See also:
• Vote of confidence in Warehouse
The Australian grocery chain took the stake before rival supermarket chain Foodstuffs took a 10 per cent stake in March 2007, effectively creating a stalemate between the two competing retailers over any takeover.
The latest purchase by James Pascoe has more than doubled the investor's stake since it first emerged as a substantial shareholder with 6.3 per cent in October last year.
James Pascoe, which owns Farmers, Whitcoulls, Pascoes, Stevens, Stewart Dawsons and Goldmark, said it does not intend to make a takeover bid for New Zealand's largest listed retailer, but was investing in "another strong New Zealand brand that fits within our philosophy of supporting New Zealand retail."
The company has been lifting its stake in Warehouse, as the shares traded at a near two-and-a-half year low in January.
Warehouse shares have been under pressure since the start of the year, when it said it expects first-half earnings to fall about 20 per cent to $37 million as cold, wet spring and summer weather forced it to discount clothing and other seasonal merchandise at its 'red sheds' general merchandise stores and sales declined at its Noel Leeming consumer electronics chain.
Investors and analysts have said they want the company to produce profit growth this financial year after the retailer spent hundreds of millions of dollars overhauling stores and buying new businesses the past few years.
Warehouse shares rose 1.4 per cent to $2.86 in afternoon trading.