U.S. Well Services Holdings, LLC is the principal operating subsidiary of U.S. Well Services, Inc. (Nasdaq: USWS), an oilfield services company focused on hydraulic fracturing in North American unconventional basins. The entity reached public markets through a business combination with Matlin & Partners Acquisition Corporation (MPAC), a SPAC sponsored by MatlinPatterson Global Advisers that completed its IPO in 2016 targeting the energy sector. The merger closed in November 2017, and the holding company filed this 10-Q with the SEC on May 4, 2018, its first full quarterly report as a post-combination public entity in the oil and gas field services industry. Sign up for SpacDesk to access complete filing histories, deal timelines, and sponsor data across thousands of SPAC transactions.