1960-1969
Incorporated as Alcan Malayan Aluminium Company Limited on 18 July 1960 with equity participation by Alcan Aluminium Limited (Alcan) of Canada and Diethlem & Co. Ltd.

Two years later, Malaysia's first aluminium sheet rolling plant commenced operations at Petaling Jaya with an initial capacity of 2,000 tonnes per annum. The plant was officially inaugurated on 25 September 1963 by the first Prime Minister of Malaysia, Y.A.M. Tunku Abdul Rahman Putra Al-Haj, who signified the event as "one of my first engagements since the Federation came into being".

By 1968, capacity had tripled to 6000 tonnes per annum. 

On December 23, 1969, the company was listed on the Kuala Lumpur Stock Exchange following an issue of 2,950,000 shares (40 percent of equity) to the Malaysian Public. The company’s name changed to Alcan Malaysia Berhad (Alcanmalaysia).

1970-1979
In 1971, the company pioneered the country's first extrusion operations in Malaysia with an initial capacity of 3,000 tonnes per annum. 

In line with the New Economic Policy, Malaysian ownership was raised to 53% in 1975, including 35% for Bumiputras. The Company took on its present name, Aluminium Company of Malaysia Berhad (ALCOM). 

By the end of the decade, extrusion capacity had tripled to 9000 tonnes.

1980-1989
In 1980, the bold decision was taken to invest RM120 million in a new greenfield project in Bukit Raja. Capacity increased to 16,000 tonnes with two new continuous casters, a sheet mill and a foil mill. By 1983, ALCOM had pioneered foil production in Malaysia. The new 30-acre Bukit Raja plant together with the PJ Extrusion plant positioned ALCOM as the largest and most modern aluminium manufacturer in the ASEAN region.

In 1986, Alcan injected further capital into the company following heavy losses during the economic recession of the eighties. This took Alcan's equity up to a majority stake of 63.9%.

1990-1999
In 1992, Alcom Nikkei Specialty Coatings Sdn Bhd commenced operations. This 50:50 joint venture with Nippon Light Metal Co Ltd of Japan became the first plant outside of Japan to produce pre-coated finstock. In 1994, a third casting line was added taking sheet & foil capacity up to 24,000 tonnes. This was followed up in 1997 with a new state-of-the-art IHI foil mill and a second coating line for ANSC.

2000-Present
In 2000, ALCOM’s extrusion business was transferred to a wholly-owned subsidiary called Alcom Extrusion Sdn. Bhd. (AESB). The move was to enable AESB’s management to position itself for future expansion, strategic alliances and diversification. The Company implemented an Employee Share Option Scheme which became effective on 14 March 2000. 

Employees celebrated ALCOM’s 40th anniversary on July 18, 2000. 

In 2003, AESB was divested to enable greater focus on the sheet & foil business. This was in line with Alcan's global leadership in rolling. In January 2005, Alcan's rolling business was spun off as  Novelis Inc.

In 2006, ALCOM acquired the remaining 49% minority stake in ANSC making it a 100% subsidiary.