Even as StubHub makes a renewed push to go public, its business isn't expanding as quickly as it had hoped. In the first half of this year, the ticketing app fell short of revenue and profit projections it shared with lenders earlier this year, in part due to new U.S. ticket pricing rules.

The shortfall highlights the volatile nature of the ticketing industry, which is heavily dependent on the flow of major concerts, something outside of StubHub's control. That issue could weigh on investors' minds as they contemplate StubHub's IPO, which is planned for mid-September, according to two people familiar with the matter.