US benchmark equity indexes ended mixed Monday after President Donald Trump threatened more tariffs on Chinese imports.

* Trump said his administration would impose additional 50% tariffs on China, effective Wednesday, unless Beijing reverses its recent retaliatory actions.

* "Additionally, all talks with China concerning their requested meetings with us will be terminated!" Trump said in a Monday social media post. "Negotiations with other countries, which have also requested meetings, will begin taking place immediately."

* Wells Fargo Investment Institute lowered its 2025 target level for the S&P 500 and cut earnings estimates for companies that are part of the index to reflect a projected US economic slowdown amid an aggressive tariff policy.

* May West Texas Intermediate crude oil closed down $0.91 to settle at $61.09 per barrel, while June Brent crude, the global benchmark, was last seen down $1.01 to $64.61 on the continuing market turmoil that followed Trump's decision to impose widespread tariffs on the country's trading partners.

* Dollar Tree (DLTR) was up 7.6%, as Citigroup upgraded the discount retailer's stock to buy from neutral and adjusted its price target to $103 from $76.

* Trump's latest reciprocal tariffs pose major challenges for Apple (AAPL) and Tesla (TSLA) as the duties are likely to create cost and demand headwinds for the tech giants, Wedbush Securities said. Apple shares were down 3.7%, while Tesla fell 2.6%.