Last week's purchases were mostly funded via sales of the company's STRC preferred stock.

What to know:

• Strategy bought 4,871 bitcoin for about $329.9 million last week at an average price of $67,718 per coin.

• The company has spent roughly $58.02 billion on its bitcoin at an average cost of $75,644 per coin, leaving it with about $5 billion in unrealized losses at current prices.

• With 766,970 BTC, Strategy controls about 3.8 percent of bitcoin's circulating supply.

Michael Saylor's Strategy (MSTR) added 4,871 bitcoin to its treasury over the past week at an average price of roughly $67,718 per coin, spending approximately $329.9 million, according to a Monday filing.

The purchase brings total holdings to 766,970 BTC acquired for $58.02 billion at an all-in average cost basis of $75,644. At bitcoin's current price near $69,120, the entire position is underwater by roughly 8%, or about $5 billion in unrealized losses on paper.