MBSD vs VMBS

MBSDBNorthern Trust Disciplined Duration MBS ETF

VMBSAVanguard Mortgage-Backed Securities ETF

In short

MBSD Agency mortgage bonds let their duration wander as homeowners refinance or sit tight. MBSD tracks an index built to keep that drift on a leash, offering mortgage-bond exposure with rate sensitivity set by rules instead of by the market's mood.

VMBS The plumbing of the U.S. housing market in one ticker: pooled home loans from Ginnie, Fannie and Freddie, tracked by index for 0.03% a year, with income paid monthly.

Stated mandate

MBSD The fund is designed to provide market-like exposure to mortgage-backed securities while limiting duration drift through a rules-based index methodology.

VMBS The fund seeks moderate and sustainable current income by investing primarily in U.S. agency mortgage-backed pass-through securities issued by GNMA, FNMA, and FHLMC.

Why people hold it

• MBSD The whole point is duration discipline: a rules-based index designed to give market-like mortgage-bond exposure while limiting duration drift, so rate sensitivity is governed by methodology.flexshares.com
• Charges 0.21% a year, less than the typical fee in the MBS ETF group, and it has been running since 2014 rather than arriving as a recent idea.
• Spreads across roughly 500 mortgage bonds and pays monthly, so income lands on a mortgage-payment rhythm instead of twice a year.

• VMBS 0.03% a year is the cheap end of the mortgage-bond aisle: SPMB and MBB charge 0.04%, JMTG 0.24%, and the typical peer runs far higher.
• Agency pass-throughs from GNMA, FNMA and FHLMC. Credit isn't the main variable here; rates and mortgage behavior are.vanguard.com
• Trading since 2009, a multi-billion-dollar fund holding roughly 300 pools and paying monthly. Boring in the way bond ballast is supposed to be.
• Sits in the top quartile of its mortgage-bond peer group, one of the stronger builds in a crowded, look-alike category.

Worth knowing

• MBSD Thinly traded. Spreads and limit orders matter more here than with the category's household names.
• Duration control carries a price tag: VMBS, MBB and SPMB track the broad agency mortgage market for single-digit basis points.
• Constraining duration means it is not built to move like the full mortgage-backed market. That is the design, but it is a different exposure, not a copy.flexshares.com

• VMBS Mortgages don't keep a schedule. Homeowners refinance when rates fall, returning cash to reinvest at lower yields; when rates rise, payoffs slow and bonds stretch out.vanguard.com
• The mandate is current income from one slice of the bond market. No Treasuries, no corporates, no equity kicker.
• Share prices move with interest rates, so this behaves like a bond fund, not a cash parking spot.vanguard.com

Full MBSD profile⁠

Full VMBS profile⁠