The takeaway
iShares Treasury Floating Rate Bond ETF shows a slight seasonal lean over 10 years of data — strongest in March (+0.2%) and softest in April (+0.1%).
Right now
In July, the fund has risen 80% of years, averaging +0.2%, roughly 2.0 pts behind the S&P 500.
The full picture
iShares Treasury Floating Rate Bond ETF's most dependable month has been March, higher in 10 of 10 years; April has been its least reliable, up just 70% of the time.
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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 iShares Treasury Floating Rate Bond ETF’s average for a month minus the S&P 500’s average for that same month — isolating iShares Treasury Floating Rate Bond ETF’s own seasonal edge from broad market drift.
Reality check
Over the last 5 years, March has closed higher 100% of the time versus 100% across the last 10 years — the pattern is holding.
Figures are the typical (median) March 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
Dependability is the through-line here. March stands out, higher in all 10 Marches, but it heads a clutch of months that pull the year reliably upward.
Its average (+0.2%) and median (+0.1%) land within a hair of each other — the tell of steady, year-after-year gains rather than one outlier doing the work. It is also the calendar's calmest month, its returns swinging least from year to year (a 0.1% spread), and even its worst March in 10 years lost only 0.0% — the gentlest downside anywhere on its calendar. That consistency sets it apart from the field, where the average stock manages March only about 56% 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: April 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.
March has now closed higher 10 years running. Reassuringly, the tendency has held its shape: the recent five years still track the years behind them.
The takeaway is less about when to buy than what to expect: March aside, the fund's months offer little reliable tilt.
Short answers on the fund's best month (March), its worst (April), and whether it really trades seasonally.
Only mildly. The fund's months are fairly even — March is the firmest (+0.2%) and April the softest (+0.1%), a narrow spread that points to weak seasonality rather than a strong calendar effect.
March has been the strongest, averaging +0.2% and closing higher in all 10 years on record since 2016.
It's the weakest month, but it has still averaged a small gain (+0.1%) — quiet rather than genuinely bad.
Explore
These names have the strongest July track records on record — a starting point for comparison.
Before you trade