Billionaire investor David Tepper, through Appaloosa Management, sent a strongly worded letter to Whirlpool's board, accusing the appliance maker of destroying shareholder value.

Quant ratings provide insights into Appaloosa Management's key holdings, including Alibaba, Google, and Nvidia.

Billionaire investor David Tepper significantly increased his stake in Micron, while Appaloosa Management upped its bets on American Airlines and various tech companies during the fourth quarter.