TJX Cos., the Framingham-based retailer that operates such off-price chains as T.J. Maxx, Marshalls, and HomeGoods, said Tuesday that third-quarter net sales rose 11 percent to $6.4 billion from a year ago and because of its “strong momentum,” the company added that it is raising full-year guidance.

Net income for the quarter was $462 million versus $406 million last year. Diluted earnings per share were 62 cents, up 17 percent; that increase was “above plan,” TJX said in a press release.