Strategy, formerly known as MicroStrategy Inc., disclosed Monday that it bought $2.46 billion of Bitcoin in the past week—its third-largest purchase by dollar value since it began accumulating the cryptocurrency five years ago. 

The company acquired 21,021 tokens between July 28 and Aug. 3, pushing its total holdings to 628,791 Bitcoin, according to a filing with the U.S. Securities and Exchange Commission. This takes the value of the company’s Bitcoin holdings to more than $71 billion at current prices.

Fueled by a steady stream of stock offerings and debt deals, Saylor has transformed his enterprise software company into the dominant corporate buyer of Bitcoin. Its latest acquisition came at an average price of $117,526 per token, the second-highest price Strategy has ever paid, just behind the $118,940 average last month, according to company data.

The move underscores how Saylor has turned public-company finance into a specialized vehicle to amass Bitcoin—and how Strategy keeps buying even as prices hover near record levels. Strategy is by far the largest corporate holder of Bitcoin, according to a tally by BitcoinTreasuries.net, and has spurred a new industry of public companies following a so-called treasury strategy dedicated to buying and holding cryptocurrencies.

To fund the purchases, Saylor has employed a combination of common and preferred share sales, as well as debt. The company offers four different kinds of securities to investors—launching its latest preferred stock offering, dubbed Stretch, in late July. Strategy reported an unrealized gain of $14 billion in the second quarter, driven by a rebound in Bitcoin’s price and a recent accounting change that required the company to revalue its Bitcoin holdings.

Saylor recently promised he won’t issue new common shares at less than 2.5 times its net asset value, except to cover debt interest or preferred dividends. This comes after critics like Jim Chanos voiced concerns on the premium Strategy’s Bitcoin holdings have on its share price and the many security offerings the company offers.

Strategy’s stock has surged more than 3,000% since its first crypto purchase, outpacing Bitcoin itself as well as major stock indices like the S&P 500 and Nasdaq 100. Its first and second largest purchases came in November last year totaling $5.4 billion and $4.6 billion, according to company data.