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FANGDiamondback Energy, Inc. · Insider ownership research

Diamondback Energy, Inc. insiders sold $170M in the past 12 months. How much of their stake is that?

About 36% overall. As a group they still hold 77% of their starting shares. These figures leave out Charles Meloy, the largest holder (holdings couldn't be fully reconciled).

Updated Oct 8, 2026 from SEC filings · covers Oct 9, 2025 to Oct 8, 2026
How this comparesMore of their stake sold than at 152 of the 156 other companies we can measure (#5 of 157)See ranking
0
buyers among officers and directors, past 12 months
28%
of sales were under disclosed trading plans, past 12 months
10 of 19
officers and directors sold shares, past 12 months
Recent activity · past 30 days, Sep 9, 2026 to Oct 8, 2026
Oct 5, 2026Charles Meloy sold 33K shares ($6.1M) under a disclosed trading plan.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Charles Meloy
Director
33,333$183.74n/an/aOct 5, 2026Oct 7, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Sep 16, 2026Charles Meloy gave away 25K shares as a gift.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Charles Meloy
Director
25,000n/an/an/aSep 16, 2026Sep 17, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Sep 15, 20262 executives sold 6.3K shares ($1.3M) with no plan disclosed. That is between 3.5% and 6.2% of each person's total stake held that day.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Teresa Dick
EVP Accounting, Assist. Sec.
5,000$210.006.2%76KSep 15, 2026Sep 17, 2026
Matt Zmigrosky
EVP, Chief Legal and Admin Off
1,326$212.563.5%37KSep 15, 2026Sep 17, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Sep 15, 2026Charles Meloy gave away 25K shares as a gift.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Charles Meloy
Director
25,000n/an/an/aSep 15, 2026Sep 17, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Sep 11, 2026Travis Stice sold 75K shares ($15.3M) with no plan disclosed. That is 17% of the total stake held that day.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Travis Stice
Director
75,000$204.3117%355KSep 11, 2026Sep 14, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Sep 10, 20262 executives had 1.5K shares ($313K) withheld by the company for taxes (not a market sale). That is between 2.2% and 2.8% of each person's total stake held that day.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Matt Zmigrosky
EVP, Chief Legal and Admin Off
861$202.632.2%38KSep 10, 2026Sep 14, 2026
Albert Barkmann
Exec. VP and Chief Engineer
682$202.632.8%24KSep 10, 2026Sep 14, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Is this normal? More than usual: about 8x the 5-year average. 10 insiders sold; the average is 7 a year. Year by year
Latest filing: Filed Oct 7 for a sale on Oct 5. Charles Meloy sold 33K shares ($6.1M) under a disclosed plan. Filing
80 SEC ownership filings in the period · See the evidence

What stands out

Seven insiders sold more than 25% of vested holdings: Travis Stice (34% of holdings, $33.4M, none under a disclosed plan), Hof Van't (39% of holdings, $9.5M, none under a disclosed plan) and Matt Zmigrosky (71% of holdings, $8.9M, none under a disclosed plan), plus 4 more.Travis Stice: largest sale, Sep 11, 2026 · Hof Van't: largest sale, Jun 3, 2026 · Matt Zmigrosky: largest sale, Mar 13, 2026
Outside holder SGF FANG Holdings, LP, a 10% owner and not part of management, sold $8.74B of stock, 14% of the starting stake.Largest sale, Mar 12, 2026
Charles Meloy sold $52.4M of stock with no disclosed trading plan. The filings don't state a reason.Largest such sale, Dec 4, 2025

Percentages cover 18 of 19 officers and directors. Left out: Charles Meloy (holdings couldn't be fully reconciled). Disclosed company stock is not an insider's whole wealth.

Who sold, and how much of their stake

Officers and directors, past 12 months. Each bar is the insider's vested stake at the start of the period (Oct 8, 2025). The gold part is what they sold.

SoldRest of starting stakeAdded during the period
Charles Meloy
Director
No bar: holdings couldn't be fully reconciled.
$99.7M47% planned
Travis Stice
Director
34% · $33.4MNo plan disclosed
Hof Van't
Chief Executive Officer, Director
39% · $9.5MNo plan disclosed
Matt Zmigrosky
EVP, Chief Legal and Admin Off
71% · $8.9MNo plan disclosed
Teresa Dick
EVP Accounting, Assist. Sec.
40% · $8.4MNo plan disclosed
All 10 sellers

Selling by month

Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.

