Stellantis is trading 4.3% lower at $4.42, with no fresh company-specific announcement identified on September 29 to explain the decline. - Announced fuel-economy rule changes are major auto-industry news, but sources do not link them to this session’s drop. - Broader markets are mixed: the S&P 500 is down 0.25%, the Dow is down 0.61%, and the Nasdaq is up 0.04%. - Higher yields, oil prices, and weaker consumer-confidence data may weigh on sentiment, but a link to Stellantis’ decline is unconfirmed.