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 29 August 2006 that Barclays PLC had a notifiable interest, as at 23 August 2006, in 420,891,667 ordinary shares of US$0.50 each in HSBC Holdings plc, representing approximately 3.65% 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 23 August 2006 Barclays PLC, through the legal entities listed on the attached schedule, has a notifiable interest in the capital of your Company of 3.65%. 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 11,524,059,418 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 23 August 2006 Barclays PLC, through the legal entities listed below, had a notifiable interest in 420,891,667 ORD USD0.50(UK REG) representing 3.65% of the issued share capital of 11,524,059,418 units Legal Entity Holding Percentage Held Barclays Global Investors Japan Trust & Banking 12,903,337 0.1120 Barclays Global Investors Ltd 121,040,100 1.0503 Barclays Bank Trust Company Ltd 240,387 0.0021 Barclays Global Investors, N.A. 117,844,209 1.0226 Barclays Global Fund Advisors 37,080,000 0.3218 Barclays Global Investors Canada Ltd 804,017 0.0070 Barclays Life Assurance Co Ltd 18,908,505 0.1641 Barclays Private Bank Ltd 2,216,927 0.0192 Gerrard Ltd 16,734,388 0.1452 Barclays Global Investors Australia Ltd 3,941,518 0.0342 Barclays Private Bank and Trust Ltd 10,600 0.0001 Barclays Private Bank and Trust Ltd 12,891 0.0001 Barclays Private Bank and Trust Ltd 14,379 0.0001 Barclays Capital Securities Ltd 70,314,840 0.6102 Barclays Global Investors Japan Ltd 4,400,480 0.0382 Barclays Capital Inc 13,871,633 0.1204 Barclays Private Bank and Trust Ltd 553,456 0.0048 Group Holding 420,891,667 3.6524 REGISTERED HOLDERS REPORT HSBC HLDGS SEDOL: 0540528 As at 23 August 2006 Barclays PLC, through the registered holders listed below, had a notifiable interest in 420,891,667 ORD USD0.50(UK REG) representing 3.65% of the issued share capital of 11,524,059,418 units. Registered Holder Account Holding Designation BANK OF IRELAND 426353 217,406 BANK OF IRELAND 426360 121,008 BANK OF NEW YORK 804,003 Barclays Bank PLC (Singapore) 12,891 BARCLAYS CAPITAL NOMINEES LIMITED 9,568,422 BARCLAYS CAPITAL NOMINEES LIMITED 59,476,808 BARCLAYS CAPITAL NOMINEES LIMITED 13,534,483 Barclays Capital Securities Ltd. 1,269,610 Barclays Capital Securities Ltd. 337,150 Barclays Global Investors Canada 804,017 Barclays Trust Co & Others 19,510 BARCLAYS TRUST CO AS EXEC/ADM C 000000000000000000 2,948 Barclays Trust Co DMC69 C 000000000000000000 32,400 Barclays Trust Co E99 C 000000000000000000 4,245 Barclays Trust Co R69 C 000000000000000000 181,284 BNP PARIBAS 463,068 CHASE NOMINEES LTD 16376 5,583,093 CHASE NOMINEES LTD 20947 40,394,033 CHASE NOMINEES LTD 28270 3,763,808 CHASE NOMINEES LTD 28270 685,144 CIBC MELLON GLOBAL SECURITIES 353,616 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 941 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 67355102 966 Clydesdale Nominees HGB0225 70160102 4,055 Clydesdale Nominees HGB0225 70383302 9,481 Clydesdale Nominees HGB0225 87093402 2,350 Clydesdale Nominees HGB0225 120147102 453 Clydesdale Nominees HGB0325 70309403 1,877 Clydesdale Nominees HGB0325 87093403 1,283 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 10,800 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) 1,317,166 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. 