Zoom said in a statement Tuesday it expects to give its underwriter a 30-day option to buy as much as an additional $225 million of Class A stock at the public offering price, excluding underwriting discounts and fees.

13, people familiar with the matter said, asking not to be identified because they aren’t authorized to speak publicly.

Still, Zoom said it expects an increase in sales of 330% in the current quarter, which ends in January.