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 May, 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 received notification on 17 May 2006 that Barclays PLC, had a notifiable interest as at 11 May 2006 in 498,482,753 ordinary shares of US$0.50 each in HSBC Holdings plc, representing approximately 4.35% 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, Barclays Corporate Secretariat, Barclays PLC "Dear Sir Companies Act 1985 ("The Act") - Part VI I hereby inform you that as at 11 May 2006 Barclays PLC, through the legal entities listed on the attached schedule, has a notifiable interest in the capital of your Company of 4.35%. 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 11,470,013,348 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 May 2006 Barclays PLC, through the legal entities listed below, had a notifiable interest in 498,482,753 ORD USD0.50(UK REG) representing 4.35% of the issued share capital of 11,470,013,348 units Legal Entity Holding Percentage Held Barclays Private Bank and Trust Ltd 628,824 0.0055 Barclays Private Bank and Trust Ltd 15,918 0.0001 Barclays Global Investors, N.A. 126,326,140 1.1014 Barclays Capital Inc 24,501,412 0.2136 Barclays Private Bank and Trust Ltd 10,600 0.0001 Barclays Global Investors Japan Trust & Banking 13,027,510 0.1136 Barclays Life Assurance Co Ltd 19,489,876 0.1699 Barclays Capital Securities Ltd 110,590,653 0.9642 Barclays Global Investors Canada Ltd 809,309 0.0071 Barclays Private Bank and Trust Ltd 6,564 0.0001 Barclays Global Investors Australia Ltd 4,388,811 0.0383 Barclays Global Investors Japan Ltd 4,973,188 0.0434 Barclays Private Bank Ltd 2,277,194 0.0199 Barclays Global Fund Advisors 34,671,393 0.3023 Barclays Global Investors Ltd 139,577,514 1.2169 Gerrard Ltd 16,925,498 0.1476 Barclays Bank Trust Company Ltd 262,349 0.0023 Group Holding 498,482,753 4.3463 REGISTERED HOLDERS REPORT HSBC HLDGS SEDOL: 0540528 As at 11 May 2006 Barclays PLC, through the registered holders listed below, had a notifiable interest in 498,482,753 ORD USD0.50(UK REG) representing 4.35% of the issued share capital of 11,470,013,348 units. Registered Holder Account Designation Holding BANK OF IRELAND 426353 176,919 BANK OF IRELAND 426360 100,898 BANK OF NEW YORK 802,541 Barclays Bank PLC (Singapore) 6,564 BARCLAYS CAPITAL NOMINEES LIMITED 102,951,107 BARCLAYS CAPITAL NOMINEES LIMITED 6,751,836 BARCLAYS CAPITAL NOMINEES LIMITED 24,060,017 Barclays Capital Securities Ltd. 887,710 Barclays Capital Securities Ltd. 441,395 Barclays Global Investors Canada 809,309 Barclays Trust Co & Others 19,492 BARCLAYS TRUST CO AS EXEC/ADM C 000000000000000000 6,073 Barclays Trust Co DMC69 C 000000000000000000 32,400 Barclays Trust Co E99 C 000000000000000000 15,258 Barclays Trust Co R69 C 000000000000000000 189,126 BNP PARIBAS 612,836 CHASE NOMINEES LTD 16376 5,580,478 CHASE NOMINEES LTD 20947 46,602,909 CHASE NOMINEES LTD 28270 3,595,924 CHASE NOMINEES LTD 28270 827,709 CIBC MELLON GLOBAL SECURITIES 407,432 Clydesdale Nominees HGB0125 3025101 5,600 Clydesdale Nominees HGB0125 32349601 7,589 Clydesdale Nominees HGB0125 32401801 2,078 Clydesdale Nominees HGB0125 32408501 3,700 Clydesdale Nominees HGB0125 32449201 21,638 Clydesdale Nominees HGB0125 49699401 7,500 Clydesdale Nominees HGB0125 52051801 11,719 Clydesdale Nominees HGB0125 59396501 3,141 Clydesdale Nominees HGB0125 59419801 1,237 Clydesdale Nominees HGB0125 