Key facts
- This page summarizes Anthony G. Petrello's Form 4 filing for NABORS INDUSTRIES LTD (NBR).
- 17 reported transactions and 8 derivative rows are listed below.
- Accepted by SEC: 05 Jan 2026, 08:48.
Anthony G. Petrello - 31 Dec 2025 Form 4 Insider Report for NABORS INDUSTRIES LTD (NBR)
- Reporting relationship
- CHAIRMAN, PRESIDENT & CEO, Director
- Issuer ticker
- NBR
- Reported as of
- 31 Dec 2025
- Net transaction value
- -$1,174,563
- SEC form
- 4
- Accepted by SEC
- 05 Jan 2026, 08:48:21 UTC
- Prior SEC filing
- 03 Jan 2025
- Source filing
- View source filing
- Reporting owner signature
- /s/ Mark D. Andrews by Power of Attorney for Anthony G. Petrello
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Anthony G. Petrello filed Form 4 for NABORS INDUSTRIES LTD (NBR) on 05 Jan 2026.
Change
- Previous filing in this sequence was filed on 03 Jan 2025.
- Current net transaction value: -$1,174,563.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001195669
Primary reporting owner
PETRELLO ANTHONY G
- Relationship
- CHAIRMAN, PRESIDENT & CEO, Director
- Address
- C/O NABORS CORPORATE SERVICES, INC., 515 WEST GREENS ROAD, HOUSTON
- Signature
- /s/ Mark D. Andrews by Power of Attorney for Anthony G. Petrello
- Signature date
- 05 Jan 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
NBR
transaction
Common Stock
Gift
- Transaction value
- $0
- Shares
- -18,000
- Change %
- -5.8%
- Price
- $0.000000
- Shares after
- 294,793
- Date
- 31 Dec 2025
- Ownership
- Trust
- Footnotes
- F1
NBR
transaction
Common Stock
Disposed to Issuer
- Transaction value
- $0
- Shares
- -17,843
- Change %
- -19%
- Price
- $0.000000
- Shares after
- 74,426
- Date
- 31 Dec 2025
- Ownership
- Direct
- Footnotes
- F2
NBR
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +5,016
- Change %
- +6.7%
- Price
- $0.000000
- Shares after
- 79,442
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F3
NBR
transaction
Common Stock
Tax liability
- Transaction value
- $107,188
- Shares
- -1,974
- Change %
- -2.5%
- Price
- $54.30
- Shares after
- 77,468
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F4
NBR
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +13,980
- Change %
- +18%
- Price
- $0.000000
- Shares after
- 91,448
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F5
NBR
transaction
Common Stock
Tax liability
- Transaction value
- $298,759
- Shares
- -5,502
- Change %
- -6%
- Price
- $54.30
- Shares after
- 85,946
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F6
NBR
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +19,098
- Change %
- +22%
- Price
- $0.000000
- Shares after
- 105,044
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F7
NBR
transaction
Common Stock
Tax liability
- Transaction value
- $417,730
- Shares
- -7,693
- Change %
- -7.3%
- Price
- $54.30
- Shares after
- 97,351
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F8
NBR
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +16,420
- Change %
- +17%
- Price
- $0.000000
- Shares after
- 113,771
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F9
NBR
transaction
Common Stock
Tax liability
- Transaction value
- $350,887
- Shares
- -6,462
- Change %
- -5.7%
- Price
- $54.30
- Shares after
- 107,309
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F10
NBR
transaction
Common Stock
Award
- Transaction value
- $0
- Shares
- +48,621
- Change %
- +45%
- Price
- $0.000000
- Shares after
- 155,930
- Date
- 01 Jan 2026
- Ownership
- Direct
- Footnotes
- F11
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
NBR
transaction
Derivative
2023 Performance Share Units
Options Exercise
- Transaction value
- $0
- Shares
- -5,016
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 01 Jan 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 5,016
- Exercise price
- Footnotes
- F3, F12
NBR
transaction
Derivative
2024 Performance Share Units
Options Exercise
- Transaction value
- $0
- Shares
- -13,980
- Change %
- -50%
- Price
- $0.000000
- Shares after
- 13,981
- Date
- 01 Jan 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 13,980
- Exercise price
- Footnotes
- F5, F12
NBR
transaction
Derivative
2025 Performance Share Units
Award
- Transaction value
- $0
- Shares
- +57,293
- Change %
- Price
- $0.000000
- Shares after
- 57,293
- Date
- 01 Jan 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 57,293
- Exercise price
- Footnotes
- F12, F13
NBR
transaction
Derivative
2025 Performance Share Units
Options Exercise
- Transaction value
- $0
- Shares
- -19,098
- Change %
- -33%
- Price
- $0.000000
- Shares after
- 38,195
- Date
- 01 Jan 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 19,098
- Exercise price
- Footnotes
- F7, F12
NBR
transaction
Derivative
2023 Long Term Performance Share Units
Award
- Transaction value
- $0
- Shares
- +16,420
- Change %
- Price
- $0.000000
- Shares after
- 16,420
- Date
- 01 Jan 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 16,420
- Exercise price
- Footnotes
- F12, F14
NBR
transaction
Derivative
2023 Long Term Performance Share Units
Options Exercise
- Transaction value
- $0
- Shares
- -16,420
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 01 Jan 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 16,420
- Exercise price
- Footnotes
- F9, F12
NBR
holding
Derivative
2021 Warrants
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 4,470
- Date
- 31 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 4,470
- Exercise price
- $166.67
NBR
holding
Derivative
2021 Warrants
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 170,649
- Date
- 31 Dec 2025
- Ownership
- Trust
- Underlying class
- Common Stock
- Underlying amount
- 170,649
- Exercise price
- $166.67
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 14 footnotes
Footnote F1
These shares were donated to a charitable foundation for which Mr. Petrello has shared voting and dispositive power. Mr. Petrello disclaims beneficial ownership of the shares held by the charitable foundation.
