JMTG vs SPMB

JMTGBJPMorgan Mortgage-Backed Securities ETF

SPMBAState Street SPDR Portfolio Mortgage Backed Bond 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.

SPMB The no-frills way to own America's mortgage bonds. SPMB tracks the Bloomberg U.S. MBS Index for four basis points, a fraction of what the typical mortgage-bond ETF charges, and pays income monthly.

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.

SPMB The fund seeks to track, before fees and expenses, the price and yield performance of the Bloomberg U.S. MBS Index.

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.

• SPMB Four basis points a year, against a 0.35% median for mortgage-bond ETFs. Cost is where this fund does its loudest talking.
• Runs the same Bloomberg U.S. MBS Index as iShares' MBB at the same 0.04% fee, and undercuts MBBA, which tracks that index for far more.
• Roughly 2,700 mortgage bonds in a single line item, inside a multi-billion-dollar fund that trades actively, with distributions paid monthly.
• Trading since 2009, and one of the strongest implementations in its mortgage-bond peer group.

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.

• SPMB Homeowners refinance when rates fall, so mortgage bonds get paid back early and rally less than Treasuries. That quirk is built into the index, not the fund.
• Prices move with interest rates and the monthly payout floats with the portfolio. This is a bond fund, not a cash substitute.
• US mortgages only. No Treasuries, no corporates, no credit spice. A building block for a bond sleeve rather than the whole sleeve.

Full JMTG profile⁠

Full SPMB profile⁠