Moderna Leads S&P 500 With 663% Gain in 2026

Moderna stock has gained 663% in 2026, outpacing AI companies for the best performance in the S&P 500. The company is scheduled to release complete cancer vaccine data on October 24. Its shares are tied to its COVID vaccine business.
Moderna's 663% gain in 2026 makes it the S&P 500's top performer, ahead of AI companies. The company is scheduled to release complete cancer vaccine data on October 24.
Its shares are tied to its COVID vaccine business, so the stock's performance remains connected to that franchise as the cancer vaccine data release approaches.
The news could affect patients, investors, and public-health observers. A strong cancer vaccine data readout may shape confidence in vaccine developers and biotech stocks, while disappointing results could temper it. Because Moderna's shares are tied to its COVID vaccine business, moves in the stock may also touch index investors and retirement accounts with S&P 500 exposure. Patients and health systems could watch for potential new cancer tools, though the actual impact remains uncertain.