Bitcoin miner Riot Platforms stepped up its acquisition strategy for rival Bitfarms this month by purchasing approximately 10 million additional shares, according to a filing with the U.S. Securities and Exchange Commission (SEC) on July 31, ChainCatcher reported.

Riot now holds 71.56 million of all outstanding shares of Bitfarms, valued at $159.1 million, or a 15.9% stake in the Canadian miner. The acquisition came shortly after the Ontario Capital Markets Tribunal ruled that Bitfarms’ initial shareholder rights plan was invalid.

With that plan scrapped and Bitfarms raising its dilution threshold from 15% to 20%, Riot took the opportunity to buy more shares in its competitor.