The on-the-go food retailer, fresh from the hotly anticipated launch of its 'festive bake', said total sales had risen 12.4% in the six weeks to 9 November, with like-for-like (LFL) sales up 8.3%.
With total sales unchanged from the third quarter but LFL sales improving, the year to date has seen total sales rise 13.4% and LFLs gain 9.2%.
An update in October had seen some investors take flight as the rate of LFL sales growth cool to 7.4% from 10.5% in the first half.
“Sales growth continues to be driven by increased customer visits and has been stronger than we had expected given the improving comparative sales pattern that we saw in the fourth quarter last year,” the company said in a statement.
Despite concerns raised about costs earlier in the year, the FTSE 250 group said operational costs have stayed “well controlled”.
Even though comparisons against last year become stronger still in the last few weeks of the year, the board “anticipates that full year underlying profit before tax (excluding exceptional charges) will be higher than our previous expectations”.
Greggs shares soared 16% to 2,047.01p by mid-morning on Monday.
-- Adds share price and broker comment --
Broker Peel Hunt said trading "has held up very well against the tough comparative", which was clearly ahead of management's expectations, but warned that African swine fever will have a negative impact in future.
Analysts at the broker told clients they will bump up their full-year profit forecasts from £110mln to £115mln "but that may not be enough".