IBMP vs MYMK

IBMPAiShares iBonds Dec 2027 Term Muni Bond ETF

MYMKDState Street My2031 Municipal Bond ETF

In short

IBMP A single rung of a muni ladder in one ticker: investment-grade bonds that all mature in 2027, tax-exempt income paid monthly along the way, and a defined end date instead of a fund that rolls on forever.

MYMK A single rung of a muni ladder: MYMK holds tax-exempt bonds maturing in 2031, then returns remaining principal and closes on or about December 15, 2031. Unlike the big index ladders, a State Street team picks the bonds.

Stated mandate

IBMP The fund seeks to track an index of investment-grade municipal bonds maturing in 2027. It is designed to provide tax-exempt income, support bond-ladder construction, and manage interest-rate risk through a defined maturity.

MYMK The fund is an actively managed target-maturity municipal bond strategy focused primarily on bonds maturing in 2031. It seeks current federal-tax-exempt income while also seeking capital preservation.

Why people hold it

• IBMP Built to act like a bond, not a bond fund: the portfolio matures in 2027 and the whole design points at that date, which is what makes ladder-building possible with one trade.ishares.com
• 0.10% a year, right at the typical target-maturity bond fund, and it tracks an AMT-free index, so the tax-exempt income isn't pulled back in by the alternative minimum tax.
• Roughly 1,800 municipal bonds, so no single issuer carries the fund. That spread is hard to replicate buying individual munis one CUSIP at a time.
• Income lands monthly, and this 2027 rung has been running since 2019, so it isn't a fresh launch built for the moment.

• MYMK Actively managed rather than index-tracked: the team works top-down across sectors and issuers, with the ICE 2031 Maturity US Broad Municipal Index as the yardstick.businesswire.comssga.com
• The defined end date does the work of a maturity: the fund distributes any remaining principal and liquidates on or about December 15, 2031.ssga.com
• Income is exempt from regular federal income tax and paid monthly, with preservation of capital named as the second goal.
• Roughly 80 bonds spread issuer risk that you would carry concentrated if you bought a couple of individual munis yourself.

Worth knowing

• IBMP The 0.10% fee is the category median, not a discount. Treasury and corporate rungs like IBTJ (0.07%) and VBCB (0.08%) cost less, though neither pays tax-exempt muni income.
• The tax exemption is the entire pitch, and it does no work inside an IRA or 401(k), where the income is already sheltered.
• Trading is moderate rather than heavy, so order size and timing matter more here than in the most heavily traded bond ETFs.

• MYMK The 0.20% fee sits above index-run ladder rungs like iShares iBonds (IBTJ) and Invesco BulletShares (BSCT). That is the price of a manager picking bonds.
• Small and thinly traded next to the established ladder families, so the bid-ask spread is a real part of your cost.
• In the target year, proceeds from bonds maturing before the liquidation date may sit in cash and cash equivalents, which can trim income in the final stretch.ssga.com

Full IBMP profile⁠

Full MYMK profile⁠