DUBAI, May 20 (Reuters) - Saudi Arabia's stock market regulator said on Wednesday it had cancelled approval for a flotation by Arabian Contracting Services Co at the advertising firm's request.

The Capital Market Authority said the company had discovered "new material information" which was not disclosed in its draft prospectus, and which needed to be assessed for its impact on operations and financial performance. It did not elaborate.

Last week, approval was issued for the sale of a 30 percent stake in Arabian Contracting, with the offer set to run between June 10 and 16. ID:nL5N0Y453S

(Reporting by David French; Editing by Andrew Torchia) ((davidj.french@thomsonreuters.com; +971 4 362 5864; Reuters Messaging: davidj.french.thomsonreuters.com@reuters.net))

Keywords: ARABIAN CONTRACTING SERVICES IPO/