The profit margin was "broadly in line" with the previous year, which it said was positive given the higher cost of goods as a result of foreign exchange rate movements.
Its Noel Leeming appliance and technology stores increased sales 17 per cent to $180.6 million while same-store sales gained 18 per cent.
Grayston said the unit continued to grow market share through the quarter in a competitive environment. Cellular and wearables sales improved due to better stock availability of smartphones, and whiteware sales also performed well.
The company consolidated its three Noel Leeming clearance stores into one site at Mt Wellington in Auckland, reducing total store numbers at the end of the quarter to 75 from 77 at the start of the quarter, although the overall footprint of the chain increased to 71,927 square metres from 71,079.
Its Warehouse Stationery 'blue shed' stores increased sales 3.3 per cent to $72.5 million, up 1.4 per cent on a same-store basis. It added one new store in the quarter, taking the total to 67 and increasing the total footprint to 72,214 square metres from 71,222.
Its Torpedo7 sports chain grew sales 14 per cent to $34.8 million, which the company said more accurately reflected underlying improvements in performance, without the impact of new store openings.
Group online sales rose 23 per cent to $40.5 million after adjusting for the divestment of ShopHQ, and the company noted it's making further investments after the Warehouse Stationery web store went live in mid-April.
Warehouse shares last traded at $2.74 and have advanced 2.6 per cent this year. The stock is rated a 'sell', according to the mean estimate of five analysts compiled by Reuters.