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 December, 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 today that Barclays PLC, had a notifiable interest as at 29 November 2006 in 438,557,151 ordinary shares of US$0.50 each in HSBC Holdings plc, representing approximately 3.79% 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 29 November 2006 Barclays PLC, through the legal entities listed on the attached schedule, has a notifiable interest in the capital of your Company of 3.79%. 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 11,571,374,287 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 29 November 2006 Barclays PLC, through the registered holders listed below, had a notifiable interest in 438,557,151 ORD USD0.50(UK REG) representing 3.79% of the issued share capital of 11,571,374,287 units. Registered Holder Account Designation Holding BANK OF IRELAND 426353 293,821 BANK OF IRELAND 426360 131,030 BANK OF NEW YORK 817,793 Barclays Bank PLC (Singapore) 12,953 Barclays Capital Nominees Ltd 18,000,000 Barclays Capital Nominees Ltd 11,200 Barclays Capital Nominees Ltd 6,162,132 Barclays Capital Nominees Ltd 18,171,205 Barclays Capital Nominees Ltd 15,116,035 Barclays Capital Nominees Ltd 36,296,710 Barclays Global Investors Canada 864,141 Barclays Trust Co & Others 16,851 BARCLAYS TRUST CO AS EXEC/ADM 30,825 Barclays Trust Co DMC69 32,604 Barclays Trust Co E99 3,990 Barclays Trust Co R69 189,380 BNP PARIBAS 476,723 CHASE NOMINEES LTD 16376 5,829,960 CHASE NOMINEES LTD 20947 37,317,717 CHASE NOMINEES LTD 28270 3,854,988 CHASE NOMINEES LTD 28270 649,339 CIBC MELLON GLOBAL SECURITIES 353,135 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 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 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 70314001 1,659 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 120142001 16,389 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 HGB0225 310594402 560 Clydesdale Nominees HGB0325 70309403 1,877 Clydesdale Nominees HGB0325 87093403 1,283 Clydesdale Nominees HGB0625 100376906 5,000 Durlacher Nominees Ltd 8,585,486 Gerrard Nominees Limited 602133 1,250 Gerrard Nominees Limited 602394 3,300 Gerrard Nominees Limited 603216 1,000 Gerrard Nominees Limited 603856 1,250 Gerrard Nominees Limited 607205 1,200 Gerrard Nominees Limited 608459 300 Gerrard Nominees Limited 610720 1,000 Gerrard Nominees Limited 615411 1,300 Gerrard Nominees Limited 620404 600 Gerrard Nominees Limited 622124 1,500 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 1,520 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) 1,335,739 Greig Middleton Nominees Ltd (GM3) 126066DA 4,140 Greig Middleton Nominees Ltd (GM3) 220805DN 208,683 Greig Middleton Nominees Ltd (GM3) 523475DN 220,000 INVESTORS BANK AND TRUST CO. 94,955 INVESTORS BANK AND TRUST CO. 1,074,545 INVESTORS BANK AND TRUST CO. 1,212,457 INVESTORS BANK AND TRUST CO. 627,933 INVESTORS BANK AND TRUST CO. 51,096,959 INVESTORS BANK AND TRUST CO. 2,509,107 INVESTORS BANK AND TRUST CO. 1,966,834 INVESTORS BANK AND TRUST CO. 18,974,111 INVESTORS BANK AND TRUST CO. 92,378 INVESTORS BANK AND TRUST CO. 2,863,586 INVESTORS BANK AND TRUST CO. 3,870,250 INVESTORS BANK AND TRUST CO. 7,750,865 INVESTORS BANK AND TRUST CO. 11,218,377 INVESTORS BANK AND TRUST CO. 61,549 INVESTORS BANK AND TRUST CO. 195,039 INVESTORS BANK AND TRUST CO. 785,232 INVESTORS BANK AND TRUST CO. 327,658 INVESTORS BANK AND TRUST CO. 1,196,832 