CMBS vs VMBS

CMBSCiShares CMBS ETF

VMBSAVanguard Mortgage-Backed Securities ETF

In short

CMBS The index route into commercial mortgage bonds: debt on offices, hotels, malls and apartment blocks rather than home loans. Running since 2012, screened to investment-grade, top-of-the-waterfall slices.

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

CMBS The fund seeks to track an index composed of U.S. investment-grade commercial mortgage-backed securities.

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

• CMBS The index takes only ERISA-eligible tranches with first priority of principal repayment, rated in one of the three highest categories, plus minimum deal and tranche sizes.sec.gov
• 0.25% a year sits under the 0.30% median fee for mortgage-bond ETFs, notable for a corner of the market this specialized.
• Roughly 500 bond positions, monthly distributions, and a track record going back to its 2012 launch.
• Single mandate, clearly stated: track an index of U.S. investment-grade commercial mortgage-backed securities. No credit tourism, no off-benchmark detours.ishares.com

• 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

• CMBS Thinly traded next to the agency-MBS giants in its category, so the spread you pay and the order type you use matter more here.
• Cheap for a niche, still not cheap outright: agency-mortgage peers VMBS and SMBS run 0.03%, so broad mortgage exposure costs a fraction of this.
• BlackRock flags prepayment and extension risk on these bonds, and notes small interest-rate moves can sharply cut the value of certain mortgage securities.ishares.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 CMBS profile⁠

Full VMBS profile⁠