No observed cheques. Organisations of this type rarely announce deals, so this says nothing about their activity.
From their own site: “Steven Rattner is the Chairman and Chief Executive Officer of Willett Advisors LLC, the investment arm for former New York Mayor Michael R. Bloomberg’s personal and philanthropic assets.”
An announcement gives the size of the round, not the size of this investor's cheque. The only rounds that imply a cheque are those where they were the sole named investor.
Something wrong here? Tell us — corrections are free and need no account.