MBB vs VMBS
iShares MBS ETF against Vanguard Mortgage-Backed Securities ETF: cost, size, returns, what they hold and how much of it is the same.
Fee gap
1 bp
VMBS is cheaper
1-year return gap
0.4 pts
VMBS is ahead
Larger fund
MBB
$35.6B
Side by side
| MBB | VMBS | |
|---|---|---|
| Fund | iShares MBS ETF | Vanguard Mortgage-Backed Securities ETF |
| Issuer | iShares | Vanguard |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.04% | 0.03% |
| Assets | $35.6B | $15.4B |
| Average daily dollar volume | $591M | $108M |
| Listed | Mar 13, 2007 | Nov 19, 2009 |
| FrenzyCap score | 98 | 99 |
| 1-month return | −1.8% | −1.9% |
| 3-month return | −3.7% | −3.7% |
| Year to date | −5.7% | −5.4% |
| 1-year return | −5.6% | −5.2% |
| 30-day volatility | 6.6% | 6.0% |
| Worst drawdown, 1 year | −8.1% | −7.7% |
| Trailing 12-month yield | 4.53% | 4.42% |
| Holdings | 10,858 | 5,123 |
| Top 10 weight | 6.0% | 3.2% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | −$179M thru May 2026 | +$460M thru May 2026 |
| 30-day implied volatility | 7.7% | 8.0% |
| Holdings as of | as of Oct 8, 2026issuer data | as of May 31, 2026SEC filing |
Returns are price returns and exclude distributions. Flows are each fund's own latest reported months and may not cover the same period.
More: full overlap table · MBB holdings · VMBS holdings
Fund data comes from each fund's SEC filings and issuer disclosures and is shown with the date it is as of. SEC portfolio and flow filings become public about 60 days after the period they cover. Nothing here is investment advice; see Terms.