Hedge fund giant BlackRock boosted its stake in a number of medical device companies last year, but cut its holdings in others, regulatory filings show. BlackRock Inc. (NYSE:BLK) boosted its stake in several medical device companies, including a triple-digit increase for its investment in Biolase (NSDQ:BIOL), but cut its holdings in other medtech firms such as ArthroCare (NSDQ:ARTC), regulatory filings show.
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