 Shares of real estate services companies rallied Thursday, after data showing that existing-home sales fell again in September, but managed to beat expectations. Zillow Group Inc.s stock Z, 2.65 ZG, 2.74 surged 1.9 in morning trading, reversing an earlier decline of as much as 0.8, while Redfin Corp. shares RDFN, 5.30 jumped 4.6 after being down 0.3 at its intraday low. 