Disclosed planTo cover taxesNo plan disclosed
OctNov 2025: $2.7M no plan disclosedNovDec 2025: $8K under a disclosed planDec 2025: $52.4M no plan disclosed$52.4MDecJanFeb 2026: $10.1M under a disclosed planFebMar 2026: $2.9M under a disclosed planMar 2026: $34.1M no plan disclosedMarApr 2026: $3.1M under a disclosed planAprMay 2026: $3.0M under a disclosed planMay 2026: $3.9M no plan disclosedMayJun 2026: $15.6M under a disclosed planJun 2026: $7.7M no plan disclosedJunJulAug 2026: $6.6M under a disclosed planAug 2026: $5.6M no plan disclosedAugSep 2026: $16.7M no plan disclosedSepOct 2026: $6.1M under a disclosed planOct

Outside holders, reported separately

SGF FANG Holdings, LP sold $8.74B in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.

Details

Common questions

Is the Diamondback Energy, Inc. CEO selling stock?

Yes. Hof Van't sold 50K shares ($9.5M, 39% of starting holdings) in the past 12 months, none of it under a trading plan disclosed in the filings.

Why are Diamondback Energy, Inc. insiders selling?

Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 28% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 72% had no disclosed plan. A trading plan schedules sales in advance.

Are any Diamondback Energy, Inc. insiders buying?

No. Officers and directors reported no purchases in the past 12 months.

How much of their stake did Diamondback Energy, Inc. insiders sell?

About 36% overall. As a group they still hold 77% of their starting shares. These figures leave out Charles Meloy, the largest holder (holdings couldn't be fully reconciled). That covers the 12 months to Oct 8, 2026 and counts vested shares reported on SEC Forms 3, 4 and 5, which is not an insider's whole wealth.

The evidence

Who sold10 officers and directors: amount, % of holdings, trading plan
Who soldAmount% of holdingsTrading plan
Charles Meloy
Director
$99.7M
638K shares
i
No percentage: holdings couldn't be fully reconciled.
47% under a disclosed plan
Travis Stice
Director
$33.4M
175K shares
34%No plan disclosed
Hof Van't
Chief Executive Officer, Director
$9.5M
50K shares
39%No plan disclosed
Matt Zmigrosky
EVP, Chief Legal and Admin Off
$8.9M
47K shares
71%No plan disclosed
Teresa Dick
EVP Accounting, Assist. Sec.
$8.4M
43K shares
40%No plan disclosed
Daniel Wesson
Exec. VP & COO
$6.8M
37K shares
43%No plan disclosed
Albert Barkmann
Exec. VP and Chief Engineer
$1.3M
7K shares
28%No plan disclosed
Steven West
Director
$1.1M
6K shares
44%No plan disclosed
Jere Thompson III
CFO, Executive VP
$726K
4K shares
29%No plan disclosed
Mark Plaumann
Director
$309K
1.5K shares
12%No plan disclosed

Outside holder, reported separately: SGF FANG Holdings, LP (a 10% owner, not part of management). Sold $8.74B (45.81M shares) from Nov 28, 2025 to Sep 16, 2026. Holds 281.54M shares. Latest filing

The full ownership picture18 of 19 insiders fully reconciled · 19 officers and directors

Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.

InsiderHeld Oct 8, 2025SoldHeld Oct 8, 2026Still held
Charles Meloy
!
Holdings couldn't be fully reconciled. A footnote describes a transfer or distribution between related entities, but the amounts could not be matched to the balance change. Largest: +377,911 shares on Dec 4, 2025 (Wolfrock Energy, LLC). See the filing Sales and other transactions for Charles Meloy are complete.
Director
n/a−638Kn/an/a
Vesting, gifts, unvested awards and holding lines for Charles Meloy
0shares vested or exercised
−159Kgifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.

Holdings couldn't be fully reconciled. A footnote describes a transfer or distribution between related entities, but the amounts could not be matched to the balance change. Largest: +377,911 shares on Dec 4, 2025 (Wolfrock Energy, LLC). The balances below are as reported, not verified totals.

Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock2,27528,257
Wolfrock Energy, LLCCommon Stock1,078,864759,864
Katy Evans Meloy 2011 TrustCommon Stock00
Grady Allen Meloy 2011 TrustCommon Stock00
Travis Stice
i
Includes unvested RSUs, amount not disclosed.
Director
521K−175K355K68%
Vesting, gifts, unvested awards and holding lines for Travis Stice
0shares vested or exercised
−50Kgifted (net of own trusts)
−42Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock102,14549,727
Stice Investments, Ltd
includes unvested RSUs, amount not disclosed
Common Stock419,271305,314
Hof Van't
i
Includes unvested RSUs, amount not disclosed.
Chief Executive Officer, Director
129K−50K116K90%
Vesting, gifts, unvested awards and holding lines for Hof Van't
0shares vested or exercised
−3.7Kgifted (net of own trusts)
−23Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock129,264115,940
Teresa Dick
i
Minor difference of -5 shares. Difference is under 0.5% of holdings. Includes unvested RSUs, amount not disclosed.
EVP Accounting, Assist. Sec.
105K−43K76K72%
Vesting, gifts, unvested awards and holding lines for Teresa Dick
0shares vested or exercised
0gifted (net of own trusts)
−10Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock105,00275,755

Reconciliation: minor difference of -5 shares. Difference is under 0.5% of holdings.

Daniel Wesson
i
Includes unvested RSUs, amount not disclosed.
Exec. VP & COO
84K−37K71K84%
Vesting, gifts, unvested awards and holding lines for Daniel Wesson
0shares vested or exercised
0gifted (net of own trusts)
−16Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock84,11770,789
Matt Zmigrosky
i
Minor difference of -5 shares. Difference is under 0.5% of holdings. Includes unvested RSUs, amount not disclosed.
EVP, Chief Legal and Admin Off
67K−47K37K55%
Vesting, gifts, unvested awards and holding lines for Matt Zmigrosky
0shares vested or exercised
0gifted (net of own trusts)
−12Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock67,03436,705

Reconciliation: minor difference of -5 shares. Difference is under 0.5% of holdings.

Albert Barkmann
i
Minor difference of -6 shares. Difference is under 0.5% of holdings. Includes unvested RSUs, amount not disclosed.
Exec. VP and Chief Engineer
25K−7K24K95%
Vesting, gifts, unvested awards and holding lines for Albert Barkmann
0shares vested or exercised
0gifted (net of own trusts)
−4.2Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock25,16823,889

Reconciliation: minor difference of -6 shares. Difference is under 0.5% of holdings.

Melanie Trent
i
Includes unvested RSUs, amount not disclosed.
Director
14K015Kno sales
Vesting, gifts, unvested awards and holding lines for Melanie Trent
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock14,05715,039
Jere Thompson III
i
Minor difference of -6 shares. Difference is under 0.5% of holdings. Includes unvested RSUs, amount not disclosed.
CFO, Executive VP
14K−4K18K+34%
Vesting, gifts, unvested awards and holding lines for Jere Thompson III
0shares vested or exercised
0gifted (net of own trusts)
−5.1Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock13,78818,475

Reconciliation: minor difference of -6 shares. Difference is under 0.5% of holdings.

Steven West
i
Minor difference of -3,068 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer). Includes unvested RSUs, amount not disclosed.
Director
14K−6K5.5K40%
Vesting, gifts, unvested awards and holding lines for Steven West
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock13,5525,466

Reconciliation: minor difference of -3,068 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Mark Plaumann
i
Minor difference of 7,688 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer). Includes unvested RSUs, amount not disclosed.
Director
13K−1.5K20K+55%
Vesting, gifts, unvested awards and holding lines for Mark Plaumann
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock5,26712,437
Greyhawke Capital Advisors LLC
includes unvested RSUs, amount not disclosed
Common Stock7,6887,688

Reconciliation: minor difference of 7,688 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Vincent Brooks
i
Includes unvested RSUs, amount not disclosed. Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.
Director
11K012Kno sales
Vesting, gifts, unvested awards and holding lines for Vincent Brooks
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
  • Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.
Held throughShare classOct 8, 2025Oct 8, 2026
VKB Solutions, LLC
includes unvested RSUs, amount not disclosed
Common Stock10,65311,635

Additional holdings last reported Jun 8, 2023, not confirmed since: 8,201 shares. Not included in any total or percentage on this page.

