Japanese investment firm Metaplanet Inc. acquired 696 BTC using cash-secured put options.The total Bitcoin holdings of Metaplanet now stand at 4,046 BTC, valued at approximately $340 million.Metaplanet aims to accumulate 10,000 BTC in 2025 and 21,000 BTC in 2026.Metaplanet's share price experienced volatility, falling 9% before recovering by 2%.