gentlest downside anywhere on its calendar. Better still, that strength is the fund's own and not just a buoyant market — June has outpaced the S&P 500 by +1.8 points on average. Few peers keep such company in June — the typical stock clears it just 52% of the time.
It doesn't stand entirely alone — January, February, and May have leaned firm as well, if less emphatically. On the other side of the ledger, July 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 July, April, and December.
For a fund this dependable in June, the sharper question is the rest of the year — outside its strong stretch, the calendar gives far less to lean on. With a short 2-year record, the signal is best held loosely.
Short answers on the fund's best month (June), its worst (July), and whether it really trades seasonally.
Only mildly. The fund's months are fairly even — June is the firmest (+2.1%) and July the softest (−0.4%), a narrow spread that points to weak seasonality rather than a strong calendar effect.
June has been the strongest, averaging +2.1% and closing higher in its one year on record since 2024.
It's the weakest, averaging −0.4% — 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.
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