Billionaire investor William Ackman built new stakes in sportswear company Nike and investment management company Brookfield during the second quarter, according to a regulatory filing made on Wednesday.This marks the first new investments for Pershing Square – which oversees roughly $17 billion in assets – since the firm put money into Google parent Alphabet during the first quarter of 2023.The filing shows that Ackman’s hedge fund Pershing Square Capital Management owned roughly 3 million shares of Nike a ...