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Lyndal Stephens Greth
Summary
Lyndal Stephens Greth is the daughter of Autry C. Stephens, who founded Endeavor Energy Resources in 1979 and built it into one of the largest privately held oil producers in the United States. She joined Endeavor's board in 2013 and became chairwoman after her father's death in August 2024, overseeing the closing of the company's $26 billion sale to Diamondback Energy the following month.
She remains one of Diamondback's largest individual shareholders and is director and executive chairman of the Stephens Greth Foundation, the family's philanthropic vehicle established with proceeds from the sale.
Ownership
Greth served as vice chair of Endeavor Energy Resources' board before succeeding her father as chair upon his death in August 2024, and held that role until the $26 billion sale to Diamondback Energy closed the following month. Since then, an investment vehicle for Greth, SGF FANG Holdings, has sold down her Diamondback stake from roughly 34% to 26.3% through a series of sales, including $2.15 billion in shares sold in March 2026 and a further 10 million shares for about $2.04 billion sold in June 2026. She is director and executive chairman of the Stephens Greth Foundation, the family's $2 billion private foundation established in 2024, where she was the sole listed officer -- holding the director, president, secretary and treasurer roles simultaneously -- according to its initial tax filings.
Family & Heirs
Greth is the daughter of Autry C. Stephens, who founded Endeavor Energy Resources in 1979 and built it into the country's largest closely held oil producer before his death in August 2024 at age 86. She succeeded him as chair of Endeavor's board, having served as a board member since 2013. Her mother, Linda Stephens, was listed as an Endeavor owner but was not involved in day-to-day operations, and her brother, Joseph Martin Stephens, was not involved in the company.
Evidence
2025-09-03 - 😈 - Endeavor Energy Resources received more than half of Texas' approved permanent flaring exemptions, including a 17-year permit approved without shortening
2025-10-09 - 😇 - The Stephens Greth Foundation gives $8 million to the SPCA of Texas' campus expansion; the reimagined campus is named for the foundation
2025-11-03 - 😇 - The Stephens Greth Foundation funds the naming gift for UT Austin's Autry C. Stephens Engineering Discovery Building
2025-11-03 - 😇 - Lyndal Stephens Greth says no employees were laid off when Endeavor Energy Resources was sold to Diamondback Energy
2026-04-01 - 😇 - The Stephens Greth Foundation gives $100 million to UT Southwestern Medical Center and Children's Health for a new pediatric campus
Analysis
During Greth's tenure on Endeavor Energy Resources' board, the company was among the largest beneficiaries of Texas' lax flaring-exemption process: a 2025 ProPublica investigation found Endeavor received more than half of the state's approved permanent flaring exemptions, including a 17-year permit the Railroad Commission approved without shortening its duration. Flaring releases both toxic pollutants near populated areas and methane, a greenhouse gas roughly 80 times more potent than carbon dioxide at warming the atmosphere over a 20-year span.
Greth's philanthropic record, concentrated in the two years since her father's death, has been substantial. The Stephens Greth Foundation committed $100 million toward a new pediatric campus at UT Southwestern Medical Center and Children's Health in April 2026, funded the naming gift for a new engineering building at her father's alma mater, UT Austin, in November 2025, and gave $8 million to the SPCA of Texas' campus expansion the same year. She has also said that no employees were laid off when Endeavor was sold to Diamondback.
Questions
Because Greth's public profile is barely two years old -- she gained board control only after her father's August 2024 death -- it is unclear whether the flaring practices ProPublica documented reflect decisions made during her chairmanship or ones made earlier, when she was one of several board members under her father. It is also unclear how the newly formed, invitation-only Stephens Greth Foundation will allocate the remainder of its endowment beyond the gifts made so far.