FLDR vs SPSB

FLDR—Fidelity Low Duration Bond Factor ETF

SPSBAState Street SPDR Portfolio Short Term Corporate Bond ETF

In short

FLDR Most ultra-short bond funds are parking lots for cash. FLDR is the rules-based one: a Fidelity index of roughly 250 investment-grade bonds built to keep interest-rate sensitivity low, priced under the typical ultra-short fund.

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

FLDR The fund seeks to track, before fees and expenses, the performance of the Fidelity Low Duration Investment Grade Factor Index.

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

• FLDR Charges 0.15% a year, below the 0.20% median for ultra-short bond funds and level with top-ranked peers SHV, PULS and DUSB.
• Rules first, hunches never. It passively tracks the published Fidelity Low Duration Investment Grade Factor Index, so the recipe is written down.
• Pays monthly and spreads the work across about 250 investment-grade holdings, so no single issuer carries the portfolio.
• Live since 2018 and now a multi-billion-dollar fund, it stands among the stronger implementations in its ultra-short bond peer group.

• 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

• FLDR Low duration is not zero duration. The mandate keeps rate sensitivity short, but the share price still moves. This is a bond ETF, not a money market fund.
• The index is investment-grade credit, not pure government paper like SHV's Treasury sleeve, so credit conditions feed into the price.
• Moderately traded rather than a volume monster, so spreads can run wider than the largest cash-parking ETFs.

• 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 FLDR profile⁠

Full SPSB profile⁠