By Dan Weil Ark also bulked up on biotech stocks. All the stocks Wood bought and sold have slumped over the past six months. Investment manager Cathie Wood, chief executive of Ark Investment Management, was active buying and selling big-name technology stocks on Monday. She also continued her foray into the biotechnology sector. (All valuations are as of Monday’s close.) Ark Fintech Innovation ETF (ARKF) – Get ARK Fintech Innovation ETF Report bought 32,635 shares of e-commerce stalwart Shopify (SHOP) – Get Shopify, Inc. Class A Report, valued at $22.3 million. The stock has dropped 52% over t…