59441401 14,665 Clydesdale Nominees HGB0125 59553401 4,769 Clydesdale Nominees HGB0125 59571201 2,186 Clydesdale Nominees HGB0125 59580101 3,859 Clydesdale Nominees HGB0125 59710301 2,105 Clydesdale Nominees HGB0125 59732401 7,045 Clydesdale Nominees HGB0125 59737501 6,478 Clydesdale Nominees HGB0125 59738301 8,192 Clydesdale Nominees HGB0125 59744801 4,121 Clydesdale Nominees HGB0125 60741901 3,000 Clydesdale Nominees HGB0125 63919101 2,430 Clydesdale Nominees HGB0125 63921301 1,725 Clydesdale Nominees HGB0125 64544201 5,749 Clydesdale Nominees HGB0125 65136101 2,307 Clydesdale Nominees HGB0125 66860401 1,980 Clydesdale Nominees HGB0125 67940101 30,974 Clydesdale Nominees HGB0125 68640801 8,200 Clydesdale Nominees HGB0125 69108801 2,795 Clydesdale Nominees HGB0125 69238601 6,967 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 69402801 1,794 Clydesdale Nominees HGB0125 69447801 4,635 Clydesdale Nominees HGB0125 69451601 2,910 Clydesdale Nominees HGB0125 69720501 2,000 Clydesdale Nominees HGB0125 69721301 2,700 Clydesdale Nominees HGB0125 69732901 18,754 Clydesdale Nominees HGB0125 69738801 2,244 Clydesdale Nominees HGB0125 69751501 3,048 Clydesdale Nominees HGB0125 69766301 13,992 Clydesdale Nominees HGB0125 69771001 58,410 Clydesdale Nominees HGB0125 69772801 58,410 Clydesdale Nominees HGB0125 70295001 2,234 Clydesdale Nominees HGB0125 70314001 2,258 Clydesdale Nominees HGB0125 70331001 2,075 Clydesdale Nominees HGB0125 70335301 4,720 Clydesdale Nominees HGB0125 70339601 2,814 Clydesdale Nominees HGB0125 70387601 2,009 Clydesdale Nominees HGB0125 70388401 2,890 Clydesdale Nominees HGB0125 70391401 2,022 Clydesdale Nominees HGB0125 80750701 12,509 Clydesdale Nominees HGB0125 80766301 2,807 Clydesdale Nominees HGB0125 83011801 3,214 Clydesdale Nominees HGB0125 86680501 2,918 Clydesdale Nominees HGB0125 88608301 2,633 Clydesdale Nominees HGB0125 88736501 2,730 Clydesdale Nominees HGB0125 100146401 500 Clydesdale Nominees HGB0125 100246001 2,794 Clydesdale Nominees HGB0125 120010601 11,665 Clydesdale Nominees HGB0125 120142001 16,389 Clydesdale Nominees HGB0125 300000001 3,114 Clydesdale Nominees HGB0125 310007101 5,776 Clydesdale Nominees HGB0125 310042001 3,430 Clydesdale Nominees HGB0125 310092601 7,537 Clydesdale Nominees HGB0125 310128001 3,807 Clydesdale Nominees HGB0125 310186801 2,352 Clydesdale Nominees HGB0125 310205801 2,264 Clydesdale Nominees HGB0125 310231701 2,368 Clydesdale Nominees HGB0125 310246501 21,750 Clydesdale Nominees HGB0125 310254601 4,635 Clydesdale Nominees HGB0125 310255401 20,741 Clydesdale Nominees HGB0125 310266001 1,920 Clydesdale Nominees HGB0125 310311901 3,172 Clydesdale Nominees HGB0125 310589801 1,300 Clydesdale Nominees HGB0125 310590101 1,523 Clydesdale Nominees HGB0125 310594401 3,000 Clydesdale Nominees HGB0125 700009301 3,208 Clydesdale Nominees HGB0125 700066201 2,931 Clydesdale Nominees HGB0125 700069701 18,860 Clydesdale Nominees HGB0125 700083201 2,112 Clydesdale Nominees HGB0125 700106501 2,575 Clydesdale Nominees HGB0225 48401502 4,821 Clydesdale Nominees HGB0225 59579802 4,273 Clydesdale Nominees HGB0225 59727802 21,951 Clydesdale Nominees HGB0225 67355102 966 Clydesdale Nominees HGB0225 69396002 3,157 Clydesdale Nominees HGB0225 70160102 5,261 Clydesdale Nominees HGB0225 70383302 11,884 Clydesdale Nominees HGB0225 87093402 4,537 Clydesdale Nominees HGB0225 120147102 453 Clydesdale Nominees HGB0325 70309403 