The number of companies planning initial public offerings in London is still high, though some firms are deterred from floating their companies due to uncertain economic conditions, London Stock Exchange chief financial officer Doug Webb said Friday.

"The primary markets IPO area would benefit from more stable macroeconomic conditions than what we're seeing at the moment...What's interesting for me, though, is that both the number and quality of companies out there looking to come to the market remain at very high levels. So, the attractiveness of London as a listing and capital-raising venue remains as strong as ever," he told Dow Jones Newswires.