Aldi is continuing its rapid expansion on Long Island, where the discount grocer has 15 stores — including nine that have opened in the last five years — and plans to open four more by summer 2026.

Aldi has at least five more Long Island grocery stores on tap, as the Germany-based chain plans to invest more than $9 billion to add 800 new U.S. stores by the end of 2028. Aldi and other discounters ...