98,160 INVESTORS BANK AND TRUST CO. 1,934,249 INVESTORS BANK AND TRUST CO. 2,953,867 INVESTORS BANK AND TRUST CO. 77,015 INVESTORS BANK AND TRUST CO. 89,302 INVESTORS BANK AND TRUST CO. 1,048,649 INVESTORS BANK AND TRUST CO. 7,562,157 INVESTORS BANK AND TRUST CO. 2,584,545 INVESTORS BANK AND TRUST CO. 178,762 INVESTORS BANK AND TRUST CO. 11,594,740 INVESTORS BANK AND TRUST CO. 615,456 INVESTORS BANK AND TRUST CO. 17,705,553 INVESTORS BANK AND TRUST CO. 1,214,777 INVESTORS BANK AND TRUST CO. 54,953,459 INVESTORS BANK AND TRUST CO. 2,952,234 INVESTORS BANK AND TRUST CO. 725,040 INVESTORS BANK AND TRUST CO. 792,560 INVESTORS BANK AND TRUST CO. 321,774 INVESTORS BANK AND TRUST CO. 28,480,496 INVESTORS BANK AND TRUST CO. 337,456 INVESTORS BANK AND TRUST CO. 3,470,440 JP MORGAN (BGI CUSTODY) 16331 2,851,605 JP MORGAN (BGI CUSTODY) 16338 686,111 JP MORGAN (BGI CUSTODY) 16341 6,263,245 JP MORGAN (BGI CUSTODY) 16341 1,595,088 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 74,235,337 JP MORGAN (BGI CUSTODY) 17011 196,540 JP MORGAN (BGI CUSTODY) 18408 489,223 JPMORGAN CHASE BANK 371,523 JPMORGAN CHASE BANK 1,005,419 JPMORGAN CHASE BANK 2,936,099 JPMorgan Chase Bank 11,971 JPMorgan Chase Bank 6,174,305 JPMorgan Chase Bank 1,219,384 JPMorgan Chase Bank 1,533,332 JPMorgan Chase Bank 92,770 JPMorgan Chase Bank 1,110,586 JPMorgan Chase Bank 580,644 JPMorgan Chase Bank 105,763 JPMorgan Chase Bank 1,649,932 JPMorgan Chase Bank 58,973 JPMorgan Chase Bank 55,450 JPMorgan Chase Bank 310,227 JPMorgan Chase Bank 62,238 JPMorgan Chase Bank 111,652 JPMorgan Chase Bank 567,605 JPMorgan Chase Bank 65,525 JPMorgan Chase Bank 1,247,480 JPMorgan Chase Bank 80,097 JPMorgan Chase Bank 1,138,731 JPMorgan Chase Bank 694,404 Master Trust Bank 71,561 Mellon Trust - US CUSTODIAN / 801,476 Mellon Trust - US CUSTODIAN / 454,658 MELLON TRUST OF NEW ENGLAND 482,406 Mitsubishi Trust International 49,572 Mitsui Asset 189,747 NORTHERN TRUST BANK - BGI SEPA 258,810 NORTHERN TRUST BANK - BGI SEPA 1,001,363 NORTHERN TRUST BANK - BGI SEPA 1,203,738 R C Greig Nominees Limited 9,466,000 R C Greig Nominees Limited a/c AK1 3,021,354 R C Greig Nominees Limited a/c BL1 640,290 R C Greig Nominees Limited a/c BL1 RES 465 R C Greig Nominees Limited a/c CM1 293,515 R C Greig Nominees Limited GP1 876,422 R C Greig Nominees Limited SA1 463,323 Reflex Nominees Limited 7,977 Reflex Nominees Limited 6,402 STATE STREET BANK & TRUST - WI 912,141 STATE STREET BOSTON 861,101 STATE STREET BOSTON 5,861,768 STATE STREET TRUST OF CANADA - 813,958 The Northern Trust Company - U 575,181 Trust & Custody Services Bank 114,570 Trust & Custody Services Bank 7,298 UBS (Master) 14,708 ZEBAN NOMINEES LIMITED 2,216,927 Total 420,891,667 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: 30 August 2006