LinkedIn, Groupon and Pandora Media all saw significant gains at their public debuts.

LinkedIn and Pandora are now also trading significantly below the levels their stocks reached during their public debuts earlier this year.

While buzzy tech companies like Millennial Media saw shares skyrocket following public debuts, others like Erickson Air-Crane have seen delayed pricing.

While buzzy tech companies like Millennial Media MM.N saw shares skyrocket following public debuts, others like Erickson Air-Crane EAC.O have seen delayed pricing.

Not all fast casual operators have been able to sustain the euphoria surrounding their public debuts, because of issues specific to their business.

Shares of both software security company Palo Alto Networks Inc and online travel company Kayak Software Co soared last week during their public debuts.