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BCS

Notice of Proposed Sale · 144

Diamondback Energy, Inc.

FANGNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Aug 14, 2026Accepted Aug 14, 2026, 4:09 PM EDTFiling CIK 1539838Accession 0001921094-26-000867
Share

Structured filing — 144

primary_doc.xml

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer
Diamondback Energy, Inc.
Issuer CIK
0001539838
SEC file number
001-35700
Phone
432-221-7400
Person for whose account securities are to be sold
Zmigrosky Matt
Relationships to issuer
Officer
Street
500 WEST TEXAS AVENUE
Street (continued)
SUITE 100
City
MIDLAND
State / country code
TX
Postal code
79701

Securities proposed for sale

Securities proposed for sale · 1 reported row
SecurityProposed unitsAggregate market valueUnits outstandingApproximate sale dateExchangeBroker / market maker
Common2,500506,930.00280,024,35308/14/2026NASDAQCharles Schwab & Co., Inc.

Broker / market maker — proposed row 1, entry 1

Name
Charles Schwab & Co., Inc.
Street
3000 Schwab Way
City
Westlake
State / country code
TX
Postal code
76262

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
SecurityAcquiredNature of acquisitionAcquired fromAmount acquiredGift transactionPayment dateNature of payment
Common05/28/2020RSU / PSU - See RemarksDiamondback Energy, Inc.2,500N05/28/2020Equity Compensation

Sales reported in the preceding three months

Sales reported in the preceding three months · 2 reported rows
SellerSecuritySale dateAmount soldGross proceeds
Matt ZmigroskyDiamondback Energy, Inc.06/01/20265,0001,002,701.00
Matt ZmigroskyDiamondback Energy, Inc.06/03/20265,0001,050,000.00

Seller — prior-sale row 1, entry 1

Name
Matt Zmigrosky
Street
500 WEST TEXAS AVENUE
Street (continued)
SUITE 100
City
MIDLAND
State / country code
TX
Postal code
79701

Seller — prior-sale row 2, entry 1

Name
Matt Zmigrosky
Street
500 WEST TEXAS AVENUE
Street (continued)
SUITE 100
City
MIDLAND
State / country code
TX
Postal code
79701

Prior-sale reporting

Nothing to report for the preceding three months
N

Remarks

The shares sold in this filing were acquired and paid for between 05/28/2020 and 03/01/2022.

Notice signature

Notice date
08/14/2026
Signed
Matt Zmigrosky

Company context

Diamondback is an independent oil and natural gas company headquartered in Midland, Texas focused on the acquisition, development, exploration and exploitation of unconventional, onshore oil and natural gas reserves primarily in the Permian Basin in West Texas. For more information, please visit www.diamondbackenergy.com.

Current securities

Recent company filings

  1. 10-Q filingNov 4, 2026
  2. Results of Operations and Financial ConditionNov 2, 2026
  3. Results of Operations and Financial ConditionOct 8, 2026
  4. 4 filingOct 7, 2026
  5. 144 filingOct 5, 2026

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