Egypt's security authorities raided two major retailers, Seoudi and Zad, on Sunday after their owners were proven to have backed the now-outlawed Muslim Brotherhood.
A judicial committee formed in late 2013 to handle and examine the Brotherhood's confiscated assets has ordered a freeze on the funds of both supermarkets, following the closure of all respective branches.
Zad market, which opened in 2012, is owned by prominent Brotherhood leader and businessman Khairat El-Shater, now in jail on a variety of charges. The market has 15 stores in Cairo's Nasr City district.
Seoudi, however, was established in 1938 and is owned by the businessman Abdel El-Rahman Seoudi, who was arrested in 2007 and later acquitted of charges of belonging to the banned group.
At least nine Seoudi branches have been placed under police surveillance.
A crackdown on Brotherhood members and the group's top leadership since the ouster of president Mohamed Morsi in July 2013 has also seen the group's assets confiscated and frozen.
The Brotherhood was officially declared a terrorist organisation in December 2013 by Egypt's interim authorities.