Markets on Wall Street and in Europe declined rapidly early Friday morning after President Donald Trump posted a pair of tariff threats on social media, one aimed at Apple and the other at the European Union.

The US stock market is seeing a slight downturn as President Doanld Trump proposes a new round of tariffs on the European Union (EU) and tech giant Apple.

Wall Street had its worst week since early April after President Trump said he would impose steep tariffs on E.U. goods and targeted Apple with a tax on foreign-made iPhones.

Amgen is no exception to this dynamic. Although 2017's Tax Cuts and Jobs Act spurred the company to build a handful of new manufacturing sites within the U.S., it's still heavily reliant on its production facilities in Singapore and Ireland to make many of its drugs, including generics.

Stocks fell in Europe while bonds rallied as US President Donald Trump threatened a 50% tariff on the European Union starting in June.The Stoxx Europe 600 Index slid 0.9% by the close in London, with tariff-exposed autos among the biggest decliners,

Shorting stocks has been a coin-flip in 2025, with almost 50% of short positions unprofitable this year, S3 Partners said.

U.S. stock futures pointed to slight losses early on Tuesday after eking out gains the previous day. The market looks to have largely shrugged off the latest downgrade of the U.S.’s credit rating and is looking for a new catalyst.

Shares of Ross Stores sank Friday, a day after the discount retailer pulled its full-year outlook due to the uncertainty caused by the Trump administration's shifting tariff policies.