Institutional investment managers with at least $100 million in equity assets under management filed 13F reports with the U.S. SEC this past week. These reports are required to be filed within 45 days after the end of each quarter to understand managers' stock holdings. The following data represents holdings as of September 30, and no short positions are disclosed. 13f.info data shows that the number of institutional holders of MicroStrategy stock jumped from 667 to 738, with a total value of $15.3 billion. Vanguard Group and Capital International Investors, the world's second-largest asset management company, each bought nearly 16 million shares of MicroStrategy in Q3, with their holdings increasing by about 1,000%. Investment banking giant Morgan Stanley bought 8 million shares, a 500% increase from the previous quarter. Goldman Sachs and Bank of America bought smaller amounts (696,000 and 766,00 shares, respectively), but this followed up on big purchases in the previous quarter. Meanwhile, State Street and Susquehanna also bought 5.3 million shares of MSTR. It is worth noting, however, that these holdings are relatively insignificant compared to the large holdings of these companies. For example, Vanguard holds 800 million shares of Amazon. MicroStrategy stock closed at $384 per share that day, with a market value of $78 billion. (The Block)