LSE rejected the bid on Friday in favour of an agreed $27 billion deal with Refinitiv, in which Thomson Reuters has a minority stake.

RLAM, a top 30 LSE shareholder with 3.3 million shares, equivalent to a 0.95% stake according to Refinitiv data, said it continued to back the Refinitiv deal.

"The risk of the HKEX deal not completing, and the high level of shares in the consideration offered, do not compensate for the lost potential of a combination between London Stock Exchange Group and Refinitiv,” said Mike Fox, head of sustainable investments at RLAM.

(Reporting by Simon Jessop; editing by Huw Jones)