The nationโ€™s largest public pension fund, the California Public Employeesโ€™ Retirement System, recently fired off a letter to the Fortune 100 CEOs, asking them to disclose any โ€œinterested-party transactions.โ€ Specifically, the fund wants the CEOs to provide information on directors and executives who hold a financial interest in companies with which the CEOs do business. CalPERS is also wants to know which directors and officers hold an interest in companies acquired by the CEOs.