Its headquarters are in Pasay in Metro Manila. Oishi, started in 1946 as Liwayway, was originally a family-owned corn starch (Tagalog: gawgaw) and coffee repacking business. The name of the business, “Liwayway,” meaning “dawn” in Tagalog, was selected to reflect the optimism of the Philippines following the aftermath of World War II.

By 1966, in addition to distributing starch, the company also was distributing basic commodities, coffee, and confectioneries. It was incorporated as the Liwayway Marketing Corporation (LMC) in 1966. Brothers Carlos and Manuel Chan, at the time, were behind the company. Their brother Ben is the founder of Bench, a Philippine clothing brand.

The company began distributing Oishi Prawn Crackers and Kirei Yummy Flakes in 1974. The company claims to have used technology from Japan to make the products.

Carlos Chan began prospecting on the expansion of Oishi to China in 1984, following the liberalization of the Chinese economy under Deng Xiaoping starting in 1978. 

Liwayway went under the name Oishi Shanghaojia, appending “Shanghaojia” (上好佳) to Oishi which literally means “top grade and high quality” in Chinese. It entered a joint venture with two state-owned Chinese firms and opened its first overseas manufacturing plant in Pudong, Shanghai The company’s China division set up its headquarters in Qingpu District, Shanghai.

To improve distribution in China, the company established a factory network there. Oishi also established a presence in Vietnam in 1997 and in Myanmar in 1999. In 2006, factories were opened in Indonesia and Thailand. Interlink Direct Ltd. imports Oishi products from China to the United Kingdom.

In 1998, for his contributions to Shanghai, Carlos Chan received a “Magnolia Gold Award,” a prize that recognizes expats who contribute to Shanghai’s development. In 2005, the City of Shanghai made Carlos Chan an honorary citizen, and Oishi Shanghaojia was declared a “Shanghai famous brand” the following year.

According to Wikipedia