A close friend of President Francois Mitterrand was implicated in the scandal over suspected insider trading Saturday when a published report said he had acquired 50,000 shares of an American firm at the center of the growing controversy.

Le Monde said Roger-Patrice Pelat, a business executive and close associate of Mitterrand, bought shares in Triangle Industries Inc. shortly before Pechiney, a state-run French aluminum company, completed a friendly takeover of the American firm last November.The newspaper said Mitterrand was informed Friday of Pelat's holdings in Triangle.