Check out which companies are making headlines before the bell on Friday:
Goldman Sachs - CNBC's Kayla Tausche reports that Goldman will be the lead underwriter for Twitter's initial public offering. The social networking site announced it had filed a confidential S-1 with the SEC, the first step towards an eventual IPO.
Ulta Salon Cosmetics - Ulta earned 70 cents per share for its second quarter, three cents above estimates, with revenue also coming in above forecasts. The personal care products maker also saw same-store sales improve more than analysts had thought.
General Electric - The manufacturing conglomerate is close to finalizing a nearly $2 billion contract to provide power turbines for six power plants, according to Dow Jones.