Wall Street wobbles near a record as insurers plunge and a Meta-Corning data-center deal lifts tech-linked shares

A market pulled in two directions

U.S. stocks traded unevenly Tuesday as the S&P 500 hovered close to its all-time high, but the day’s gains were far from broad-based. Big drops in health insurers weighed on the Dow, while strength in tech-linked shares and select earnings winners helped support the broader market mood.

The mixed action reflected a familiar pattern for late-cycle markets: a few heavyweight movers can swing index-level performance even as many stocks fall underneath. Traders said the session felt like a tug-of-war between defensive concerns about health-care policy and optimism around corporate spending on AI-era infrastructure.

Insurers tumble on guidance and Medicare Advantage worries

Health insurers were among the biggest drags after UnitedHealth slid sharply following results and forward-looking commentary that investors read as disappointing. The move rippled across peers, with other companies in the sector also falling as the market digested how government payment assumptions and utilization trends might affect 2026 profitability.

Market participants also pointed to policy uncertainty around Medicare Advantage rates as a key headline driver. Even without a single definitive catalyst, investors treated the setup as a warning that margins could remain under pressure, prompting a swift repricing of the group.

Tech infrastructure gets a boost from Meta-linked spending

On the positive side, Corning jumped after announcing a deal valued at up to $6 billion with Meta Platforms tied to optical fiber and cable used in data-center buildouts. The agreement helped reinforce a narrative that AI and cloud demand are pushing a new wave of investment in the physical backbone of computing, from chips to networking to fiber.

Other corporate news also shaped trading. General Motors gained after reporting results that topped expectations and outlining additional shareholder returns, while UPS rose even as it detailed significant job cuts as part of a broader turnaround effort. American Airlines fell after an earnings update that investors judged as underwhelming.

What investors are watching next

Beyond individual earnings, traders focused on the Federal Reserve’s upcoming decision and commentary on rates and inflation. With several mega-cap tech names scheduled to report later in the week, the next set of results and forward guidance could determine whether the market’s push toward record levels broadens—or stays concentrated in a smaller group of winners.

• A Federal Reserve decision and updated signals on the path of rates
• Earnings and outlooks from major tech companies later this week
• How health insurers respond to reimbursement and cost-trend uncertainty
• Whether AI infrastructure spending continues to show up in corporate dealmaking