Quintana Energy Services Inc. (either individually or together with its subsidiaries, as the context requires, the "Company," "QES," "we," "us," and "our") is a Delaware corporation that was incorporated on April 13, 2017. Our accounting predecessor, Quintana Energy Services LP ("QES LP" and "Predecessor"), was formed as a Delaware partnership on November 3, 2014. In connection with our initial public offering (the "IPO") which closed on February 13, 2018, the existing investors in QES LP and QES Holdco LLC contributed all of their direct and indirect equity interests to QES in exchange for shares of common stock in QES, and we became the holding company for the reorganized QES LP and its subsidiaries.
We are a growth-oriented provider of diversified oilfield services to leading onshore oil and natural gas E&P companies operating in conventional and unconventional plays in all of the active major basins throughout the United States. We classify the services we provide into four reportable segments: (1) Directional Drilling, (2) Pressure Pumping, (3) Pressure Control and (4) Wireline. Our Directional Drilling segment enables efficient drilling and guidance of the horizontal section of a wellbore using our technologically-advanced fleet of downhole motors and 115 MWD kits. Our Pressure Pumping segment includes hydraulic fracturing, cementing and acidizing services, and such services are supported by a high-quality pressure pumping fleet of approximately 267,500 HHP as of December 31, 2018. Our primary pressure pumping focus is on large hydraulic fracturing jobs. Our Pressure Control segment provides various forms of well control, completions and workover applications through our 24 coiled tubing units (10 of which are Large Diameter units), 36 rig-assisted snubbing units and ancillary equipment. As of December 31, 2018, our wireline services included 41 wireline units providing a full range of pump-down services in support of unconventional completions, and cased-hole wireline services enabling reservoir characterization.
Our operations are diversified by our broad customer base and expansive geographical reach. We currently operate throughout all active major onshore oil and gas basins in the United States and we served approximately 1,100 customers as of December 31, 2018. We have cultivated and maintain strong relationships with our E&P company customers, including leading companies such as EOG Resources, Parsley Energy, Matador Resources, Pioneer Natural Resources, Seneca Energy, Triumph Energy Partners and XTO Energy.