Tranche Update on Halliburton Company's Equity Buyback Plan announced on February 16, 2006.

Halliburton Company is one of the world's leading providers of oil-related services. Net sales break down by activity as follows: - construction and production services (59.5%); - drilling and inspection services (40.5%). Net sales break down by source of income between sales of services (71.6%) and of products (28.4%). Net sales are distributed geographically as follows: North America (45.6%), Middle East and Asia (24.7%), Latin America (17.3%) and other (12.4%).