MFSBvsIMTBETF Comparison
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MFS Active Core Plus Bond ETF (MFSB) and iShares Core 5-10 Year USD Bond ETF (IMTB) belong to the same industry segment: US Aggregate Bonds. MFSB's top 3 sector exposures are Sovereign, Finance and Industrials. In contrast, IMTB's top sector exposures are Sovereign, Industrials and Non-Corporate. MFSB is more expensive with a Total Expense Ratio (TER) of 0.34%, versus 0.07% for IMTB. MFSB is down -0.77% year-to-date (YTD) with +$432M in YTD flows. IMTB performs worse with -1.72% YTD performance, and +$4M in YTD flows. Run a side-by-side ETF comparison of MFSB and IMTB 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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MFSB vs IMTB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/16/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | MFSB IMTB | -0.95%-1.68% | -1.91%-2.60% | -0.77%-1.72% | -0.12%-0.91% | n/a+14.66% | n/a-0.31% |
| Flows | MFSB IMTB | +$45M- | +$134M- | +$432M+$4M | +$507M+$26M | -+$84M | -+$163M |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | MFSB IMTB | +3.44%+4.25% | +3.32%+3.93% | n/a+5.39% | n/a+6.20% |
| Max drawdown | MFSB IMTB | -2.27%-2.92% | -2.57%-3.59% | n/a-5.03% | n/a-17.95% |
| Max drawdown duration | MFSB IMTB | 79d79d | 199d199d | n/a280d | n/a1444d |
Trading data
MFSB | IMTB | |
Last sale 9/16/2026 at 1:30 PM | $24.26 | $42.06 |
| Previous close 09/16/2026 | $24.23 | $42.09 |
| Consolidated volume 09/16/2026 | ||
| 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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MFSB
is actively managed and doesn’t replicate an indexMFSB | IMTB | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/16/2026 at 1:30 PM
Live
Closed
MFSB | IMTB | |
|---|---|---|
| Last price | $24.26 | $42.06 |
| 1D performance | +0.12% | -0.05% |
| AuM | $573.83 M | $269.17 M |
| E/R | 0.34% | 0.07% |
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Exposure
Countries
MFSB
USA
57.02%
Other
42.98%
IMTB
USA
63.31%
Other
36.69%
Sectors
MFSB
Sovereign
26.57%
Finance
20.22%
Industrials
8.04%
Other
45.17%
IMTB
Sovereign
24.95%
Industrials
13.03%
Non-Corporate
10.19%
Finance
10.09%
Other
41.75%
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Diversification
MFSB
Total weight of top 15 holdings out of 15
27.06%
IMTB
Total weight of top 15 holdings out of 15
23.24%
Top 15 holdings
Data as of July 31, 2026
MFSB
USA, Bonds 4.625% 15nov2045, USD
8.86%
USA, Bonds 4.625% 15nov2055, USD
4.10%
USA, Notes 3.875% 31jul2030, USD (AB-2030)
4.06%
USA, Notes 4.125% 31oct2029, USD (AF-2029)
2.59%
USA, Bonds 4.625% 15nov2044, USD
0.96%
USA, Bonds 4.875% 15aug2045, USD
0.93%
USA, Bonds 4.5% 15nov2054, USD
0.92%
Boston Properties LP, 5.75% 15jan2035, USD
0.69%
Bank of America Corporation, 5.744% 12feb2036, USD (N)
0.64%
US01F0306864
0.59%
US12570XAQ51
0.57%
USA, Bonds 4.25% 15feb2054, USD
0.56%
Highwoods Realty, 5.35% 15jan2033, USD
0.54%
Boeing, 6.528% 1may2034, USD
0.53%
JP Morgan, 4.946% 22oct2035, USD
0.52%
IMTB
BlackRock Cash Funds - Institutional
10.15%
USA, Notes 4.375% 15may2034, USD (C-2034)
1.19%
USA, Notes 4.25% 15aug2035, USD (E-2035)
1.16%
USA, Notes 4% 15nov2035, USD (F-2035)
1.11%
USA, Notes 4.625% 15feb2035, USD (B-2035)
1.03%
US01F0206874
0.93%
USA, Notes 2.875% 15may2032, USD (C-2032)
0.92%
USA, Notes 3.875% 15aug2034, USD (E-2034)
0.91%
USA, Notes 4% 15feb2034, USD (B-2034)
0.86%
USA, Notes 1.25% 15aug2031, USD (E-2031)
0.85%
US31418EDB39
0.85%
USA, Notes 4.125% 15feb2036, USD (B-2036)
0.82%
US3140XLFE34
0.82%
USA, Notes 4.5% 15nov2033, USD (F-2033)
0.82%
USA, Notes 4.25% 15nov2034, USD (F-2034)
0.82%
Frequently asked questions about MFSB and IMTB
How have the MFSB and IMTB ETFs performed in 2026?
As of September 16, 2026, MFSB is down -0.77% year-to-date (YTD), while IMTB has lost -1.72%. That puts MFSB better performer ahead so far this year.
Which ETF is attracting more investor money: MFSB or IMTB?
Year-to-date, the MFSB ETF saw +$432M in flows, compared to +$4M for IMTB.
Which ETF is more volatile: MFSB or IMTB?
Over the past year, MFSB had a volatility of 3.32%, while IMTB experienced 3.93%.
Which ETF is bigger: MFSB or IMTB?
As of September 16, 2026, MFSB holds $573.83 M in assets under management (AUM), while IMTB manages $269.17 M.
What sectors do the MFSB and IMTB ETFs invest in?
MFSB leans toward sectors like Sovereign, Finance and Industrials. Meanwhile, IMTB focuses on Sovereign, Industrials and Non-Corporate.
What are the top holdings of the MFSB ETF and IMTB ETF?
MFSB top holdings include USA, Bonds 4.625% 15nov2045, USD, USA, Bonds 4.625% 15nov2055, USD and USA, Notes 3.875% 31jul2030, USD (AB-2030). IMTB holds in its top three: BlackRock Cash Funds - Institutional, USA, Notes 4.375% 15may2034, USD (C-2034) and USA, Notes 4.25% 15aug2035, USD (E-2035).
Which ETF is more diversified: MFSB or IMTB?
MFSB holds 457 securities with 27.06% of its assets in the top 15. IMTB has 3452 securities and a top 15 weight of 23.24%.
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Latest news about MFSB & IMTB
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