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TRANSACTION AGREEMENT dated as of May 15 , 2021 by and among CLARIVATE PLC , CAMELOT UK BIDCO LIMITED , MILLENNIUM RESEARCH GROUP INC . , CLARIVATE SCIENCE HOLDINGS CORPORATION , CLARIVATE US SCIENCE HOLDINGS CORPORATION , PROQUEST HOLDINGS LLC , PROQUEST LLC , PROQUEST HOLDINGS CANADA LLC , CAMBRIDGE INFORMATION GROUP , INC . CAMBRIDGE INFORMATION GROUP I LLC , CSA GP CORPORATION , A - PQ HOLDINGS , LLC , CAMBRIDGE INFORMATION GROUP III LLC , in its capacity as the Equityholders ' Representative , and THE OTHER PARTIES SIGNATORY THERETO Exhibit 2.1 CONFIDENTIAL EXECUTION VERSION