This makes D.E. Shaw the second activist investor to take a position in the company. The exact size of D.E. Shaw's stake in Riot Platforms remains undisclosed, the report said.

D.E. Shaw's purchase of a stake comes after Starboard Value late last year took an undisclosed position in Riot, which processes bitcoin transactions and receives the cryptocurrency as payment.

For $50 billion quant fund D.E. Shaw, that means giving its biggest investor - private equity giant Blackstone -preferential treatment, according to several sources inside the manager. Blackstone ...

Multi-strategy hedge fund D.E. Shaw nominated three directors to Air Products and Chemical's board, and is pushing for the company to return to historically successful business practices.