What happened

The stock market is having its best day in several weeks on Monday, with the Dow Jones Industrial Average and S&P 500 index up by 2.9% and 2.6%, respectively, as of 10:30 a.m. EDT.

Hotel stocks, especially those with large, group-focused properties, were among the market's best performers. Park Hotels & Resorts (NYSE:PK) was sharply higher, by more than 17%, while Host Hotels & Resorts (NASDAQ:HST) and Ryman Hospitality Group (NYSE:RHP) were higher by 16% and 14%, respectively.

Woman wheeling luggage through a hotel lobby.

Image source: Getty Images.

So what

While there are some company-specific news items -- such as the disclosure of a newly initiated stake in Park Hotels by activist billionaire investor Bill Ackman -- the majority of today's gains can be attributed to positive coronavirus-related news.

Moderna (NASDAQ:MRNA) announced some early results from its coronavirus vaccine trial. The short version is that the vaccine candidate's early stage trial involved 45 participants, and all 45 of them developed antibodies to the virus -- even those who were given the smallest doses. There are more than 100 vaccines under development around the world, and several others are already in clinical trials, but Moderna's data is the first to be released from a human trial.

While this news is understandably causing overall sentiment to rise, you might be wondering why hotel stocks (and these three in particular) are getting such a boost.

One major factor to notice is that all three of these hotel stocks rely significantly on group business. Ryman is the most obvious example, as its Gaylord Hotels contain some of the largest convention spaces in the United States outside the casino industry. Park Hotels owns several major convention-oriented hotels under the Hilton brand, such as the New York Hilton Midtown, Hilton Chicago, and Hilton Orlando. And Host Hotels, the largest hotel real estate investment trust in the world, owns several iconic convention hotels like the Marriott Marquis San Diego Marina, the Orlando World Center Marriott, and many others.

Group business is highly sensitive not only to the economy, but also to concerns about the COVID-19 pandemic. Hotels rely on businesses being willing to spend money, which could certainly take a hit from a prolonged and deep recession. And group events are places where viruses can be easily transmitted -- this is why concerts, conventions, and other large gatherings were among the first things to get shut down as the pandemic worsened earlier this year.

Now what

The point is that groups have been canceling events ever since the COVID-19 pandemic hit. Through April 22, Ryman has experienced more than 860,000 room-night cancellations for future events, just to name one example. And many experts say that while demand might rebound somewhat as economies start to reopen, we likely won't see things truly return to normal until there's a readily available vaccine.

While we're a long way from the finish line in the fight against COVID-19, the positive results from Moderna's vaccine trial are certainly an encouraging sign that there's light at the end of the tunnel.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.