The takeaway
iShares Bloomberg Roll Select Broad Commodity ETF shows a slight seasonal lean over 8 years of data — strongest in January (+1.3%) and softest in March (−0.4%).
Right now
In July, the fund has risen 50% of years, averaging +1.2%, roughly 1.0 pts behind the S&P 500.
The full picture
iShares Bloomberg Roll Select Broad Commodity ETF's most dependable month has been January, higher in 6 of 7 years; March has been its least reliable, up just 43% of the time.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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| 2018 | — | — | — |
Month by month
The fund's clearest edge over the S&P 500 lands in January (+1.5 pts); it has trailed the market most in November (−3.1 pts).
“vs S&P” is iShares Bloomberg Roll Select Broad Commodity ETF’s average for a month minus the S&P 500’s average for that same month — isolating iShares Bloomberg Roll Select Broad Commodity ETF’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, January has closed higher 100% of the time versus 86% across the last 8 years — the pattern is strengthening.
Figures are the typical (median) January return and how often it rose — the last 5 years versus the last 8(the heatmap’s default window). This verdict stays anchored to that 8-year window even if you zoom the chart, so it never disagrees with the badges above.
In plain English
Dependability is the through-line here. January stands out, higher in 6 of 7 Januaries, but it heads a clutch of months that pull the year reliably upward.
Its average (+1.3%) and median (+1.5%) land within a hair of each other — the tell of steady, year-after-year gains rather than one outlier doing the work. Crucially, the gain is the fund's own rather than a rising tide's: January has cleared the S&P 500 by +1.5 points above the index. That consistency sets it apart from the field, where the average stock manages January only about 53% of the time.
A few other months pull their weight: April, May, and June have also closed higher more often than not. On the other side of the ledger, 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, March, and June. Its roughest month on record was a −11.3% March in 2020 — a reminder of how hard even a seasonal name can fall.
January has now closed higher 5 years running. If anything it has sharpened recently — the last five Januaries run ahead of the earlier years.
The takeaway is less about when to buy than what to expect: January aside, the fund's months offer little reliable tilt. With a short 8-year record, the signal is best held loosely.
Short answers on the fund's best month (January), its worst (March), and whether it really trades seasonally.
Only mildly. The fund's months are fairly even — January is the firmest (+1.3%) and March the softest (−0.4%), a narrow spread that points to weak seasonality rather than a strong calendar effect.
January has been the strongest, averaging +1.3% and closing higher in 6 of 7 years since 2018.
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.
Before you trade