The stock immediately jumped its 10 percent daily limit to 10.04 riyals in unusually active trade.
Shares in Saudi fashion retailer Fawaz Abdulaziz Alhokair Co , whose major shareholder Fawaz Alhokair was also detained in the sweeping investigation and released at the weekend, jumped 7.6 percent in the opening minutes. The Saudi stock index <.tasi> was flat, restrained by a 1.9 percent drop by top petrochemical producer Saudi Basic Industries , which fell 2.1 percent after reporting lower-than-expected fourth-quarter earnings. (Reporting by Andrew Torchia)