SHAREHOLDER ALERT: WeissLaw LLP Investigates the SemGroup Corporation

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NEW YORK, Sept. 17, 2019 /PRNewswire/ — WeissLaw LLP is investigating possible breaches of fiduciary duty and other violations of law by the Board of the SemGroup Corporation (“SemGroup” or the “Company”) (NYSE: SEMG) in connection with the proposed merger of the Company with Energy…