People · #80 of 100 Net worths as of Sep 24, 2026
Billionaires Digest
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#80 of 100 · Energy

Lyndal Stephens Greth & family

Oil & Gas
Net worth
$29.2B
Forbes Real-Time · as of Sep 24, 2026
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Latest moves

No moves from Lyndal Stephens Greth & family in the digest yet. The archive grows every morning.

Recent SEC filings

SEC filings · last 90 days

Greth Lyndal · filed Sep 17, 2026
Sold 9.1M FANG · ~$1.9B
Greth Lyndal · filed Sep 17, 2026
Sold 9.1M FANG · ~$1.9B
Greth Lyndal · filed Sep 17, 2026

Form 4 insider trades post within 2 business days. 13F fund holdings can arrive 45 days after quarter end. New to filings? Read Filings 101.

Footprint

Companies

Diamondback Energy, Inc.FANG · NASDAQ · Largest shareholder · 23.2% · as of Sep 2026 · $189.01 ▲ 1.81%
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Ticker
FANG
Exchange
NASDAQ
Role
Largest shareholder; ultimate beneficial owner of shares held by SGF FANG Holdings, LP (shared voting/dispositive power). Received stock when Diamondback bought the family's Endeavor Energy Resources (~$26B, closed Sept 2024). Endeavor stockholders nominate four Diamondback directors under a Stockholders Agreement.
Stake
23.2% (64,957,047 shares)
Stake as of
2026-09-16
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Investment vehicles

SGF FANG Holdings, LPholding co
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Type
holding co
Notes
Delaware LP; record holder of the family's Diamondback shares since an Aug 13, 2025 internal reorganization (replacing Autry Stephens Management Trust, ACS Capital Management LLC and Stephens family trusts); Greth is ultimate beneficial owner
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Private deals

SGF FANG sold 9,079,675 Diamondback shares at $205.26 (~$1.86B) under Rule 144 via Morgan Stanley; 30-day lock-upSep 2026
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SGF FANG sold 10,000,000 Diamondback shares at $204.25 (~$2.04B) under Rule 144 via J.P. Morgan; 30-day lock-upJun 2026
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Underwritten secondary offering of 12,650,000 Diamondback shares at $170.19 (~$2.15B) via Evercore, Citigroup and J.P.…Mar 2026
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In full
Underwritten secondary offering of 12,650,000 Diamondback shares at $170.19 (~$2.15B) via Evercore, Citigroup and J.P. Morgan; closed Mar 12, 2026; 60-day lock-up
Date
2026-03-10
source ↗
Diamondback repurchased 1,000,000 shares at $162.88 (Feb 3) and 1,000,000 at $168.99 (Feb 4) from SGF FANG under the…Feb 2026
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In full
Diamondback repurchased 1,000,000 shares at $162.88 (Feb 3) and 1,000,000 at $168.99 (Feb 4) from SGF FANG under the repurchase agreement
Date
2026-02-04
source ↗
Repurchase agreement: Diamondback bought 2,000,000 shares from SGF FANG at $152.59; SGF FANG got the right to sell up…Nov 2025
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In full
Repurchase agreement: Diamondback bought 2,000,000 shares from SGF FANG at $152.59; SGF FANG got the right to sell up to 3,000,000 shares per quarter to Diamondback at prevailing closing prices through Dec 31, 2026
Date
2025-11-28
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Internal reorganization moved the family's 101.7M Diamondback shares (35.1%) into SGF FANG Holdings, LPAug 2025
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Research gaps: Forbes lists source as 'Oil & gas' (profile says she chaired private Endeavor Energy Resources after father Autry Stephens died Aug 2024; Endeavor sold to Diamondback, closed Sept 2024) — source: https://www.forbes.com/profile/lyndal-stephens-greth/. Web search budget exhausted; used EDGAR and Forbes only. Did not confirm whether Greth personally sits on Diamondback's board. No real estate, trophies, foundation/EIN, or other private investments verified. Diamondback Q3 2026 earnings date not confirmed. Vehicle CIK for SGF FANG Holdings not looked up.

Prices via Finnhub · as of Sep 24, 2026 4:00 PM ET. For information only.

What to watch

Expiry of 30-day lock-up from the Sept 16, 2026 sale (further sales possible after ~Oct 16, 2026)Oct 16, 2026
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Quarterly put right to sell up to 3M shares to Diamondback runs through Dec 31, 2026 (possible Q4 2026 repurchase)Dec 31, 2026
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New Schedule 13D/A and Form 4 filings from SGF FANG/Greth (stake has fallen from 35.1% in Aug 2025 to 23.2%)
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Diamondback Q3 2026 earnings (date not verified; typically early November)
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