Tesla shares, which had hovered near record-highs, lost about a quarter of their value after Musk said on Nov. 6 he would sell 10 percent of his stake if Twitter users agreed.
The Biden administration finalized a reversal of a Trump-era rule that sought to pre-empt California’s vehicle emissions regulations.
Three dealership groups have expanded in Mississippi, South Carolina and Pennsylvania with acquisitions that closed this month.
NHTSA’s investigation includes 580,000 Tesla vehicles sold since 2017 over the automaker’s decision to allow games to be played on the front center touchscreen.
The dealership denied all allegations and admits no liability under the settlement.