According to CoinMarketCap, Michael Saylor's company purchased 8,178 BTC for $835.6 million last week at an average price of $102,171 per coin (source: CoinMarketCap). The report states total holdings now stand at 649,870 BTC, valued around $61.7 billion (source: CoinMarketCap). This establishes a clear tranche cost basis at $102,171 for the latest accumulation and confirms a week-over-week net addition of 8,178 BTC to corporate holdings (source: CoinMarketCap).