The accountancy group UHY Hacker Young calculated that 92 companies had delisted from Aim, London's junior stock market, in the past year, reducing the total number listed on Aim to 695.
Twenty-six companies have delisted from Aim since the general election in July, taking the total below 700 for the first time since 2001.
UHY Hacker Young said the possibility that the chancellor, Rachel Reeves, would scrap inheritance tax (IHT) relief on Aim shares was hurting the index, with only 10 companies floating on the market in the last year.
The value of the Aim market has fallen by 6% since Labour's election win on 4 July, while the blue-chip FTSE 100 index has been flat over the same period. Aim has fallen by more than 10% since Rishi Sunak called the election in May.
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