Check out the companies making headlines before the bell. Nvidia — The semiconductor firm’s stock rose 0.5% after it agreed to pay $20 billion to acquire assets from artificial intelligence startup Groq, marking its largest purchase ever. Micron Technology , SanDisk — The digital memory firms’ stocks were up after DigiTimes reported , citing industry sources, Samsung Electronics and SK Hynix are raising prices for their fifth-generation high-bandwidth memory 3E chips by nearly 20% for 2026 deliveries. Micron Technology rose nearly 2%, while SanDisk jumped 4%. Airline stocks — Shares of airlines fell as a winter storm threatened to foil flight schedules. United Airlines and American Airlines edged down slightly.