FTSE 100 Flat as Tariff Announcements Weigh; FTSE 250 Jumps

The FTSE 100 was little changed on Monday as markets absorbed fresh trade tensions following the U.S. Supreme Court’s decision to strike down President Donald Trump’s emergency tariffs.

Trump responded by imposing a sweeping 15% levy, leaving investors cautious. The DAX slipped 0.3% and the CAC 40 was flat.

By contrast, the FTSE 250 outperformed, rising 0.7% as domestically focused stocks found support despite the global trade uncertainty.

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JD Sports led the blue-chip risers, surging 6% after unveiling a £200 million share buyback programme. Gold’s advance also lifted precious-metals producers, with Fresnillo up around 3.9% and Endeavour Mining gaining roughly 3.4%. These three shares make up the day’s strongest FTSE 100 performers.

On the downside, Mondi fell 2.4%, while BAE Systems and Whitbread declined 1.2% and 1.1%, respectively.

In the FTSE 250, Raspberry Pi was the standout, jumping 7.6% as momentum continued following speculation that its devices could play a growing role in lower-cost artificial-intelligence applications.

MONY Group was the next-strongest performer, up 4.3%, after reporting record annual revenue and adjusted EBITDA for 2025 and reaffirming its commitment to shareholder distributions.

The biggest mid-cap faller was Johnson Matthey, which dropped after the chemicals group said it had agreed to reduce the sale price of its catalyst technologies division to £1.33 billion.

The company also extended the deadline for the Honeywell-led takeover and now expects to return £1 billion to shareholders through a combination of a special dividend and a buyback.