The FTSE 100 index of top British firms ended up 0.2% at a fresh closing peak, though off its intraday high. Trading volumes were thin due to a U.S. market holiday. Trump, who has pledged to sign a flurry of executive orders concerning immigration, energy and tariffs on his first day in office, is being sworn in as U.S. president.

London's blue-chip FTSE 100 traded near all-time highs on Monday as investors awaited Donald Trump's return to the White House for fresh insights on his stance on tariffs and international relations.

Analysis of FTSE 100's 2025 outlook now that it has risen to a new all-time high, examining key drivers including P/E ratios, dividend yields, sterling weakness and technical factors that could push the index to 9,

London’s FTSE 100 hit a record high Friday, as international exposure in the equity index shielded it from much of the turmoil that has weakened the pound, gilts and domestic stocks.

The dollar fell on Monday amid reports Mr Trump would not sign trade tariffs into law on his first day back in the White House.