LMBS vs SPMB

LMBSCFirst Trust Low Duration Opportunities ETF

SPMBAState Street SPDR Portfolio Mortgage Backed Bond ETF

In short

LMBS Most mortgage-bond ETFs just clone an index. LMBS hires a manager to hunt current income across roughly 1,100 mortgage positions, keeps the duration short, and pays out monthly. Active where the category is mostly autopilot.

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

LMBS The fund is actively managed and primarily seeks current income, with capital appreciation as a secondary objective.

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

• LMBS Actively managed, not index-bound: the team pursues current income first, with capital appreciation as a secondary goal, so the mix reflects live judgment on mortgage paper.
• Income arrives monthly rather than quarterly, spread across roughly 1,100 bond positions instead of a handful of big-ticket holdings.
• Multi-billion-dollar fund that trades actively, so getting in and out is generally straightforward rather than a hunt for a counterparty.
• Running since 2014, giving the active approach a decade-plus history through a full swing in interest rates.

• 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

• LMBS Active talent is not cheap: 0.66% a year against a 0.35% median for mortgage-bond ETFs, while index rivals VMBS (0.03%) and MBB (0.04%) charge a rounding error.
• No benchmark to lean on. What you own shifts with the manager's calls on which mortgage bonds to hold, which is the whole point and the whole risk.
• This is a focused mortgage-bond sleeve, not a broad core bond fund, so the exposure stays concentrated in one corner of the credit market.

• 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 LMBS profile⁠

Full SPMB profile⁠