State Street® SPDR® Portfolio Mortgage Backed Bond ETF

State Street® SPDR® Portfolio Mortgage Backed Bond ETF

About

State Street® SPDR® Portfolio Mortgage Backed Bond ETF (US78464A3831) is a US-listed bond ETF tracking the Bloomberg U.S. MBS Index. With a expense ratio of 0.04%, it ranks among the lowest-cost options in its category, paying distributions. The fund holds 2,698 positions with 7.0B in assets.

Score Breakdown

Scores are scaled 1–10 on a logarithmic curve relative to all ETFs in the database. Last updated: Jul 5, 2026
Component Score Details
Cost (30%) 9.3 Tracking Difference: 8.9 · TD Consistency: — · Expense Ratio: 10.0
Liquidity (25%) 9.7 Assets Under Management

Data sources: provider factsheets, exchange data, and NAV history. Information for educational purposes only — not investment advice.

ISIN
Fund Size $7.0B
Issuer SPDR
Distribution Pays Distributions
Replication Physical
Inception Jan 2009
Base Currency USD
Index Bloomberg U.S. MBS Index
Asset Class Bonds
Category Securitized Bond

Costs

9.3
This fund has low total costs, with competitive tracking and expense ratios.

Cost Metrics Explained

What expense ratio, tracking difference, and TD consistency measure

Expense ratio (Total Expense Ratio) is the annual fee the fund charges, deducted from assets. It’s the headline cost, but not the full picture.

Tracking Difference measures how much the fund actually lags (or leads) its benchmark index per year. This is the single best measure of true cost — it captures the expense ratio plus all other drags like sampling error and tax withholding. A lower (or negative) value is better.

TD Consistency measures how stable the tracking difference is from year to year. A low value means predictable, reliable costs; a high value means costs can vary significantly.
Expense Ratio0.00%
 
Metric Value
Expense Ratio 0.04%

Cumulative Returns

Performance across different time periods.
1 Month+0.00%
3 Months+0.00%
Year to Date+0.00%
1 Year+0.00%
3 Years+0.00%
5 Years+0.00%
Inception+0.00%
 
Period Cumulative Return
1 Month +0.30%
3 Months -0.01%
6 Months -0.01%
1 Year +6.79%
3 Years +4.32%
5 Years +0.38%
10 Years +1.32%
YTD +0.83%
Since Inception +2.28%

Holdings

9.4
This fund spreads its investments across 2,698 individual holdings, providing broad diversification.
#1
S
SSI US GOV MONEY MARKET CLASS
8.25%
#2
F
FED HM LN PC POOL RQ0094 FR 02/56 FIXED 5
1.18%
#3
F
FNMA TBA 30 YR 5.5 SINGLE FAMILY MORTGAGE
0.93%
#4
F
FNMA POOL MA4547 FN 02/52 FIXED 2
0.79%
#5
F
FED HM LN PC POOL RQ0041 FR 08/55 FIXED 6
0.77%
#6
F
FNMA TBA 30 YR 5 SINGLE FAMILY MORTGAGE
0.76%
#7
F
FED HM LN PC POOL SD8212 FR 05/52 FIXED 2.5
0.61%
#8
F
FED HM LN PC POOL SD8475 FR 11/54 FIXED 5.5
0.55%
#9
G
GNMA II POOL MB0424 G2 06/55 FIXED 5.5
0.55%
#10
G
GNMA II TBA 30 YR 5 JUMBOS
0.54%

Sectors

Allocation by industry sector.
 
Sector Weight
Unknown 10000.00%

Regions

Geographic allocation by country of risk.
 
Country Weight
UNKNOWN 10000.00%

Documents

Regulatory and fund documents.
Fact Sheet

Similar ETFs

Other funds tracking Securitized Bond indices.
iShares MBS ETF
MBB·Expense Ratio 0.04%
iShares AAA CLO Active ETF
CLOA·Expense Ratio 0.20%
iShares Mortgage-Backed Securities Active ETF
MBBA·Expense Ratio 0.25%
Compare State Street® SPDR® Portfolio Mortgage Backed Bond ETF vs MBB Compare State Street® SPDR® Portfolio Mortgage Backed Bond ETF vs CLOA Compare State Street® SPDR® Portfolio Mortgage Backed Bond ETF vs MBBA
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