HALLIBURTON CO — Capital/Financing Update 2011

Sep 19, 2011

19-SEP-2011 12:24 FROM FSA UK LISTING AUTHORITY TO 902078624800 P.01/02

Financial Services Authority

FSA

Local Fax:

Date:	19 September 2011
To:	Hannah Mahon
Company:	ORRICK, HERRINGTON and SUTCLIFFE
Fax number:	020 7862 4800
From:	Istaqur Rahman
Department:	UK Listing Authority
Telephone number:	020 7066 8218
Total number of pages (including this page):	2

Message: Please find attached approved front cover for Halliburton Prospectus.

Confidentiality Note

This fax and the information it contains, which may be privileged and/or confidential, is for the use of the addressee(s). The unauthorised use, disclosure or copying of this fax or such information is strictly prohibited and could, in certain circumstances, be a criminal offence. If you are not the/un addressee, and are in possession of this fax (or any copy) without the consent of any addressee, please notify us immediately by telephone at +44 (0)20 7066 1000. (NB. If you do not receive all papers or they are illegible, please inform us immediately)

The Financial Services Authority 25 The North Columnade Canary Wharf London E14 5HS, United Kingdom Telephone +44 (0)20 7066 1000 Fax +44 (0)20 7066 1099 Registered as a Limited Company in England and Wales No 1920823. Registered office as above

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19-SEP-2011 12:25 FROM FSA UK LISTING AUTHORITY TO 902078624800 P.02/02

THIS DOCUMENT IS IMPORTANT AND REQUIRES YOUR IMMEDIATE ATTENTION. If you are in any doubt about the contents of this document, you should consult an independent financial adviser authorized under the Financial Services and Markets Act 2000 who specializes in advising on the acquisition of shares and other securities before you take any action.

This document comprises a supplementary prospectus which supplements and updates the prospectus (comprising a combined summary, share registration document, and share securities note) approved by the UK Financial Services Authority ("FSA") on June 8, 2011 (the "Prospectus") in accordance with the requirements of the Financial Services and Markets Act 2000 and the Prospectus Rules of the FSA. References to the "Prospectus" shall be deemed to include the Prospectus as supplemented and updated by this supplementary prospectus, and any further amendment or supplement thereto.

The Prospectus has been issued by Halliburton solely in relation to the acquisition from time to time of Common Stock by eligible employees of the Group within the United Kingdom (and, pursuant to Article 17 of the Prospectus Directive, within the EEA) pursuant to the relevant Stock Plan and not for any other purpose. Only eligible employees of the Group may acquire Common Stock pursuant to the Prospectus, in accordance with the Plan Documents. The offer(s), the subject of the Prospectus, are not made to the general public or any person other than an eligible employee of the Group. Your attention is drawn to the Risk Factors on page 10 of the Prospectus.

The maximum cap on the aggregate number of shares of Common Stock available for purchase by Participants under the Stock Plans, at December 31, 2010, was 45.3 million.

The persons responsible for this document are Halliburton Company and the Directors of Halliburton Company, whose names appear at paragraph 1 of this document. Having taken all reasonable care to ensure that such is the case, the information contained in this document is, to the best of the Directors' and the Company's knowledge, in accordance with the facts and contains no omission likely to affect its import.

No Common Stock or other securities of Halliburton Company are admitted to trading on or regulated market within the EEA, and there is no intention to make application for the Common Stock, the subject of the Prospectus to be admitted to trade off any such regulated market.

Investing in the Common Stock involves risks, as set out in the Prospectus.

UK Listing Authority

Document approved Date: 19 September 2011 Signed: 1

SUPPLEMENTARY PROSPECTUS

HALLIBURTON COMPANY

(Incorporated in Delaware, USA, whose principal place of business is at 3000 North Sam Houston Parkway East, Houston, TX 77032, USA)

This document does not constitute an offer to sell or the solicitation of an offer to buy or subscribe for Common Stock in any jurisdiction in which such offer or solicitation is unlawful. In particular, this document is not for distribution in or into the United States of America, Canada, Australia, South Africa or Japan or in any country, territory or possession where to do so may contravene local securities law or regulations. Accordingly, the Common Stock may not, subject to certain exemptions, be offered or sold directly or indirectly in or into the United States of America, Canada, Australia, South Africa or Japan or to any national, resident or citizen of the United States of America, Canada, Australia, South Africa or Japan. The distribution of this document in other jurisdictions may be restricted by law, and, therefore, persons into whose possession this document comes should inform themselves about and observe any such restriction. Any failure to comply with these restrictions may constitute a violation of the securities law of any such jurisdiction.

No person has been authorized by Halliburton to give any information or to make any representation not contained in the Prospectus and, if given or made, that information or representation should not be relied upon as having been authorized by Halliburton.

The information contained in the Prospectus is correct only as at the date of the Prospectus (save as the context indicates, and to the extent supplemented and updated by any supplementary prospectus), subject to the requirements of the Prospectus Rules and any other legal and regulatory requirements. Neither any delivery of the Prospectus nor the offering, sale or delivery of any Common Stock will, in any circumstances, create any implication that the information contained in the Prospectus (save in relation to the working capital statement at paragraph 26.1.1 of the Prospectus) is true and accurate subsequent to the date thereof or (as the case may be) the date upon which the Prospectus has been most recently supplemented, or that there has been no adverse change in the financial situation of Halliburton since such date. The Prospectus shall not incorporate by reference any information other than as expressly stated therein, nor shall it incorporate by reference any information published by Halliburton after its date. The most recent financial statements filed by Halliburton and other SEC filings made by Halliburton are available through www.halliburton.com from time to time, but information available via such website and contained in such financial statements and filings shall not be incorporated by reference in the Prospectus.

The Prospectus should not be considered as a recommendation by Halliburton that any recipient of the Prospectus should subscribe for or purchase any Common Stock. Each recipient of the Prospectus will be taken to have made his own investigation and appraisal of the condition (financial or otherwise) of Halliburton and of the Common Stock. No assurances can be given that a liquid market for the Common Stock will exist.

OHS EUROPE 550572(4) 5 TOTAL P.02