The company said that it has expanded its existing relationship with chip giant Nvidia (NASDAQ: NVDA) to design and develop custom silicon for its upcoming Level 4 self-driving truck system. What happened Shares of TuSimple Holdings (NASDAQ: TSP) were trading lower on Monday afternoon amid a broad-based sell-off driven by concerns about rising interest rates. There was no news moving the company's stock lower on Monday; rather, it appeared to be caught in a broad sell-off of technology names triggered by concerns about inflation and interest rates.