ETF and Mutual Fund Analysis

Holdings as of August 12, 2026

ETF and Mutual Fund Analysis

Overlap, Comparison, and Diversification for Your Portfolio

Home > Compare > SPAB vs SPMB Holdings as of August 12, 2026

SPAB vs SPMB: Portfolio Overlap

State Street(R) SPDR(R) Portfolio Aggregate Bond ETF vs State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF

21.5%
Weighted portfolio overlap
Moderate Overlap

Moderate Overlap. A recognisable amount of shared weight, common among funds drawing on the same large-cap pool. Much of it typically sits in the top conviction holdings.

SPAB
8548 equity holdings
as of August 12, 2026
SPMB
2722 equity holdings
as of August 12, 2026
688 stocks held in common
Overlap View Venn Diagram
21.5% OVERLAP SPAB SPMB
Overlapping Holdings
10 Top 10 of 688 shared, by overlap contribution
# Stock SPAB SPMB Overlap%
1
SSI US GOV MONEY MARKET CLASS
 3.76% 6.61% 3.76%
2
FNMA TBA 30 YR 5.5 SINGLE FAMILY MORTGAGE
 0.43% 0.91% 0.43%
3
FNMA TBA 30 YR 5 SINGLE FAMILY MORTGAGE
 0.35% 0.77% 0.35%
4
GNMA II TBA 30 YR 5 JUMBOS
 0.26% 0.50% 0.26%
5
FNMA TBA 30 YR 2.5 SINGLE FAMILY MORTGAGE
 0.26% 0.25% 0.25%
6
GNMA II TBA 30 YR 5.5 JUMBOS
 0.25% 0.40% 0.25%
7
FNMA TBA 30 YR 6 SINGLE FAMILY MORTGAGE
 0.24% 0.55% 0.24%
8
GNMA II TBA 30 YR 4.5 JUMBOS
 0.19% 0.20% 0.19%
9
FNMA POOL MA4465 FN 11/51 FIXED 2
 0.19% 0.43% 0.19%
10
GNMA II POOL MB1216 G2 06/56 FIXED 5
 0.18% 0.39% 0.18%
Most Divergent Holdings Stocks held by one fund but absent from the other
Only in SPAB — State Street(R) SPDR(R) Portfolio Aggregate Bond ETF
StockWeight
US TREASURY N/B 12/28 3.50.72%
US TREASURY N/B 12/30 3.6250.54%
US TREASURY N/B 11/27 3.3750.44%
US TREASURY N/B 11/28 4.3750.40%
US TREASURY N/B 05/36 4.3750.40%
Only in SPMB — State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF
StockWeight
FNMA POOL MA4547 FN 02/52 FIXED 20.72%
FNMA POOL FA0608 FN 02/55 FIXED VAR0.45%
FED HM LN PC POOL RQ0137 FR 07/56 FIXED 5.50.39%
GNMA II POOL MB0871 G2 01/56 FIXED 50.38%
FNMA POOL CC0119 FN 03/55 FIXED 60.34%

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Frequently Asked Questions (FAQs)
What is the portfolio overlap between SPAB and SPMB?

SPAB (State Street(R) SPDR(R) Portfolio Aggregate Bond ETF) and SPMB (State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF) share 21.5% portfolio overlap as of their August 12, 2026 filings, across 688 common stocks. Overlap is the sum of the smaller weight of each shared stock, so it reads as the share of a dollar that lands on the same companies in both funds.

Do SPAB and SPMB invest in the same stocks?

Somewhat. The two funds share a meaningful set of stocks, though each also holds distinct positions the other does not.

What are the top stocks held by both SPAB and SPMB?

The most prominent shared holdings (by combined weight) are: SSI US GOV MONEY MARKET CLASS, FNMA TBA 30 YR 5.5 SINGLE FAMILY MORTGAGE, FNMA TBA 30 YR 5 SINGLE FAMILY MORTGAGE. See the full common-holdings table on this page for weights in each fund.

Related Comparisons
SPAB — State Street(R) SPDR(R) Portfolio Aggregate Bond ETF vs SPSB — State Street(R) SPDR(R) Portfolio Short Term Corporate Bond ETFSPMB — State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF vs SPSB — State Street(R) SPDR(R) Portfolio Short Term Corporate Bond ETFBIL — State Street(R) SPDR(R) Bloomberg 1-3 Month T-Bill ETF vs SPAB — State Street(R) SPDR(R) Portfolio Aggregate Bond ETFBIL — State Street(R) SPDR(R) Bloomberg 1-3 Month T-Bill ETF vs SPMB — State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETFSPAB — State Street(R) SPDR(R) Portfolio Aggregate Bond ETF vs SPHY — State Street(R) SPDR(R) Portfolio High Yield Bond ETFSPHY — State Street(R) SPDR(R) Portfolio High Yield Bond ETF vs SPMB — State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF