Japan-based investment firm Metaplanet has acquired an additional $7 million worth of Bitcoin, increasing its holdings to a total of $40.5 million.Metaplanet has been aggressively purchasing Bitcoin since May 2024 and has invested 6 billion Japanese yen in the cryptocurrency.The company's stock price surged by 11% following the recent Bitcoin acquisition and has gained 544% year-to-date.In addition to direct purchases, Metaplanet is using options trading to increase its reserves, generating additional revenue of 23.97 BTC.