Expert Who Said AI Stocks Weren't Overpriced Now Says They Are

Owen Lamont at Acadian Asset Management said in January 2026 that AI stocks weren't in a bubble — a situation where prices far exceed real value. By June, Yahoo Finance reported he'd changed his mind, blaming chip-company stocks. CNBC cited his "Four Horsemen" framework on July 23 in covering new stock offerings — a warning sign he'd raised in November 2025.