Sales at TK Maxx rose 11% to £2.4bn in the year to January 2016.
Pre-tax profits were up 11% year on year £142.3m.
TK Maxx opened 25 new stores last year, and 24 more are planned in 2017. Like-for-like sales were up 4.6% on the year before.
The retailer said costs were kept low by cutting back on advertising and store fittings, as well as focusing “aggressively” on expenses.