Halliburton

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-18 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: HALLIBURTON CO (HAL) CIK: 0000045012 --- Reporting Owner --- Name: Miller Jeffrey Allen CIK: 0001558667 Role: Director, Officer (Director, President & CEO) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-18 | Code: S (Open market sale) Shares: -124,483 | Price: $35.00 Total Value: $4,356,905.00 Shares Owned After: 889,388.615 | Ownership: D (Direct) Footnotes: [F1] The sale was effected pursuant to a Rule 10b5-l trading plan adopted by the Reporting Person on May 13, 2026. [F2] Includes 844.595 shares of stock purchased through the Halliburton Company Employee Stock Purchase Plan for the period ending March 31, 2026. --- Holdings --- [Holding #1] Security: Option to Buy Common Stock Ownership: D (Direct) [Holding #2] Security: Option to Buy Common Stock Ownership: D (Direct) --- Footnotes (Complete Index) --- F1: The sale was effected pursuant to a Rule 10b5-l trading plan adopted by the Reporting Person on May 13, 2026. F2: Includes 844.595 shares of stock purchased through the Halliburton Company Employee Stock Purchase Plan for the period ending March 31, 2026. --- Signature --- /s/ /s/ Sarah I. Rubenfeld, by Power of Attorney (2026-08-19)