Diamondback Energy (FANG)SGF FANG Holdings, LP cut its FANG stake to 23.2% from 26.3% 23.2%

23.2%

Stake · was 26.3%

65M

Shares owned

Stake as of

Sep 16, 2026

Filed

Sep 17, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Aug 3, 2026Company filing · Form 8-K · ResultsReported its results
2. Aug 3, 2026Insider · 1 personInsiders: 4 sales (~$6.6M)
3. Aug 11, 2026InsiderCEO sold ~$1.01M of FANG shares in the open market
4. Aug 13, 20265% stakeWellington Management Group LLP reported a passive stake (13G) of 5.8%
5. Aug 14, 2026Insider · 2 peopleInsiders: 2 sales (~$609K)
6. Aug 20, 2026Insider · 2 peopleInsiders: 3 sales (~$3.8M)
7. Aug 21, 2026InsiderDirector sold ~$211K of FANG shares in the open market
8. Sep 11, 2026Insider · Their largest sale since 2013Director sold ~$15.3M of FANG shares in the open market
9. Sep 15, 2026Insider · 2 peopleInsiders: 2 sales (~$1.3M)
10. Sep 16, 2026Insider · 13 days before an 8-K10% owner sold ~$1.86B of FANG shares in the open market

What came next

1. Sep 17, 20265% stakeSGF FANG Holdings, LP filed an activist stake (13D) of 23.2%
2. Sep 29, 2026Company filing · Form 8-K · Material agreement, Executive changeChanged a top executive or board member, and signed an important agreement“In connection with a Board Stepdown (as defined in the Stockholders Agreement), and not due to any disagreement with the Company on any matter relating to the Company’s operations, policies or practices, Darin Holderness and Lance Robertson resigned from the Board on September 29, 2026 and September 30, 2026, respectively.”
3. Oct 5, 2026Insider · 1 personInsiders: 3 sales (~$6.1M)
4. Oct 8, 2026Company filing · Form 8-K · ResultsReported its results

How to read SEC Schedule 13D

A Schedule 13D and a Schedule 13G both disclose beneficial ownership of more than 5% of a US company's voting shares. A 13D is the long form, filed by holders who may seek to influence or control the company, and it must state what they intend to do. A 13G is the short form, open only to passive holders and to certain institutions holding in the ordinary course of business, and it asks no question about intent.

Full guide: Schedule 13D vs Schedule 13G: what is the difference?

What else is on file for Diamondback Energy

For Diamondback Energy, OQRO holds 23 insider filings (SEC Form 4 or Form 144) and 13 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its FANG page.

How this filing works

• Schedule 13D vs 13G

Other disclosures at Diamondback Energy

• SEC Form 4Oct 7, 2026
• SEC Form 4Oct 7, 2026
• SEC Form 4Oct 7, 2026
• SEC Form 144Oct 5, 2026
• SEC Form 4Sep 17, 2026
• SEC Form 4Sep 17, 2026

Everything OQRO holds on this company is on its FANG page.