By Ed Ballard

LONDON--The British grocery market grew by 1.9% on the year in the 12 weeks to April 27, the slowest rate for 11 years as price competition intensified, according to data published Wednesday by Kantar Worldpanel.

Tesco PLC (TSCO.LN), J Sainsbury PLC (SBRY.LN), and Wm Morrison Supermarkets PLC (MRW.LN) all lost market share, Kantar said. Of the "big four" supermarkets, Asda Stores Ltd. fared best, maintaining its 17.3% market share and recording growth of 2% on the year.

German discount supermarkets Aldi and Lidl achieved record market shares of 4.7% and 3.5%, respectively, as did upmarket competitor Waitrose with 5.1%.

"The proportion of sales on promotion stands at 45% among the big four. By contrast, the figure at Aldi is just 3%," said Kantar director Edward Garner.

Write to Ed Ballard at ed.ballard@wsj.com

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