Tesco is multinational retailer, while Booker is a food wholesaler.
Both companies involved in the merger are based in the UK.
Walgreens Boots Alliance has announced the amendment and extension of a definitive merger agreement signed earlier with Rite Aid.
As part of the amendment, Walgreens Boots Alliance will acquire all the outstanding shares of Rite Aid.
Walgreens Boots Alliance is a global health company, while Rite Aid is a retail pharmacy chain.
Both companies are based in the US.