The summer 2008 edition of the company's Charity Performance Guide showed an increase in investment assets to £70.6bn from £63bn in the previous edition six months earlier. The amount given in grants also rose sharply in the same period, from £2bn to £2.6bn.
"These results largely reflect financial information from the period immediately before the credit crunch," said Brian Gielty, the report's publisher. "They show a third sector that was absolutely flying.
"We will have to look at future results to see what effect the different economic conditions have had. That will be much clearer in a year or 18 months."
The performance guide will be officially launched on 1 October in London.