FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Private Issuer Pursuant to Rule 13a - 16 or 15d - 16 of the Securities Exchange Act of 1934 For the month of June, 2005 HSBC Holdings plc 42nd Floor, 8 Canada Square, London E14 5HQ, England (Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F). Form 20-F X Form 40-F ...... (Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934). Yes....... No X (If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- ..............) NOTIFICATION OF MAJOR INTERESTS IN SHARES Section 198 - Companies Act 1985 The Company was notified on 3 June 2005 that Barclays PLC, had a notifiable interest as at 31 May 2005 in 351,871,399 ordinary shares of US$0.50 each in HSBC Holdings plc, representing approximately 3.14% of the ordinary shares in issue. A copy of the letter of notification, including a list of the registered holders of the shares where known, is quoted below. N S Black Assistant Secretary HSBC Holdings plc Letter to HSBC Holdings plc from Geoff Smith, Manager, Secretarial Services, Group Corporate Secretariat, Barclays PLC "Dear Sir Companies Act 1985 ("The Act") - Part VI I hereby inform you that as at 31 May 2005 Barclays PLC, through the legal entities listed on the attached schedule, has a notifiable interest in the capital of your Company of 3.14%. Details of this interest, together with a breakdown between registered holders (as required by Section 202(3) of the Act), are enclosed. The issued capital of 11,219,186,628 is the latest figure available to us. If this is incorrect please let me know. If you have any questions arising from this letter, please contact me on 020 7116 2913. Yours faithfully Geoff Smith Enc." REGISTERED HOLDERS REPORT HSBC HLDGS SEDOL: 0540528 As at 31 May 2005 Barclays PLC, through the registered holders listed below, had a notifiable interest in 351,871,399 ORD USD0.50(UK REG) representing 3.14% of the issued share capital of 11,219,186,628 units. Registered Holder Holding Barclays Global Investors Ltd 158,246,613 Barclays Private Bank and Trust Ltd 569,689 Gerrard Ltd 2,254,446 Barclays Private Bank and Trust Ltd 8,600 Barclays Bank Trust Company Ltd 269,094 Barclays Life Assurance Co Ltd 14,807,017 Barclays Global Investors Japan Ltd 4,933,816 Barclays Capital Inc 6,495 Barclays Global Fund Advisors 25,657,779 Barclays Global Investors Japan Trust & Banking 13,860,667 Barclays Global Investors, N.A. 120,475,193 Barclays Capital Securities Ltd 4,040,753 Barclays Private Bank Ltd 3,005,457 Barclays Private Bank and Trust Ltd 20,450 Barclays Global Investors Australia Ltd 3,715,330 Group Holding 351,871,399 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. HSBC Holdings plc By: Name: P A Stafford Title: Assistant Group Secretary Date: 6 June, 2005