Chief Investment Officer and Head of Quantitative and Strategic Equity, Vanguard Portfolio Management
John Ameriks is chief investment officer of Vanguard Portfolio Management, one of the two advisers that now run Vanguard's U.S. funds, and heads its quantitative and strategic equity group.
Vanguard said in January 2026 that it had finished moving its U.S. fund management into two wholly owned advisers. Within Vanguard Portfolio Management, Ameriks oversees the in-house quantitative strategies and the U.S. sector and style-box equity index funds. The adviser's Form ADV lists him as a manager and its chief investment officer from December 2025.
Ameriks joined Vanguard in 2003 from the TIAA-CREF Institute, where he was a senior research fellow, and has worked in investment management since 1996. Before the reorganisation he was a principal of Vanguard and global head of its Quantitative Equity Group, which runs active, multi-asset and factor-based mandates using quantitative methods; in July 2022 he also became a portfolio manager of Vanguard Global Minimum Volatility Fund.
He is a published economist. His papers on household saving, retirement and financial decision-making have appeared in the American Economic Review, the Quarterly Journal of Economics and the Journal of Political Economy. Vanguard Portfolio Management reported $2.22 trillion of U.S.-listed securities in its 13F filing for June 30, 2026.
Sources · written 23 October 2026