GM’s second quarter sales were down 15% year over year, but market share was up 1 point to an estimated 16.3% (J.D. Their estimated retail market share was 44%. The GMC Sierra HD, which was up 31% in the quarter, delivered its best second quarter and first half on record. The second quarter SAAR was an estimated 13.4 million light vehicles compared to 17 million a year ago. However, GM’s second quarter vehicle wholesale volumes were impacted by the ongoing semiconductor supply shortage and other supply chain disruptions mostly in June.