Scott Arnold, a former trader at hedge fund Marshall Wace, is claiming entitlement to profits from the fund's early investment in Circle Internet Financial, a stablecoin issuer. Arnold asserts he led the investment initiative, which saw Marshall Wace invest approximately $200 million in Circle, acquiring over 8.5 million shares, or about 4% of the company, prior to its listing on the New York Stock Exchange on June 5. This investment is anticipated to be among the fund's most lucrative trades.