ULSTvsBUCKETF Comparison
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State Street SPDR Ultra Short Term Bond ETF (ULST) belongs to the Money Market Bonds segment. Simplify Stable Income ETF (BUCK) is part of the Multi-Asset: Other segment. ULST's top 3 sector exposures are Sovereign, Finance and Industrials. In contrast, BUCK's top sector exposures are Government Agencies and Sovereign. ULST is less expensive with a Total Expense Ratio (TER) of 0.2%, versus 0.35% for BUCK. ULST is up 2.06% year-to-date (YTD) with -$105M in YTD flows. BUCK performs better with 2.92% YTD performance, and +$165M in YTD flows. Run a side-by-side ETF comparison of ULST and BUCK 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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ULST vs BUCK performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/18/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | ULST BUCK | +0.07%+0.24% | +0.71%+0.98% | +2.06%+2.92% | +3.13%+4.66% | +14.87%+15.76% | +19.67%n/a |
| Flows | ULST BUCK | -$7M+$14M | -$22M+$49M | -$105M+$165M | -$112M+$167M | -$55M+$518M | +$75M- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | ULST BUCK | +0.42%+0.56% | +0.49%+0.98% | +0.63%+2.83% | +0.59%n/a |
| Max drawdown | ULST BUCK | -0.10%-0.15% | -0.24%-0.42% | -0.26%-5.11% | -1.12%n/a |
| Max drawdown duration | ULST BUCK | 10d5d | 31d17d | 10d160d | 410dn/a |
Trading data
ULST | BUCK | |
Last sale 9/21/2026 at 1:30 PM | $40.29 | $23.39 |
| Previous close 09/18/2026 | $40.27 | $23.41 |
| Consolidated volume 09/18/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
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Main metrics
Last update 9/21/2026 at 1:30 PM
Live
Closed
ULST | BUCK | |
|---|---|---|
| Last price | $40.29 | $23.39 |
| 1D performance | +0.05% | -0.09% |
| AuM | $514.32 M | $509.89 M |
| E/R | 0.2% | 0.35% |
Characteristics
ULST | BUCK | |
|---|---|---|
| Management strategy | Active | Active |
| Provider | State Street Investment Management | Simplify |
| Benchmark | - | - |
| N° of holdings | 298 | 125 |
| Asset class | - | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | September 10, 2013 | October 27, 2022 |
| ESG | No | No |
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Exposure
Countries
ULST
USA
75.07%
Other
24.93%
BUCK
USA
70.92%
Other
29.08%
Sectors
ULST
Sovereign
33.27%
Finance
30.68%
Other
36.05%
BUCK
Government Agenci.
46.12%
Sovereign
24.81%
Other
29.08%
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Diversification
ULST
Total weight of top 15 holdings out of 15
47.77%
BUCK
Total weight of top 15 holdings out of 15
25.17%
Top 15 holdings
Data as of July 31, 2026
ULST
USA, Notes 4.125% 28feb2027, USD (AY-2027)
12.28%
USA, Bills 0% 1sep2026, USD (119D)
9.45%
USA, Bills 0% 15sep2026, USD (119D)
4.72%
USA, Notes 3.625% 31aug2027, USD (BG-2027)
3.44%
USA, Notes 4% 30jun2028, USD (AA-2028)
3.27%
Athene Global Funding, 2.95% 12nov2026, USD
2.69%
Toronto-Dominion Bank, 4.568% 17dec2026, USD (C)
1.88%
Athene Global Funding, 4.83% 9may2028, USD (2025-13)
1.51%
Truist Bank, 3.8% 30oct2026, USD (J)
1.50%
Microsoft, 3.4% 15sep2026, USD
1.37%
Chevron Phillips Chemical, 3.4% 1dec2026, USD
1.26%
Charles Schwab, 5.875% 24aug2026, USD
1.16%
Morgan Stanley, 5.652% 13apr2028, USD (I)
1.15%
Carnival Corp, 4% 1aug2028, USD
1.11%
Huntington National Bank, 5.65% 10jan2030, USD
0.97%
BUCK
Freddie Mac, FRN 22sep2027, USD
2.92%
USA, Notes FRN 31jul2026, USD (BF-2026)
2.53%
USA, Notes FRN 31jul2027, USD (BF-2027)
2.03%
FHLB, 0% 7aug2026, USD (365D)
2.02%
FHLB, 0% 21aug2026, USD (365D)
2.02%
FHLB, 0% 27aug2026, USD (365D)
2.02%
FHLB, 0% 3sep2026, USD (365D)
1.61%
USA, Notes FRN 31oct2027, USD (BK-2027)
1.42%
FHLB, 0% 28aug2026, USD (365D)
1.41%
USA, Bills 0% 8oct2026, USD (182D)
1.41%
USA, Notes FRN 30apr2027, USD (BB-2027)
1.28%
US313313F450
1.21%
US313589C353
1.13%
US313589B447
1.09%
FHLB, 0% 31jul2026, USD (365D)
1.07%
Frequently asked questions about ULST and BUCK
How have the ULST and BUCK ETFs performed in 2026?
As of September 18, 2026, ULST is up 2.06% year-to-date (YTD), while BUCK has returned 2.92%. That puts BUCK better performer ahead so far this year.
Which ETF is attracting more investor money: ULST or BUCK?
Year-to-date, the ULST ETF saw -$105M in flows, compared to +$165M for BUCK.
Which ETF is more volatile: ULST or BUCK?
Over the past year, ULST had a volatility of 0.49%, while BUCK experienced 0.98%.
Which ETF is bigger: ULST or BUCK?
As of September 18, 2026, ULST holds $514.32 M in assets under management (AUM), while BUCK manages $509.89 M.
What sectors do the ULST and BUCK ETFs invest in?
ULST leans toward sectors like Sovereign and Finance. Meanwhile, BUCK focuses on Government Agencies and Sovereign.
What are the top holdings of the ULST ETF and BUCK ETF?
ULST top holdings include USA, Notes 4.125% 28feb2027, USD (AY-2027), USA, Bills 0% 1sep2026, USD (119D) and USA, Bills 0% 15sep2026, USD (119D). BUCK holds in its top three: Freddie Mac, FRN 22sep2027, USD, USA, Notes FRN 31jul2026, USD (BF-2026) and USA, Notes FRN 31jul2027, USD (BF-2027).
Which ETF is more diversified: ULST or BUCK?
ULST holds 303 securities with 47.77% of its assets in the top 15. BUCK has 167 securities and a top 15 weight of 25.17%.
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