HSBC Holdings (HSBA.L), JPMorgan (JPM.N) and Credit Agricole (CAGR.PA) will seek to fight European Union charges of rigging financial benchmarks at a closed door hearing in June, two people familiar with the matter said on Friday. The European Commission accused the three banks in May last year of manipulating the Euribor interbank offered rate after they refused to settle a case five months earlier, unlike six other banks.