FLDBvsMFSBETF Comparison
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Fidelity Low Duration Bond ETF (FLDB) belongs to the Money Market Bonds segment. MFS Active Core Plus Bond ETF (MFSB) is part of the US Aggregate Bonds segment. FLDB's top 3 sector exposures are Finance, Sovereign and Industrials. In contrast, MFSB's top sector exposures are Sovereign, Finance and Industrials. FLDB is less expensive with a Total Expense Ratio (TER) of 0.2%, versus 0.34% for MFSB. FLDB is up 2.74% year-to-date (YTD) with +$52M in YTD flows. MFSB performs worse with -1.38% YTD performance, and +$583M in YTD flows. Run a side-by-side ETF comparison of FLDB and MFSB 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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FLDB vs MFSB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/19/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | FLDB MFSB | +0.30%-1.00% | +0.82%-1.92% | +2.74%-1.38% | +3.58%-1.38% | n/an/a | n/an/a |
| Flows | FLDB MFSB | +$19M+$151M | +$30M+$244M | +$52M+$583M | +$58M+$630M | -- | -- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | FLDB MFSB | +0.37%+4.02% | +0.34%+3.52% | n/an/a | n/an/a |
| Max drawdown | FLDB MFSB | -0.07%-3.18% | -0.08%-4.09% | n/an/a | n/an/a |
| Max drawdown duration | FLDB MFSB | 12d55d | 17d232d | n/an/a | n/an/a |
Trading data
FLDB | MFSB | |
Last sale 10/20/2026 at 1:30 PM | $50.23 | $24.03 |
| Previous close 10/19/2026 | $50.26 | $23.99 |
| Consolidated volume 10/19/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
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Main metrics
Last update 10/20/2026 at 1:30 PM
Live
Closed
FLDB | MFSB | |
|---|---|---|
| Last price | $50.23 | $24.03 |
| 1D performance | -0.06% | +0.19% |
| AuM | $440.64 M | $718.86 M |
| E/R | 0.2% | 0.34% |
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Exposure
Countries
FLDB
USA
55.1%
Other
44.9%
MFSB
USA
57.49%
Other
42.51%
Sectors
FLDB
Finance
35.38%
Sovereign
27.26%
Other
37.36%
MFSB
Sovereign
27.4%
Finance
19.95%
Industrials
8.05%
Other
44.6%
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Diversification
FLDB
Total weight of top 15 holdings out of 15
34.42%
MFSB
Total weight of top 15 holdings out of 15
27.94%
Top 15 holdings
Data as of August 31, 2026
FLDB
USA, Notes 4.125% 31jan2027, USD (AW-2027)
8.56%
USA, Notes 3.625% 31aug2027, USD (BG-2027)
7.11%
USA, Notes 3.375% 31dec2027, USD (BM-2027)
5.96%
USA, Notes 3.75% 30apr2028, USD (BA-2028)
4.08%
US31635A1051
3.87%
USA, Notes 3.5% 30sep2026, USD (BH-2026)
1.55%
Goldman Sachs, 1.948% 21oct2027, USD
0.38%
JP Morgan, 6.07% 22oct2027, USD
0.38%
US33884EAQ44
0.37%
Mitsubishi UFJ Financial Group, 5.017% 20jul2028, USD
0.36%
US64134VAY20
0.36%
Toronto-Dominion Bank, 4.568% 17dec2026, USD (C)
0.36%
HSBC Holdings plc, 2.251% 22nov2027, USD
0.36%
U.S. Bancorp, 6.787% 26oct2027, USD (CC)
0.36%
U.S. Bank N.A., FRN 15may2028, USD
0.36%
MFSB
USA, Bonds 4.625% 15nov2045, USD
9.13%
USA, Notes 3.875% 31jul2030, USD (AB-2030)
4.69%
USA, Bonds 4.625% 15nov2055, USD
3.92%
USA, Notes 4.125% 31oct2029, USD (AF-2029)
2.46%
US01F0306948
0.97%
USA, Bonds 4.625% 15nov2044, USD
0.92%
USA, Bonds 4.875% 15aug2045, USD
0.89%
USA, Bonds 4.5% 15nov2054, USD
0.88%
Boston Properties LP, 5.75% 15jan2035, USD
0.66%
Bank of America Corporation, 5.744% 12feb2036, USD (N)
0.61%
Highwoods Realty, 5.35% 15jan2033, USD
0.61%
Jefferies Financial Group, 5.5% 15feb2036, USD
0.57%
Corebridge Financial, 5.75% 15jan2034, USD
0.56%
US12570XAQ51
0.55%
USA, Bonds 4.25% 15feb2054, USD
0.54%
Frequently asked questions about FLDB and MFSB
How have the FLDB and MFSB ETFs performed in 2026?
As of October 19, 2026, FLDB is up 2.74% year-to-date (YTD), while MFSB has lost -1.38%. That puts FLDB better performer ahead so far this year.
Which ETF is attracting more investor money: FLDB or MFSB?
Year-to-date, the FLDB ETF saw +$52M in flows, compared to +$583M for MFSB.
Which ETF is more volatile: FLDB or MFSB?
Over the past year, FLDB had a volatility of 0.34%, while MFSB experienced 3.52%.
Which ETF is bigger: FLDB or MFSB?
As of October 19, 2026, FLDB holds $440.64 M in assets under management (AUM), while MFSB manages $718.86 M.
What sectors do the FLDB and MFSB ETFs invest in?
FLDB leans toward sectors like Finance and Sovereign. Meanwhile, MFSB focuses on Sovereign, Finance and Industrials.
What are the top holdings of the FLDB ETF and MFSB ETF?
FLDB top holdings include USA, Notes 4.125% 31jan2027, USD (AW-2027), USA, Notes 3.625% 31aug2027, USD (BG-2027) and USA, Notes 3.375% 31dec2027, USD (BM-2027). MFSB holds in its top three: USA, Bonds 4.625% 15nov2045, USD, USA, Notes 3.875% 31jul2030, USD (AB-2030) and USA, Bonds 4.625% 15nov2055, USD.
Which ETF is more diversified: FLDB or MFSB?
FLDB holds 369 securities with 34.42% of its assets in the top 15. MFSB has 463 securities and a top 15 weight of 27.94%.
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Latest news about FLDB & MFSB
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