Ark Investment Management, founded by Cathie Wood, continued its Tesla, Inc. (NASDAQ:TSLA) buying spree on Tuesday, even as the stock struggles to make meaningful headway. The firm also accumulated a few key portfolio stocks ahead of their earnings releases. What Happened: Ark, through its flagship Ark Innovation ETF (NYSE:ARKK), added 28,684 Tesla shares valued at $5.5 million. Despite rising as much as 2.84% in early trading, the stock gave back much of its gains and settled the session up a modest 0.35% at $191.59, according to Benzinga Pro data. The firm has accumulated Tesla shares in all…