Grupo Petersen obtained another 0.1% in YPF stock the following year, and in 2011 it purchased an additional 10% stake, funding the deal with a $700 million senior secured loan from a group of banks led by Banco Itau and Credit Suisse. Repsol pitched in with another loan of about $625 million, according to Gottlieb.
Last month, Grupo Petersen missed a $400 million loan payment, which triggered default provisions in the financing agreements with its creditors.
Earlier Friday, a spokesman for Mexican billionaire Carlos Slim confirmed that Slim had obtained an 8.4% stake in YPF.
Arturo Elias Ayub told Dow Jones Newswires the shares were collateral for a more-than-four-year-old syndicated bank loan in which Mr. Slim's banking firm Grupo Financiero Inbursa SAB (GPFOY, GFINBUR.MX) participated.