Since its founding in 1994, it has expanded to 27 locations as of 2024, including opening restaurants in Spain, the United Kingdom, and most recently Romania.

The company ran restaurants with other brands as well, including one of its current sister chains, Captain Cook, and the group grew to a total of 20 locations spread out in seven cities and three of the country's summer resorts by 2002.

[1] In 2019, the chain opened its first restaurant in the United Kingdom on Piccadilly in London, with ambitions to develop and sell a franchise model from there.

[2] In 2024, the first Happy restaurant in Romania opened in AFI Cotroceni in Bucharest, with plans to grow the chain's total number of locations worldwide to 70 by 2030.

[8] The Happy Group, the local parent company, continues to run four other restaurants under different brands, including three in the country and one in Singapore.