By: Fiona Cincotta, Senior Market Analyst
As of February 2026, US tariff policy uncertainty is re-emerging as a material risk for UK financial markets. The FTSE 100 has climbed to record highs, yet trade negotiations with the United States are once again under scrutiny. The stability of the UK equity benchmark increasingly depends on whether existing trade arrangements remain intact. Market participants are weighing whether a renewed tariff regime could disrupt capital flows and corporate earnings expectations.
Fiona Cincotta, Senior Market Analyst at FOREX.com, analyses cross-asset market dynamics with a focus on currency and equity correlations. Her experience tracking sterling, global equity flows, and sector rotation provides a distinct lens on how US trade policy shifts can ripple through UK markets, particularly when domestic political uncertainty is already pressuring the British pound.
U.S. tariff policy is directly influencing UK market sentiment as investors reassess trade exposure. Fiona Cincotta notes that "attention's going to remain very much on tariffs and whether the UK will be able to keep its previously agreed trade deal with the U.S.", underscoring the fragility of current arrangements. Specifically, the risk that the United Kingdom may be forced to adopt "Trump's new global 10% tariff, or even a possible 15% tariffs, which obviously would be harder hitting" introduces a measurable downside scenario. Consequently, equity valuations and sterling stability increasingly hinge on policy clarity rather than purely domestic fundamentals.
The FTSE 100 continues to trade above 10,800, reflecting resilience despite geopolitical trade risk. Cincotta cautions that "the UK index trades above that 10,800 level. It's overbought though. So it is reason just to be cautious. We may see some consolidation", highlighting technical vulnerability. While the FTSE 100 benefits from international revenue exposure and sector rotation into banks, energy, and commodity stocks, U.S. tariff escalation could compress margins for globally active constituents. As a result, the apparent stability of UK equities may prove sensitive to even incremental shifts in U.S. trade policy enforcement.
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--- Written by Lindo Xulu, StoneX TV Journalist
--- Expert: Fiona Cincotta, StoneX Senior Market Analyst
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