Investopediaยท2025-10-03 21:50Group 1: Health Insurance Sector - Humana (HUM) shares surged nearly 11% after the company affirmed its outlook and provided insights into the quality ratings of its Medicare Advantage plans, leading to strong performance in the S&P 500 [4][9] - Other health insurers also experienced gains, with Centene (CNC) and Cigna (CI) rising by 5.1% and 4.7%, respectively, following Humana's positive update [4] Group 2: Technology Sector - Palantir Technologies (PLTR) shares fell 7.5% after reports indicated vulnerabilities in a battlefield communications network being developed by the company, leading to concerns about security [6][9] - Zebra Technologies (ZBRA) saw a 3% increase in shares after completing the acquisition of Elo Touch Solutions, which is expected to expand its addressable market [5] Group 3: Casino and Gaming Industry - Shares of casino operators declined as Tropical Cyclone Matmo posed a threat to Macau, a key gaming destination, with Las Vegas Sands (LVS) and Wynn Resorts (WYNN) both dropping over 7% [7] Group 4: Retail Sector - Nike (NKE) stock decreased by 3.5% despite reporting better-than-expected sales and profits for its fiscal first quarter, as the company warned of higher tariff costs and declining sales in its classic footwear lines [8]