The Euronext 100 Index is the blue chipindex of the pan-European exchange, Euronext NV. A blue chip stock is the description of the stock of well-established companies having stable earnings and no extensive liabilities. ... Look up Index in Wiktionary, the free dictionary. ... Euronext N.V. is a pan-European stock exchange with subsidiaries in Belgium, France, Netherlands, Portugal and the United Kingdom. ...