BBBS vs SPSB

BBBSCBondBloxx BBB Rated 1-5 Year Corporate Bond ETF

SPSBAState Street SPDR Portfolio Short Term Corporate Bond ETF

In short

BBBS Most investment-grade bond funds blend AAA down to BBB. BBBS takes only the bottom rung, BBB rated corporates, and caps maturities under five years. A ratings dial you set yourself, not a grab bag.

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.

Stated mandate

BBBS The Fund seeks to track the Bloomberg US Corporate BBB 1-5 Year Index, which represents taxable, fixed-rate, U.S. dollar-denominated BBB corporate bonds with remaining maturities from one to less than five years.

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.

Why people hold it

• BBBS One job, done narrowly: the index covers taxable, fixed-rate, dollar-denominated BBB corporate bonds maturing in one to under five years. Credit tier and maturity are both pinned down.
• Short maturities mean far less rate sensitivity than long-dated corporate funds, and the basket spreads across many issuers rather than leaning on a handful.
• Sits in the upper half of a crowded investment-grade corporate field of dozens of ETFs, and it tracks its stated Bloomberg index closely.

• 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.

Worth knowing

• BBBS The 0.19% fee is typical for investment-grade corporate ETFs, but broad short-term peers like IGSB and SPIB charge a small fraction of that for a wider credit mix.
• BBB is the last rung before high yield. Isolating it means more credit sensitivity than an all-grade fund that dilutes with AAA and AA paper.
• A small, thinly traded fund launched in 2024, so spreads can run wider than at the giants and distributions have not settled into a fixed rhythm.

• 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

Full BBBS profile⁠

Full SPSB profile⁠