It was formed in 1977 to protect the interests of independent retailers against the growth of the big retailers.
By the year end in April it had over 1,080 registered shareholders operating over 3,850 stores.
Shopkeepers can operate under their own names or under the Nisa brand name. The group has also introduced a new fascia called Loco.
Nisa describes itself as a mutual style organisation which is run solely for the benefit of members.