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 August, 2006 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 17 August 2006 that Barclays PLC, had a notifiable interest as at 11 August 2006 in 467,612,602 ordinary shares of US$0.50 each in HSBC Holdings plc, representing approximately 4.06% 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, Barclays Compliance, Barclays PLC "Dear Sir Companies Act 1985 ("The Act") - Part VI I hereby inform you that as at 11 August 2006 Barclays PLC, through the legal entities listed on the attached schedule, has a notifiable interest in the capital of your Company of 4.06%. 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 11,523,496,211 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." LEGAL ENTITY REPORT HSBC HLDGS SEDOL : 0540528 As at 11 August 2006 Barclays PLC, through the legal entities listed below, had a notifiable interest in 467,612,602 ORD USD0.50(UK REG) representing 4.06% of the issued share capital of 11,523,496,211 units. Legal Entity Holding Percentage Held Barclays Global Investors Canada Ltd 801,450 0.0070 Barclays Global Fund Advisors 36,805,170 0.3201 Barclays Global Investors, N.A. 120,872,570 1.0489 Barclays Global Investors Ltd 122,234,401 1.0607 Barclays Private Bank Ltd 2,246,879 0.0195 Barclays Bank Trust Company Ltd 239,377 0.0021 Barclays Private Bank and Trust Ltd 10,600 0.0001 Barclays Private Bank and Trust Ltd 14,291 0.0001 Barclays Global Investors Japan Trust & Banking 12,885,135 0.1121 Barclays Capital Securities Ltd 90,335,888 0.7857 Gerrard Ltd 16,769,608 0.1459 Barclays Private Bank and Trust Ltd 571,661 0.0050 Barclays Private Bank and Trust Ltd 15,929 0.0001 Barclays Life Assurance Co Ltd 18,861,699 0.1641 Barclays Global Investors Japan Ltd 4,453,193 0.0387 Barclays Capital Inc 36,554,310 0.3179 Barclays Global Investors Australia Ltd 3,940,441 0.0343 Group Holding 467,612,602 4.0623 REGISTERED HOLDERS REPORT HSBC HLDGS SEDOL: 0540528 As at 11 August 2006 Barclays PLC, through the registered holders listed below, had a notifiable interest in 467,612,602 ORD USD0.50(UK REG) representing 4.06% of the issued share capital of 11,523,496,211 units. Registered Holder Account Holding Designation BANK OF IRELAND 426353 194,660 BANK OF IRELAND 426360 115,985 BANK OF NEW YORK 801,446 Barclays Bank PLC (Singapore) 14,291 BARCLAYS CAPITAL NOMINEES LIMITED 35,947,000 BARCLAYS CAPITAL NOMINEES LIMITED 10,697,051 BARCLAYS CAPITAL NOMINEES LIMITED 78,470,237 Barclays Capital Securities Ltd. 525,310 Barclays Capital Securities Ltd. 82,000 Barclays Capital Securities Ltd. 1,168,600 Barclays Global Investors Canada 801,450 Barclays Trust Co & Others 19,492 BARCLAYS TRUST CO AS EXEC/ADM C 000000000000000000 2,948 Barclays Trust Co DMC69 C 000000000000000000 32,400 Barclays Trust Co E99 C 000000000000000000 7,829 Barclays Trust Co R69 C 000000000000000000 176,708 