AMDOCS LIMITED NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS — (Continued) (dollar and share amounts in thousands, except per share data) Sales to Significant Customers Note 22 — Selected Quarterly Results of Operations (Unaudited) The following table summarizes the percentage of sales to significant customer groups (when they amount to at least 10 percent of total revenue for the year). Year Ended September 30, 2013 2012 2011 Customer 1 .................................................... 28% 26% 29% Customer 2 .................................................... * 10 11 Customer 3 .................................................... * * 10 * Represents an amount of less than 10%. The following are details of the unaudited quarterly results of operations for the three months ended: Note 23 — Subsequent Event On November 5, 2013, the Company entered into a definitive agreement to acquire substantially all the assets of Celcite Management Solutions LLC (“Celcite”), for approximately $129,000 in cash, subject to customary closing conditions. Additional consideration may be paid later based on the achievement of agreed performance metrics. Celcite is a leading provider of network management solutions. The transaction is expected to close towards the end of the first quarter of fiscal 2014, or in the beginning of the second quarter of fiscal 2014. F-35 September 30, June 30, March 31, December 31, 2013 Revenue .......................... $845,225 $841,332 $832,938 $826,359 Operating income .................. 122,876 123,164 122,855 112,657 Net income ....................... 88,954 119,558 104,912 99,015 Basic earnings per share ............. 0.55 0.74 0.65 0.61 Diluted earnings per share ............ 0.54 0.73 0.64 0.61 2012 Revenue .......................... $822,128 $808,837 $808,928 $807,010 Operating income .................. 113,501 110,051 109,872 109,048 Net income ....................... 98,021 98,749 101,870 92,731 Basic earnings per share ............. 0.60 0.59 0.60 0.54 Diluted earnings per share ............ 0.60 0.59 0.60 0.53