The iShares MBS ETF (MBB) saw recent returns from price appreciation as mortgage spreads tightened, with the 4% yield playing a secondary role. MBB manages $39B with a 0.04% expense ratio, showing monthly swings during rate volatility. Vanguard Mortgage-Backed Securities ETF (VMBS) offers lower fees at 0.03%, saving $3K over 30 years with a $100K allocation.

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MBB’s success lies in price appreciation from interest rate movements, not just its 4% yield. The fund’s exposure to agency mortgage-backed securities provides government guarantees and eliminates credit risk, focusing on interest rate sensitivity and prepayment risk. MBB’s scale allows for a low 0.04% expense ratio, ensuring more income flows through to investors.

Duration risk impacts MBB’s performance, showing strength in recent periods but facing challenges during rate spikes. Prepayment risk also affects returns, as homeowners refinance when rates fall, reducing future income potential. Investors with short horizons or seeking capital preservation may find MBB’s volatility unsettling.

MBB is best suited for investors seeking core bond holdings that understand the dynamics of mortgage-backed securities. Cost-conscious investors may consider Vanguard’s VMBS, which charges 0.03% annually and can save $3K in fees over 30 years with a $100K allocation. MBB serves as a diversification tool rather than a wealth-building investment for growth-focused investors.

Read more at Yahoo Finance: The 4.5% Yield Is Only Half The Story