Index
Funds that track the Bloomberg U.S. MBS
3 UK-listed funds Fundology covers track the Bloomberg U.S. MBS. Ongoing charges run from 0.28% (IMBA and SMBS) to 0.30% a year, as of 09/10/2026.
At a glance
- Funds
- 3
- Providers
- 1
- Ongoing charges
- 0.28% to 0.30%
- Accumulating · distributing
- 1 · 2
The lowest ongoing charge among the 3 Bloomberg U.S. MBS funds Fundology tracks is 0.28% a year (IMBA and SMBS), as of 09/10/2026. A lower charge does not guarantee a better return.
1 accumulate their income and 2 pay it out; 1 is a currency-hedged share class. Each fund is listed once, by one share class; its other share classes are on its own page.
By fund size, the 3 largest are IMBA (£1.6bn), SMBS (£431m) and IMGP (£136m), as reported on 09/10/2026. Size shows how widely a fund is held, not how it will perform.
All are funds from iShares (3).
Terms:Index fundsOngoing charges figureTracking differenceAccumulating or incomeCurrency hedging
Past returns, side by side
Over the five years to 09/10/2026, total returns with income reinvested ranged from +0.1% (SMBS) to +0.3% (IMBA); the median of 2 funds was +0.2%.
Over the three years to 09/10/2026, total returns with income reinvested ranged from +4.7% (IMGP) to +6.1% (SMBS); the median of 3 funds was +5.2%.
Over the year to 09/10/2026, total returns with income reinvested ranged from −1.8% (IMGP) to −0.5% (SMBS); the median of 3 funds was −0.6%.
| Period | Funds | Lowest | Median | Highest |
|---|---|---|---|---|
| 1 yearIncome reinvested · to | 3 | −1.8% IMGP | −0.6% | −0.5% SMBS |
| 3 yearsIncome reinvested · to | 3 | +4.7% IMGP | +5.2% | +6.1% SMBS |
| 5 yearsIncome reinvested · to | 2 | +0.1% SMBS | +0.2% | +0.3% IMBA |
Source: TradingView reported returns, and Fundology’s own from daily closes where none is reported, as of
How we work it out:ReturnsReturns after inflationTotal return
Funds that track the Bloomberg U.S. MBS (3)
All 3 funds that track the Bloomberg U.S. MBS, one share class each, listed by name. An order is not a ranking of quality.
| Fund | Charge | Size | 1 year | 3 years | 5 years | 5 years after inflation |
|---|---|---|---|---|---|---|
| IMBA iShares US Mortgage Backed Securities UCITS ETF AccAccumulating | 0.28% | £1.6bn | −0.6% | +5.2% | +0.3% | −21.6% |
| IMGP iShares US Mortgage Backed Securities UCITS ETF Hedged GBPDistributing · Hedged to GBP | 0.30% | £136m | −1.8% | +4.7% | Not reported | Not reported |
| SMBS iShares US Mortgage Backed Securities UCITS ETF USDDistributing | 0.28% | £431m | −0.5% | +6.1% | +0.1% | −21.8% |
Source: TradingView (returns, size and most charges), fund issuers (some charges), ONS CPIH (inflation), as of , at least 15 min delayed
Questions people ask
How many UK funds track the Bloomberg U.S. MBS?
3 UK-listed funds Fundology covers track the Bloomberg U.S. MBS, as of 09/10/2026. 1 accumulate their income and 2 pay it out; 1 is a currency-hedged share class. All are iShares funds. Each fund is listed once, by one share class; its other share classes are on its own page.
Which Bloomberg U.S. MBS fund has the lowest ongoing charge?
The lowest ongoing charge among the 3 Bloomberg U.S. MBS funds Fundology tracks is 0.28% a year (IMBA and SMBS), as of 09/10/2026. A lower charge does not guarantee a better return.
What is the largest Bloomberg U.S. MBS fund in the UK?
By fund size, IMBA (iShares US Mortgage Backed Securities UCITS ETF Acc) is the largest of the 3 funds here, at £1.6bn as reported on 09/10/2026. Size shows how widely a fund is held, not how it will perform.
What is the difference between the accumulating and distributing versions?
An accumulating share class reinvests the income from its holdings inside the fund, so it shows up as a rising price; a distributing class pays it out to holders as cash, usually a few times a year. Of the 3 Bloomberg U.S. MBS funds here, 1 accumulate and 2 distribute.
How is this list ordered?
Listed by name unless ordered by ongoing charge. No order on this page is a ranking or a recommendation.