Adjusted pretax profit jumped to 7.2 million pounds in the 28 weeks ended January 11 from 4.9 million pounds a year earlier.
Revenue rose 4.5 percent to 139.7 million pounds.
Thorntons' shares closed at 153.50 pence on Friday on the London Stock Exchange.
(Reporting by Aastha Agnihotri in Bangalore; Editing by Robin Paxton)