Shares of midstream energy infrastructure company SemGroup (NYSE: SEMG) shot 84.4% higher in September, according to data provided by S&P Global Market Intelligence. The move was the result of a merger agreement with midstream heavyweight Energy Transfer (NYSE: ET), which offered a whopping 65% premium to SemGroup's shares.
Unfortunately, even that big boost didn't turn SemGroup into a winner for most of its shareholders. The company's shares had been trending lower and lower this year, so the big September jump only puts shares up by 15.5% so far in 2019. Over the longer term, things are even worse: SemGroup shares have lost 78.1% of their value over the last five years, and 43.2% of their value since the company went public in 2010.
SemGroup's Houston terminal is one of its top assets. Image source: Getty Images.