Stocks climbed for three sessions on recovering chipmakers and renewed AI optimism, then stumbled as chip supply worries, mounting AI costs, and higher oil prices took over. A critical web vulnerability sent companies scrambling for patches, while American Express’s AI preparation came with job cuts.

Monday ☁️: Stocks climbed as chipmakers recovered, though most sectors finished lower. Amazon rallied after Morgan Stanley made it a top pick on expectations for faster cloud growth. Disc Medicine surged after its blood-disease treatment delivered the trial results regulators wanted.

Tuesday 🧾: Stocks climbed after a soft September jobs report left buyers in control. SpaceX’s revenue surge came with a nearly $20B spending bill. Netflix beat estimates but cut its advertising outlook.

Wednesday 🧠: Chipmakers carried stocks higher as AI optimism returned. Meta and Tesla kept the night moving with earnings, while IBM jumped and Lam Research sold off. A critical AI-discovered web vulnerability turned cybersecurity from a theme into an emergency.

Thursday 🧬: Stocks snapped a three-session winning streak as chip losses overwhelmed strength in defensives. Moderna erased $24B after good vaccine data met a 500% run. Lam Research’s record quarter spread supply-chain worries across semiconductor equipment.

Friday 🔐: Stocks finished lower as AI’s growing costs and renewed Iran fears weighed on the market. Instacart reportedly explored a sale, with Uber and DoorDash among potential buyers. American Express tied workforce cuts to preparing for AI.

Here are the closing prices: 

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Need a concise summary of what's going on this week? Look no further. Here’s a rundown of this week’s earnings and economic data.

Above is a quick summary. Check out the full Stocktwits earnings calendar for the other names reporting this week.

In addition to the above, check out this week's complete list of economic releases.

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