Footnote F2
Represents the number of TSR shares forfeited on December 31, 2025, out of a total of 17,843 TSR shares originally granted to Mr. Petrello on January 1, 2023, based on the Issuer's relative total shareholder return as compared to a peer group of companies during the three-year performance period beginning on January 1, 2023 and ending on December 31, 2025, as determined on December 31, 2025, by the Compensation Committee of the Issuer's Board of Directors (the "Compensation Committee").
Footnote F3
Reflects the number of shares vesting on January 1, 2026 in respect of the 15,048 earned and vested Performance restricted stock units originally granted on January 1, 2023.
Footnote F4
Reflects the number of shares surrendered on January 1, 2026 to satisfy the tax withholding on the vesting and issuance of 5,016 shares of the 15,048 Performance restricted stock units originally granted on January 1, 2023. The remaining 3,042 vested performance shares were retained by Mr. Petrello.
Footnote F5
Reflects the number of shares vesting on January 1, 2026 in respect of the 41,942 earned and vested Performance restricted stock units originally granted on January 1, 2024.
Footnote F6
Reflects the number of shares surrendered on January 1, 2026 to satisfy the tax withholding on the vesting and issuance of 13,980 shares of the 41,942 Performance restricted stock units originally granted on January 1, 2024. The remaining 8,478 vested performance shares were retained by Mr. Petrello.
Footnote F7
Reflects the number of shares vesting on January 1, 2026 in respect of the 57,293 earned and vested Performance restricted stock units originally granted on January 1, 2025.
Footnote F8
Reflects the number of shares surrendered on January 1, 2026 to satisfy the tax withholding on the vesting and issuance of 19,098 shares of the 57,293 Performance restricted stock units originally granted on January 1, 2025. The remaining 11,405 vested performance shares were retained by Mr. Petrello.
Footnote F9
Represents the aggregate number of Long Term 2023 Performance restricted stock units originally granted on May 18, 2023, the vesting of which was subject to the achievement of certain ROIC performance criteria, that have been earned as a result of the achievement of the applicable performance criteria. All of such shares have fully vested as of January 1, 2026.
Footnote F10
Reflects the number of shares surrendered on January 1, 2026 to satisfy the tax withholding on the vesting and issuance of 16,420 shares of the 2023 Long Term Performance restricted stock units originally granted on May 18, 2023. The remaining 9,958 vested performance shares were retained by Mr. Petrello.
Footnote F11
Represents an award of TSR shares that will only vest at the end of a three-year performance period (January 1, 2026 to December 31, 2028) based on the Issuer's relative total shareholder return as compared to a peer group of companies. The number of shares reported represents the maximum that may be earned, which is 200% of the target number. No number of shares is guaranteed to vest and the actual number of shares that will vest at the end of the performance period may be anywhere from zero to the amount stated.
Footnote F12
Performance restricted stock units convert into common shares on a 1-for-1 basis.
Footnote F13
These Performance restricted stock units were earned by Mr. Petrello pursuant to his employment agreement based on the achievement of certain objectives for the year 2025, as determined on December 31, 2025, by the Compensation Committee. 191.78% of the target number of performance restricted stock units granted pursuant to the terms of Mr. Petrello's employment agreement were determined to have been earned. The number reported above reflects the number of earned performance restricted stock units that are payable in share-settled restricted stock units. The remaining 52,578 performance restricted stock units were settled in cash pursuant to the terms of the applicable award agreement. The Performance restricted stock units that settle in shares are scheduled to vest in three (3) equal annual installments beginning on the first anniversary of the date of grant, January 1, 2026.
Footnote F14
On May 18, 2023, the Reporting Person was granted Performance restricted stock units, the vesting of which is subject to the achievement of certain ROIC performance criteria during the three-year performance period beginning on January 1, 2023 and ending on December 31, 2025. The number of shares reported in this line item represents the number of Performance restricted stock units that were earned as a result of the achievement of such performance criteria.