(Bloomberg) -- MicroStrategy Inc. bought about 51,780 Bitcoin for around $4.6 billion, the largest purchase by the crypto hedge-fund proxy since it began acquiring the digital-asset more than four years ago. Most Read from BloombergSaudi Neom Gets $3 Billion Loan Guarantee From Italy Export Credit Agency SaceThe Urban-Rural Divide Over Highway Expansion and EmissionsThe enterprise software maker, whose corporate strategy includes buying the cryptocurrency, bought the tokens between Nov. 11 and N