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 June 2015

Commission File Number: 001-15276

Itaú Unibanco Holding S.A.

(Exact name of registrant as specified in its charter)

Itaú Unibanco Holding S.A.

(Translation of Registrant’s Name into English)

Praça Alfredo Egydio de Souza Aranha, 100-Torre Itaúsa

04344-902 São Paulo, SP, Brazil

(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:  x      Form 40-F:   o

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Yes:   o      No:   x

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Yes:   o      No:   x

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

Yes:   o      No:   x

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

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.

	Itaú Unibanco Holding S.A.
		(Registrant)
Date:  June 2, 2015	By:	/s/ Marcelo Kopel
		Name:	Marcelo Kopel
		Title:	Investor Relations Officer

By:	/s/ Eduardo Mazzilli de Vassimon
	Name:	Eduardo Mazzilli de Vassimon
	Title:	Chief Financial Officer

 

EXHIBIT INDEX

99.1 Announcement to the Market - Trading of Own Shares for Treasury
Month:  May 2015

EX-99.1

Itaú Unibanco Holding S.A.

A Publicly Listed Company CNPJ. 60.872.504/0001-23

Announcement to the Market

Trading of Own Shares for Treasury

Month: May 2015

1. On November 18, 2004, in keeping with the best Corporate Governance practice, Itaú Unibanco Holding S.A. (“Itaú Unibanco”) voluntarily disclosed its “Operating Rules for the Trading of Own Shares for Treasury” (“Rules”).

2. Item 2.1.3 of the “Rules” established the obligation to make monthly disclosure of the volumes of own shares traded on stock exchanges by Itaú Unibanco, and minimum, average and maximum prices.

3. In this context, we wish to inform that during May 2015, Itaú Unibanco did not trade in its own shares for treasury stock.

4. We would point out that the share buy-back program, effective for December 16, 2014 until December 15, 2015, approved by the Board of Directors, authorizing the acquisition of up to 10.0 million of common shares and 50.0 million in preferred shares.

5. It should be kept in mind that in the approved share buy-back program, we had already acquired 17,596,600 preferred shares at the average price of R$ 34.26 as shown in the following table.

	Current Repurchase	Transaction	Trading	Prices – R$ per Share
	Program		Volume	Minimum	Average	Maximum
	Dec/14		1,000,000	34.13	34.75	35.07
	Jan/15		11,000,000	33.12	34.13	34.81
Preferred Shares	Feb/15	Purchase	3,596,600	33.89	34.68	35.05
	Mar/15		2,000,000	33.64	34.07	34.41
	Total		17,596,600	33.12	34.26	35.07

6. We would remind readers that historical data is available in the organization’s Investor Relations site (www.itau-unibanco.com/investor-relations).

São Paulo-SP, June 1st, 2015.

MARCELO KOPEL

Investor Relations Officer