Markets might be celebrating but every single portfolio manager is trying to figure out how long the roller coaster will last

Stock markets erupted with a torrential surge of optimism following President Donald Trump’s post on Truth Social pausing some of his tariffs, and comments from Treasury Secretary Scott Bessent reassuring the world that the U.S. is not embroiled in a trade war.

Despite the brief respite from the carnage of the week, though, a chilling uncertainty looms over the next 90 days.

“Every portfolio manager is trying to figure out whether you can draw a straight line to future negotiations,’” said Jake Schurmeier, portfolio manager at Harbor Capital and a former member of the Federal Reserve Bank of New York’s Markets Group. “We get another 90 days before we have to do this song and dance again.”

To level set: President Trump announced a bevy of tariffs during a Rose Garden address last week that had been telegraphed since his campaign. Investors had priced in tariffs and the subsequent impact on trade policy, but the extent of the tariffs was greater than expected . Markets plummeted in the trading days after Trump’s announcement. The word “recession”—typically avoided at all costs—became a talking point, and the chances of the U.S. stumbling headlong into one rose , according to JPMorgan Chase , whose CEO Jamie Dimon announced publicly that a recession was a “likely outcome” after the tariff tumult. Trump said Dimon’s comments factored into his decision to issue the partial pause on Wednesday.

Following Trump’s announcement, markets staged a gravity-defying rally, with the Nasdaq ending the day up 12%, while the S&P 500 rose more than 9%.

Michael Orlando, executive director in the J.P. Morgan Center for Commodities and Energy Management at the University of Colorado Denver, told Fortune the tariff pause is a relief, mostly from uncertainty, which had continued to weigh on equity prices. But the bigger development , which emerged over the weekend, was that U.S. Treasuries “stopped looking like a safe harbor in a time of uncertainty and started looking like a risky bet, themselves,” Orlando said.

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