Upstream Energy Services is a natural gas and oil marketing company based in Houston that has served over 100 exploration and production clients across North America since 1995. The company specialises in natural gas marketing, NGL (natural gas liquid) marketing, and crude oil marketing, using a value-added approach to help clients achieve the best market prices and manage their assets effectively. They also offer the Mansfield Analytics Portal to provide market intelligence and client-specific reports. Upstream Energy Services would suit businesses looking to outsource their oil and gas marketing functions, or those needing support with asset valuation and operator transitions.