S&P 500 Gains and Losses Today: Amazon Stock Surges as Cloud Business Boosts Earnings; DexCom Drops
- Amazon, the world’s largest online retailer, saw its stock hit a record high on October 31, 2025, fueled by strong performance in its cloud computing division.
- The company’s Amazon Web Services (AWS) unit delivered better-than-expected quarterly results, reinforcing investor confidence in its AI infrastructure strategy.
- DexCom shares plunged after the glucose monitoring device maker issued a cautious revenue forecast, raising concerns about future growth in the medical device sector.
Key Takeaways
Amazon stock hit a record high on strong cloud earnings, while DexCom and Erie Indemnity declined on cautious forecasts and insurance losses.
Shares of a top-tier online retail and cloud infrastructure company surged on the last trading day of October, while a prominent medical tech firm saw its stock tumble after signaling slower growth in 2026.
Major U.S. indexes ended the week on a high note, buoyed by the Federal Reserve’s latest interest rate cut and a breakthrough in U.S.-China trade negotiations. The Dow Jones Industrial Average edged up 0.1%, the S&P 500 climbed 0.3%, and the Nasdaq Composite rose 0.6%, with all three benchmarks locking in gains for both the week and the month.
Amazon (AMZN) stock soared nearly 10% to a new all-time high after the company posted robust Q3 earnings. The standout performance came from Amazon Web Services, which continues to dominate the cloud computing space. CEO Andy Jassy spotlighted aggressive investment in artificial intelligence infrastructure to support surging enterprise demand.
First Solar (FSLR) led the S&P 500 with a 14% rally, despite falling short on earnings-per-share estimates. The solar panel manufacturer beat revenue expectations, driven by strong demand from U.S. renewable energy developers. The company also unveiled plans for a new production facility with a 3.7-gigawatt annual output capacity, reinforcing its clean energy expansion.
Coinbase Global (COIN) advanced nearly 5% after surpassing Wall Street’s revenue and earnings projections. The crypto exchange cited a spike in trading activity from both individual and institutional investors. CEO Brian Armstrong emphasized the firm’s strategic pivot toward prediction markets and tokenized assets as part of its broader “everything exchange” initiative.
DexCom (DXCM) shares plunged nearly 15%, marking the steepest drop in the S&P 500. While the glucose monitoring company met Q3 expectations, executives issued a cautious outlook for 2026 revenue. They also addressed concerns surrounding the G7 sensor, noting recent improvements and enhancements to customer support.
Erie Indemnity (ERIE) declined 5.5% after delivering mixed quarterly results. Although earnings per share topped forecasts, revenue came in below expectations. Company leadership attributed the shortfall to underwriting losses in auto and homeowners insurance, largely due to a rise in severe weather-related claims.
