SPMB vs VMBS
State Street SPDR Portfolio Mortgage Backed Bond ETF against Vanguard Mortgage-Backed Securities ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
21%
825 shared positions
Fee gap
1 bp
VMBS is cheaper
1-year return gap
0.5 pts
VMBS is ahead
Larger fund
VMBS
$15.7B
Side by side
| SPMB | VMBS | |
|---|---|---|
| Fund | State Street SPDR Portfolio Mortgage Backed Bond ETF | Vanguard Mortgage-Backed Securities ETF |
| Issuer | State Street SPDR | Vanguard |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.04% | 0.03% |
| Assets | $6.8B | $15.7B |
| Average daily dollar volume | $50M | $120M |
| Listed | Jan 15, 2009 | Nov 19, 2009 |
| FrenzyCap score | 95 | 99 |
| 1-month return | −1.3% | −1.1% |
| 3-month return | −2.9% | −2.8% |
| Year to date | −4.7% | −4.7% |
| 1-year return | −5.6% | −5.1% |
| 30-day volatility | 6.6% | 6.2% |
| Worst drawdown, 1 year | −8.0% | −7.7% |
| Trailing 12-month yield | 4.30% | 4.38% |
| Holdings | 2,763 | 4,939 |
| Top 10 weight | 7.2% | 2.7% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$196M thru Jun 2026 | +$460M thru May 2026 |
| 30-day implied volatility | 48.5% | 7.9% |
| Holdings as of | as of Oct 19, 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
47% of SPMB · 27% of VMBS| Holding | SPMB | VMBS |
|---|---|---|
| FNMA TBA 30 YR 6.5 SINGLE FAMILY MORTGAGE, due Nov 12, 2056 | 0.33% | 0.28% |
| GNMA II POOL MB0871 G2 01/56 FIXED 5, due Jan 20, 2056 | 0.49% | 0.28% |
| FED HM LN PC POOL RQ0094 FR 02/56 FIXED 5, due Feb 1, 2056 | 1.13% | 0.27% |
| GNMA II POOL MB1216 G2 06/56 FIXED 5, due Jun 20, 2056 | 0.41% | 0.26% |
| FED HM LN PC POOL RQ0118 FR 05/56 FIXED 5, due May 1, 2056 | 1.01% | 0.24% |
| GNMA II POOL MB1070 G2 04/56 FIXED 5, due Apr 20, 2056 | 0.31% | 0.23% |
| FED HM LN PC POOL RQ0056 FR 10/55 FIXED 5.5, due Oct 1, 2055 | 0.39% | 0.21% |
| GNMA II POOL MB1285 G2 07/56 FIXED 5.5, due Jul 20, 2056 | 0.21% | 0.21% |
| FED HM LN PC POOL SD8128 FR 02/51 FIXED 2, due Feb 1, 2051 | 0.28% | 0.20% |
| FED HM LN PC POOL SD8106 FR 11/50 FIXED 2, due Nov 1, 2050 | 0.31% | 0.18% |
| FNMA TBA 30 YR 6 SINGLE FAMILY MORTGAGE, due Nov 12, 2056 | 0.39% | 0.18% |
| GNMA II POOL MA7135 G2 01/51 FIXED 2, due Jan 20, 2051 | 0.27% | 0.18% |
| FED HM LN PC POOL SD8121 FR 01/51 FIXED 2, due Jan 1, 2051 | 0.34% | 0.17% |
| GNMA II POOL MA7826 G2 01/52 FIXED 2, due Jan 20, 2052 | 0.34% | 0.17% |
| FNMA POOL MA5530 FN 11/54 FIXED 5, due Nov 1, 2054 | 0.29% | 0.16% |
| FNMA POOL MA4378 FN 07/51 FIXED 2, due Jul 1, 2051 | 0.28% | 0.16% |
| FNMA POOL MA4305 FN 04/51 FIXED 2, due Apr 1, 2051 | 0.25% | 0.16% |
| GNMA II POOL MB1344 G2 08/56 FIXED 5.5, due Aug 20, 2056 | 0.27% | 0.16% |
| GNMA II POOL MA8267 G2 09/52 FIXED 4, due Sep 20, 2052 | 0.17% | 0.16% |
| GNMA II POOL MA8346 G2 10/52 FIXED 4, due Oct 20, 2052 | 0.21% | 0.16% |
| FED HM LN PC POOL SD8177 FR 11/51 FIXED 2, due Nov 1, 2051 | 0.41% | 0.15% |
| FNMA POOL MA4255 FN 02/51 FIXED 2, due Feb 1, 2051 | 0.25% | 0.15% |
| FNMA POOL MA4437 FN 10/51 FIXED 2, due Oct 1, 2051 | 0.35% | 0.15% |
| GNMA II POOL MB1284 G2 07/56 FIXED 5, due Jul 20, 2056 | 0.20% | 0.15% |
| GNMA II POOL MB0624 G2 09/55 FIXED 6, due Sep 20, 2055 | 0.16% | 0.15% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · SPMB 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.