INVESTORS BANK AND TRUST CO. 3,144,771 INVESTORS BANK AND TRUST CO. 3,576,030 INVESTORS BANK AND TRUST CO. 31,635,428 INVESTORS BANK AND TRUST CO. 501,354 JP MORGAN (BGI CUSTODY) 16331 2,823,595 JP MORGAN (BGI CUSTODY) 16331 499,337 JP MORGAN (BGI CUSTODY) 16338 668,366 JP MORGAN (BGI CUSTODY) 16341 6,264,143 JP MORGAN (BGI CUSTODY) 16341 1,510,909 JP MORGAN (BGI CUSTODY) 16342 1,510,891 JP MORGAN (BGI CUSTODY) 16344 524,674 JP MORGAN (BGI CUSTODY) 16345 879,828 JP MORGAN (BGI CUSTODY) 16400 70,485,317 JP MORGAN (BGI CUSTODY) 17011 196,902 JP MORGAN (BGI CUSTODY) 18408 911,024 JPMORGAN CHASE BANK 3,011,502 JPMORGAN CHASE BANK 990,665 JPMorgan Chase Bank 157,166 JPMorgan Chase Bank 588,999 JPMorgan Chase Bank 1,145,781 JPMorgan Chase Bank 1,566,577 JPMorgan Chase Bank 6,320,066 JPMorgan Chase Bank 11,714 JPMorgan Chase Bank 55,450 JPMorgan Chase Bank 310,227 JPMorgan Chase Bank 1,246,152 JPMorgan Chase Bank 95,329 JPMorgan Chase Bank 1,679,917 JPMorgan Chase Bank 58,973 JPMORGAN CHASE BANK 379,336 JPMorgan Chase Bank 80,097 JPMorgan Chase Bank 113,392 JPMorgan Chase Bank 653,237 JPMorgan Chase Bank 1,138,731 JPMorgan Chase Bank 65,525 Master Trust Bank 71,561 Master Trust Bank 49,572 Master Trust Bank 658,037 Mellon Trust - US CUSTODIAN / 409,813 Mellon Trust - US CUSTODIAN / 820,954 MELLON TRUST OF NEW ENGLAND 468,066 Mitsui Asset 201,404 NORTHERN TRUST BANK - BGI SEPA 1,235,723 NORTHERN TRUST BANK - BGI SEPA 965,812 R C Greig Nominees Limited 9,557,286 R C Greig Nominees Limited a/c AK1 2,985,383 R C Greig Nominees Limited a/c BL1 611,318 R C Greig Nominees Limited a/c BL1 RES 465 R C Greig Nominees Limited a/c CM1 299,064 R C Greig Nominees Limited GP1 854,348 R C Greig Nominees Limited SA1 479,177 Reflex Nominees Limited 6,413 Reflex Nominees Limited 7,977 STATE STREET BANK & TRUST - WI 897,801 STATE STREET BANK & TRUST - WI 376,119 STATE STREET BOSTON 880,081 STATE STREET BOSTON 5,412,696 STATE STREET TRUST OF CANADA - 836,171 The Northern Trust Company - U 587,540 Trust & Custody Services Bank 7,536 Trust & Custody Services Bank 48,373 Trust & Custody Services Bank 1,233,836 Trust & Custody Services Bank 105,379 ZEBAN NOMINEES LIMITED 1,971,460 ZEBAN NOMINEES LIMITED 53,292 Total 438,557,151 LEGAL ENTITY REPORT HSBC HLDGS SEDOL : 0540528 As at 29 November 2006 Barclays PLC, through the legal entities listed below, had a notifiable interest in 438,557,151 ORD USD0.50(UK REG) representing 3.79% of the issued share capital of 11,571,374,287 units Legal Entity Holding Percentage Held Barclays Global Investors Canada Ltd 864,141 0.0075 Barclays Capital Inc 18,000,000 0.1556 Barclays Private Bank and Trust Ltd 12,953 0.0001 Barclays Global Investors, N.A. 118,526,708 1.0244 Barclays Private Bank and Trust Ltd 524,742 0.0045 Barclays Private Bank and Trust Ltd 10,600 0.0001 Barclays Capital Securities Ltd 84,342,768 0.7290 Gerrard Ltd 16,778,103 0.1450 Barclays Private Bank and Trust Ltd 14,390 0.0001 Barclays Bank Trust Company Ltd 273,650 0.0024 Barclays Global Investors Australia Ltd 4,002,167 0.0346 Barclays Global Investors Ltd 114,968,869 0.9937 Barclays Global Fund Advisors 41,167,305 0.3558 Barclays Global Investors Japan Trust & Banking 13,236,351 0.1144 Barclays Global Investors Japan Ltd 4,426,680 0.0383 Barclays Life Assurance Co Ltd 19,382,972 0.1675 Barclays Private Bank Ltd 2,024,752 0.0175 Group Holding 438,557,151 3.7905 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: 06 December, 2006