In the context of the input sentence, determine the relationship between 'Russell Investments' and 'London Stock Exchange Group'.
Options: parent organization, owned by, manufacturer, chief executive officer

July 9 (Reuters) - China's CITIC Group Corporation is in negotiations to acquire Russell Investments from London Stock Exchange Group Plc in what is expected to be a roughly $1.8 billion deal, according to people familiar with the matter.
parent organization