Nvidia's stock valuation fell to pre–AI boom lows, but this strategist still isn't bullish Nvidia's stock valuation has fallen to its lowest level since 2019, but Hennion & Walsh CIO Kevin Mahn remains bearish on the company, citing concerns about its long-term prospects despite the AI boom. Hennion & Walsh chief investment officer Kevin Mahn explains to Yahoo Finance Executive Editor Brian Sozzi why he's not crazy about Nvidia NVDA https://finance.yahoo.com/quote/NVDA/ , even though the stock is at its lowest valuation since 2019. Hennion & Walsh chief investment officer Kevin Mahn explains to Yahoo Finance Executive Editor Brian Sozzi why he's not crazy about Nvidia NVDA https://finance.yahoo.com/quote/NVDA/ , even though the stock is at its lowest valuation since 2019.