...- Dallas-based midstream energy partnership Energy Transfer LP (ET) has executed a definitive agreement to acquire SemGroup Corp. (SEMG) for $17 per share. The merger consideration of about $5 billion consists of 40% cash ($6.80 per SEMG share) and 60% ET common units. - We expect that the SEMG assets will go to Energy Transfer Operating LP (ETO) at transaction close, in the first quarter of 2020. - We are affirming our '###-' issuer credit ratings on ET. - We are also affirming the '###-' issuer credit ratings and senior unsecured issue-level ratings on operating subsidiaries ETO, ETP Legacy LP, Sunoco Logistics Partners Operations LP, Panhandle Eastern Pipe Line Co. LP, and Regency Energy Partners LP. - The stable outlook on ET reflects our belief that the combined company's credit measures will be acceptable for the rating, and that the robust distribution coverage ratios of almost 2x will provide the partnership with financial flexibility and funding certainty and help strengthen the...