Bill Ackman's hedge fund Pershing Square will disclose a new position in Microsoft later in the day, the billionaire investor said on Friday, arguing that the tech giant sits at a "highly compelling valuation". Ackman's new closed-end fund Pershing Square USA, which debuted on the NYSE last month, has also recently made Microsoft a core holding, he said in a post on social media platform X. Pershing's bet on Microsoft comes amid Ackman's growing appetite for tech holdings.