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: “Grindstone is a structured entrepreneurship development programme that assists high-growth innovation-driven companies to get the fundamental building blocks in place to scale quickly and become sustainable and fundable.”
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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