MBBA vs SMBS
iShares Mortgage-Backed Securities Active ETF against Schwab Mortgage-Backed Securities ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
2%
38 shared positions
Fee gap
22 bp
SMBS is cheaper
1-year return gap
—
Larger fund
SMBS
$6.4B
Side by side
| MBBA | SMBS | |
|---|---|---|
| Fund | iShares Mortgage-Backed Securities Active ETF | Schwab Mortgage-Backed Securities ETF |
| Issuer | iShares | Schwab |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.25% | 0.03% |
| Assets | $730M | $6.4B |
| Average daily dollar volume | $23M | $42M |
| Listed | May 18, 1998 | Nov 18, 2024 |
| FrenzyCap score | 66 | 94 |
| 1-month return | −1.1% | −1.2% |
| 3-month return | −2.7% | −2.8% |
| Year to date | — | −5.4% |
| 1-year return | — | −6.3% |
| 30-day volatility | 7.5% | 6.8% |
| Worst drawdown, 1 year | −8.5% | −8.4% |
| Trailing 12-month yield | 3.26% | 5.39% |
| Holdings | 710 | 4,197 |
| Top 10 weight | 46.4% | 2.9% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$31M thru Jul 2026 | +$310M thru May 2026 |
| 30-day implied volatility | — | — |
| Holdings as of | as of Oct 20, 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.
Largest shared holdings
9% of MBBA · 2% of SMBS| Holding | MBBA | SMBS |
|---|---|---|
| GNMA2 30YR, due Dec 20, 2055 | 0.37% | 0.24% |
| GNMA2 30YR, due Jul 20, 2051 | 2.07% | 0.16% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2051 | 0.85% | 0.16% |
| FNMA 30YR UMBS, due Jul 1, 2051 | 0.16% | 0.14% |
| GNMA2 30YR, due Dec 20, 2051 | 0.54% | 0.14% |
| GNMA2 30YR, due Apr 20, 2052 | 1.58% | 0.13% |
| FNMA 30YR UMBS, due Apr 1, 2051 | 0.16% | 0.10% |
| FHLMC 30YR UMBS SUPER, due Jan 1, 2053 | 0.14% | 0.10% |
| FNMA 30YR UMBS, due Apr 1, 2051 | 0.23% | 0.08% |
| FNMA 30YR UMBS, due May 1, 2055 | 0.08% | 0.08% |
| FNMA 30YR UMBS, due Sep 1, 2052 | 0.17% | 0.07% |
| FHLMC 30YR UMBS SUPER, due Apr 1, 2051 | 0.28% | 0.06% |
| GNMA2 30YR, due May 20, 2055 | 0.05% | 0.11% |
| FHLMC 30YR UMBS, due Sep 1, 2051 | 0.31% | 0.05% |
| FHLMC 30YR UMBS SUPER, due Jun 1, 2053 | 0.05% | 0.08% |
| FNMA 30YR UMBS SUPER, due Apr 1, 2052 | 0.66% | 0.04% |
| FHLMC 30YR UMBS SUPER, due Apr 1, 2052 | 0.04% | 0.12% |
| FHLMC 30YR UMBS SUPER, due Jun 1, 2052 | 0.09% | 0.04% |
| GNMA2 30YR, due Nov 20, 2055 | 0.04% | 0.21% |
| FHLMC 30YR UMBS, due Nov 1, 2051 | 0.04% | 0.04% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2054 | 0.10% | 0.04% |
| GNMA2 30YR, due Sep 20, 2051 | 0.04% | 0.12% |
| GNMA2 30YR, due Jan 20, 2050 | 0.17% | 0.03% |
| FHLMC 30YR UMBS SUPER, due Nov 1, 2053 | 0.11% | 0.03% |
| FHLMC 30YR UMBS, due May 1, 2051 | 0.20% | 0.03% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · MBBA holdings · SMBS 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.