MUB vs RMCA

MUBAiShares National Muni Bond ETF

RMCACRockefeller California Municipal Bond ETF

In short

MUB Municipal bonds, indexed and cheap. Since 2007, MUB has packaged investment-grade national munis into tax-exempt monthly income for five basis points a year, and it sits among the deepest pools in the muni-ETF aisle.

RMCA Most muni ETFs buy the whole country. RMCA buys California, actively, going after income exempt from both federal and California state tax. A boutique single-state take from the Rockefeller name, launched in 2024.

Stated mandate

MUB The fund seeks to track an index of investment-grade U.S. municipal bonds, providing diversified exposure to the national municipal-bond market and tax-exempt income.

RMCA The Fund seeks tax-exempt income at both the U.S. federal and California state levels through investments in California municipal bonds.

Why people hold it

• MUB 0.05% a year against a muni-ETF median near 0.30%. In a category built on modest, tax-exempt yields, that fee gap is real money left in the fund.
• The benchmark is AMT-free: the ICE AMT-Free US National Municipal Index screens out munis whose interest can be pulled into the alternative minimum tax.ishares.com
• Tracks its index closely, one of the tighter jobs in its peer group, and distributes monthly. A multi-billion-dollar fund that trades actively.
• Broad investment-grade exposure across the national muni market, spread over thousands of issuers rather than one state's budget.ishares.com

• RMCA Single-state by design: California municipal bonds, targeting income exempt from both federal and California state income tax.yahoo.com
• Actively managed, not an index clone: at least 80% of net assets go into bonds whose interest is exempt from federal and California state tax.yahoo.com
• Income arrives monthly rather than quarterly.
• What it holds matches what it advertises: the portfolio stays inside the California muni brief in its prospectus.

Worth knowing

• MUB Two rivals undercut it: VTEB and SCMB both run 0.03%. A two-basis-point gap is small, but it is a gap.
• A bond fund with no maturity date to hold to. Share prices move with interest rates and muni credit conditions, both directions.
• National by design, so no single-state tilt and no in-state tax angle. iShares runs state-specific muni funds such as NYF for that job.

• RMCA 0.55% a year against a 0.30% median for muni bond ETFs, and national index funds like VTEB and MUB charge a few basis points.
• A small fund that trades lightly, so bid-ask spreads can run wider than at the category's giants.
• Non-diversified and tied to one state, so California budget and credit news moves it more than a 50-state portfolio would.yahoo.com

Full MUB profile⁠

Full RMCA profile⁠