Citadel founder Ken Griffin has been added to a list of entities subpoenaed by Twitter as the social media firm looks to force Tesla founder Elon Musk to complete his $44 billion purchase of the business.

Citadel founder Ken Griffin has been added to a list of entities subpoenaed by Twitter as the social media firm looks to force Tesla founder Elon Musk to complete his $44 billion purchase of the business.

Subpoena filings in Delaware Chancery Court are addressed top Griffin rather than Citadel, although the hedge fund has in the past owned shares in both Twitter and Tesla. The filings refer to Griffin as "an actual or potential' co-investor in the financing of the acquisition.

Twitter is seeking information from over a dozen investment firms that committed to equity to Musk's proposed purchase as well as banks that advised Musk and promised to provide financing.

Musk meanwhile, has requested records from Twitter’s deal advisers, Goldman Sachs and JPMorgan Chase ahead of the 17 October trial date which could see Musk forced to complete the acquisition.