Cathie Wood, head of Ark Investment Management, is known for betting on tech companies she believes can “disrupt” the future. But she doesn’t hesitate to shuffle her portfolio, sometimes trimming or adding to positions within days of making a move. That’s what she just did, selling shares of a hot tech name only a week after buying them. 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 ...