State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF
SPDR SERIES TRUST · 1 share class
Fund classification
Classified from what the fund holds · as of 2026 Q2
State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF is a U.S. bond index ETF that tracks the Bloomberg U.S. MBS Index.
- Asset class
- Bonds
- Region
- United States
- Management
- Index (passive)
- Fund type
- ETF
- Rate sensitivity
- Intermediate duration
Fund profile
As filed in the prospectus · 2025 Q4
The State Street SPDR Portfolio Mortgage Backed Bond ETF (the Fund) seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. agency mortgage pass-through sector of the U.S. investment grade bond market.
The fund tracks the Bloomberg U.S. MBS Index using a sampling strategy, holding a subset of agency mortgage pass-through securities grouped by issuer, coupon, and origination year and selected to replicate the index's risk and return characteristics. Because the fund samples rather than holds all index constituents, its performance may diverge from the index. The fund regularly enters into to-be-announced transactions, parking assets in money market instruments pending settlement.
| Share class | Expense ratio |
|---|---|
| SPMB | 0.04% |
Portfolio turnover 12.00% · as of 2025 Q4
Allocation
Asset groups · long / short shown separately, never netted · 2026 Q2
| Securitized | 98.11% |
| Cash & short-term | 8.19% |
These positions come to 106.30% of the fund's net assets. This counts only what the fund reported holding — the holdings disclosure covers assets, not liabilities such as borrowings — so it is not expected to reconcile to 100%.
Latest quarter
What changed since the fund's previous filing
Largest new: UMBS, TBA ×4, Government National Mortgage Association ×3, Freddie Mac
Largest exited: UMBS, TBA ×5, Government National Mortgage Association ×3
Return profile
Total return as filed — price change plus distributions reinvested · trailing figures to Apr 2026
May 2026 and Jun 2026 have been filed since the trailing figures were struck, so they are not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
Debt profile
What this fund holds — value-weighted across its bond and securitized long positions · as of 2026-06-30
Share of the fund's debt by how its coupon behaves — the fact that decides whether a rate move reaches this portfolio at all.
| Fixed rate | 100.0% |
Share of the fund's debt value in each maturity band, shortest first.
| <1y | 0.0% |
| 1-3y | 0.0% |
| 3-5y | 0.1% |
| 5-10y | 2.3% |
| 10y+ | 97.6% |
Based on what filers reported; a filer that never reported a flag also reads as none.
Risk profile
Interest-rate and credit-spread sensitivity, both in years · as of 2026Q2
This fund filed the credit-spread disclosure and reported no sensitivity — measured, and the answer is none.
Where the loss would come from. The two shocks are the same size, so this is the balance of the fund's two sensitivities rather than a bet on one moving more.
| Interest rates | 100% |
Filers report the impact of a 0.01% move only, so the total is our own scaling of that one number and overstates the loss on most bonds — read it as approximate, never as precise. The two sensitivities overlap rather than add up: they measure the same positions against different shocks, which is why the durations above are shown side by side and never summed.
Share of duration at each point, shortest first. A positive figure loses value when spreads widen; a negative one offsets — a credit hedge.
| 3 mo | 0.02 yr | 0% |
| 1 yr | 0.52 yr | 9% |
| 5 yr | 1.41 yr | 25% |
| 10 yr | 2.80 yr | 50% |
| 30 yr | 0.80 yr | 14% |
Show the numbers
| Tenor | Rate yrs | IG yrs | HY yrs | IG $/bp | HY $/bp |
|---|---|---|---|---|---|
| 3 mo | +0.02 | +0.00 | +0.00 | $0 | $0 |
| 1 yr | +0.52 | +0.00 | +0.00 | $0 | $0 |
| 5 yr | +1.41 | +0.00 | +0.00 | $0 | $0 |
| 10 yr | +2.80 | +0.00 | +0.00 | $0 | $0 |
| 30 yr | +0.80 | +0.00 | +0.00 | $0 | $0 |
Dollar change per 1bp of spread movement, as filed and sign-anchored. A blank cell was not filed; a zero was.
Holdings
By % of NAV · equity positions carry filed share counts · every resolvable issuer links to its company page
| Ticker | Issuer | %NAV | Value | Shares |
|---|---|---|---|---|
| GVMXX | State Street Global AdvisorsGVMXX | 8.19% | $579.12M | — |
| — | Freddie Mac5.00% · due 2056-02-01 | 1.17% | $83.05M | — |
| — | Fannie Mae2.00% · due 2052-02-01 | 0.79% | $56.07M | — |
| — | Freddie Mac6.00% · due 2055-08-01 | 0.77% | $54.10M | — |
| — | UMBS, TBA5.50% · due 2056-07-01 | 0.63% | $44.54M | — |
| — | Freddie Mac2.50% · due 2052-05-01 | 0.61% | $43.39M | — |
| — | Freddie Mac5.50% · due 2054-11-01 | 0.55% | $39.01M | — |
| — | Government National Mortgage Association5.50% · due 2055-06-20 | 0.55% | $38.65M | — |
| — | Fannie Mae4.50% · due 2052-08-01 | 0.51% | $36.39M | — |
| — | Fannie Mae5.50% · due 2055-02-01 | 0.49% | $34.71M | — |
Top 10 positions are 14.27% of net assets, top 25 20.69%, across 5 issuers.
See more of this fund's book
More positions with filed share counts, and the quarter-over-quarter change list rather than the largest few — free with an account, no card required.
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