BNP PARIBAS 463,925 CHASE NOMINEES LTD 16376 5,583,093 CHASE NOMINEES LTD 20947 41,061,831 CHASE NOMINEES LTD 28270 685,144 CHASE NOMINEES LTD 28270 3,724,698 CIBC MELLON GLOBAL SECURITIES 351,903 Clydesdale Nominees HGB0125 3025101 5,600 Clydesdale Nominees HGB0125 32349601 6,207 Clydesdale Nominees HGB0125 32449201 16,545 Clydesdale Nominees HGB0125 52051801 11,719 Clydesdale Nominees HGB0125 59396501 2,187 Clydesdale Nominees HGB0125 59419801 1,237 Clydesdale Nominees HGB0125 59441401 11,551 Clydesdale Nominees HGB0125 59553401 3,845 Clydesdale Nominees HGB0125 59571201 1,646 Clydesdale Nominees HGB0125 59710301 1,573 Clydesdale Nominees HGB0125 59732401 5,246 Clydesdale Nominees HGB0125 59737501 5,081 Clydesdale Nominees HGB0125 59738301 6,662 Clydesdale Nominees HGB0125 59744801 3,246 Clydesdale Nominees HGB0125 60741901 3,000 Clydesdale Nominees HGB0125 63919101 2,430 Clydesdale Nominees HGB0125 63921301 1,725 Clydesdale Nominees HGB0125 64544201 4,709 Clydesdale Nominees HGB0125 65136101 1,772 Clydesdale Nominees HGB0125 66860401 1,428 Clydesdale Nominees HGB0125 67940101 24,471 Clydesdale Nominees HGB0125 68640801 8,200 Clydesdale Nominees HGB0125 69108801 2,795 Clydesdale Nominees HGB0125 69238601 6,099 Clydesdale Nominees HGB0125 69296301 9,300 Clydesdale Nominees HGB0125 69326901 7,000 Clydesdale Nominees HGB0125 69340401 3,000 Clydesdale Nominees HGB0125 69390001 3,191 Clydesdale Nominees HGB0125 69447801 57,635 Clydesdale Nominees HGB0125 69451601 2,910 Clydesdale Nominees HGB0125 69720501 2,000 Clydesdale Nominees HGB0125 69721301 2,700 Clydesdale Nominees HGB0125 69732901 16,517 Clydesdale Nominees HGB0125 69738801 1,341 Clydesdale Nominees HGB0125 69751501 3,048 Clydesdale Nominees HGB0125 69771001 58,410 Clydesdale Nominees HGB0125 69772801 58,410 Clydesdale Nominees HGB0125 69829501 2,867 Clydesdale Nominees HGB0125 69830901 10,500 Clydesdale Nominees HGB0125 70295001 1,804 Clydesdale Nominees HGB0125 70314001 1,659 Clydesdale Nominees HGB0125 70331001 2,075 Clydesdale Nominees HGB0125 70335301 3,370 Clydesdale Nominees HGB0125 70339601 2,290 Clydesdale Nominees HGB0125 70387601 1,631 Clydesdale Nominees HGB0125 70388401 2,400 Clydesdale Nominees HGB0125 70391401 1,427 Clydesdale Nominees HGB0125 80750701 10,509 Clydesdale Nominees HGB0125 80766301 2,145 Clydesdale Nominees HGB0125 83011801 2,587 Clydesdale Nominees HGB0125 86680501 2,432 Clydesdale Nominees HGB0125 88608301 1,946 Clydesdale Nominees HGB0125 100146401 500 Clydesdale Nominees HGB0125 120010601 11,665 Clydesdale Nominees HGB0125 120142001 16,389 Clydesdale Nominees HGB0125 120172201 4,543 Clydesdale Nominees HGB0125 300000001 2,195 Clydesdale Nominees HGB0125 310007101 4,422 Clydesdale Nominees HGB0125 310042001 2,720 Clydesdale Nominees HGB0125 310092601 6,333 Clydesdale Nominees HGB0125 310128001 2,987 Clydesdale Nominees HGB0125 310186801 1,901 Clydesdale