** Shares of DT Midstream DTM.N, an operator of natural gas pipelines, down 3% after market
** Co to buy three natural gas transmission pipelines from ONEOK OKE.N for $1.2 bln
** Deal will be financed via a combination of equity and debt, DTM says
** OKE shares flat in extended trade
** DTM shares have gained 86% YTD, while OKE is up 60%
(Reporting by Niket Nishant in Bengaluru)
((Niket.Nishant@thomsonreuters.com))