04:03 PM EDT, 03/31/2025 (MT Newswires) -- US benchmark equity indexes ended mixed Monday ahead of the reciprocal tariff announcements from the Trump administration this week.

* President Donald Trump will likely announce an average 15% reciprocal tariff, adding 9 percentage points to the effective tariff rate after exemptions, Goldman Sachs said in a note to clients.

"Along with tariffs imposed to date and sectoral tariffs we still expect, this would result in a 15 [percentage point] total increase," the investment firm said. Its previous estimate was a 10 percentage-point increase in the effective tariff rate.

* The Institute for Supply Management's Chicago PMI reading rose to 47.6 in March from 45.5 in February, higher than the expected 45 print in a survey compiled by Bloomberg but still indicating contraction in the sector. The sub-50 reading matches almost all the other regional manufacturing data already released for March. The national ISM manufacturing index for March will be released on Tuesday.

* May West Texas Intermediate crude oil closed up $2.13 to settle at $71.49 per barrel, while May Brent crude, the global benchmark, was last seen up $1.11 to $74.74 after U.S. President Donald Trump threatened to impose secondary tariffs on buyers of Russian oil as Vladimir Putin, his Russian counterpart, continues to violate a ceasefire agreement with Ukraine brokered by the United States.

* Newsmax ( NMAX ) debuted on the New York Stock Exchange, selling 7.5 million Class B shares at $10 apiece. Shares surged 722%.

* The shares of several vaccine makers, including Moderna ( MRNA ) , slumped after Peter Marks, the US Food and Drug Administration vaccine chief, resigned late Friday, citing conflicts with Health and Human Services Secretary Robert F. Kennedy Jr.

Moderna ( MRNA ) was down 9.2%.