FUMB vs TAXS

FUMBCFirst Trust Ultra Short Duration Municipal ETF

TAXSANorthern Trust Short-Term Tax-Exempt Bond ETF

In short

FUMB Active ultra-short munis with a filter: First Trust's managers hand-pick bonds that fund basic infrastructure and essential local services, and keep portfolio duration under a year. Federally tax-exempt income, paid monthly, for 0.45%.

TAXS Northern Trust's muni index fund keeps every bond under five years to maturity and charges 0.05%, a fraction of the typical muni ETF fee. Roughly 1,700 federally tax-exempt bonds, none of them AMT bonds, with interest paid monthly.

Stated mandate

FUMB FUMB seeks federally tax-exempt income while preserving capital. Normally, it invests at least 80% of net assets in municipal debt securities whose interest is exempt from regular federal income tax.

TAXS The fund seeks to track, before fees and expenses, the price and yield performance of the ICE Short-term Focused Municipal Bond Index. It is designed for tax-exempt income through passively managed, investment-grade municipal bonds with short-term maturities.

Why people hold it

• FUMB Built to sit at the very short end: the prospectus targets a weighted average duration of less than one year, the lever that governs how much a bond portfolio's price moves when rates move.sec.gov
• The selection screen is unusual for a park-your-cash fund: munis that meet basic infrastructure needs or critical community services, across at least 10 states, tilted toward growing populations and healthy employment.sec.gov
• Roughly 300 muni positions, with interest exempt from regular federal income tax, distributed monthly rather than quarterly.
• No index to copy. A human team picks the bonds and has run this mandate since the 2018 launch, which is early for an ultra-short muni ETF.sec.gov

• TAXS 0.05% a year sits at the low end of the muni aisle, where the typical fund charges several times that, and matches the fee on MUB, the category's iShares heavyweight.
• Index rules admit only investment-grade bonds with under five years left to final maturity, so the portfolio skips the long-end price swings that define all-maturity muni funds.flexshares.com
• About 1,700 bonds, all exempt from federal tax and screened to exclude alternative minimum tax paper, with income distributed monthly rather than accrued.flexshares.com
• Passive, sampled, and run by Northern Trust's municipal desk, which has managed muni portfolios for more than 30 years. The index does the picking, not a manager's hunch.flexshares.comnortherntrust.com

Worth knowing

• FUMB 0.45% sits above the category median and well above index-run neighbors: VTES at 0.05%, SUB at 0.07%, GUMI at 0.16%. Active credit research is what the gap buys.
• Tax-exempt here means regular federal income tax. It is not automatically exempt from your state's income tax.
• A few-hundred-million-dollar fund that trades moderately, not one of the category's liquidity giants, so bid-ask spreads carry more weight on entry and exit.

• TAXS It launched in 2025 and trades lightly next to muni mainstays like VTEB and MUB, so spreads can run wider and the track record is short.
• Federally tax-exempt is not tax-free. That interest can still be taxed by your state and city.flexshares.com
• Sub-five-year munis generally carry lower yields than longer maturity portfolios. That is the other side of the milder rate sensitivity.flexshares.com

Full FUMB profile⁠

Full TAXS profile⁠