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Data; FactSet; Chart: Axios Visuals

The surge in Texas health care company Signal Advance continued on Monday as the stock rose by 438%, after previously gaining 1800% during one 24-hour period.

The catalyst: A Thursday tweet from Tesla CEO Elon Musk that said simply, “Use Signal.” Musk was recommending the encrypted messaging service (an independent 501c3) that competes with Facebook's WhatsApp, but a frenzy ensued in Signal Advance (SIGL) nonetheless that has continued for days.

By the numbers: The company's market cap has risen from around $7 million last week to more than $659 million as of Monday's close, according to FactSet.

The bottom line: Strategists think this may be another sign of the overall mania in stock prices. BofA's chief investment strategist Michael Hartnett notes cynically, extreme asset bubbles have been the "natural end to nihilistic bull markets of [the] past decade."

  • This one is unlikely to be different, GMO's Grantham writes. "The combination of timing uncertainty and rapidly accelerating regret on the part of clients means that the career and business risk of fighting the bubble is too great for large commercial enterprises."
  • "They can never put their full weight behind bearish advice even if the P/E goes to 65x as it did in Japan."

Go deeper

Dion Rabouin, author of Markets
Jan 28, 2021 - Economy & Business

How GameStop exposed the market

Illustration: Eniola Odetunde/Axios

Retail traders have found a cheat code for the stock market, and barring some major action from regulatory authorities or a massive turn in their favored companies, they're going to keep using it to score "tendies" and turn Wall Street on its head.

What's happening: The share prices of companies like GameStop are rocketing higher, based largely on the social media organizing of a 3-million strong group of Redditors who are eagerly piling into companies that big hedge funds are short selling, or betting will fall in price.

Read: Former Vice President Walter Mondale's last message

Photo courtesy of Mondale.

Former Vice President Walter Mondale wrote a farewell letter to his staff, sent upon his death on Monday, thanking them for years working together.

Dear Team,

Well my time has come. I am eager to rejoin Joan and Eleanor. Before I Go I wanted to let you know how much you mean to me. Never has a public servant had a better group of people working at their side!

Together we have accomplished so much and I know you will keep up the good fight.

Joe in the White House certainly helps.

I always knew it would be okay if I arrived some place and was greeted by one of you!

My best to all of you!

Fritz

Former Vice President Walter Mondale dies at 93

Walter Mondale, left, with former President Jimmy Carter in Jan. 2018 at the McNamara Alumni Center on the University of Minnesota's campus in Minneapolis. Photo: Anthony Souffle/Star Tribune via Getty Images

Walter Mondale, who transformed the role of U.S. vice president while serving under Jimmy Carter and was the Democratic nominee for president in 1984, died Monday at 93, according to a family spokesperson.

The big picture: President Biden, who was mentored by Mondale through the years, said in 2015 that the former vice president gave him a "roadmap" to successfully take on the job.