SPSB vs ZTRE

SPSBAState Street SPDR Portfolio Short Term Corporate Bond ETF

ZTRECF/M 3-Year Investment Grade Corporate Bond Etf

In short

SPSB The short end of the corporate bond market, bought wholesale: roughly 1,600 investment-grade corporate bonds maturing in one to three years, for four basis points. Built as a cash-adjacent building block, not a yield swing.

ZTRE ZTRE skips the maturity blender. It holds investment-grade corporate bonds with roughly three years left and rebalances monthly, so the three-year point on the credit curve stays the three-year point.

Stated mandate

SPSB The fund seeks to track the price and yield performance of the Bloomberg U.S. 1-3 Year Corporate Bond Index before fees and expenses.

ZTRE The fund seeks to track the ICE 3-Year US Target Maturity Corporate Index before fees and expenses. It is passively managed and normally invests at least 80% of assets in investment-grade corporate bonds maturing in approximately 2.5 to less than 3.5 years.

Why people hold it

• SPSB Costs 0.04% a year against a 0.19% median for investment-grade corporate bond funds. At the short end, where yields are thin, that gap is a real slice of what you keep.
• Nothing in the index matures past three years, so rate moves push the price around less than they do at intermediate corporate funds like SPIB or VCIT.ssga.com
• Roughly 1,600 bonds, market-cap weighted, reconstituted at each month end, with a $300 million minimum issue size. Income arrives monthly.ssga.com
• Trading since 2009 and now a multi-billion-dollar fund that changes hands actively, one of the sturdier implementations in its peer group.

• ZTRE Precision over averages: bonds must have 2.5 to under 3.5 years left, and monthly rebalancing keeps that maturity from drifting as the portfolio ages.fminvest.com
• 0.15% a year, under the typical investment-grade corporate ETF, and income lands monthly rather than on the semiannual schedule of the underlying bonds.fminvest.com
• Roughly 500 issues, weighted evenly by design, so the heaviest borrowers do not automatically claim the biggest slice the way they do in debt-weighted bond indexes.fminvest.com
• One rung of a corporate ladder the issuer built from two years out to ten, for investors who want to pick a spot on the curve instead of buying the whole thing.fminvest.com

Worth knowing

• SPSB Pure corporate credit, no Treasury ballast. Investment-grade paper still reprices when spreads widen, short maturities or not.ssga.com
• Bonds roll off fast and get replaced at whatever the market pays, so the income stream follows prevailing rates in both directions.ssga.com
• The manager samples the index rather than buying every bond in it, so the portfolio can drift modestly from the benchmark.sec.gov

• ZTRE Small and thinly traded since its 2024 debut, which can mean wider bid-ask gaps than the household names of the category.
• Fair price, not the floor: broad investment-grade rivals VCIT and IGSB run closer to 0.04%, though neither pins itself to a single maturity point.
• The fund has changed underlying indexes since launch, so the current benchmark is worth checking rather than assuming the original one still applies.fminvest.com

Full SPSB profile⁠

Full ZTRE profile⁠