Cathie Wood, chief of Ark Investment Management, usually targets U.S. tech companies. But she occasionally turns to overseas bets to balance her portfolio. That’s what she just did, buying into two popular Chinese tech stocks that have been surging over the past month. Wood’s funds have experienced a volatile ride this year, swinging from sharp losses to strong gains. In January and February, the Ark funds rallied as investors bet on the Trump administration's potential deregulation that could benefit W ...