Wall Street giant Morgan Stanley might now be the largest institutional holder of the world’s biggest Bitcoin ($BTC) fund- the Grayscale Bitcoin Fund (GBTC). According to Regulatory filings seen by Blockworks, Morgan Stanley now owns more than 13 million GBTC shares across 17 different portfolios, worth over $345 million. Whereas, the Ark Invest now holds 6.163 million GBTC shares, worth nearly $160 million.