297 6 Receivables 7 Other assets 8 Share capital In the years 2003 through 2010, 69,030,000 class B preferred shares were issued under these option rights. In March 2011,  Vereniging Aegon exercised its option rights to purchase in aggregate 41,042,000 class B preferred shares at par value. It did this to  correct dilution caused by Aegon’s issuance of shares conducted under Aegon’s US Shelf Registration, which comprised the sale of  173,604,912 common shares of Aegon N.V. at a price of EUR 5.20 per share in March 2011. In August 2012 and October 2012,  Vereniging Aegon exercised its option rights to purchase in aggregate 8,021,000 class B Preferred Shares at par value. It did this to  correct dilution caused by Aegon’s issuance of shares on June 15, 2012, being the final dividend 2011 in the form of stock dividend,  and its issuance of shares on September 15, 2012, being the interim dividend 2012 in the form of stock dividend. In July 2013,  Vereniging Aegon exercised its option rights to purchase in aggregate 12,691,745 common shares B at market value.  Vereniging Aegon, based in The Hague, the Netherlands, holds all of the issued common shares B. All issued common shares and common shares B each have a nominal value of EUR 0.12 and are fully paid up. Repayment of capital  can only be initiated by the Executive Board, is subject to approval of the Supervisory Board and must be resolved by the General  Meeting of Shareholders. Moreover, repayment on common shares B needs approval of the related shareholders. Refer to Other  information for further information on dividend rights. On February 15, 2013, Aegon N.V. and Vereniging Aegon entered into an agreement to simplify the capital structure of Aegon and to  cancel all of Aegon’s preferred shares, of which Vereniging Aegon was the sole owner. The execution of this agreement was subject to  the approval of the General Meeting of Shareholders of Aegon N.V. This approval was granted at the Annual General Meeting of  Shareholders on May 15, 2013. For details refer to the 'Major Shareholders' section. Aegon N.V., together with certain of its subsidiaries, is part of a tax grouping for Dutch corporate income tax purposes. The members of  the fiscal entity are jointly and severally liable for any taxes receivable or payable by the Dutch tax grouping. Other assets include derivatives with positive fair values of EUR 306 million (2012: EUR 330 million). Receivables from group companies and other receivables have a maturity of less than one year. Other receivables include an income tax  receivable of EUR 15 million (2012: EUR 59 million). Issued and outstanding 2013 2012 Common shares 256 236 Common shares B 69 - Preferred shares A - 53 Preferred shares B - 30 Total share capital 325 319 Authorized 2013 2012 Common shares 720 360 Common shares B 360 - Preferred shares A - 125 Preferred shares B - 125 At December 31 1,080 610 Par value in cents per share 2013 2012 Common shares 12 12 Common shares B 12 - Preferred shares A - 25 Preferred shares B - 25