RiverNorth Managed Duration Municipal Income Fund II, Inc. (RMMZ)
RiverNorth Managed Duration Municipal Income Fund II is a closed-end fund that buys municipal bonds—the tax-exempt debt issued by states, cities, and other local authorities—and uses leverage and active management to generate income that reaches back to shareholders. The fund is one vehicle among many that democratizes access to municipal bond portfolios, but it differs in structure: it is a permanent fund with a fixed pool of shares, rather than an open-end mutual fund that can be bought and sold at net asset value any trading day. That structure lets it use borrowed money to magnify returns, a tactic that works as long as the yield on bonds exceeds what the fund pays to borrow.
The closed-end structure and leverage advantage
A closed-end fund is issued once, with a set number of shares, and those shares then trade on an exchange like any stock. Contrast this with an open-end mutual fund, which sells new shares and redeems old ones at net asset value daily. The closed-end form has one powerful consequence: because capital doesn’t flee when markets fall, the fund can borrow money against its portfolio—employ leverage—in ways mutual funds typically cannot. RiverNorth Managed Duration Municipal Income Fund II uses this borrowing to buy more bonds than the cash invested by shareholders would alone permit, amplifying both gains and losses.
The logic is straightforward. If the fund buys municipal bonds yielding 4 percent and borrows at 2 percent, the net spread—2 percent—goes to shareholders. But that gap only exists if rates stay as they are. A rise in interest rates that pushes bond prices down, or a squeeze in lending rates that raises the cost of borrowing, compresses or inverts that margin. The fund is betting that the gap persists.
Municipal bonds and tax-free income
Municipal bonds are issued to fund public works—roads, schools, hospitals, water systems—and the interest they pay is exempt from federal income tax. For high-income taxpayers, that tax exemption turns a mediocre yield into an attractive after-tax return. A municipal bond yielding 4 percent, for example, is worth more than a taxable bond yielding 4 percent to an investor in the highest federal tax bracket, because all 4 percent of the municipal bond’s return ends up in the investor’s pocket, while the taxable bond’s return gets clipped for taxes.
RiverNorth Managed Duration Municipal Income Fund II bets that this tax advantage makes munis cheap enough to justify leverage. The fund’s management actively chooses which munis to hold, trying to pick bonds that will outperform and manage the overall maturity profile of the portfolio—a practice called duration management—to position the fund for interest-rate moves.
The risks of leverage and duration
Leverage is a double-edged tool. When bond markets are calm, the interest-rate spread favors the fund and shareholders pocket extra income. But in a stress scenario—a wave of tax-hike expectations, a credit squeeze, or a sudden jump in borrowing rates—the fund’s cost to maintain leverage can spike while bond prices fall simultaneously, eroding both the margin and the underlying portfolio value. A shareholder who bought at a premium to net asset value (trading prices often drift above or below the underlying portfolio’s value) faces a compounded loss: the portfolio declines and the leverage costs more.
Duration management adds another layer of complexity. Duration measures how much a bond’s price moves when interest rates change. A high-duration portfolio is more sensitive to rate moves, which is an advantage if rates fall and a disadvantage if they rise. Management has to make bets about the interest-rate cycle, and those bets can be wrong.
Dividend and market price
The fund aims to pay a steady monthly distribution to shareholders, drawn from the income the bonds throw off plus any gains from trading or matured securities. That high distribution is the main draw for individual investors, but it creates a tension: the fund’s share price on the market often trades at a discount to its net asset value, reflecting that leverage and the cost of it. A buyer at a discount has a different expected return than someone who buys at a premium. Tracking the premium or discount is essential for understanding what return the investment is likely to deliver.
How to research the fund
Start with the fund’s annual report (SEC CIK 0001870833) and monthly fact sheets, which break down the portfolio’s composition, the leverage ratio, and the weighted average maturity. Watch the net asset value per share against the market price to understand whether the fund is trading at a premium or discount, and track the monthly distribution rate relative to the current net asset value—a yield that has climbed sharply may signal stress in the portfolio or unsustainable distribution levels. Interest-rate expectations are central to the fund’s performance; when the Federal Reserve signals a shift in policy, the duration and leverage positioning of municipal bond funds should be reassessed.