Palantir shares have surged 285% year to date due to encouraging financial results and growing excitement about its position in the artificial intelligence economy. However, the billionaire-run hedge funds below sold Palantir stock in the third quarter, while buying shares of the Vanguard Information Technology ETF (VGT -1.03%).Ken Griffin's Citadel Advisors sold 5.1 million shares of Palantir, slashing its stake by 91%. The hedge fund bought 14,521 shares of the Vanguard Information Technology ETF, increas ...