If the 10-Year Treasury Crosses 4.6%, Here's What Happens to VOO and IVV

"With nearly 70% of advisors now using model portfolios built on ETFs, VOO, IVV, and VTI are the rails that mechanical 401(k) and rebalancing flows ride into the market. Each charges 3 basis points, each defaults into model portfolios, and each is up roughly 6% year to date."

"VOO holds $839 billion in net assets and has compounded to a 28% one-year return and 313% over ten years. IVV mirrors it almost exactly, posting a 28% one-year return on the same S&P 500 basket. VTI, which tracks the CRSP US Total Market Index and includes mid- and small-caps, is up 27% over the past year and 237% over ten."

"The single variable most likely to swing 2026 returns is the Fed's rate path. The upper bound sits near 3.8% after 75 basis points of cuts from the September 2025 peak around 4.5%. The 10-year Treasury is near 4.4%, in the 82nd percentile of the past year despite the easing."

State Street's 2026 Global ETF Outlook forecasts $2.1 trillion in US ETF inflows, with three core funds—Vanguard S&P 500 ETF (VOO), iShares Core S&P 500 ETF (IVV), and Vanguard Total Stock Market ETF (VTI)—capturing the lion's share. All three charge 3 basis points and are integrated into model portfolios used by nearly 70% of advisors. VOO holds $839 billion in assets with 28% one-year and 313% ten-year returns. IVV mirrors S&P 500 performance identically, while VTI tracks the broader market including mid- and small-caps. The Federal Reserve's rate path represents the primary variable affecting 2026 returns, with the 10-year Treasury near 4.4% and potential inflation stickiness posing risks to growth-heavy mega-cap holdings.

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