Oishi
A Thai food-and-beverage brand best known for Japanese-style green tea drinks, ready-to-eat products, and Japanese restaurants.
Last updated August 28, 2026
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Overview
Oishi is a Thai food-and-beverage brand associated with Japanese-inspired products and dining. It was established in 1999 by Tan Passakornnatee, initially developing Japanese restaurant operations in Thailand before expanding into packaged beverages and convenience-oriented foods. The brand is best known for Oishi Green Tea, a range of ready-to-drink tea products that helped make bottled green tea a mainstream category in Thailand. Oishi's business has historically combined restaurant operations with manufacturing and distribution of food and beverages. Its restaurant portfolio has included Japanese buffet and casual-dining concepts, while its packaged-food activities have covered ready-to-eat meals, snacks, noodles, and other products designed for modern retail and convenience channels. This combination gives the brand a broader presence than a single beverage label: Oishi has operated across branded restaurants, grocery retail, convenience stores, food-service channels, and promotional events. The brand's central positioning is Japanese-inspired taste and lifestyle adapted for Thai consumers. Green tea is the most visible part of the portfolio, with products sold in multiple formats and flavors, including unsweetened and flavored variants. Oishi has also used the wider popularity of Japanese culture, food, and entertainment in Thailand to support product launches, restaurant traffic, and youth-oriented marketing. Oishi Group Public Company Limited became part of the Thai Beverage group. ThaiBev's control connected Oishi with a large domestic beverage, food, distribution, and hospitality network. Oishi Group was previously a listed company in Thailand, but the company was later taken private through a delisting process after ThaiBev increased its ownership. The Oishi brand remains active in Thailand through packaged products and food-service businesses. Specific current product availability, restaurant formats, and corporate leadership can vary over time and should be checked against the company's current disclosures.
History
Oishi was established in Thailand in 1999 by Tan Passakornnatee. The business began with Japanese restaurant operations at a time when Japanese cuisine was becoming increasingly familiar to Thai urban consumers. Rather than positioning itself solely as a specialist restaurant, Oishi developed a broader consumer proposition built around Japanese food, presentation, and lifestyle cues. The group later expanded into packaged food and beverages. Its most influential move was the development of Oishi Green Tea, a ready-to-drink tea line that helped introduce Japanese-style bottled green tea to a mass Thai audience. The product was distributed through modern trade, convenience stores, restaurants, and other retail channels. Packaging, flavor variety, and advertising were used to make green tea accessible beyond traditional restaurant consumption. As the beverage business grew, Oishi extended its food portfolio into ready-to-eat meals, snacks, noodles, and related convenience products. The combination of manufacturing, distribution, restaurants, and branded marketing allowed the company to reach consumers in several consumption occasions: eating out, buying a chilled or ambient packaged meal, and purchasing a beverage for immediate consumption. Oishi's restaurant activities developed through Japanese buffet and casual-dining formats. These outlets supported the brand's Japanese association while also functioning as direct consumer touchpoints. The restaurant business and packaged-products business were complementary but operationally distinct, with the packaged business relying heavily on production capacity and broad distribution. The company's corporate history became closely linked to Thai Beverage Public Company Limited. ThaiBev's investment and subsequent control placed Oishi within one of Thailand's largest consumer-products groups, alongside beverage, food, and hospitality businesses. Oishi Group had previously been traded on the Stock Exchange of Thailand, but after ThaiBev consolidated ownership, the group pursued delisting and continued as a controlled, non-listed company. Today, Oishi is principally recognized in Thailand for ready-to-drink green tea and Japanese-inspired food. Its relevance comes from combining a highly recognizable beverage brand with restaurant concepts and convenience-oriented food products. Because product ranges, restaurant banners, ownership arrangements, and management can change, current details should be verified through Oishi Group and Thai Beverage corporate disclosures.
- 1999
Oishi is established
[1]Tan Passakornnatee establishes the Oishi business in Thailand, initially focusing on Japanese restaurant operations.
Expansion into packaged beverages
[1]Oishi expands beyond restaurants into packaged food and ready-to-drink beverages, with green tea becoming its best-known consumer product.
Oishi Green Tea becomes a core brand
[1]The Oishi Green Tea range develops into a major part of the brand's Thai retail presence through modern trade and convenience channels.
Thai Beverage gains control
[2]Thai Beverage increases its ownership of Oishi Group and integrates the business into its broader food and beverage portfolio.
Transition to non-listed subsidiary status
[3]Oishi Group completes a process associated with delisting from the Stock Exchange of Thailand and continues under Thai Beverage control.
Products and positioning
Japanese-inspired food and beverage products for the Thai mass market, spanning ready-to-drink tea, convenience foods, and Japanese dining.
Ready-to-drink tea
Oishi Green Tea
Oishi's best-known packaged product line is a ready-to-drink green tea range sold in Thailand. It has been offered in different sweetness levels, flavors, and package formats, making Japanese-style green tea suitable for mass retail and convenience-store consumption. The line is central to Oishi's identity and represents the group's expansion from Japanese dining into branded consumer beverages.
Packaged food
Oishi ready-to-eat foods
Oishi's packaged-food activities include Japanese-inspired ready-to-eat meals and other convenience-oriented foods. These products extend the brand's restaurant heritage into retail and are designed for consumers seeking quick meals or snacks through supermarkets, convenience stores, and related channels. Exact product lines and availability vary by period.
Japanese dining · 1999
Oishi Japanese restaurants
The restaurant business is the historical foundation of Oishi and has included Japanese buffet and casual-dining concepts. Restaurants provide a direct expression of the brand's Japanese positioning while also supporting food development and consumer familiarity. Formats, names, locations, and operating status may change as the group adjusts its dining portfolio.
Brand decisions
- Thai Beverage consolidates Oishi ownershipM&A
Background
Oishi's growing food-and-beverage operations became strategically relevant to Thai Beverage's wider consumer portfolio.
Action taken
Thai Beverage increased its ownership and brought Oishi Group under its control.
Aftermath
Oishi continued as a Thai Beverage-controlled food-and-beverage business, with access to the group's distribution and corporate resources.
- Delisting and transition to private subsidiary statusStrategy
Background
Following Thai Beverage's control of Oishi Group, the listed-company structure was no longer necessary for the parent group's ownership model.
Action taken
Oishi Group pursued delisting from the Stock Exchange of Thailand.
Aftermath
The business continued as a non-listed subsidiary within the Thai Beverage group.
Sources3 sources
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