These Stocks Moved the Most Today: Tesla, Amazon, Moderna, Fair Isaac, Exxon, Sunrun, SoFi, Datadog, and More

Traders work on the floor of the New York Stock Exchange. (Michael M. Santiago/Getty Images)

Stocks were mixed on Tuesday after President Donald Trump said he wouldn’t delay the date when his tariffs will take effect.

“TARIFFS WILL START BEING PAID ON AUGUST 1, 2025. There has been no change to this date, and there will be no change,” Trump posted on Truth Social.

These stocks made notable moves:

Tesla rose 1.3% after falling 6.8% on Monday. Shares have declined 25% this year. CEO Elon Musk announced over the weekend that he would form a new political party, and his return to politics prompted investors to sell the stock. Musk strongly opposed Trump’s tax-and-spending bill that was signed into law Friday. The legislation removes purchase tax credits worth up to $7,500 for qualifying electric vehicles.

Amazon.com fell 1.8%. The company’s members-only, four-day Prime Day sale runs through July 11. For the first time in its decadelong history, the sale will run for four days, instead of two. Justin Post, an analyst at BofA Securities, said Prime Day could generate more than $21 billion in gross merchandise value, up 60% from last year.

Shares of Exxon Mobil rose 2.8%, even after the energy giant warned that second-quarter earnings could take a hit of $800,000 to $1.2 billion from lower crude prices and $300,000 to $700,000 from lower gas prices.

Sunrun fell 11%, Enphase Energy was down 3.6%, and First Solar declined 6.5% after the White House said it would “rapidly eliminate the market distortions and costs imposed on taxpayers by so-called ‘green’ energy subsidies.” Sunrun was upgraded to Sector Weight from Underweight at KeyBanc and Enphase Energy was downgraded to Hold from Buy at TD Cowen.

Moderna, up 8.8%, was the best-performing stock in the S&P 500.

Fair Isaac sank 8.9%. Bill Pulte, the director of the Federal Housing Finance Agency, said Tuesday on social media that Fannie Mae and Freddie Mac will allow lenders to use the VantageScore 4.0 credit scoring model. Credit bureaus Equifax, Experian, and TransUnion are the creators of VantageScore.

Datadog slipped 4.5% after it was downgraded to Sell from Neutral at Guggenheim with a $105 price target. The analysts said they made the call “ahead of potential significant optimization by OpenAI, which we believe is Datadog’s largest customer.” Guggenheim said its “tactical positioning is based on our belief that OpenAI’s observability software road map is shifting towards more cost efficient, in-house managed technologies, and our model setup that indicates 2H risk.”

SoFi Technologies gained 3.7% after the fintech expanded access to alternative investments to include new private markets funds from asset management firms like Cashmere, Fundrise, and Liberty Street Advisors.

Nvidia rose 1.1%. The maker of artificial-intelligence chips declined 0.7% on Monday and ended the session with a market capitalization of $3.861 trillion.

Merit Medical Systems said it expects second-quarter revenue of $380 million to $384 million, better than analysts’ forecasts of $372.5 million, and named Martha Aronson as chief executive and president. She will succeed Fred Lampropoulos, who founded the company in 1987 and has been chief executive since then. Shares climbed 4.6%.

Write to Joe Woelfel at joseph.woelfel@barrons.com and Mackenzie Tatananni at mackenzie.tatananni@barrons.com