MBBA vs VMBS
iShares Mortgage-Backed Securities Active ETF against Vanguard Mortgage-Backed Securities ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
3%
48 shared positions
Fee gap
22 bp
VMBS is cheaper
1-year return gap
—
Larger fund
VMBS
$15.7B
Side by side
| MBBA | VMBS | |
|---|---|---|
| Fund | iShares Mortgage-Backed Securities Active ETF | Vanguard Mortgage-Backed Securities ETF |
| Issuer | iShares | Vanguard |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.25% | 0.03% |
| Assets | $730M | $15.7B |
| Average daily dollar volume | $23M | $121M |
| Listed | May 18, 1998 | Nov 19, 2009 |
| FrenzyCap score | 66 | 99 |
| 1-month return | −1.1% | −1.1% |
| 3-month return | −2.7% | −2.6% |
| Year to date | — | −4.7% |
| 1-year return | — | −5.2% |
| 30-day volatility | 7.5% | 6.2% |
| Worst drawdown, 1 year | −8.5% | −7.7% |
| Trailing 12-month yield | 3.26% | 4.38% |
| Holdings | 710 | 4,939 |
| Top 10 weight | 46.4% | 2.7% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$31M thru Jul 2026 | +$460M thru May 2026 |
| 30-day implied volatility | — | 7.6% |
| Holdings as of | as of Oct 20, 2026issuer data | as of Sep 30, 2026issuer data |
Returns are price returns and exclude distributions. Flows are each fund's own latest reported months and may not cover the same period.
Largest shared holdings
28% of MBBA · 4% of VMBS| Holding | MBBA | VMBS |
|---|---|---|
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 1.33% | 0.28% |
| FHLMC 30YR UMBS, due May 1, 2056 | 1.01% | 0.24% |
| GNMA2 30YR, due Dec 20, 2055 | 0.37% | 0.20% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 6.18% | 0.18% |
| FNMA 30YR UMBS, due Apr 1, 2051 | 0.23% | 0.16% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 0.42% | 0.16% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2051 | 0.85% | 0.15% |
| GNMA2 30YR, due Jul 20, 2051 | 2.07% | 0.15% |
| GNMA2 30YR, due Dec 20, 2051 | 0.54% | 0.13% |
| FHLMC 30YR UMBS SUPER, due May 1, 2052 | 0.53% | 0.12% |
| GNMA2 30YR TBA, due Nov 19, 2026 | 1.43% | 0.11% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2053 | 0.11% | 0.13% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2054 | 0.10% | 0.14% |
| FNMA 30YR UMBS, due Jul 1, 2051 | 0.16% | 0.10% |
| FNMA 30YR UMBS, due May 1, 2056 | 1.85% | 0.09% |
| FNMA 30YR UMBS, due Apr 1, 2051 | 0.16% | 0.08% |
| FHLMC 30YR UMBS SUPER, due Jan 1, 2053 | 0.14% | 0.07% |
| FHLMC 30YR UMBS SUPER, due Apr 1, 2051 | 0.28% | 0.06% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 1.26% | 0.06% |
| FHLMC 30YR UMBS, due Feb 1, 2056 | 0.09% | 0.05% |
| GNMA2 30YR, due May 20, 2055 | 0.05% | 0.07% |
| FHLMC 30YR UMBS SUPER, due Jun 1, 2053 | 0.05% | 0.05% |
| FNMA 30YR UMBS, due Sep 1, 2052 | 0.17% | 0.05% |
| FHLMC 30YR UMBS SUPER, due Oct 1, 2052 | 0.05% | 0.06% |
| FNMA 30YR UMBS, due Oct 1, 2052 | 0.04% | 0.08% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · MBBA 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.