Intermarché Poland, which is part of Grupa Muszkieterów, has reported a 16% increase in like-for-like sales in the first half of its financial year.
Marc Dherment, director general of Grupa Muszkieterów said, "The first half of this year, despite many challenges for entrepreneurs, such as constant cost pressure, inflation, the need to incur higher investment expenditures and falling demand in the construction industry, was a successful period for us.
"We achieved satisfactory sales growth through the Intermarché network and increased Bricomarché's share in the DIY market. We are optimistic about the further growth prospects of Grupa Muszkieterów, despite the more difficult macroeconomic environment."
Grupa Muszkieterów is the Polish arm of France's Groupement Les Mousquetaires.
The company introduced the umbrella own-brand label O la la! in the first half, which now accounts for a 20% share of its private label portfolio.
Growth in turnover was boosted by the rollout of the 'Oszczędzaj cały dzień z Intermarché' (Save all day with Intermarché) marketing campaign and the launch of its first loyalty programme, 'Interkasa'.
The programme rewards purchases in the form of e-vouchers, with the value determined by the total amount of the basket.
It has resulted in an increase in transactions via the retailer's mobile application, as 'My Intermarché' gained 100,000 new users.
Elsewhere, around half of Intermarché entrepreneurs have committed to introducing self-service checkouts, and currently 24 stores have implemented it.
Bricomarché saw a 0.5 percentage point increase in market share in the first half compared to last year, according to GfK data, indicating that the network is growing faster than the competition despite a slightly weaker sales growth.
By the end of June, the DIY chain added five new supermarkets to its network, and Bricomats - special boxes for collecting products ordered online - were rolled out in 20 more cities.
Total online sales at Bricomarché over the reporting period increased by 32% year-on-year, the company added.