Stephanie Mains
i
Includes unvested RSUs, amount not disclosed.
Director
11K012Kno sales
Vesting, gifts, unvested awards and holding lines for Stephanie Mains
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock10,65311,635
Lance Robertson
i
Includes unvested RSUs, amount not disclosed.
Director
9K010Kno sales
Vesting, gifts, unvested awards and holding lines for Lance Robertson
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock9,0179,999
Frank Tsuru
i
Includes unvested RSUs, amount not disclosed.
Director
7.1K08.1Kno sales
Vesting, gifts, unvested awards and holding lines for Frank Tsuru
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock7,1478,129
Rebecca Klein
i
Includes unvested RSUs, amount not disclosed.
Director
5.1K06.1Kno sales
Vesting, gifts, unvested awards and holding lines for Rebecca Klein
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock5,1476,129
Robert Reeves
i
Includes unvested RSUs, amount not disclosed.
Director
5.1K06.1Kno sales
Vesting, gifts, unvested awards and holding lines for Robert Reeves
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock5,0846,066
Chad McAllaster
i
Includes unvested RSUs, amount not disclosed.
EVP-Operations
2.9K05.9Kno sales
Vesting, gifts, unvested awards and holding lines for Chad McAllaster
0shares vested or exercised
0gifted (net of own trusts)
−969withheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock2,8925,889
Darin Holderness
i
Includes unvested RSUs, amount not disclosed.
Director
1.8K02.8Kno sales
Vesting, gifts, unvested awards and holding lines for Darin Holderness
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 8, 2025Oct 8, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock1,8162,798

18 of 19 insiders fully reconciled: starting holdings plus reported transactions match ending holdings (12 exactly, 6 with a minor or footnoted difference). For 1 we show sales but not holdings; the ! icon on that row explains why. Percentages cover 18 of 19 officers and directors. Left out: Charles Meloy (holdings couldn't be fully reconciled). "Still held" compares ending with starting vested shares; a plus sign means the holding grew.

What explains the selling$170M of sales by plan status, purpose, seller and month

Officer and director open-market sales: $170M across 1,007,737 shares. Plan status and stated purpose are separate questions, and a sale can have both.

By plan status

The lighter segment is sales with no plan disclosed in the filing ($123M), including tax-related sales outside a plan.

No plan disclosed · $123M

Sales with no 10b5-1 plan and no tax reference in the filing. $52.4M of it is Charles Meloy. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Charles Meloy, Dec 4, 2025

Taxes

113,020 shares ($19.7M) were withheld by the company for taxes, which isn't a market sale.

SellerShares soldProceedsUnder a disclosed planShare of totalSales dates
Charles Meloy
Director
638K$99.7M47%59%Dec 4, 2025 to Oct 5, 2026
Travis Stice
Director
175K$33.4M0%20%Mar 6, 2026 to Sep 11, 2026
Hof Van't
Chief Executive Officer, Director
50K$9.5M0%6%Nov 6, 2025 to Aug 20, 2026
Matt Zmigrosky
EVP, Chief Legal and Admin Off
47K$8.9M0%5%Nov 14, 2025 to Sep 15, 2026
Teresa Dick
EVP Accounting, Assist. Sec.
43K$8.4M0%5%Mar 6, 2026 to Sep 15, 2026
Daniel Wesson
Exec. VP & COO
37K$6.8M0%4%Nov 26, 2025 to Aug 20, 2026
Albert Barkmann
Exec. VP and Chief Engineer
7K$1.3M0%0.8%Mar 13, 2026 to May 15, 2026
Steven West
Director
6K$1.1M0%0.7%Mar 18, 2026 to Mar 18, 2026
Jere Thompson III
CFO, Executive VP
4K$726K0%0.4%Nov 11, 2025 to Aug 14, 2026
Mark Plaumann
Director
1.5K$309K0%0.2%Jun 9, 2026 to Aug 21, 2026

Sales by month

MonthSale proceedsDisclosed planTo cover taxesNo plan disclosed
Oct 2025$0$0$0$0
Nov 2025$2.7M$0$0$2.7M
Dec 2025$52.4M$8K$0$52.4M
Jan 2026$0$0$0$0
Feb 2026$10.1M$10.1M$0$0
Mar 2026$37.0M$2.9M$0$34.1M
Apr 2026$3.1M$3.1M$0$0
May 2026$6.8M$3.0M$0$3.9M
Jun 2026$23.3M$15.6M$0$7.7M
Jul 2026$0$0$0$0
Aug 2026$12.2M$6.6M$0$5.6M
Sep 2026$16.7M$0$0$16.7M
Oct 2026$6.1M$6.1M$0$0
Is this normal? Selling year by year5 earlier years to compare with

More than usual: about 8x the 5-year average. 10 insiders sold; the average is 7 a year.

