A gain in July same store sales lifted the markets during the midday with the Dow gaining 36 points to 15,507. Nasdaq rose 18 points to 3672.

On the upside

Shares of Fox Factory Holding (Nasdaq: FOXF) surged in its market debut.

Intrexon (NYSE: XON) stock leaped on its first trading day. 

Second quarter earnings fell for Orbitz Worldwide (NYSE: OWW) but the results were better than expected and the online travel site lifted its 2013 revenue guidance.

On the downside

Fusion-io (NYSE: FIO) widened fourth quarter losses and forecast current quarter revenue well below analyst expectations.

Silicon Graphics (Nasdaq: SGI) narrowed fourth quarter losses but revenue fell and the company forecast first quarter results that missed expectations.

Intelliquent (Nasdaq: IQNT) reported higher preliminary second quarter earnings but the Audit Committee’s ongoing investigation into the forecasting practices of the Board of Directors prompted the company to delay its earnings call.  

In the broad market, advancing issues outpaced advancers by a margin of more than 2 to 1 on the NYSE and by more than 7 to 5 on Nasdaq. The broader S&P 500 gained 7 points to 1698.