The fund tracks an index of US dollar-denominated Treasuries, government-related bonds and investment-grade corporate bonds with remaining maturities of one to ten years. It blends the stability of a Treasury-focused portfolio with the extra yield of corporate bonds in a single product.

It suits investors with a moderate profile who find the rate swings of long-term bonds uncomfortable but want more interest income than short-term bonds provide.

It is a passively managed (index-tracking) ETF run by BlackRock iShares.

The fund holds the Treasuries, government-related bonds and investment-grade corporate bonds included in the index, roughly in line with market-capitalization weighting. Limiting maturities to the intermediate range keeps duration under control, and bonds that mature are replaced with newly issued securities when the index is reconstituted.

• A blended structure that holds Treasuries and investment-grade corporate bonds in one product
• Duration kept in check by the intermediate-maturity limit
• Monthly distributions mean a shorter cash flow cycle

Assets under management (AUM) stand at $3.9B, and the total expense ratio is 0.20% per year.

With bond ETFs, differences in fees accumulate directly in long-term returns. It is also wise to check liquidity and bid-ask spreads.

The fund has repeatedly followed a pattern in which bond prices come under pressure when rates rise and rebound when rates fall. Because it sits in the intermediate range, its price swings tend to be smaller than those of long-term bonds.

Each time expectations for the direction of policy rates change, money flows into and out of bond ETFs across the board. Products that mix Treasuries and corporate bonds react relatively more sensitively when credit spreads widen.

By holding Treasuries and investment-grade corporate bonds together, the fund aims for a balance between stability and interest income, but investors should keep in mind that it is exposed to both interest rates and credit spreads.

Products shown in the table such as BIV ETF and IMTB are replacement candidates that offer similar intermediate bond exposure at lower fees, while UITB ETF covers the same intermediate range but mixes in active management, which costs more. In terms of assets under management, BIV is far larger, and this ETF falls in the mid-sized group. If you want to hold only Treasuries, compare it with IEI and similar funds; to raise the corporate bond weighting, with IGIB and similar funds; and to shorten maturities further, with IGSB and similar funds.

Bond ETFs call for a different checklist than stocks. Checking four things first makes the decision easier: maturity range, credit composition, distribution frequency and cost. Before adding this ETF, please go through the four items below in order.

If interest rates move against expectations, valuation losses can outweigh interest income. In a weakening economy, credit risk in the corporate bond portion also rises.

It is a reasonable choice for investors who want to set their bond allocation at intermediate maturities. To save more on costs, compare BIV ETF or IMTB and others, and to hold only Treasuries, compare IEI and others before deciding.