1861  
Wilh. Wilhelmsen was established by Morten Wilhelm Wilhelmsen. The first office was located in Tønsberg, Norway.

1865  
The first vessel, Mathilde, was acquired.

1887  
The first steamer, Talabot was acquired. The steamer was immediately profitable and the letter "T"  becomes synonymous with the naming tradition for Wilh. Wilhelmsen's vessels.

1900  
Wilh. Wilhelmsen controlled 22 steamships and 1 sail ship, and the fleet had grown to be the largest under Norwegian flag.

1911  
Wilh. Wilhelmsen entered into liner trade, which soon became its most important activity.

1913  
The first tanker was delivered and Wilh. Wilhelmsen soon operated a fleet of 10 vessels, which in 1919 was 90% of the total Norwegian tanker tonnage.

1917  
The office moved from Tønsberg to Christiania (Oslo).

1921  
The first diesel powered liner vessel was delivered.

1970s  
- The ro-ro concept was developed in the Australian trade jointly by the companies Transatlantic and East Asiatic, marketed as ScanAustral/ScanCarriers. 
- The maritime service company Barwil Agencies and the ship management company Barber International was established.

1970s and 1980s  
Wilh. Wilhelmsen was a large player in the offshore oil contracting industry.

1983  
The first pure car carrier joined the fleet.

1995  
Wilh. Wilhelmsen acquired the outstanding ownership interests in Norway America Line.

1999  
Wilh. Wilhelmsen establish into a joint venture with Wallenius Lines to form Wallenius Wilhelmsen Lines AS. The company was renamed Wallenius Wilhelmsen Logistics AS (WWL) in 2005.  After a restructuring, Wilh. Wilhelmsen’s US flag operations were incorporated in what is currently conducted by the ASL Group.

2002  
A joint venture company was established with Wallenius, Hyundai Motor Company (HMC) and Kia Motors Corporation (KMC) to form EUKOR.

2004  
- Wilh. Wilhelmsen acquires a shareholding in Glovis Ltd. (“Glovis”), currently consisting of 15% of the total issued shares.
- Barber International and Barwil Agencies were merged into Wilhelmsen Maritime Serices (WMS).

2005  
The Norwegian listed company Unitor group was acquired, and integrated into Wilhelmsen Maritime Services.

2008  
Wilhelmsen Maritime Services acquires the Callenberg Group. The company consolidates its market brands under one flag and renames its business areas:
Wilhelmsen Ships Service            (formerly Barwil and Unitor Ships Service),
Wilhelmsen Ship Management    (formerly Barber Ship Management),
Wilhelmsen Ships Equipment      (formerly Unitor Ships Equipment) 
Wilhelmsen Marine Engineering  (formerly Callenberg Group).

2010  
The WWI group (“former” WW ASA) was restructured. A newly incorporated company, Wilh. Wilhelmsen ASA, will continue the Wilh. Wilhelmsen group’s shipping and logistics activities.  Wilhelmsen Maritime Services AS continued under a new holding company, Wilh. Wilhelmsen Holding ASA, which is also the majority shareholder in Wilh. Wilhelmsen ASA.