PMMFvsBILETF Comparison
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iShares Prime Money Market ETF (PMMF) and State Street SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) belong to the same industry segment: Money Market Bonds. PMMF's top 2 sector exposures are Finance and Government Agencies. In contrast, BIL's top sector exposures are Sovereign. PMMF is more expensive with a Total Expense Ratio (TER) of 0.2%, versus 0.1353% for BIL. PMMF is up 2.43% year-to-date (YTD) with +$304M in YTD flows. BIL performs worse with 2.37% YTD performance, and +$3.49B in YTD flows. Run a side-by-side ETF comparison of PMMF and BIL below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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PMMF vs BIL performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/01/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | PMMF BIL | +0.29%+0.28% | +0.92%+0.90% | +2.43%+2.37% | +3.81%+3.70% | n/a+14.11% | n/a+19.29% |
| Flows | PMMF BIL | +$60M-$953M | +$152M+$198M | +$304M+$3.49B | +$421M+$4.34B | -+$16.88B | -+$34.18B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | PMMF BIL | +0.14%+0.14% | +0.14%+0.15% | n/a+0.19% | n/a+0.20% |
| Max drawdown | PMMF BIL | n/an/a | n/an/a | n/an/a | n/a-0.05% |
| Max drawdown duration | PMMF BIL | n/an/a | n/an/a | n/an/a | n/a274d |
Trading data
PMMF | BIL | |
Last sale 9/2/2026 at 3:34 PM | $91.40 | |
| Previous close 09/01/2026 | $91.39 | |
| Consolidated volume 09/01/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of August 31, 2026
1-year trailing difference
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PMMF
is actively managed and doesn’t replicate an indexPMMF | BIL | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/2/2026 at 3:34 PM
Live
Closed
PMMF | BIL | |
|---|---|---|
| Last price | – | $91.40 |
| 1D performance | – | +0.01% |
| AuM | $725.32 M | $46.18 B |
| E/R | 0.2% | 0.1353% |
Characteristics
PMMF | BIL | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | iShares | State Street Investment Management |
| Benchmark | - | Bloomberg U.S. Treasury Bills 1-3 Months Index |
| N° of holdings | 4 | 18 |
| Asset class | - | Fixed Income |
| Trailing 12m distribution yield | Join | Join |
| Inception date | February 4, 2025 | May 25, 2007 |
| ESG | No | No |
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Exposure
Countries
PMMF
Data will be available soon
BIL
USA
98.9%
Other
1.1%
Sectors
PMMF
Data will be available soon
BIL
Sovereign
98.9%
Other
1.1%
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Diversification
PMMF
Data will be available soon
BIL
Total weight of top 15 holdings out of 15
91.95%
Top 15 holdings
Data as of July 31, 2026
PMMF
Data will be available soon
BIL
USA, Bills 0% 3sep2026, USD (364D)
10.37%
USA, Bills 0% 10sep2026, USD (182D)
10.10%
USA, Bills 0% 29oct2026, USD (364D)
8.05%
USA, Bills 0% 1oct2026, USD (364D)
7.34%
USA, Bills 0% 17sep2026, USD (182D)
7.01%
USA, Bills 0% 24sep2026, USD (182D)
6.94%
USA, Bills 0% 22sep2026, USD (119D)
5.93%
USA, Bills 0% 22oct2026, USD (182D)
5.86%
USA, Bills 0% 8oct2026, USD (182D)
5.76%
USA, Bills 0% 15oct2026, USD (182D)
5.23%
USA, Bills 0% 1sep2026, USD (119D)
5.05%
USA, Bills 0% 15sep2026, USD (119D)
4.72%
USA, Bills 0% 8sep2026, USD (119D)
4.36%
USA, Bills 0% 29sep2026, USD (119D)
2.62%
USA, Bills 0% 27oct2026, USD (119D)
2.61%
Frequently asked questions about PMMF and BIL
How have the PMMF and BIL ETFs performed in 2026?
As of September 1, 2026, PMMF is up 2.43% year-to-date (YTD), while BIL has returned 2.37%. That puts PMMF better performer ahead so far this year.
Which ETF is attracting more investor money: PMMF or BIL?
Year-to-date, the PMMF ETF saw +$304M in flows, compared to +$3.49B for BIL.
Which ETF is more volatile: PMMF or BIL?
Over the past year, PMMF had a volatility of 0.14%, while BIL experienced 0.15%.
Which ETF is bigger: PMMF or BIL?
As of September 1, 2026, PMMF holds $725.32 M in assets under management (AUM), while BIL manages $46.18 B.
What are the top holdings of the PMMF ETF and BIL ETF?
PMMF top holdings include US46223WAF05, US89115M3R51 and US31845TAN00. BIL holds in its top three: USA, Bills 0% 3sep2026, USD (364D), USA, Bills 0% 10sep2026, USD (182D) and USA, Bills 0% 29oct2026, USD (364D).
Which ETF is more diversified: PMMF or BIL?
PMMF holds 114 securities with 5.6% of its assets in the top 15. BIL has 18 securities and a top 15 weight of 91.95%.
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