Discover Thomson Reuters By Reuters Staff 1 Min Read SAO PAULO, May 11 (Reuters) – Itaú Unibanco Holding SA said it is still in talks to acquire a stake in Brazilian broker XP Investimentos SA, adding that no definitive agreement has been signed. In a securities filing on Thursday, Brazil´s largest lender by assets denied a report by O Estado de S. Paulo newspaper that a deal had already been struck. XP Investimentos SA filed a request on Wednesday with Brazilian securities industry watchdog CVM for an initial public offering. (Reporting by Tatiana Bautzer) Our Standards: The Thomson Reuters Trust Principles. All quotes delayed a minimum of 15 minutes. See here for a complete list of exchanges and delays.