Japanese investment firm Metaplanet has adopted a new performance metric called 'BTC Yield' to evaluate its growing Bitcoin holdings.BTC Yield measures the period-over-period percentage change in the ratio between Metaplanet's Bitcoin reserves and fully diluted shares.In October, Metaplanet's BTC Yield reached an impressive 116.4%, attributed to a substantial increase in Bitcoin holdings.Metaplanet plans to release BTC Yield metrics alongside each Bitcoin purchase announcement to offer transparency on shareholder returns.