Originally a family business, established in 1833 on the banks of the Aker river in Oslo, Lilleborg expanded in 1842 to manufacturing hygiene products with the opening of "sæbesyderiet", the "soap boilery".
In the final years of the 19th century, the company was offering a broad range of oils, bathroom, household and soft soaps.
At the end of the 1920s, Lilleborg had developed a close relationship with Denofa, a cooking oil producing company based in Fredrikstad.
As part of this agreement, Lilleborg acquired ownership and production of several well-known Lever Brothers brands, Sunlight being perhaps the foremost.
Unilever decided to sell their stocks in the company in 1958, but agreed upon another cooperation agreement which was to last for 20 years.