No observed cheques. Organisations of this type rarely announce deals, so this says nothing about their activity.
From their own site: “Ridgeback Capital is an actively managed private investment company that specializes in both securities trading and long-term private investment, with a specialized focus on investing in life science 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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