Filed by Alcoa Inc.

Pursuant to Rule 425

under the Securities Act of 1933

Subject Company: Alcan Inc.

Commission File No:

001-03677

ALCOA TO OFFER TO ACQUIRE ALCAN

Companies
Ticker	NYSE: AA		NYSE: AL; TSX: AL
Description	Alcoa is the world’s leading producer of primary aluminum, fabricated aluminum, and alumina, and is active in all major aspects of the industry: technology, mining, refining, smelting, fabricating, and recycling. Aluminum and alumina represent approximately three-fourths of Alcoa’s revenues, and the price of aluminum influences the operating results of Alcoa. Nonaluminum products include precision castings, industrial fasteners, consumer products, food service and flexible packaging products, plastic closures and electrical distribution systems for cars and trucks. Alcoa’s products are used worldwide in aircraft, automobiles, commercial transportation, packaging, consumer products, building and construction, and industrial applications. Alcoa is a global company operating in 44 countries. www.Alcoa.com		In 1902, Alcan was synonymous with aluminum production. Today, it offers much more. Alcan has evolved into one of the globe’s leading suppliers of bauxite, alumina and aluminum, and a top-ranked provider of engineered and packaging materials, delivering increased productivity, competitiveness and profitability to customers. Alcan’s strength lies in the powerful synergy of its skilled people, its market-driven solutions, its advanced technology and its proven commitment to sustainable value creation. Alcan is a strategic operating company that is more attuned and responsive to market opportunities. Each of the four business groups — Bauxite and Alumina, Primary Metal, Engineered Products and Packaging — hold strong market positions in the Americas, Europe and Asia. www.Alcan.com
Employees	123,000		65,000
2006 Financial Highlights	Revenues: EBITDA: Net Income: Alumina Capacity: Aluminum Capacity:	US$30.4 billion US$5.6 billion US$2,248 million 15.6 million tonnes 4.4 million tonnes	Revenues: EBITDA: Net Income: Alumina Capacity: Aluminum Capacity:	US$23.6 billion US$3.9 billion US$1,786 million 5.9 million tonnes 3.4 million tonnes
Combined Company	Revenues: EBITDA: Employees: Alumina Capacity: Aluminum Capacity:	US$54.0 billion US$9.5 billion 188,000 21.5 million tonnes 7.8 million tones
Strategic Rationale	•    Creates the premier fully integrated aluminum company •    Enhanced cash flow and US$1 billion in annual synergies •    Significant scale to compete in a changing environment •    Optimized portfolio of upstream assets •    Enhanced capacity for growth •    Strong technology, operations and talent •    Shared values and commitment to sustainability

ALCOA TO OFFER TO ACQUIRE ALCAN

Commitment to Canada	Leadership	Dual headquarters in Montreal and New York •     Strategic management functions in each city Significant Canadian Board representation
	Operations	Stand-alone Alumina and Primary Metals business based in Montreal •     Would be the largest aluminum company in the world •     US$32.3 billion in total revenue •     Approx. 38,000 employees operating in 29 countries Headquarters of Global Growth group – decision-making centered in Québec
	R&D Center	Quebec becomes center of aluminum innovation •     Alcan AP50 carbon smelting technology at the Complexe Jonquiere •     Alcoa post carbon “inert anode” technology pilot deployment in Québec
Transaction Terms	Offer	US$58.60 per share in cash and 0.4108 shares of Alcoa common stock •     Total value of US$73.25 share (as of 5/4/07) •     80% cash / 20% stock
	Premium	32% premium to 30-day average closing price on NYSE 20% premium to Alcan’s NYSE closing price on 5/4/07
	Key Conditions	66 2/3% of Alcan shares tendered Customary government and regulatory approvals
	Financing	Fully committed bridge loan facility Committed to maintain investment grade status
	Listings	Additional listing planned for the Toronto Stock Exchange
	Timing	We are in contact with the regulatory authorities Targeting completion by year end 2007

WHERE TO FIND ADDITIONAL INFORMATION

In connection with the offer by Alcoa to purchase all of the issued and outstanding common shares of Alcan (the “Offer”), Alcoa will be filing with the Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4 (the “Registration Statement”), which contains a prospectus relating to the Offer (the “Prospectus”), and a tender offer statement on Schedule TO (the “Schedule TO”). This communication is not a substitute for the Prospectus, the Registration Statement and the Schedule TO that Alcoa will file with the SEC. ALCAN SHAREHOLDERS AND OTHER INTERESTED PARTIES ARE URGED TO READ THESE DOCUMENTS, ALL OTHER APPLICABLE DOCUMENTS (AND ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS), WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT ALCOA, ALCAN AND THE OFFER. Materials filed with SEC will be available electronically without charge at the SEC’s website, www.sec.gov. Materials filed with the Canadian securities regulatory authorities (“CSRA”) also will be available electronically without charge at www.sedar.com. Materials filed with the SEC or the CSRA may also be obtained without charge at Alcoa’s website, www.Alcoa.com, or by directing a request to Alcoa’s investor relations department at (212) 836-2674. In addition, Alcan shareholders may obtain free copies of such materials filed with the SEC or the CSRA by directing a written or oral request to the Information Agent for the Offer, MacKenzie Partners, Inc., toll-free at (800) 322-2885 (English) or (888) 405-1217 (French).

