CarParts.com disclosed in its quarterly filing that one of the big e-commerce sites it sells through sent a letter in October saying it will end their seller relationship once CarParts.com launches its own marketplace, which the partner called a conflict of interest. That marketplace, CarParts Connect, is built on Mirakl, opens in December, and will let outside sellers list vehicle accessories, electronics, pet products, and outdoor gear for a 15% commission. The filing doesn’t name the partner, but third-party marketplaces such as eBay and Amazon generated 30.3% of CarParts.com’s revenue through the first three quarters of 2026, or about $120.3 million. CarParts.com said it expects to negotiate with the partner over the next several months but can’t promise a resolution.
