6-K

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 December, 2006

CIBA SPECIALTY CHEMICALS HOLDING INC.

(Exact name of Registrant as specified in its charter)

Klybeckstrasse 141

4002 Basel

Switzerland

(Address of principal executive offices)

     (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 þ  Form 40-F o

     (Indicate by check mark whether by furnishing the information contained in this Form, the Registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2 (b) under the Securities Exchange Act of 1934.)

Yes o   No þ

     (If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2 (b))

CIBA SPECIALTY CHEMICALS HOLDING INC.

On December 7, 2006, Ciba Specialty Chemicals Holding Inc., a stock corporation organized under the laws of Switzerland, issued a Disclosure of Participations giving notice of Franklin Resources, Inc.'s shareholder participation in the company as of December 4, 2006. A copy of the Disclosure of Participations is attached as Exhibit 99.1 and incorporated by reference herein.

EXHIBIT LIST 

Exhibit	Description
99.1	Disclosure of Participations dated December 7, 2006

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.

			Ciba Specialty Chemicals Holding Inc.
			(Registrant)
Date	December 8, 2006	By	/s/ Daniel Petitpierre	/s/ Beat Saxer
			Daniel Petitpierre Head Corporate Law	Beat Saxer Head Taxes Switzerland

EX-99.1

Exhibit 99.1

Ciba Specialty Chemicals Inc.	Ciba Spezialitätenchemie AG	Ciba Spécialités Chimiques SA
Switzerland	Schweiz	Suisse

Page 1 of 1

December 7, 2006
Basel, Switzerland

Disclosure of Participations

According to article 20 of the Swiss Stock Exchange Act and articles 17 and 19 of the Stock Exchange Ordinance, Ciba Specialty Chemicals Holding Inc. is hereby giving notice of the following shareholder participation as of December 4, 2006:

Shareholder	No. registered shares	Shares in %
Franklin Resources, Inc., 500 E. Broward Boulevard, Fort Lauderdale, FL 33394, USA through its subsidiaries Templeton Investment Counsel, LLC, Franklin Advisers, Inc., Franklin Templeton Investments Corp. and Templeton Global Advisors Limited	6 953 456	10.07%

Ciba Specialty Chemicals (SWX: CIBN, NYSE: CSB) is a leading global company dedicated to producing high-value effects for its customers' products. We strive to be the partner of choice for our customers, offering them innovative products and one-stop expert service. We create effects that improve the quality of life – adding performance, protection, color and strength to plastics, paper, automobiles, buildings, home and personal care products and much more. Ciba Specialty Chemicals is active in more than 120 countries around the world and is committed to be a leader in its chosen markets. In 2005, the Company's continued operations generated sales of CHF 6.1 billion and invested over CHF 270 million in R&D.

For further information please contact:

Media:	Tel. +41 61 636 4444	Fax +41 61 636 3019
Investor Relations:	Tel. +41 61 636 5081	Fax +41 61 636 5111