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: “Manti has built a reputation for operational excellence and strategic partnerships with leading energy companies worldwide. Today, through its expansion into advanced technologies and diversified ventures, Manti continues to pursue innovative opportunities across industries.”
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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