The phrase "main beneficiaries" refers to the people or groups who gain the most from a specific situation or event. They are the primary recipients of the benefits or advantages that come from it. Full definition
It's an issue whose main beneficiaries are poor people. (educationnext.org)
It said that the «main beneficiaries of dissatisfaction with the Conservatives» were the smaller parties. (politics.co.uk)
His two main beneficiaries at the wide receiver position had big days as well, with Thomas catching seven passes for 122 yards and a touchdown and Decker hauling in seven balls for 76 yards and two scores. (sbnation.com)