================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* SINA CORPORATION (Name of Issuer) Common Shares (Title of Class of Securities) 2579230 (CUSIP Number) April 21, 2006 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [x] Rule 13d-1(c) [ ] Rule 13d-1(d) *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). ================================================================================ Page 1 of 6 Pages ----------------- ----------------- CUSIP No. 2579230 13G/A Page 2 of 6 Pages ----------------- ----------------- -------------------------------------------------------------------------------- 1. Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only). Michael J.G. Gleissner -------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) (b) -------------------------------------------------------------------------------- 3. SEC Use Only -------------------------------------------------------------------------------- 4. Citizenship or Place of Organization German -------------------------------------------------------------------------------- Number of 5. Sole Voting Power 0 Shares -------------------------------------------------------------- Beneficially 6. Shared Voting Power 0 Owned by -------------------------------------------------------------- Each Reporting 7. Sole Dispositive Power 0 Person With -------------------------------------------------------------- 8. Shared Dispositive Power 0 -------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 0 -------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) -------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 0 -------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) IN -------------------------------------------------------------------------------- Page 2 of 6 Pages ----------------- ----------------- CUSIP No. 2579230 13G/A Page 3 of 6 Pages ----------------- ----------------- Item 1. Name of Issuer: SINA CORPORATION (b) Address of Issuer's Principal Executive Offices: Room 1802, United Plaza 1468 Nan Jing Road West Shanghai 200040, China Item 2. (a) Name of Person Filing: Michael J.G. Gleissner. This Amendment to Schedule 13G is filed to reflect the fact that all 3,634,126 shares previously held by Michael J.G. Gleissner in Issuer have been transferred to Bigfoot Ventures Ltd., a company wholly owned by Michael J.G. Gleissner. Bigfoot Ventures Ltd. separately has filed a Schedule 13G reflecting its total of ownership of 4,750,000 shares of Issuer. (b) Address of Principal Business Office or, if none, Residence Room 1001, 10/F Chuk On Building 23 Mercer Street Sheung Wan, Hong Kong SAR (c) Citizenship: German (d) Title of Class of Securities: Common (e) CUSIP Number: 2579230 Page 3 of 6 Pages ----------------- ----------------- CUSIP No. 2579230 13G/A Page 4 of 6 Pages ----------------- ----------------- Item 3. If this statement is filed pursuant to ss.ss.240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: (a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o). (b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c). (c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c). (d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8). (e) [ ] An investment adviser in accordance with ss.240.13d-1(b)(1)(ii)(E); (f) [ ] An employee benefit plan or endowment fund in accordance with ss.240.13d-1(b)(1)(ii)(F); (g) [ ] A parent holding company or control person in accordance with ss.240.13d-1(b)(1)(ii)(G); (h) [ ] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3); (j) [ ] Group, in accordance with ss.240.13d-1(b)(1)(ii)(J). If this statement is filed pursuant to Rule 13d-1(c), check this box [X] Item 4. Ownership: Michael J.G. Gleissner (a) Amount beneficially owned: 0 (b) Percent of class: 0 Page 4 of 6 Pages ----------------- ----------------- CUSIP No. 2579230 13G/A Page 5 of 6 Pages ----------------- ----------------- (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 0 (ii) Shared power to vote or to direct the vote: 0. (iii) Sole power to dispose or to direct the disposition of: 0 (iv) Shared power to dispose or to direct the disposition of: 0. Item 5. Ownership of Five Percent or Less of a Class: Not Applicable If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [X]. Item 6. Ownership of More than Five Percent on Behalf of Another Person: Not Applicable Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company Not Applicable. Item 8. Identification and Classification of Members of the Group Not Applicable. Item 9. Notice of Dissolution of Group Not Applicable. Page 5 of 6 Pages ----------------- ----------------- CUSIP No. 2579230 13G/A Page 6 of 6 Pages ----------------- ----------------- Item 10. Certification By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated this 1st day of May 2006. /s/ Michael J.G. Gleissner ------------------------------- Michael J.G. Gleissner Page 6 of 6 Pages