By Dan Weil Wood’s flagship Ark Innovation ETF has fallen 52% this year as technology companies have tumbled. Renowned investor Cathie Wood, chief executive of Ark Investment Management, on May 26 bought into one of the world’s biggest and most prominent semiconductor makers, for the first time in at least several months. Ark also purchased an organ-transplant-services firm along with some familiar names. All valuations below are as of Thursday’s close. Ark funds snagged 245,286 shares of graphics-chip specialist Nvidia (NVDA) – Get NVIDIA Corporation Report, valued at $43.8 million. In its ea…