Collapses — biggest profit reversals down
Profit was rising, then turned and fell — ranked by the depth of the drop across three filed years · 1,173 qualifying · snapshot 2026-10-01
All figures from each company's latest filed Companies House accounts; detailed filers only, with implausible outliers and scale artifacts excluded. Filed accounts lag the present by roughly 12–24 months, and group-vs-parent scope changes can move a figure between filings. Banks and insurers that don't report a turnover line are under-represented on the turnover-based boards.