If I understand correctly, Platts tried to buy OPIS on 2010 and was forced not to, later standalone IHS bought OPIS in 2016, and now IHS Markit is selling it to be able to merge with S&P Global. S&P owned Platts does not need to sell anything 
MERGER MONDAY! News Corp buying OPIS from IHS Markit for $1.15 billion in cash. Dow Jones information services biz getting a big upgrade & $SPGI x $INFO deal gets closer to approval:
https://investors.newscorp.com/node/10776/pdf pic.twitter.com/hN4d9dtalH
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