Warren Buffett’s Berkshire Hathaway has spent another $54 million to purchase Sirius XM stock, giving it a stake of more than 35% in the satellite-radio company.

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

Berkshire Hathaway has compounded shareholder capital at nearly 20% annually since the 1960s. It all comes down to capital allocation, something the great Warren Buffett, longtime CEO of Berkshire, is great at.