12 months endingShares soldInsiders who soldProceeds
Oct 8, 2026
Latest 12 months
1.01M10$170M
Oct 8, 2025
1 year earlier
51K6$7.6M
Oct 8, 2024
2 years earlier
223K7$41.9M
Oct 9, 2023
3 years earlier
62K6$8.9M
Oct 9, 2022
4 years earlier
112K10$15.2M
Oct 9, 2021
5 years earlier
149K6$13.0M

Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.

Known gaps and uncertainty1 insider whose holdings couldn't be fully reconciled

Charles Meloy: holdings couldn't be fully reconciled (difference of 502,746 shares). A footnote describes a transfer or distribution between related entities, but the amounts could not be matched to the balance change. Largest: +377,911 shares on Dec 4, 2025 (Wolfrock Energy, LLC). Filing, Dec 4, 2025

Footnote: "Represents a transfer of limited partnership interests in CS Ventures Ltd., which is the sole member of Wolfrock Energy LLC, to trusts for the benefit of the Reporting Person's children. No shares of the Issuer's common stock were disposed of in connection with this transfer. | These securities are held directly by Wolfrock Energy, LLC, a Texas limited liability company whose sole member is CS Ventures, Ltd. CS Ventures, Ltd. is controlled by its general partner, Meloy Management, LLC, which is controlled by the Reporting Person."

Teresa Dick: minor difference of -5 shares. Difference is under 0.5% of holdings.

Matt Zmigrosky: minor difference of -5 shares. Difference is under 0.5% of holdings.

Albert Barkmann: minor difference of -6 shares. Difference is under 0.5% of holdings.

Jere Thompson III: minor difference of -6 shares. Difference is under 0.5% of holdings.

Steven West: minor difference of -3,068 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Mark Plaumann: minor difference of 7,688 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Inferred rename: "Davidson, Jacobs, Wexford GP and Wexford reflect common stock owned of record by DB Energy" is treated as the same holder as "Davidson, Jacobs, Wexford GP and Wexford reflect common stock owned of record by the Funds", because the old name was never reported again and the new one opened with the same balance (16,414,622 shares). Old name, new name

External context: we only cite outside events when a documented connection exists. None is shown for this period.

Sources and methodology692 filings from SEC EDGAR, and how we read them

All 692 Forms 3, 4 and 5 filed for Diamondback Energy, Inc. (SEC CIK 1539838) from Oct 11, 2012 to Oct 7, 2026, retrieved from SEC EDGAR on Oct 8, 2026. Prices are the ones reported in each filing, often weighted averages. 14 filings were left out because Diamondback Energy, Inc. filed them as an owner of another company's stock.

Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.

Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".

Full methodology

Former or inactive filers (14)No filing in 18 months; last reported balances, not in any total
NameLast filedLast reported balance
David HoustonJun 10, 202412,600 shares, last reported balance as of Jun 6, 2024
Thomas HawkinsJan 12, 202316,151 shares, last reported balance as of Aug 24, 2022
Jennifer SolimanJan 12, 202310,989 shares, last reported balance as of Aug 24, 2022
Michael CrossJun 13, 202223,006 shares, last reported balance as of Jun 9, 2022
Russell PantermuehlDec 9, 2021123,419 shares, last reported balance as of Dec 7, 2021
Randall HolderSep 18, 20198,448 shares, last reported balance as of Sep 16, 2019
Michael HollisSep 18, 2019221,939 shares, last reported balance as of Sep 16, 2019
Paul MolnarMar 5, 201963,037 shares, last reported balance as of Mar 1, 2019
Elizabeth MosesSep 21, 201617,309 shares, last reported balance as of Sep 19, 2016
WEXFORD CAPITAL LPDec 10, 201560,671,404 shares, last reported balance as of Dec 9, 2015
Jeffrey WhiteOct 13, 201512,134 shares, last reported balance as of Oct 12, 2015
GULFPORT ENERGY CORPJul 1, 20142,379,500 shares, last reported balance as of Jun 27, 2014
William FranklinSep 18, 20135,792 shares, last reported balance as of Sep 16, 2013
Paul JacobiOct 15, 2012No balance on record