Contax Holding 6-K Notice to the Market

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER PURSUANT TO
RULE 13a-16 OR 15d-16 OF THESECURITIES
EXCHANGE ACT OF 1934

For the month of May, 2011

Commission

File Number 000-5149

CONTAX PARTICIPAÇÕES S.A.

(Exact name of Registrant as specified in its Charter)

Contax Holding Company

(Translation of Registrant's name in English)

Rua do Passeio, 56 – 16th floor
Rio de Janeiro, RJ
Federative Republic of Brazil

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file
annual reports under cover Form 20-F or Form 40-F.

Form 20-Fþ   Form 40-Fo

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.

Yeso    Noþ

CONTAX PARTICIPAÇÕES S.A.

Corporate Taxpayer ID.(CNPJ/MF): 04.032.433/0001-80

Company Registry (NIRE): 33300275410

Publicly Held Company

NOTICE TO THE MARKET

Rio de Janeiro, May 18, 2011 – Contax Participações S.A. (Bovespa: CTAX3, CTAX4 and OTC: CTXNY) hereby announces to its shareholders and the market in general that, on this date, all the shares issued by Stratton Spain S.L., Allus Spain S.L., Stratton Argentina S.A., Stratton Peru S.A. and Multienlace S.A., (which jointly make up the “Allus Group”) were transferred to its subsidiaries Contax S.A. and Contax Colombia SAS, pursuant to the stock purchase agreements entered into on April 5, 2011, as per the Material Fact published on the same date.

Rio de Janeiro, May 18, 2011.

Marco Norci Schroeder

Chief Financial and Investor Relations Officer

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.

Date: May 19, 2011

CONTAX PARTICIPAÇÕES S.A.
By:	/S/ Michel Neves Sarkis
	Name:   Michel Neves Sarkis Title:     Investor Relations Officer

FORWARD-LOOKING STATEMENTS

This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates of future economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations.