Moderna (NASDAQ: MRNA) has had quite a year. Developing a vaccine that could help to bring about the end of a pandemic apparently has a way of boosting a company's stock price. So how much good fortune has Moderna produced for its shareholders in 2020? Let's review. Image source: Getty Images. Moderna delivered a much-needed ray of hope to the world in November, when a phase 3 clinical trial showed its coronavirus vaccine candidate, mRNA-1273, to be 94.1% effective against COVID-19 -- and as much as 100% effective at preventing severe cases of the disease. In addition, Moderna's vaccine was found to be generally safe and well-tolerated, with no serious safety concerns identified among the study's more than 30,000 participants. The world cheered. And investors reacted by bidding up Moderna's shares, which were already up sharply year to date at that point based on the prior progress of its coronavirus vaccine development efforts. All told, as of 11:45 a.m. EST on Dec. 31, Moderna's stock price is up 446% in 2020. So, for every $1,000 you invested in Moderna back in January, you'd have nearly $5,500 today. Yet even more gains may be in store for Moderna investors in 2021. The biotech company plans to use the profits it earns from sales of mRNA-1273 to fund the development of new vaccines for other diseases. Should one or more of them prove safe and effective, Moderna -- and its shareholders -- could have more great years to come. 10 stocks we like better than Moderna INCWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Moderna INC wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of November 20, 2020 Joe Tenebruso has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source