By Dan Weil Asset manager Cathie Wood bulked up on — and also sold — several stocks that already were among her top holdings. Renowned investor Cathie Wood, chief executive of Ark Investment Management, on Wednesday bought Roku (ROKU) – Get Roku, Inc. Class A Report and other of her technology stalwarts — and added a smart-glasses company. She also sold two big names. (All valuations listed below are as of Wednesday’s close.) Ark exchange-traded funds purchased 375,524 shares of streaming platform Roku, valued at $41.1 million. Roku is the second biggest holding in Wood’s flagship fund, Ark…