Lyndal Stephens Greth
American oil heiress; former chair of Endeavor Energy Resources; controls the Stephens family stake in Diamondback Energy
| Lyndal Stephens Greth
| |
|---|---|
| Born | 12 10 1974 (age 52 years old (as of 2026)
) (Forbes) |
| Residence | Dallas, Texas (Forbes) |
| Known for | Former chair of Endeavor Energy Resources; Stephens family holding in Diamondback Energy |
| Parents | Autry Stephens (died 2024) |
Lyndal Stephens Greth (born 1974) is an American heiress to the Endeavor Energy Resources oil fortune. Endeavor was founded by her father, Autry Stephens, in the Permian Basin of Texas.[1][2] Diamondback Energy bought Endeavor in September 2024, and she now controls the Stephens family trusts and companies that received Diamondback shares in the deal. In September 2026 they held 23.2% of Diamondback.[3][4] On 20 October 2026 the Forbes Real-Time Billionaires list ranked Lyndal Stephens Greth & family 73rd in the world, with an estimated net worth of US$30.29 billion; Forbes lists the source of wealth as Oil & gas.[1][5] In the annual World's Billionaires list published in 2026, Forbes had ranked Lyndal Stephens Greth 77th, at US$30 billion.[6]
Endeavor Energy Resources
Diamondback's announcement of the merger in February 2024 described Endeavor as one of the largest private oil companies in the United States. It said Endeavor had about 344,000 net acres in the core of the Midland Basin and produced more than 353,000 barrels of oil equivalent a day. Autry Stephens had founded the company 45 years earlier, and Lance Robertson had been chief executive since 2020.[2] Forbes says Greth had been on Endeavor's board since 2013 and became chair when her father died in August 2024.[1]
Sale to Diamondback
Diamondback signed the merger agreement on 11 February 2024, and the merger was completed on 10 September 2024.[3] Forbes values the deal at about US$26 billion in cash and stock.[1] At completion Diamondback signed a stockholders' agreement with the former Endeavor owners, known as the Stephens Stockholders. It gives them the right to designate four directors, a number that falls as their holding drops below set thresholds. With a stake of at least 20% but under 25%, for example, they may designate two. The four designees named in the 2026 proxy are Darin G. Holderness, Charles A. Meloy, Robert K. Reeves and Lance W. Robertson.[7]
Control of the family holding
The first Schedule 13D, filed on 13 September 2024, sets out her roles. She is sole trustee of the Autry Stephens Management Trust and sole manager of ACS Capital Management, LLC. She is co-trustee and investment direction adviser of the Stephens Family Trust and the Stephens Family Trust #2, and sole member and manager of SFT Management, LLC. The filing reported shared voting and dispositive power over 114,899,378 Diamondback shares, or 38.9%.[3]
The family has since sold shares. Diamondback's 2026 proxy recorded SGF FANG Holdings, LP as owning 84,036,722 shares, according to its March 2026 filing. Greth reports voting and dispositive power over those shares but disclaims beneficial ownership beyond her pecuniary interest.[7] On 16 September 2026 SGF FANG sold 9,079,675 shares at US$205.26 each, leaving 64,957,047 shares, or 23.2%, according to the seventh amendment to the 13D.[4]
Political activity
An OpenFEC query for itemised individual contributions under her name for the 2022–2026 cycles returned no records.[8]
Wealth
Forbes gives oil and gas as the source of her wealth.[1]
Wealth history
Forbes has included this entry in its annual World's Billionaires list in 2 of the editions from 2001 to 2026 checked for this profile, starting with 2025. The table gives the rank and estimated net worth in each annual list, and, where applicable, the rank and estimate in the Forbes 400 list of the richest Americans.[6][1]
| Year | World's Billionaires rank | Net worth (US$ bn) | Forbes 400 rank | Forbes 400 net worth (US$ bn) |
|---|---|---|---|---|
| 2024 | – | – | 28 | 32.3 |
| 2025 | 77 | 25.8 | 35 | 27.4 |
| 2026 | 77 | 30.0 | 37 | 30.0 |
International and political links
This section uses the same ten headings for every profile in this series. Only specific, sourced actions are included; company-level and foundation-level actions are labelled as such. Where nothing was found, the entry reads "No documented involvement found in sources checked."
Israel (investments, operations, donations, contracts, statements)
No documented involvement found in sources checked.
Zionist or pro-Israel organisations and lobbying groups
No documented involvement found in sources checked.
Jewish communal charities
No documented involvement found in sources checked.
Gulf states
No documented involvement found in sources checked.
China
No documented involvement found in sources checked.
Russia
No documented involvement found in sources checked.
India
No documented involvement found in sources checked.
Palestinian or Arab causes
No documented involvement found in sources checked.
Home government
Her family's holding company is a major shareholder in Diamondback Energy, a Permian Basin oil producer, and has the right to designate members of its board.[7][4]
Other international links
No documented involvement found in sources checked.
See also
Notes
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Forbes, Forbes profile record for Lyndal Stephens Greth (Forbes data feed behind forbes.com/profile/lyndal-stephens-greth/) Forbes, live record, read 20 October 2026, accessed 20 October 2026.
- ↑ 2.0 2.1 Diamondback Energy, Inc., Diamondback and Endeavor announcement (employee communication filed under Rule 14a-12, Schedule 14A) US Securities and Exchange Commission (EDGAR), 12 February 2024, accessed 20 October 2026.
- ↑ 3.0 3.1 3.2 Lyndal Stephens Greth et al., Schedule 13D in respect of Diamondback Energy, Inc. common stock US Securities and Exchange Commission (EDGAR), 13 September 2024, accessed 20 October 2026.
- ↑ 4.0 4.1 4.2 SGF FANG Holdings, LP and Lyndal Stephens Greth, Schedule 13D/A (Amendment No. 7) in respect of Diamondback Energy, Inc. common stock US Securities and Exchange Commission (EDGAR), 17 September 2026, accessed 20 October 2026.
- ↑ Forbes, Forbes Real-Time Billionaires data feed Forbes, live; downloaded 20 October 2026 11:51 UTC, accessed 20 October 2026.
- ↑ 6.0 6.1 Forbes, Forbes World's Billionaires list data feed, annual editions 2001–2026 (one file per year at this path with the year substituted; all 26 files downloaded and read) Forbes, annual lists; downloaded 20 October 2026, accessed 20 October 2026.
- ↑ 7.0 7.1 7.2 Diamondback Energy, Inc., Definitive proxy statement (Schedule 14A) for the 2026 annual meeting US Securities and Exchange Commission (EDGAR), 9 April 2026, accessed 20 October 2026.
- ↑ U.S. Federal Election Commission, OpenFEC Schedule A (itemised individual contributions) query, contributor name "GRETH, LYNDAL"; 2026 cycle shown in link, the 2022, 2024 and 2026 cycles were queried together with the same parameters; top 100 records by amount; compiler filtered records by employer/occupation and name and excluded memo entries U.S. Federal Election Commission, data as filed; queried 20 October 2026, accessed 20 October 2026.