The Sports Business Journal reported Friday that Lowe's will not renew its 11-year sponsorship of the 1.5-mile oval outside Charlotte, formerly known as Charlotte Motor Speedway.
SMI president and CEO Marcus Smith said both sides are still negotiating and that he remains confident a deal will be completed soon.
The track hosts several NASCAR events each year, including a pair of Sprint Cup races and the series' All-Star race.
Lowe's is also the primary sponsor of three-time defending Sprint Cup champion Jimmie Johnson. That deal expires at the end of the 2010 season.