# iShares MBS ETF (MBB) — Overview

MBB · NASDAQ · Fund

Canonical page: https://www.lighthorse.io/tickers/mbb

## Price

Last close $90.59 on Oct 15, 2026. 52-week range $89.09 – $96.91.

## Fund profile

MBB tracks a market-weighted index of investment-grade mortgage pass-through securities. The index includes fixed and floating rate securities issued by GNMA, FNMA and FHLMC.

| Metric | Value |
| --- | --- |
| Issuer | BlackRock Fund Advisors |
| Industry | — |
| Inception | Mar 13, 2007 |
| Assets under management | $35.8B |
| Expense ratio | 0.04% |
| Net asset value | $90.06 (as of Oct 13, 2026) |
| Distributions | Monthly |
| Leverage | 1x |

## Frequently Asked Questions

### What is iShares MBS ETF (MBB)?

MBB tracks a market-weighted index of investment-grade mortgage pass-through securities. The index includes fixed and floating rate securities issued by GNMA, FNMA and FHLMC.

### What is MBB's expense ratio?

iShares MBS ETF charges an annual expense ratio of 0.04%. The fund is issued by BlackRock Fund Advisors.

### How large is MBB?

iShares MBS ETF manages $35.8B in assets and has traded since Mar 13, 2007.

### How do I buy shares of iShares MBS ETF (MBB)?

MBB trades commission-free with a Light Horse Securities brokerage account — from the mobile app, the web at [Light Horse Dashboard](https://portal.lighthorse.io), the trading API, or an [AI agent connected over MCP](/instructions/ai/claude). The trade panel on this page places the order once you are signed in.

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Quotes and charts are not real-time and must not be relied on for trade decisions or valuation.

This page is for informational purposes only. Nothing on it is a recommendation, solicitation or offer to buy or sell any security, nor investment, legal or tax advice. Light Horse Securities Inc does not verify third-party data and is not responsible for its accuracy, completeness or timeliness.

Data provided by [AInvest](https://www.ainvest.com).