The four US initial public offerings that made their debuts this week will provide encouragement to the growing backlog of companies in the IPO pipeline for the rest of the year by trading up from their issue price.

The confirmed backlog for US issuers shows 92 deals aiming to raise $9.8bn (€8.5bn), according to Dealogic, the investment banking research firm. There has been a significant increase since the first of August, when the backlog only stood at $3.3bn There were 24 IPO filings with the SEC in August, the highest number since October 2000.