Goldman Sachs reiterated its ratings for several companies, including:Columbia Pipeline Partners LP : NeutralTC Pipelines, LP : NeutralTransCanada Corporation (USA) : BuyAt the time of writing, Columbia Pipeline Partners was trading at $15.76 (down 57 percent), while TC Pipelines was trading at $55.38 (up 0.54 percent). TransCanada Corporation, trading at $46.25 (down 0.56 percent), represents the only Buy-rated company in the list, which was also upgraded to Buy in March from Citigroup.