JMTG vs MBB

JMTGBJPMorgan Mortgage-Backed Securities ETF

MBBAiShares MBS ETF

In short

JMTG Most mortgage-bond ETFs just clone the index. JMTG hands agency-style mortgage debt to a J.P. Morgan team that picks its spots, backed by a strategy running since 2000 and a monthly payout.

MBB Launched in 2007, MBB is the plain-vanilla way to own U.S. agency mortgage bonds: one of the biggest and busiest funds in a small niche, tracking the Bloomberg U.S. MBS Index for four basis points.

Stated mandate

JMTG The fund seeks to maximize total return by investing primarily in a diversified portfolio of debt securities backed by pools of residential mortgage loans.

MBB The fund seeks to track an index composed of U.S. agency mortgage-backed securities.

Why people hold it

• JMTG At 0.24% a year it undercuts the typical fund in its mortgage-bond group (0.35% median), and it does that while running an active mandate rather than tracking an index.
• The job description is plain: maximize total return from a diversified portfolio of debt backed by pools of residential mortgages, spread across several thousand individual bonds.
• A multi-billion-dollar fund that changes hands actively and distributes monthly, so income lands twelve times a year instead of four.
• The strategy's history reaches back to 2000, and among the mortgage-bond funds we cover it ranks in the upper tier of its peer group.

• MBB Four basis points to rent the entire agency mortgage market, against a category median near 0.35%. In low-coupon bond land, that gap compounds quietly.
• Scale is the real feature: one of the largest and most actively traded funds in the mortgage-bond category, which generally shows up as tighter spreads.
• Pays monthly, and the mandate stays narrow: an index of U.S. agency mortgage-backed securities, nothing exotic bolted on.
• Among the stronger builds in a thin peer group of mortgage-bond ETFs, on the combination of cost, trading friction and issuer staying power.

Worth knowing

• JMTG Index-tracking rivals are far cheaper: VMBS at 0.03% and MBB at 0.04%. Here you are paying for a manager's judgment rather than a rulebook.
• With no index to hug, results can diverge from the standard mortgage-backed benchmark in either direction.
• Monthly distributions come from mortgage pools, so the amount shifts as rates and homeowner refinancing shift. It is not a fixed coupon.

• MBB This is one slice of the bond market. Agency mortgage paper only, with no Treasuries or corporates alongside it.
• Mortgage bonds cut both ways with rates: borrowers refinance when yields fall and sit tight when they rise, so the portfolio's duration shifts underneath you.
• On price it's a photo finish: SPMB tracks the same index at the same 0.04%, and VMBS runs a basis point cheaper.

Full JMTG profile⁠

Full MBB profile⁠