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: Slocum Jeffrey Shannon CIK: 0001970357 Role: Director, Officer (Director, EVP and COO) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-18 | Code: S (Open market sale) Shares: -16,121 | Price: $35.08 Total Value: $565,573.04 Shares Owned After: 171,301.952 | Ownership: D (Direct) Footnotes: [F1] The sale was effected pursuant to a Rule 10b5-l trading plan adopted by the Reporting Person on May 8, 2026. [F2] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $35.00 to $35.255, inclusive. The Reporting Person undertakes to provide to Halliburton Company, any security holder of Halliburton Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4. --- 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 8, 2026. F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $35.00 to $35.255, inclusive. The Reporting Person undertakes to provide to Halliburton Company, any security holder of Halliburton Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4. --- Signature --- /s/ /s/ Sarah I. Rubenfeld, by Power of Attorney (2026-08-19)