More than 21 million UK consumers now drink sparkling wine, and they consumed some 110 million bottles last year, the company said in its Sparkling Wine in the UK 2014 report.
More than half of those bottles were cava and Prosecco, and Champagne showed a slight decline to around 34 million bottles.
Prosecco in particular has grown quickly, with around 6 million consumers now saying they drink it every month.
But Wine Intelligence said the fizz boom may have peaked.
The number of sparkling wine drinkers who said it was their favourite drink dropped to 20% from 24% last year, and 10% of sparkling wine drinkers now say cider is their favourite drink – up from 6% in 2013.
Chief operating officer Richard Halstead said: “Sparkling wine has been a rare good news story in the UK wine trade over the past five years, and demand remains strong. However, the rest of the alcoholic drinks category isn’t standing still, and there is now huge competition for consumer spending in the ‘everyday celebration’ occasion.”