Cathie Wood's ARK Invest offloaded some Advanced Micro Devices stock in a move that may signal to investors the well-known tech bull is switching up her strategy after a rally in chip-making stocks.

ARK sold 215,643 AMD shares across five exchange-traded funds on Friday, a daily trade notification showed. That position would have been valued at about $75 million as of the closing bell.

AMD shares fell 3% in morning trading.

ARK's other trades included loading up on shares in online retailer Amazon.com and nuclear-reactor developer X-Energy, which enjoyed a stellar trading debut on Friday.

The investment firm also trimmed its positions in Caterpillar, Rocket Lab, Teradyne, and Iridium Communications.

ARK doesn't provide commentary when it reveals its daily trades, but Wood may be taking the opportunity to lock in some profit following a stellar run for AMD stock.

Shares surged 13% on Friday following strong earnings from rival chip maker Intel. That means the stock is up 77% over the past month, driven higher by investors' hopes that the artificial-intelligence boom will continue to drive demand for semiconductors.