The Omaha, Nebraska-based conglomerate purchased roughly 2.3 million shares for about $54 million in separate transactions Thursday through Monday.

Warren Buffett’s Berkshire Hathaway (BRK.A) (BRK.B) has recently increased its stake in Sirius XM Holdings Inc. (SIRI), now owning over 35% of

SiriusXM disclosed that its outstanding shares stood at nearly 338.77 million in its annual 10-K report published late last month. This update reflects Berkshires increased stake in the company, rising from 34.