Cox Automotive released its Q3 2026 sales forecast yesterday, Sept. 24, which is not music to the ears of the Detroit Big 3. Of the lot, it expects only Stellantis (STLA) to gain market share in the first three quarters of the year while forecasting losses for both General Motors (GM) and Ford (F). Importantly, it expects the combined market share of the three to fall to around 36%, an all-time low.