Form 425 Fibria Celulose S.A. Filed by: Fibria Celulose S.A.

In connection with the proposed merger transaction by Suzano Pepel e Celulose S.A., Fibria Celulose S.A. filed the below press release.

FIBRIA CELULOSE S.A.

Publicly-Held Company

Corporate Taxpayer ID CNPJ/MF No. 60.643.228/0001-21

Company Registry (NIRE) 35.300.022.807 | CVM Code No. 12793

NOTICE TO THE MARKET

FIBRIA CELULOSE S.A. (“Company”) (B3: FIBR3 | NYSE: FBR), in the context of the Voting Agreement and other Obligations executed on March 15, 2018 by and among Votorantim S.A. (“Votorantim”), BNDES Participações S.A. — BNDESPAR (“BNDESPAR”), Suzano Holding S.A. and the other controlling shareholders of Suzano Papel e Celulose S.A. (“Suzano”) (“Voting Commitment”), discussed in the Material Fact published by the Company on March 16, 2018, hereby informs its shareholders and the market in general that the Company was informed by Votorantim and Suzano that, on May 31, 2018, the United States Federal Trade Commission granted early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, and thus for purposes of the US antitrust laws the transaction contemplated in the Voting Commitment can be implemented.

The closing of the aforementioned transaction is still subject to the fulfillment of other conditions precedent usual for this type of transaction, including the approval by certain antitrust authorities in Brazil and abroad. Until the date of the implementation of the transaction, the Company will continue to carry out its activities in the ordinary course of business and will remain operating independently.

The Company affirms, by means of the release of the information in this Notice to the Market, its commitment with transparency before its shareholders and investors.

São Paulo, June 1, 2018

Guilherme Perboyre Cavalcanti

Chief Financial and Investor Relations Officer

No Offer or Solicitation

This communication shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of the U.S. Securities Act of 1933, as amended, or an exemption therefrom.

Additional Information and Where to Find It

In connection with the proposed transaction between Fibria Celulose S.A. (the “Company”) and Suzano Papel e Celulose S.A. (“Suzano”) (the “Proposed Transaction”), the Company and Suzano may file relevant materials with the United States Securities and Exchange Commission (the “SEC”) including, in the case of a registered offering in the United States, a registration statement of Suzano on Form F-4 (unless an exemption therefrom is available). The Form F-4 (if and when filed) will contain a prospectus and other documents.  INVESTORS AND SECURITY HOLDERS OF THE COMPANY ARE URGED TO READ THE FORM F-4 AND OTHER DOCUMENTS THAT MAY BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE COMPANY, SUZANO AND THE PROPOSED TRANSACTION AND RELATED MATTERS. The Form F-4 (if and when filed) and all other documents filed with the U.S. SEC in connection with the Proposed Transaction will be available when filed, free of charge, on the U.S. SEC’s website at www.sec.gov. In addition, the Form F-4 (when filed) all other documents filed with the U.S. SEC in connection with the Proposed Transaction will be made available, free of charge, to U.S. shareholders of the Company on the Company’s website at http://www.fibria.com.br.

FORWARD LOOKING STATEMENTS

This communication contains certain statements that are “forward-looking” statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934. Words such as “anticipate”, “believe”, “continue”, “could”, “estimate”, “expect”, “hope”, “intend”, “may”, “might”, “should”, “would”, “will”, “understand” and similar words are intended to identify forward looking statements.  These forward-looking statements include, but are not limited to, statements regarding the Proposed Transaction.  There are a number of risks and uncertainties that could cause actual results to differ materially from the forward-looking statements included in this communication.  For example, the expected timing and likelihood of completion of the Proposed Transaction, including the timing, receipt and terms and conditions of any required governmental and regulatory approvals of the Proposed Transaction that could reduce anticipated benefits or cause the parties to abandon the transaction, the ability to successfully integrate the businesses, the occurrence of any event, change or other circumstances that could give rise to the termination of the agreements relating to the Proposed Transaction, the risk that the parties may not

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be able to satisfy the conditions to the proposed transaction in a timely manner or at all, risks related to disruption of management time from ongoing business operations due to the proposed transaction, the risk that any announcements relating to the proposed transaction could have adverse effects on the market price of the shares of the Company or Suzano, the risk that the Proposed Transaction and its announcement could have an adverse effect on the ability of the Company and Suzano to retain customers and retain and hire key personnel and maintain relationships with their suppliers and customers and on their operating results and businesses generally, the risk that problems may arise in successfully integrating the businesses of the companies, which may result in the combined company not operating as effectively and efficiently as expected, the risk that the combined company may be unable to achieve cost-cutting synergies or it may take longer than expected to achieve those synergies, and other factors.  All such factors are difficult to predict and are beyond the Company’s control, including those detailed in the Company’s annual reports on Form 20-F and current reports on Form 6-K that are available on its website at http://www.fibria.com.br and on the SEC’s website at http://www.sec.gov.  The Company’s forward-looking statements are based on assumptions that the Company believes to be reasonable but that may not prove to be accurate.  The Company undertakes no obligation to publicly release the result of any revisions to any such forward-looking statements that may be made to reflect events or circumstances that occur, or which we become aware of, except as required by applicable law or regulation. Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date hereof.

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