Publicly traded since September, Arm Holdings PLC (NASDAQ:ARM) stock is hitting record highs today, after reports that it will join the Nasdaq-100 Index (NDX), effective June 24, 2024. At last glance, ARM was up 4% at $164.42, earlier hitting a peak of $167.69.The semiconductor name has been shooting higher lately, with only two negative closes since the start of June. In mid-May, tailwinds came from reports that the company hopes to launch its first artificial intelligence (AI) chip next year. Year-to-date ...