What this ETF is trying to do

The iShares MBS ETF (MBB) is an exchange-traded fund. While the provided data does not list specific holdings, its name indicates it focuses on Mortgage-Backed Securities (MBS). These are types of investments backed by loans used to buy homes.

What the numbers show

As of October 9, 2026, the share price is $89.79. To understand how the price has changed, we can look at the price return and the total return.

• Price Return: This measures only the change in the share price. The one-year price return is -5.40%, and the year-to-date (YTD) price return is -5.70%.

• Total Return: This reflects the overall return, including distributions. The one-year total return is -1.23%, and the YTD total return is -2.59%.

Over a longer period, the three-year price return is 1.69%, while the three-year total return is 15.01%.

For a simple example, if you had invested $10,000 based on the estimated price from roughly one year ago ($94.92), and the price dropped to the current $89.79, your investment's value based on price alone would have decreased.

Income and distribution explanation

This ETF usually pays distributions monthly. Over the last 12 months, it has made 12 payouts totaling $4.07 per share. This results in a distribution yield of approximately 4.53%.

It is important for beginners to know that a high distribution yield alone can be misleading. A fund can pay out cash to investors even while its share price is falling.

NAV erosion explanation

"NAV erosion" happens when the underlying value of a fund's assets declines over time. StockValueFinder uses an erosion-risk score to measure this. MBB has an erosion score of 75, which is labeled as "mild price erosion." This is a measurement of risk rather than proof that the fund's value has collapsed. The severe erosion-risk flag is currently false.

Pros

• Regular Income: The fund provides monthly cash distributions.

• Long-term Total Return: The three-year total return is positive at 15.01%.

Cons

• Recent Price Decline: Both the YTD and one-year price returns are negative.

• Mild Erosion Risk: The fund has a "mild" erosion-risk label.

Beginner takeaway

Income investors often care about "principal stability," which means they want their original investment to keep its value while they collect payouts. In this case, the total return (which includes payouts) is higher than the price return (which is just the share price). This shows that the distributions helped offset some of the share-price decline over the last year.