Japanese investment firm Metaplanet has purchased 156 BTC worth $13.4 million, increasing its Bitcoin holdings to 2,391 BTC.Metaplanet aims to hold 10,000 BTC by 2025 and 21,000 BTC by 2026 as part of its long-term Bitcoin accumulation strategy.Metaplanet's CEO confirmed talks with the NYSE and Nasdaq regarding worldwide expansion.The company's portfolio now amounts to $196.3 million, with an average cost basis of $82,100 per BTC.