Bill Ackman's Pershing Square took a big hit to its stock portfolio during the coronavirus sell-off. The billionaire's hedge fund saw its stakes in Hilton, Burger King-parent Restaurant Brands, Lowe's, and Berkshire Hathaway tumble in value by upwards of 20% last quarter. Ackman took advantage of the share-price declines to boost Pershing's holdings in all four companies and reinvest $720 million in Starbucks. Pershing's stakes in Lowe's, Starbucks, and Berkshire Hathaway are worth more now than in December. Visit Business Insider's homepage for more stories. Billionaire Bill Ackman's favorite stocks were pummeled by the novel coronavirus sell-off.