Japanese listed company Metaplanet announced today that it has increased its holdings by 619.7 BTC, making its Bitcoin holdings the twelfth largest among listed companies, second only to medical technology manufacturer Semler Scientific. Metaplanet reported that from October 1 to December 23, its BTC yield was 310%, significantly higher than the 41.7% from July to September. Metaplanet uses BTC yield to 'evaluate the performance of its Bitcoin acquisition strategy, which aims to bring value to shareholders.' According to Google Finance data, Metaplanet's stock price rose by 5% after this announcement, but it has still fallen nearly 13% over the past week. However, due to the company's Bitcoin strategy, its stock price has surged over 2,100% this year and reached an all-time high of 4,080 yen ($26) on December 17. (Cointelegraph)