Top Track 100

This is a list of largest private companies in the United Kingdom according to sales. Under UK company law, a private company (with the suffix "Ltd" usually) may not offer its shares for sale to the public (as can a "plc"). While lists of public companies usually rank businesses according to their market capitalisation (the traded share price multiplied by the number of shares), lists of private companies must use another measure, such as the value and volume of sales during a year.

This is a list of private companies in the United Kingdom, some of which based on the Sunday Times "Top Track".

Former members of the largest 100 private companies in the UK could have ceased to remain on the list for three main reasons.

They may have converted into a public company (like those on the FTSE 100, listed with the ), or have seen a decline in sales, or at worst gone into an insolvency procedure, been sold, broken up, or liquidated.

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