The reassignment of director candidates for the audit, nominating and compensation committees follows an explosive shareholder-commissioned investigation that accused Toshiba and the government of colluding to pressure foreign investors.
Satoshi Tsunakawa, who led the company before Kurumatani and until Wednesday was chairman, will once again assume the helm.
The offer sparked a strong backlash from Toshiba managers, prompting them to lobby against it to the government, said one of the sources. The sources declined to be identified due to the sensitivity of the matter.
In a statement welcoming the result, Effissimo said independent investigators will have "a broad mandate" to examine last year's AGM, and Toshiba's directors and executives have a legal obligation to cooperate.