The current head office location is Kichijoji Honmachi, Musashino City, Tokyo.

[6] In 1991, Seiyu formed a consortium with six Asian retailers and one Hawaiian company to exchange expertise and set up joint ventures across Asia.

[8] In 1996, Seiyu expanded to Thailand with local realtor Bang Chang, with its first outlet opened on September 26.

[16] Over the 2019-2020 period, Seiyu comparative-store sales grew 180 basis points faster than the market and EBITDA increased by nearly 40%.

[17] In 2020, Walmart announced they would be selling 65% of their shares in the company to private-equity firm KKR in a deal valuing 329 stores and 34,600 employees at $1.6 billion.

Walmart is supposed to retain 15% and a seat on the board, while Japanese e-commerce giant Rakuten Inc. will receive 20%.