CORPORATE EVENTS CALENDAR - 2011

Company Name

Trisul S.A.

Central Office Address

Avenida Paulista, 37 – 15 º andar – Jardim Paulista

CEP: 01311-902 – São Paulo

Avenida Paulista, 37 – 15 º andar – Jardim Paulista

CEP: 01311-902 – São Paulo

Website

www.trisul-sa.com.br/ir

Interim Investor Relations

Officer

Name: Marco Antonio Cattini Mattar

E-mail: ri@trisul-sa.com.br

Phone: (55 11) 3147.0011

Fax: (55 11) 3147.0104

Name: Marco Antonio Cattini Mattar

E-mail: ri@trisul-sa.com.br

Phone: (55 11) 3147.0011

Fax: (55 11) 3147.0104

Responsible for the

Investor Relations Area

Name: Priscilla Silva Castro

E-mail: priscillacastro@trisul-sa.com.br

Phone: (55 11) 3147.0134

Fax: (55 11) 3147.0104

Publications (and locality)

in which its corporate documents are published

Diário Oficial do Estado de São Paulo and O Estado de São Paulo.

The Company is complied with arbitration on Market Arbitration Chamber established by

Compulsory Clause registered in its By-Laws.

Annual Financial Statement and Consolidated Financial Statement, when applicable, as of

12/31/2010

EVENT

DATE

Accessible to Stockholders

03/29/2011

Submission to BM&FBOVESPA

03/29/2011

Publication

03/29/2011

Standardized Financial Statement (DFP), as of 12/31/2010

EVENT

DATE

Submission to BM&FBOVESPA

03/29/2011

Annual Financial Statement and Consolidated Financial Statement, when applicable, in English, as of 12/31/2010

EVENTO

DATA

Envio à BM&FBOVESPA

18/04/2011

Proceeds in cash for results from fiscal year ending on 12/31/2010

Proceeds

Event-Date

Amount (R$)

Value in R$/share

Payment Day

Proceeds

Event-Date

Amount (R$)

Common

Payment Day

Dividends

OSM – 04/29/2011

R$ 9,300,390.62

R$ 0.113698418

-

Reference Form – as of 12/31/2010

EVENT

DATE

Submission to BM&FBOVESPA

05/31/2011

Quarterly Financial Statements – ITR

EVENT

DATE

Submission to BM&FBOVESPA

Referring to 1st quarter

05/12/2011

Referring to 2nd quarter

08/10/2011

Referring to 3rd quarter

11/09/2011

1

Quarterly Financial Statements in English

EVENT

DATE

Submission to BM&FBOVESPA

Referring to 1st quarter

06/30/2011

Referring to 2nd quarter

08/26/2011

Referring to 3rd quarter

11/25/2011

Conference Call / Webcast (to discuss quarterly results)

EVENT

DATE

Earnings release conference call – the access information will be disclosed in the

Company’s Investor Relations website (www.trisul-sa.com.br/ir), as well as the timing.

Referring to 4Q10 Results

03/30/2011

Referring to 1Q11 Results

05/13/2011

Referring to 2Q11 Results

08/11/2011

Referring to 3Q11 Results

11/10/2011

Ordinary Shareholder’s Meeting

EVENT

DATE

Send Call Notice to BM&FBOVESPA, accompanied by the boards proposition, when any

04/13/2011

Publication of Call Notice

04/14/2011

04/15/2011

04/19/2011

Holding of Ordinary Shareholder’s Meeting

04/29/2011

Submission of the mains resolutions of the Ordinary Shareholders Meeting to

BM&FBOVESPA

04/29/2011

Submission of the minutes of the Ordinary Shareholders Meeting to BM&FBOVESPA

04/29/2011

Public Meeting with Analysts

EVENT

DATE

11/30/2011

2