MANILA, Philippines — Oil giant Petron Corp. is seeking to refinance its $750-million securities listed on The Stock Exchange of Hong Kong Ltd. In a disclosure to the Philippine Stock Exchange yesterday, Petron was cleared by its executive committee to seek permission from holders of the $750-million securities as it seeks to amend the trust deed dated Feb. 6, 2013 to issue new undated capital securities. The company said it intends to issue new undated capital securities to repurchase, refinance and/or redeem the 2013 securities.