An initiative of José Jesús Millán senior, this supermarket chain was born in 1969. Over time, Atomo has become the emblematic supermarket of Mendoza province.

It comprises 116 branches located in Mendoza, San Juan, San Luis and Córdoba provinces, set up in strategic sites, where they are most needed.

Moreover, the chain has its own bakery and makes dairy and fresh produce, gluten-free products, as well as cooking oils. In addition, it is supplied by Frigorífico Millán, its own meat processing plant.