More than 6,000 companies in the FTSE All-share index, combined, experienced a difference of £2bn to their profits and £1bn to their pay-outs after the new financial year began on 1 January, according to accounts published by the Companies House.
The revisions to the figures, which include accounting changes linked to the new National Living Wage, revealed the size of the UK's biggest companies, as well as the fact that the average firms recorded a £2.3bn profit.
But official figures showed a continued fall in the number of firms in which the majority of shareholders own at least a third of a company, with a total of 33,818 firms with such a stake.
This comes as the government continues to pursue plans for a binding shareholder register, with the Chancellor Philip Hammond announcing the plan in his Budget in March.
The figures also showed a continuation of the trend towards bigger companies.
The FTSE All-share index now boasts a total market value of £1.931 trillion, a rise of 27% on the same figure for the whole of 2016.
The number of the highest-priced companies in the index, meanwhile, climbed by more than a third to 761.
The rate of growth slowed to 24.4% after a rise of 29.4% in the 12 months to the end of the last financial year.
Last year's largest gainers in the index were Shell, which attracted £1.24bn of new wealth, while coal and power company, SSE, gained £656m.
But mining giants including Anglo-Dutch firm, Anglo American, saw their total shares plummet as the company's massive profits were eroded by rising costs.
In the year that ended on 31 December last year, Anglo American posted its biggest profit in more than four years but saw a similar £1bn fall in the number of companies to which it was linked.
Overall, the number of firms with non-UK-based operations dropped by 7.7%, with more than 200 fewer foreign companies listed on the main exchanges.
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