SPTUvsBAMUETF Comparison
ETF 1
SPTU
State Street SPDR Portfolio Ultra Short T-Bill ETF
This fund is part of
Money Market Bonds
+0.03%
VS
State Street SPDR Portfolio Ultra Short T-Bill ETF (SPTU) belongs to the Money Market Bonds segment. Brookstone Ultra-Short Bond ETF (BAMU) is part of the US Aggregate Bonds segment. SPTU's top 1 sector exposures are Sovereign. In contrast, BAMU's top sector exposures are Sovereign and Non-Corporate. SPTU is less expensive with a Total Expense Ratio (TER) of 0.05%, versus 1.02% for BAMU. SPTU is up 2.86% year-to-date (YTD) with +$6M in YTD flows. BAMU performs worse with 2.06% YTD performance, and -$6M in YTD flows. Run a side-by-side ETF comparison of SPTU and BAMU 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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SPTU vs BAMU performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/16/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | SPTU BAMU | +0.35%+0.24% | +0.92%+0.69% | +2.86%+2.06% | +3.72%+2.71% | n/a+10.82% | n/an/a |
| Flows | SPTU BAMU | +$3M- | +$3M-$2M | +$6M-$6M | +$7M-$8M | -+$63M | -- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SPTU BAMU | +0.17%+0.30% | +0.16%+0.30% | n/a+0.34% | n/an/a |
| Max drawdown | SPTU BAMU | n/an/a | n/an/a | n/a-0.04% | n/an/a |
| Max drawdown duration | SPTU BAMU | n/an/a | n/an/a | n/a2d | n/an/a |
Trading data
SPTU | BAMU | |
Last sale 10/16/2026 at 1:30 PM | $25.05 | $25.27 |
| Previous close 10/15/2026 | $25.04 | $25.26 |
| Consolidated volume 10/15/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of October 17, 2026
1-year trailing difference
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BAMU
is actively managed and doesn’t replicate an indexSPTU | BAMU | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
Main metrics
Last update 10/16/2026 at 1:30 PM
Live
Closed
SPTU | BAMU | |
|---|---|---|
| Last price | $25.05 | $25.27 |
| 1D performance | +0.04% | +0.04% |
| AuM | $16.78 M | $65.68 M |
| E/R | 0.05% | 1.02% |
Characteristics
SPTU | BAMU | |
|---|---|---|
| Management strategy | Passive | Active |
| Provider | State Street Investment Management | Brookstone Asset Management |
| Benchmark | ICE BofA US Treasury Bill Index | - |
| N° of holdings | 36 | 93 |
| Asset class | - | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | October 8, 2025 | September 27, 2023 |
| ESG | No | No |
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Exposure
Countries
SPTU
USA
89.55%
Other
10.45%
BAMU
USA
98.9%
Other
1.1%
Sectors
SPTU
Sovereign
89.55%
Other
10.45%
BAMU
Sovereign
95.3%
Other
4.7%
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Diversification
SPTU
Total weight of top 15 holdings out of 15
59.84%
BAMU
Total weight of top 15 holdings out of 15
39.58%
Top 15 holdings
Data as of August 31, 2026
SPTU
USA, Bills 0% 1oct2026, USD (364D)
6.90%
USA, Bills 0% 8oct2026, USD (182D)
5.78%
USA, Bills 0% 27nov2026, USD (364D)
4.66%
USA, Bills 0% 29oct2026, USD (364D)
4.54%
USA, Bills 0% 13oct2026, USD (119D)
3.79%
USA, Bills 0% 5nov2026, USD (182D)
3.78%
USA, Bills 0% 12nov2026, USD (182D)
3.78%
USA, Bills 0% 19nov2026, USD (182D)
3.78%
USA, Bills 0% 20oct2026, USD (119D)
3.71%
USA, Bills 0% 6oct2026, USD (119D)
3.61%
USA, Bills 0% 15oct2026, USD (182D)
3.43%
USA, Bills 0% 22oct2026, USD (182D)
3.43%
USA, Bills 0% 24dec2026, USD (363D)
3.42%
USA, Bills 0% 18feb2027, USD (364D)
2.73%
USA, Bills 0% 21jan2027, USD (364D)
2.51%
BAMU
BlackRock Cash Funds - Treasury
3.61%
USA, Bills 0% 20oct2026, USD (119D)
3.57%
USA, Bills 0% 13oct2026, USD (119D)
3.29%
USA, Bills 0% 29oct2026, USD (364D)
3.18%
USA, Bills 0% 27oct2026, USD (119D)
2.65%
USA, Bills 0% 8oct2026, USD (182D)
2.56%
USA, Bills 0% 15oct2026, USD (182D)
2.45%
USA, Bills 0% 27nov2026, USD (364D)
2.43%
USA, Notes 3.5% 30sep2026, USD (BH-2026)
2.39%
USA, Bills 0% 22oct2026, USD (182D)
2.35%
USA, Bills 0% 5nov2026, USD (182D)
2.33%
USA, Bills 0% 19nov2026, USD (182D)
2.31%
USA, Bills 0% 6oct2026, USD (119D)
2.28%
USA, Notes 4.125% 31oct2026, USD (BJ-2026)
2.12%
USA, Notes 0.875% 30sep2026, USD (AD-2026)
2.07%
Frequently asked questions about SPTU and BAMU
How have the SPTU and BAMU ETFs performed in 2026?
As of October 16, 2026, SPTU is up 2.86% year-to-date (YTD), while BAMU has returned 2.06%. That puts SPTU better performer ahead so far this year.
Which ETF is attracting more investor money: SPTU or BAMU?
Year-to-date, the SPTU ETF saw +$6M in flows, compared to -$6M for BAMU.
Which ETF is more volatile: SPTU or BAMU?
Over the past year, SPTU had a volatility of 0.16%, while BAMU experienced 0.3%.
Which ETF is bigger: SPTU or BAMU?
As of October 16, 2026, SPTU holds $16.78 M in assets under management (AUM), while BAMU manages $65.68 M.
What sectors do the SPTU and BAMU ETFs invest in?
SPTU leans toward sectors like Sovereign. Meanwhile, BAMU focuses on Sovereign.
What are the top holdings of the SPTU ETF and BAMU ETF?
SPTU top holdings include USA, Bills 0% 1oct2026, USD (364D), USA, Bills 0% 8oct2026, USD (182D) and USA, Bills 0% 27nov2026, USD (364D). BAMU holds in its top three: BlackRock Cash Funds - Treasury, USA, Bills 0% 20oct2026, USD (119D) and USA, Bills 0% 13oct2026, USD (119D).
Which ETF is more diversified: SPTU or BAMU?
SPTU holds 41 securities with 59.84% of its assets in the top 15. BAMU has 98 securities and a top 15 weight of 39.58%.
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