While the Offer is being made to all holders of Alcan Common Shares, this communication does not constitute an offer or a solicitation in any jurisdiction in which such offer or solicitation is unlawful. The Offer is not being made in, nor will deposits be accepted in, any jurisdiction in which the making or acceptance thereof would not be in compliance with the laws of such jurisdiction. However, Alcoa may, in its sole discretion, take such action as they may deem necessary to extend the Offer in any such jurisdiction.

FORWARD-LOOKING STATEMENTS

Certain statements and assumptions in this communication contain or are based on “forward-looking” information and involve risks and uncertainties. Forward-looking statements may be identified by their use of words like “anticipates,” “believes,” “estimates,” “expects,” “hopes,” “targets,” “should,” “will,” “will likely result,” “forecast,” “outlook,” “projects” or other words of similar meaning. Such forward-looking information includes, without limitation, the statements as to the impact of the proposed acquisition on revenues, costs and earnings. Such forward looking statements are subject to numerous assumptions, uncertainties and risks, many of which are outside of Alcoa’s control. Accordingly, actual results and developments are likely to differ, and may differ materially, from those expressed or implied by the forward-looking statements contained in this communication. These risks and uncertainties include Alcoa’s ability to successfully integrate the operations of Alcan; the outcome of contingencies including litigation, environmental remediation, divestitures of businesses, and anticipated costs of capital investments; general business and economic conditions; interest rates; the supply and demand for, deliveries of, and the prices and price volatility of primary aluminum, fabricated aluminum, and alumina produced by Alcoa and Alcan; the timing of the receipt of regulatory and governmental approvals necessary to complete the acquisition of Alcan and any undertakings agreed to in connection with the receipt of such regulatory and governmental approvals; the timing of receipt of regulatory and governmental approvals for Alcoa’s and Alcan’s development projects and other operations; the availability of financing to refinance indebtedness incurred in connection with the acquisition of Alcan on reasonable terms; the availability of financing for Alcoa’s and Alcan’s development projects on reasonable terms; Alcoa’s and Alcan’s respective costs of production and their respective production and productivity levels, as well as those of their competitors; energy costs; Alcoa’s and Alcan’s ability to secure adequate transportation for their respective products, to procure mining equipment and operating supplies in sufficient quantities and on a timely basis, and to attract and retain skilled staff; the impact of changes in foreign currency exchange rates on Alcoa’s and Alcan’s costs and results, particularly the Canadian dollar, Euro, and Australian dollar, may affect profitability as some important raw materials are purchased in other currencies, while products generally are sold in U.S. dollars; engineering and construction timetables and capital costs for Alcoa’s and Alcan’s development and expansion projects; market competition; tax benefits and tax rates; the outcome of negotiations with key customers; the resolution of environmental and other proceedings or disputes; and Alcoa’s and Alcan’s ongoing relations with their respective employees and with their respective business partners and joint venturers.

Additional risks, uncertainties and other factors affecting forward looking statements include, but are not limited to, the following:

• Alcoa is, and the combined company will be, subject to cyclical fluctuations in London Metal Exchange primary aluminum prices, economic and business conditions generally, and aluminum end-use markets;

• Alcoa’s operations consume, and the combined company’s operations will consume, substantial amounts of energy, and profitability may decline if energy costs rise or if energy supplies are interrupted;

• The profitability of Alcoa and/or the combined company could be adversely affected by increases in the cost of raw materials;

• Union disputes and other employee relations issues could adversely affect Alcoa’s and/or the combined company’s financial results;

• Alcoa and/or the combined company may not be able to successfully implement its growth strategy;

• Alcoa’s operations are, and the combined company’s operations will be, exposed to business and operational risks, changes in conditions and events beyond its control in the countries in which it operates;

• Alcoa is, and the combined company will be, exposed to fluctuations in foreign currency exchange rates and interest rates, as well as inflation and other economic factors in the countries in which it operates;

• Alcoa faces, and the combined company will face, significant price competition from other aluminum producers and end-use markets for Alcoa products that are highly competitive;

• Alcoa and/or the combined company could be adversely affected by changes in the business or financial condition of a significant customer or customers;

• Alcoa and/or the combined company may not be able to successfully implement its productivity and cost-reduction initiatives;

• Alcoa and/or the combined company may not be able to successfully develop and implement new technology initiatives;

• Alcoa is, and the combined company will be, subject to a broad range of environmental laws and regulations in the jurisdictions in which it operates and may be exposed to substantial costs and liabilities associated with such laws;

• Alcoa’s smelting operations are expected to be affected by various regulations concerning greenhouse gas emissions;

• Alcoa and the combined company may be exposed to significant legal proceedings, investigations or changes in law; and

• Unexpected events may increase Alcoa’s and/or the combined company’s cost of doing business or disrupt Alcoa’s and/or the combined company’s operations.

See also the risk factors disclosed in Alcoa’s Annual Report on Form 10-K for the fiscal year ended December 31, 2006. Readers are cautioned not to put undue reliance on forward-looking statements. Alcoa disclaims any intent or obligation to update these forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required by applicable law.