Halliburton

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-30 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: HALLIBURTON CO (HAL) CIK: 0000045012 --- Reporting Owner --- Name: Smith Maurice S CIK: 0001841752 Role: Director --- Derivative Transactions --- [Transaction #1] Security: Stock Equivalent Units Date: 2026-06-30 | Code: A (Grant or award) Shares: +1,079.638 Shares Owned After: 14,848.092 | Ownership: D (Direct) Footnotes: [F1] The security converts to common stock on a one-for-one basis. [F2] Stock equivalents acquired under the Halliburton Company Directors' Deferred Compensation Plan reported on a pro-rata basis to reflect Issuer's Plan period. Said Plan is an ongoing securities acquisition plan. [F4] A portion of the stock equivalents are attributable to dividends and a portion are attributable to quarterly fees and are based on the closing price on March 25, 2026 of $38.63, June 24, 2026 of $33.90, and June 29, 2026 of $34.09. [F3] The stock equivalent units were accrued under the Company's Directors' Deferred Compensation Plan and are settled in the Company's common stock following cessation as a director. [F3] The stock equivalent units were accrued under the Company's Directors' Deferred Compensation Plan and are settled in the Company's common stock following cessation as a director. --- Holdings --- [Holding #1] Security: 12/2025 Restricted Stock Units Ownership: D (Direct) Footnotes: [F5] Each restricted stock unit represents a right to receive one share of the Company common stock. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F7] Includes stock equivalent units through June 30, 2026. [Holding #2] Security: 12/2024 Restricted Stock Units Ownership: D (Direct) Footnotes: [F5] Each restricted stock unit represents a right to receive one share of the Company common stock. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F7] Includes stock equivalent units through June 30, 2026. [Holding #3] Security: 12/2023 Restricted Stock Units Ownership: D (Direct) Footnotes: [F5] Each restricted stock unit represents a right to receive one share of the Company common stock. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F7] Includes stock equivalent units through June 30, 2026. [Holding #4] Security: 03/2023 Restricted Stock Units Ownership: D (Direct) Footnotes: [F5] Each restricted stock unit represents a right to receive one share of the Company common stock. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F6] The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. [F7] Includes stock equivalent units through June 30, 2026. --- Footnotes (Complete Index) --- F1: The security converts to common stock on a one-for-one basis. F2: Stock equivalents acquired under the Halliburton Company Directors' Deferred Compensation Plan reported on a pro-rata basis to reflect Issuer's Plan period. Said Plan is an ongoing securities acquisition plan. F3: The stock equivalent units were accrued under the Company's Directors' Deferred Compensation Plan and are settled in the Company's common stock following cessation as a director. F4: A portion of the stock equivalents are attributable to dividends and a portion are attributable to quarterly fees and are based on the closing price on March 25, 2026 of $38.63, June 24, 2026 of $33.90, and June 29, 2026 of $34.09. F5: Each restricted stock unit represents a right to receive one share of the Company common stock. F6: The restricted stock units vest in one year on the first anniversary of the award. Shares will be delivered to the reporting person either upon vesting, or if reporting person elected to defer receipt, following cessation as a director. F7: Includes stock equivalent units through June 30, 2026. --- Signature --- /s/ /s/ Sarah I. Rubenfeld, by Power of Attorney (2026-06-30)