FLDB vs VBIL

FLDBCFidelity Low Duration Bond ETF

VBILAVanguard 0-3 Month Treasury Bill ETF

In short

FLDB Fidelity's 2024-vintage cash-adjacent bond fund: roughly 300 short-maturity holdings measured against 6-to-9-month T-bills, with income paid monthly. A diversified credit mix where many category rivals hold Treasuries and little else.

VBIL Vanguard's cash-parking ETF: roughly two dozen Treasury bills, none maturing more than three months out, at 0.06% a year. It landed in 2025 and undercut most of the T-bill shelf on price.

Stated mandate

FLDB FLDB uses a diversified, low-duration bond strategy to pursue substantial current income while seeking to preserve capital.

VBIL VBIL seeks to track the performance of a market-weighted Treasury index with an ultra-short-term dollar-weighted average maturity, using a passive approach designed to follow the Bloomberg U.S. Treasury Bills 0-3 Months Index.

Why people hold it

• FLDB Spreads risk across roughly 300 short-maturity bonds rather than one Treasury sleeve, with the Bloomberg U.S. Treasury Bill: 6-9 Months Index as its yardstick.fidelity.com
• Pays monthly, matching a mandate written around substantial current income while seeking to preserve capital.fidelity.com
• Stays inside its stated low-duration remit instead of stretching maturities for extra yield, and has pulled in hundreds of millions since its 2024 debut.

• VBIL It charges 0.06% a year, well under the 0.14% median for 0-1 year Treasury funds and under the category veteran, BIL.
• Plain passive mandate on the Bloomberg U.S. Treasury Bills 0-3 Months Index, tracked very closely. One of the tightest implementations in its peer group.vanguard.com
• Roughly two dozen bills backed by the US Treasury, every one maturing inside three months. Interest goes out monthly.
• A multi-billion-dollar fund with active daily trading, which tends to keep bid-ask costs small.

Worth knowing

• FLDB The 0.20% fee sits at the category median, and cheaper shelf-mates undercut it: VUSB at 0.10%, SHV, PULS and Fidelity's own FLDR at 0.15%.
• Thinly traded next to the ultrashort category's household names, which can mean wider bid-ask spreads on the way in and out.
• Launched February 2024, so its record is short and has not yet spanned a full rate cycle.

• VBIL The payout floats with short-term rates. Monthly income rises and falls with what bills yield, and nothing about it is fixed.
• It opened in 2025, so its live record is short next to T-bill funds that have been running for years.
• Stretching maturity gets cheaper: peer XONE targets one-year duration at 0.03%, trading lower cost for more rate sensitivity.

Full FLDB profile⁠

Full VBIL profile⁠