CUPERTINO, Aug. 4 -- Before she interviewed at OpenAI, Yu-Ting Peng met privately with colleagues who had already made the same jump. During that meeting, according to a new court filing, they discussed confidential Apple information about products that had not yet been announced.

That detail, buried in Apple's latest brief in its trade secrets lawsuit, underscores how far the case has expanded since Apple first filed suit in June. The company now believes at least 13 former employees, far more than the two named in its original complaint, may have played some role in transferring proprietary technology to OpenAI or to Jony Ive's device startup, io.

Apple filed a motion for a preliminary injunction on Tuesday, the first time it has depl...