Brevan Howard becomes the second largest holder of the Beilide Bitcoin Trust Brevan Howard significantly increased his stake in BlackRock iShares Bitcoin Trust (IBIT), with his holdings increasing from 21.9 million shares in the first quarter to 37.5 million shares, a growth of 71%. As of June 30th, the holding value is approximately $2.3 billion, making it the second largest holder of the trust.