Announcement to the Market - Trading of Own Shares as Treasury Stock - Month: December 2017

CNPJ 61.532.644/0001-15 A Publicly Listed Company

Announcement to the Market

Trading of Own Shares as Treasury Stock

Pursuant to the best practices of Corporate Governance, ITAÚSA - INVESTIMENTOS ITAÚ S.A., announces to the entities of the capital markets:

Trading of Own Shares for Treasury Stock

• 1. in December 2017, ITAÚSA did not trade any of its own shares for treasury stock;

• 2. in the fiscal year 2017, ITAÚSA repurchased a total of 50,970,229 common shares of its own issue at the average price of R$ 8.80, which were canceled upon resolution of the Board of Directors at its meeting of August 7, 2017.

Trading by a Controlled Company of its Own Shares

• 3. in December 2017, the controlled company ITAÚ UNIBANCO HOLDING S.A. acquired 46,214,237 common shares of its own issue for treasury stock, at the average price of R$ 37.00; still in December, ITAÚ UNIBANCO HOLDING replaced to the market 1,752,534 preferred shares under the stock option grant plan and/or the share grant plan, approved by the General Shareholders Meeting;

• 4. as a consequence of this resale to the market, the direct and indirect stake of ITAÚSA in the capital stock of ITAÚ UNIBANCO HOLDING increased from 37.38% to 37.64%.

We would remind readers that historical data for ITAÚSA is available in the Company's Investor Relations sitewww.itausa.com.br.

São Paulo (SP), January 3, 2018.

ITAÚSA - INVESTIMENTOS ITAÚ S.A.

ALFREDO EGYDIO SETUBAL

Investor Relations Officer