No observed cheques. Organisations of this type rarely announce deals, so this says nothing about their activity.
From their own site: “Founded by Mark Mitchell in 2015, the Mitchell Family Office has a proven track record of success originating in the healthcare sector and expanding into a rich diversified portfolio ranging from auto to luxury hospitality.”
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.
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