State Street My2029 Municipal Bond ETF (MYMI)

The State Street My2029 Municipal Bond ETF (ticker MYMI) is an actively managed exchange-traded fund that invests principally in investment-grade municipal bonds with effective maturities around 2029. Unlike traditional municipal-bond funds that operate indefinitely, MYMI is engineered to liquidate on a predetermined date—December 15, 2029—returning the remaining principal to shareholders.

Origins and the shift toward defined maturity

State Street launched its MyIncome family of target-maturity bond ETFs in 2024, responding to a specific investor need: how to align a portfolio’s maturity with a known financial goal. For decades, individual investors who wanted to match bond maturities to future liabilities built their own ladders, purchasing many individual bonds maturing in successive years. This approach worked but demanded expertise, time, and substantial capital to achieve proper diversification.

The target-maturity ETF eliminates that friction by packaging a diversified ladder into a single tradable security. MYMI serves the investor who knows they will need capital around 2029—funding education costs, a home purchase, or retirement—and want the portfolio to mature accordingly. The fund’s design guarantees that, barring issuer defaults, shareholders receive their principal back near the target date rather than holding a perpetually aging fund or being forced to reinvest in a different rate environment.

Structure and holdings

MYMI holds a portfolio of investment-grade municipal bonds maturing in or around 2029. The fund invests at least 80% of net assets in municipal securities whose interest income is exempt from regular federal income tax. The portfolio spans bonds issued by cities, counties, school districts, transit authorities, water utilities, and other municipal entities across all fifty states. All holdings must meet investment-grade credit standards, typically BBB or higher, to maintain credit quality discipline.

State Street’s portfolio managers actively select specific bonds rather than tracking a published index. The strategy combines top-down analysis—evaluating interest-rate trends, credit spreads, and sector valuations—with bottom-up research into individual issuers, aiming to construct a ladder that matures smoothly over the next several years. As bonds mature and are repaid, the proceeds are distributed to shareholders rather than reinvested into longer-dated securities. This mechanical runoff ensures that the fund’s average maturity continually shortens, pulling duration down as 2029 approaches.

Tax treatment and cost structure

Municipal-bond interest is exempt from federal income tax, a feature built into all municipal bonds and flowing directly to MYMI shareholders. Distributions are reported as tax-exempt interest and incur no federal income-tax liability. State-level taxation is more granular: bonds issued by a state are typically exempt from that state’s income tax for residents; non-residents owe state tax on those same bonds. MYMI holds bonds from many states, so tax treatment at the state level depends on the shareholder’s residence and the issuer’s location.

The expense ratio is modest relative to actively managed municipal-bond funds, reflecting both the fund’s simplicity and State Street’s operational scale. Trading costs are minimal because the ETF trades like a stock on an exchange with tight spreads, offering liquidity far superior to buying dozens of individual municipal bonds.

Risks and approach

The fund faces credit risk—the possibility that a municipal issuer defaults or faces financial stress—though investment-grade screening minimizes that exposure. Interest-rate risk is present: if rates rise, bond prices fall, and an investor forced to sell before 2029 realizes a loss. However, this risk naturally declines as the fund approaches its target maturity; a bond maturing in months is far less sensitive to rate moves than one maturing years away.

Many municipal bonds carry call provisions, allowing issuers to refinance if rates fall. Called bonds are repaid early, forcing shareholders to redeploy capital in a lower-yield environment. Finally, though the ETF itself is liquid, the underlying municipal-bond market can experience stress during crises, potentially widening spreads.

Who MYMI serves

MYMI suits high-bracket investors seeking tax-exempt income aligned with a specific future need. It is most valuable in taxable accounts where the federal exemption generates real tax savings. It is unsuitable in tax-deferred accounts like IRAs, where the tax benefit is wasted. Once 2029 arrives, the fund winds down; it is not a perpetual holding. Investors should verify the current prospectus for expense ratios and review the portfolio composition to assess credit quality and state concentration.