MBBA vs SPMB
iShares Mortgage-Backed Securities Active ETF against State Street SPDR Portfolio Mortgage Backed Bond ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
6%
47 shared positions
Fee gap
21 bp
SPMB is cheaper
1-year return gap
—
Larger fund
SPMB
$6.9B
Side by side
| MBBA | SPMB | |
|---|---|---|
| Fund | iShares Mortgage-Backed Securities Active ETF | State Street SPDR Portfolio Mortgage Backed Bond ETF |
| Issuer | iShares | State Street SPDR |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.25% | 0.04% |
| Assets | $730M | $6.9B |
| Average daily dollar volume | $23M | $51M |
| Listed | May 18, 1998 | Jan 15, 2009 |
| FrenzyCap score | 66 | 95 |
| 1-month return | −1.1% | −1.1% |
| 3-month return | −2.7% | −2.6% |
| Year to date | — | −4.7% |
| 1-year return | — | −5.7% |
| 30-day volatility | 7.5% | 6.6% |
| Worst drawdown, 1 year | −8.5% | −8.0% |
| Trailing 12-month yield | 3.26% | 4.30% |
| Holdings | 710 | 2,763 |
| Top 10 weight | 46.4% | 7.2% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$31M thru Jul 2026 | +$196M thru Jun 2026 |
| 30-day implied volatility | — | 29.4% |
| Holdings as of | as of Oct 20, 2026issuer data | as of Oct 20, 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
53% of MBBA · 7% of SPMB| Holding | MBBA | SPMB |
|---|---|---|
| FHLMC 30YR UMBS, due May 1, 2056 | 1.01% | 1.01% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 11.34% | 0.96% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2051 | 0.85% | 0.41% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 6.18% | 0.39% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 1.33% | 0.33% |
| GNMA2 30YR TBA, due Nov 19, 2026 | 1.43% | 0.29% |
| FHLMC 30YR UMBS SUPER, due Apr 1, 2051 | 0.28% | 0.29% |
| FNMA 30YR UMBS, due Apr 1, 2051 | 0.23% | 0.25% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 2.67% | 0.18% |
| GNMA2 30YR, due Apr 20, 2052 | 1.58% | 0.17% |
| FNMA 30YR UMBS, due Jul 1, 2051 | 0.16% | 0.18% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 1.65% | 0.14% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 0.83% | 0.14% |
| GNMA2 30YR, due Dec 20, 2055 | 0.37% | 0.13% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 0.97% | 0.13% |
| UMBS 15YR TBA(REG B), due Nov 17, 2026 | 2.54% | 0.11% |
| GNMA2 30YR, due Jan 20, 2050 | 0.17% | 0.11% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 4.80% | 0.10% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2054 | 0.10% | 0.21% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 0.66% | 0.10% |
| GNMA2 30YR TBA(REG C), due Nov 19, 2026 | 1.95% | 0.10% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 3.58% | 0.09% |
| UMBS 15YR TBA(REG B), due Nov 17, 2026 | 0.16% | 0.06% |
| FNMA 30YR UMBS, due Sep 1, 2052 | 0.17% | 0.05% |
| FNMA 30YR UMBS, due Apr 1, 2051 | 0.16% | 0.05% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · MBBA holdings · SPMB 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.