Strategy, the bitcoin treasury company led by executive chairman Michael Saylor, purchased another 17,994 bitcoin for about $1.28 billion last week, continuing one of the largest corporate accumulation strategies in the digital asset market.

The company disclosed in a filing with the U.S. Securities and Exchange Commission that the purchases took place between March 2 and March 8 at an average price of $70,946 per coin. The acquisition brings the firm’s total holdings to 738,731 bitcoin.