2,291 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 6,300 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 19,500 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 659481 800 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 9,000 Gerrard Nominees Limited 770101 21,590 Gerrard Nominees Limited 774160 1,400 Gerrard Nominees Limited 781271 7,000 Greig Middleton Nominees Limited (GM1) 1,255,093 Greig Middleton Nominees Ltd (GM3) 126066DA 3,100 Greig Middleton Nominees Ltd (GM3) 220805DN 255,000 Greig Middleton Nominees Ltd (GM3) 523475DN 220,000 INVESTORS BANK AND TRUST CO. 652,400 INVESTORS BANK AND TRUST CO. 3,499,314 INVESTORS BANK AND TRUST CO. 2,505,240 INVESTORS BANK AND TRUST CO. 27,690,480 INVESTORS BANK AND TRUST CO. 323,959 INVESTORS BANK AND TRUST CO. 1,282,294 INVESTORS BANK AND TRUST CO. 2,591,250 INVESTORS BANK AND TRUST CO. 315,448 INVESTORS BANK AND TRUST CO. 1,056,954 INVESTORS BANK AND TRUST CO. 57,322,916 INVESTORS BANK AND TRUST CO. 180,877 INVESTORS BANK AND TRUST CO. 8,437,451 INVESTORS BANK AND TRUST CO. 80,642 INVESTORS BANK AND TRUST CO. 105,376 INVESTORS BANK AND TRUST CO. 645,931 INVESTORS BANK AND TRUST CO. 1,988,343 INVESTORS BANK AND TRUST CO. 107,586 INVESTORS BANK AND TRUST CO. 3,162,222 INVESTORS BANK AND TRUST CO. 20,150,775 INVESTORS BANK AND TRUST CO. 657,165 INVESTORS BANK AND TRUST CO. 11,829,512 JP MORGAN (BGI CUSTODY) 16331 2,958,556 JP MORGAN (BGI CUSTODY) 16338 674,823 JP MORGAN (BGI CUSTODY) 16341 6,237,382 JP MORGAN (BGI CUSTODY) 16341 1,886,982 JP MORGAN (BGI CUSTODY) 16342 1,432,033 JP MORGAN (BGI CUSTODY) 16344 629,104 JP MORGAN (BGI CUSTODY) 16345 1,056,830 JP MORGAN (BGI CUSTODY) 16400 86,599,367 JP MORGAN (BGI CUSTODY) 17011 190,533 JP MORGAN (BGI CUSTODY) 18408 516,943 JPMorgan Chase Bank 15,226 JPMorgan Chase Bank 6,212,522 JPMorgan Chase Bank 1,226,515 JPMorgan Chase Bank 1,625,268 JPMorgan Chase Bank 582,596 JPMorgan Chase Bank 314,257 JPMorgan Chase Bank 64,258 JPMorgan Chase Bank 76,769 JPMorgan Chase Bank 1,540,059 JPMorgan Chase Bank 1,169,244 JPMorgan Chase Bank 93,207 JPMorgan Chase Bank 107,589 JPMORGAN CHASE BANK 3,340,107 JPMORGAN CHASE BANK 1,048,704 JPMorgan Chase Bank 115,286 JPMorgan Chase Bank 86,885 JPMorgan Chase Bank 1,442,649 JPMorgan Chase Bank 75,244 JPMorgan Chase Bank 684,142 JPMorgan Chase Bank 1,404,440 JPMORGAN CHASE BANK 366,508 JPMorgan Chase Bank 691,139 Master Trust Bank 89,564 Mellon Trust - US CUSTODIAN / 981,341 Mellon Trust - US CUSTODIAN / 839,088 MELLON TRUST OF NEW ENGLAND 977,720 Mitsubishi Trust International 56,941 Mitsui Asset 181,065 NORTHERN TRUST BANK - BGI SEPA 293,592 NORTHERN TRUST BANK - BGI SEPA 1,452,673 NORTHERN TRUST BANK - BGI SEPA 1,146,017 R C Greig Nominees Limited 9,672,116 R C Greig Nominees Limited a/c AK1 3,030,708 R C Greig Nominees Limited a/c BL1 631,100 R C Greig Nominees Limited a/c BL1 RES 465 R C Greig Nominees Limited a/c CM1 279,169 R C Greig Nominees Limited GP1 889,971 R C Greig Nominees Limited SA1 455,706 Reflex Nominees Limited 7,977 Reflex Nominees Limited 7,941 STATE STREET BANK & TRUST - WI 1,063,936 STATE STREET BOSTON 5,880,847 STATE STREET TRUST OF CANADA - 924,360 Sumitomo TB 28,115 The Northern Trust Company - U 662,507 Trust & Custody Services Bank 6,483 Trust & Custody Services Bank 111,235 ZEBAN NOMINEES LIMITED 2,277,194 Total 498,482,753 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: 19 May 2006