No observed cheques in the sources we track. That is a limit of our coverage, not a finding about this organisation.
From their own site: “we founded Riese & Others in 1998 to provide strategic consulting, board and advisory services to enterprises globally and to provide a vehicle for our investments in early and growth stage companies.”
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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