Top Stock Movers – January 27, 2026
U.S. stocks finished mixed Tuesday, with strength in tech and industrials offset by steep losses in health insurers. Below are the biggest stock movers by percentage driving the market.Top Gainers
General Motors (GM) ▲ +9.3%
GM shares jumped after the automaker beat fourth-quarter earnings estimates, raised its dividend, and announced a $6 billion share buyback, boosting confidence in its 2026 outlook.
Cloudflare (NET) ▲ +11.1%
The stock surged after the company launched a new AI assistant, reinforcing optimism around AI-driven demand for cloud infrastructure.
Micron Technology (MU)▲ +6.8%
Micron rallied after announcing plans to invest $24 billion in a new memory chip manufacturing facility in Singapore, as AI-related memory shortages persist.
RTX Corporation (RTX)▲ +3.4%
Shares climbed after the CEO said the defense contractor would continue paying dividends despite political pressure and a new executive order targeting capital returns.
Top Losers
UnitedHealth Group (UNH) ▼ −19.8%
UnitedHealth tumbled after proposed Medicare payment rates came in far below expectations, overshadowing a quarterly earnings beat and dragging the Dow sharply lower.
Humana (HUM) ▼ −18.9%
Shares sank alongside peers as investors reacted to flat Medicare Advantage rate increases for future years.
CVS Health (CVS) ▼ −13.8%
CVS fell as the health insurance sector sold off broadly on concerns over margin pressure tied to government reimbursement rates.
Pinterest (PINS) ▼ −7.5%
The stock dropped after the company announced plans to lay off 15% of its workforce and restructure operations to prioritize AI investments.
Fat Brands (FAT) ▼ −39.5%
Shares collapsed after the restaurant operator filed for Chapter 11 bankruptcy, citing heavy debt obligations and missed interest payments.
Market Context
Tech-led gains pushed the Nasdaq higher, while the S&P 500 edged toward record levels. The Dow Jones Industrial Average lagged after UnitedHealth’s plunge erased gains from other components. Investors remain focused on earnings from megacap tech companies and the Federal Reserve’s upcoming policy decision.
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