Nominees HGB0125 310205801 1,564 Clydesdale Nominees HGB0125 310231701 1,776 Clydesdale Nominees HGB0125 310246501 23,859 Clydesdale Nominees HGB0125 310254601 3,724 Clydesdale Nominees HGB0125 310255401 20,741 Clydesdale Nominees HGB0125 310266001 1,258 Clydesdale Nominees HGB0125 310311901 2,308 Clydesdale Nominees HGB0125 310589801 1,300 Clydesdale Nominees HGB0125 310590101 1,158 Clydesdale Nominees HGB0125 310594401 2,043 Clydesdale Nominees HGB0125 700009301 2,320 Clydesdale Nominees HGB0125 700066201 2,031 Clydesdale Nominees HGB0125 700083201 1,512 Clydesdale Nominees HGB0125 700106501 2,026 Clydesdale Nominees HGB0225 59579802 3,534 Clydesdale Nominees HGB0225 59727802 15,928 Clydesdale Nominees HGB0225 67355102 966 Clydesdale Nominees HGB0225 70160102 4,055 Clydesdale Nominees HGB0225 70383302 9,481 Clydesdale Nominees HGB0225 87093402 3,477 Clydesdale Nominees HGB0225 120147102 453 Clydesdale Nominees HGB0325 70309403 1,877 Clydesdale Nominees HGB0325 87093403 2,137 Clydesdale Nominees HGB0625 100376906 5,000 Gerrard Nominees Limited 602133 1,250 Gerrard Nominees Limited 603216 1,000 Gerrard Nominees Limited 603856 1,250 Gerrard Nominees Limited 608459 300 Gerrard Nominees Limited 610720 1,000 Gerrard Nominees Limited 611717 6,500 Gerrard Nominees Limited 615411 1,000 Gerrard Nominees Limited 620404 600 Gerrard Nominees Limited 622124 1,500 Gerrard Nominees Limited 629038 350 Gerrard Nominees Limited 630871 1,000 Gerrard Nominees Limited 631118 17,200 Gerrard Nominees Limited 633484 1,200 Gerrard Nominees Limited 635860 1,800 Gerrard Nominees Limited 637739 600 Gerrard Nominees Limited 639311 2,000 Gerrard Nominees Limited 639353 900 Gerrard Nominees Limited 640824 7,900 Gerrard Nominees Limited 642367 5,500 Gerrard Nominees Limited 642686 600 Gerrard Nominees Limited 643975 4,500 Gerrard Nominees Limited 647291 2,300 Gerrard Nominees Limited 650668 4,000 Gerrard Nominees Limited 652198 14,000 Gerrard Nominees Limited 653035 3,300 Gerrard Nominees Limited 654151 2,000 Gerrard Nominees Limited 658574 2,500 Gerrard Nominees Limited 658729 1,400 Gerrard Nominees Limited 659442 1,750 Gerrard Nominees Limited 659792 1,370 Gerrard Nominees Limited 660137 1,640 Gerrard Nominees Limited 660302 3,500 Gerrard Nominees Limited 660318 48,000 Gerrard Nominees Limited 660430 1,040 Gerrard Nominees Limited 660632 2,100 Gerrard Nominees Limited 660758 16,500 Gerrard Nominees Limited 660851 14,000 Gerrard Nominees Limited 660968 9,630 Gerrard Nominees Limited 768557 10,300 Gerrard Nominees Limited 770101 21,590 Gerrard Nominees Limited 774160 1,400 Gerrard Nominees Limited 781271 7,000 Greig Middleton Nominees Limited (GM1) 1,315,466 Greig Middleton Nominees Ltd (GM3) 126066DA 3,100 Greig Middleton Nominees Ltd (GM3) 220805DN 208,683 Greig Middleton Nominees Ltd (GM3) 523475DN 220,000 INVESTORS BANK AND TRUST CO. 89,302 INVESTORS BANK AND TRUST