Provides $50.8 Million of Financing to UBM ParentCo, LLC Generates$23.8 Million Realized Gain from the Exit of Equity Investment in Mystic Logistics Holdings, LLC HOUSTON, Jan. 6, 2026 /PRNewswire/ -- Main Street Capital Corporation (NYSE: MAIN) ("Main Street") is pleased to announce that it recently completed a new portfolio investment totaling $50.8 million in UBM ParentCo, LLC, doing business as United Business Mail ("UBM" or the "Company"), to facilitate UBM's merger with Mystic Logistics Holdings, LL ...