Activist investor Jeffrey Smith had a new top holding in the third quarter

Jeffrey Smith, chief executive officer and chief investment officer at Starboard Value LP.
David Paul Morris | Bloomberg | Getty Images

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Activist investor Jeffrey Smith revealed the size of one of the recent bets for his Starboard Value hedge fund in a securities filing, which also showed the fund building its stake in an engineering stock.

Starboard managed $5.5 billion in assets as of 2019. Here's a look at the fund's biggest holdings at the end of September, including a new top holding.