CO. 113,619 INVESTORS BANK AND TRUST CO. 178,762 INVESTORS BANK AND TRUST CO. 1,930,662 INVESTORS BANK AND TRUST CO. 31,400 INVESTORS BANK AND TRUST CO. 2,584,545 INVESTORS BANK AND TRUST CO. 613,332 INVESTORS BANK AND TRUST CO. 1,214,777 INVESTORS BANK AND TRUST CO. 1,048,649 INVESTORS BANK AND TRUST CO. 77,015 INVESTORS BANK AND TRUST CO. 99,142 INVESTORS BANK AND TRUST CO. 58,088,324 INVESTORS BANK AND TRUST CO. 7,537,180 INVESTORS BANK AND TRUST CO. 17,709,704 INVESTORS BANK AND TRUST CO. 11,388,418 INVESTORS BANK AND TRUST CO. 2,953,867 INVESTORS BANK AND TRUST CO. 2,839,882 INVESTORS BANK AND TRUST CO. 3,517,167 INVESTORS BANK AND TRUST CO. 719,872 INVESTORS BANK AND TRUST CO. 321,774 INVESTORS BANK AND TRUST CO. 28,291,131 INVESTORS BANK AND TRUST CO. 322,784 INVESTORS BANK AND TRUST CO. 792,560 JP MORGAN (BGI CUSTODY) 16331 2,883,154 JP MORGAN (BGI CUSTODY) 16338 686,111 JP MORGAN (BGI CUSTODY) 16341 1,595,088 JP MORGAN (BGI CUSTODY) 16341 6,224,000 JP MORGAN (BGI CUSTODY) 16342 1,457,169 JP MORGAN (BGI CUSTODY) 16344 527,399 JP MORGAN (BGI CUSTODY) 16345 882,396 JP MORGAN (BGI CUSTODY) 16400 74,790,856 JP MORGAN (BGI CUSTODY) 17011 196,540 JP MORGAN (BGI CUSTODY) 18408 487,976 JPMORGAN CHASE BANK 370,934 JPMorgan Chase Bank 11,971 JPMorgan Chase Bank 6,167,513 JPMorgan Chase Bank 1,644,157 JPMorgan Chase Bank 1,216,851 JPMorgan Chase Bank 92,770 JPMorgan Chase Bank 1,110,586 JPMorgan Chase Bank 580,644 JPMorgan Chase Bank 105,763 JPMorgan Chase Bank 1,530,230 JPMorgan Chase Bank 58,973 JPMorgan Chase Bank 55,450 JPMorgan Chase Bank 310,227 JPMorgan Chase Bank 80,097 JPMorgan Chase Bank 1,247,480 JPMorgan Chase Bank 1,138,731 JPMorgan Chase Bank 118,831 JPMorgan Chase Bank 692,045 JPMorgan Chase Bank 567,605 JPMorgan Chase Bank 111,652 JPMorgan Chase Bank 65,525 JPMORGAN CHASE BANK 2,943,141 JPMORGAN CHASE BANK 997,300 Master Trust Bank 71,561 Mellon Trust - US CUSTODIAN / 454,658 Mellon Trust - US CUSTODIAN / 802,002 MELLON TRUST OF NEW ENGLAND 484,057 Mitsubishi Trust International 49,572 Mitsui Asset 189,266 NORTHERN TRUST BANK - BGI SEPA 259,943 NORTHERN TRUST BANK - BGI SEPA 1,003,400 NORTHERN TRUST BANK - BGI SEPA 1,203,738 R C Greig Nominees Limited 9,503,649 R C Greig Nominees Limited a/c AK1 3,016,964 R C Greig Nominees Limited a/c BL1 636,074 R C Greig Nominees Limited a/c BL1 RES 465 R C Greig Nominees Limited a/c CM1 293,201 R C Greig Nominees Limited GP1 882,424 R C Greig Nominees Limited SA1 462,312 Reflex Nominees Limited 7,977 Reflex Nominees Limited 7,952 STATE STREET BANK & TRUST - WI 912,141 STATE STREET BOSTON 866,589 STATE STREET BOSTON 5,846,178 STATE STREET TRUST OF CANADA - 816,110 The Northern Trust Company - U 576,848 Trust & Custody Services Bank 6,741 Trust & Custody Services Bank 114,087 ZEBAN NOMINEES LIMITED 2,246,879 Total 467,612,602 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: 18 August 2006