SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER

Pursuant to Rule 13a-16 or 15d-16

of the Securities Exchange Act of 1934

For the month of: November 2005

ADECCO SA

(Exact name of Registrant as specified in its charter)

Commission # 0-25004

Sägereistrasse 10

CH-8152 Glattbrugg

Switzerland

+41 1 878 88 88

(Address of principal executive offices)

[Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or 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    

Attached:

- Disclosure of shareholdings – 4.94% Capital Group Companies

Disclosure of shareholdings

Adecco S.A. Chéserex - Pursuant to art. 20 of the Federal Act on Stock Exchanges and Securities Trading, Adecco S.A. has received the following notification:

1. Name of the listed company

Adecco S.A.

2. Number and type of shares and proportion of voting rights (total holdings in percent)

9’258’434 Registered Shares; 4.94 percent

3. Identity of the involved parties

The Capital Group Companies, Inc. (“CGC”), on behalf of funds managed by Capital Research and Management Company (“CRMC”), and clients managed by Capital Guardian Trust Company (“CGTC”), Capital International Limited (“CIL”), Capital International Inc. (“CII”), and Capital International S.A. (“CISA”).

Office Address:

CGC: 333 South Hope Street, Los Angeles, CA, USA

CRMC: 333 South Hope Street, Los Angeles, CA, USA

CGTC: 11100 Santa Monica Blvd 15th Fl., Los Angeles, CA, USA

CIL: 25 Bedford St., London, England

CII: 11100 Santa Monica Blvd 15th Fl., Los Angeles, CA, USA

CISA: 3 Place des Bergues, 1201 Geneva, Switzerland

4. Indirect sale, relationship between the beneficial owner and the direct vendor

CGC is a holding company for several subsidiary companies engaged in investment management business. The investment management business is divided into two operational groups, represented by CRMC and Capital Group International, Inc. (“CGII”). CRMC is an U.S.-based investment adviser that manages The American Funds Group of mutual funds. CGII is the parent company of five companies that serve as investment managers to various institutional clients around the globe: CGTC in the U.S., CII in the U.S. and Singapore, CIL in the United Kingdom, and CISA in Switzerland. CRMC and GGII are 100% affiliates of CGC. CGTC, CII, CIL and CISA are 100% affiliates of CGII. For a more complete description of our organization, please visit our Web site at www.capgroup.com.

Neither CGC nor any of its subsidiaries own shares of this company for their own account. Neither CGC nor any of its subsidiaries are beneficial owners of the shares. The shares reported in this Notification are owned by accounts under the discretionary investment management of one or more of the investment management companies described above. Furthermore, CRMC and CGII act separately from one another and from CGC in exercising investment discretion over their managed accounts. The discretionary investment management entitles CGS’s management companies to exercise voting rights autonomously and this Notification is therefore an “Independent Notification according to the Disclosure Office Notice Nr. II/99”.

Adecco S.A. 3 November 2005

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Disclosure of shareholdings

Contact:

Investor Relations:

Tel: +41 44 878 8925

E-Mail: investor.relations@adecco.com

About Adecco

Adecco S.A. is a Fortune Global 500 company and the global leader in HR services. The Adecco Group network connects up to 700,000 associates with business clients each day through its network of 32,000 employees and over 6,500 offices in 70 countries and territories around the world. Registered in Switzerland, and managed by a multinational team with expertise in markets spanning the globe, the Adecco Group delivers an unparalleled range of flexible staffing and career resources to corporate clients and qualified associates.

The Adecco Group comprises three Divisions: Adecco Staffing, Ajilon Professional and LHH Career Services. In Adecco Staffing, the Adecco network focuses on flexible staffing solutions for global industries in transition, including automotive, banking, electronics, logistics and telecommunications; Ajilon Professional offers an unrivalled range of specialised branded businesses; LHH Career Services encompasses our portfolio of outplacement and coaching consultancy businesses.

Adecco S.A. is registered in Switzerland (ISIN: CH0012138605) and listed on the Swiss Stock Exchange with trading on Virt-x (SWX/VIRT-X: ADEN), the New York Stock Exchange (NYSE: ADO) and Euronext Paris - Premier Marché (EURONEXT: ADE)

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SIGNATURES

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.

	ADECCO SA
	(Registrant)
Dated: 4 November 2005	By:	/s/ Jim Fredholm
		Jim Fredholm
		Chief Financial Officer
Dated: 4 November 2005	By:	/s/ Hans R. Brütsch
		Hans R. Brütsch
		Corporate Secretary