He aggregate deficit of the 5,450 defined benefit pension schemes in the Pension Protection Fund 7800 Index fell by £37.5bn in April.
This meant the shortfall decreased from 43.9bn in March to £6.4bn at the end of the following month, largely due to a good performance in equity markets.
Meanwhile the funding ratio improved from 97.4 per cent at the end of March to 99.6 per cent in April.
At the end of April, the total assets in DB schemes were £1.65trn, while total liabilities were £1.66trn.
There were 3,089 schemes in deficit and 2,361 schemes in surplus, the PPF stated..