San Antonio-based Abraxas Petroleum Corporation is a noteworthy independent energy company, committed to the acquisition, exploration, exploitation, development, and production of oil and gas properties throughout the US. The company boasts a strong presence in the Permian/Delaware Basin and Rocky Mountain regions, making it a key player in those areas. Established in 1977, Abraxas Petroleum Corporation has exhibited impressive longevity in a constantly-evolving market.