1979: Unit added exploration and production to its operations and made its shares available to the public. 

1988: In early 1988, as a result of its diversifying business activity, Unit reorganized its business operation resulting in its oil and natural gas exploration operations being carried out by its wholly owned subsidiary, Unit Petroleum Company and its contract drilling service being conducted by its wholly owned subsidiary, Unit Drilling Company.

Unit settled a natural gas contract dispute with a major natural gas purchaser. This settlement allowed Unit to receive substantially higher than spot market price for natural gas sold from wells included in the agreement and provided capital to continue our reserve growth.

1991: Unit doubled its proved reserves and its company-operated producing well count in the Texas Panhandle region, one of our primary areas of interest, through a large oil and natural gas producing property acquisition.

1994: Unit completed an acquisition of producing properties in Louisiana, New Mexico, Oklahoma and Texas. The location of these properties enabled Unit to expand its oil and natural gas exploration and production operations in the Gulf Coast and Permian Basin regions. As a result of the acquisition, Unit added a new regional office in Houston, Texas.

1995: Unit's oil and natural gas reserves surpassed the 120 Bcfe mark, classifying Unit as a "mid-sized" oil and gas company. The Company's improving operations and increased visibility in the investment community resulted in several research analysts initiating coverage of Unit with "Buy" recommendations.

2000: Unit acquired Questa Oil & Gas Co. in a stock exchange for approximately 1.8 million shares of Unit common stock. At December 31, 2000, Unit reported proved reserves of 240.7 Bcfe. Unit replaced 311% of 2000 production with new reserves, achieving its stated goal of greater than 150% production replacement for the 17th consecutive year.

2004: Unit closed its acquisition of PetroCorp Incorporated in January of 2004 and gained oil and natural gas reserves of 56.7 Bcfe, consisting of 40.26 Bcf of natural gas and 2.74 million barrels of oil.

2005: In November, Unit completed an acquisition of certain oil and natural gas properties from a group of private entities. The acquisition consisted of approximately 42.5 Bcfe of proved oil and natural gas reserves located in Oklahoma, Arkansas and Texas.

2006: In May of 2006, Unit closed its acquisition of certain oil and natural gas properties from a group of private entities. Proved oil and natural gas reserves involved in this acquisition consisted of approximately 14.2 Bcfe. Approximately 45% of the reserves are located in Oklahoma, 36% are located in Texas and 19% in New Mexico.

Also in October, Unit closed its acquisition of Brighton Energy, LLC.  The acquisition includes approximately 27.0 Bcfe of proved reserves and 5.0 MMcfe per day of current production.  The majority of the reserves are located in the Anadarko and Gulf Coast basins of Oklahoma, Texas and Louisiana, with additional reserves in Arkansas, Kansas, Montana, North Dakota and Wyoming.

2010:  In June, Unit completed the acquisition of certain oil and natural gas properties from a private company.  The acquisition includes approximately 45,000 net acres and 11 producing oil wells focused on the Marmaton horizontal oil play in Beaver County, Oklahoma.  Proved developed producing net reserves for these 11 wells is approximately 900,000 Boe, consisting of 600,000 barrels of oil, 200,000 barrels of NGLs, and 700 MMcf of natural gas.

2011:  In August, Unit acquired certain producing oil and gas properties for $30.5 million in cash, subject to closing adjustments, from an unaffiliated seller.  Included in the acquisition were more than 500 wells located principally in the Oklahoma Arkoma Woodford and Hartshorne Coal plays along with other properties located throughout Oklahoma and Texas.  The proved reserves associated with the acquisition are approximately 31.2 Bcfe (99% natural gas), 83% of which is proved developed.  The acquisition also included approximately 55,000 net acres of which 96% is held by production.

2012:  Unit made the most significant acquisition of its history with the purchase of a number of properties from Noble Energy. The acquisition included 83,000 net acres located in the Granite Wash, Cleveland, and various other plays in western Oklahoma and the Texas Panhandle. The acreage was 95% held by production.

In addition, Unit also acquired a new substantial position of 105,000 net acres in the Mississippian play in northern Oklahoma and central Kansas.

2014:  Unit's oil and gas reserves exceeded a trillion cubic feet of natural gas equivalents for the first time in history. During the year, Unit announced its SOHOT play (Southern Oklahoma Hoxbar Oil Trend), which is proving to be one of its most economic plays.

Unit completed the sale of certain non-core oil and natural gas assets with proceeds of $33.1 million.

2015:  Unit attained year over year production growth of 9%, a new record for annual production. Unit completed various non-core oil and natural gas asset sales with total proceeds of approximately $37.4 million.

2017: In April, Unit announced the closing of an agreement to acquire additional oil and natural gas assets in its Hoxbar core area including approximately 8,300 net acres primarily in Grady and Caddo Counties in western Oklahoma. As of the effective date of January 1, 2017, the estimated proved reserves of the properties totaled 3.2 MMBoe, with estimated average daily net production of approximately 1,367 Boe. The acquisition increased Unit's Hoxbar total core area position to approximately 28,000 net acres.

2018: Unit acquired approximately 2.6 MMBoe proved reserves and approximately 30 potential horizontal drilling locations in the SOHOT play for just under $30 million. The acquisition includes approximately 8,667 net acres of which 82% is held by production.