Hunky Dorys owner Intersnack saw its revenue in Ireland climb 5% to €99.3m (£85m) last year, according to accounts for the German firm.
The unit in the Republic also manufactures snacks under brands including Tayto, King, Perri, Velvet Crunch and Hunky Dorys.
The company's Irish Tayto brand is unrelated to Northern Ireland's own Tayto crisps.
Speaking about its Irish operation, Dusseldorf-headquartered Intersnack said: "In particular, brand business with the key Tayto brand, which accounts for more than 40% of the company's revenue, developed soundly year on year."
The division is based in Kilbrew, Co Meath. Intersnack has wholly owned Largo Foods since 2015, having first acquired a stake in the business in 2011.
The Irish company was founded by Ray Coyle, who continues to own the successful Tayto Park amusement park next to the crisp factory in Co Meath.