Shares of Moderna Inc.
MRNA,
-6.80%
were down 6.6% in trading on Monday after the company announced an updated supply deal for its COVID-19 vaccine with Canada. As part of the new terms, Moderna will supply up to 105 million doses and possibly its booster shot through 2024. This includes up to 35 million doses for each year. Moderna's stock has gained 247.4% so far this year, while the broader S&P 500
SPX,
-0.22%
is up 18.9%.