Read said Steinlager, as a total trademark, had out-sold official World Cup sponsor Heineken - brewed under licence by DB Breweries - in supermarkets during the tournament, according to data from market research firm AC Nielsen.
And tap volumes for Irish beer Guinness, which Lion manufactures under licence, were 159 per cent up on the same period last year.
"Every day, for three weeks, was a bit like a St Patrick's Day [for Guinness sales]," Read said.
DB Breweries managing director Brian Blake said sales since the event began were up on the same period last year.
"Driving sales is the fact Heineken and Amstel Light are the only beer offerings in stadia and official fan zones, but retail sales are also strong with rugby fans obviously taking the opportunity to enjoy a couple of beers at home while watching games," he said.
And it's not just the big brewers that have been benefiting from the event.
Sunil Unka, marketing manager for Blenheim-based craft beer maker Moa, said the firm saw a 56 per cent spike in sales in September, compared with August.
"That's a fairly significant sign that the Rugby World Cup has had a positive effect for us," he said. "We won't be surprised to see similar [sales] in October, especially once we beat the Aussies on Sunday."