Sky added another 519,000 home broadband customers in Q2 2013, leapfrogging Virgin Media to become the UK's second-largest service provider.
The surge in subscriber numbers comes following Sky's takeover of O2 and Be Broadband's home broadband businesses, which was completed during the quarter.
Sky now has a total of 4.906 million UK broadband customers, many of whom also take home phone and subscription TV services from the firm.
Some 119,000 of the new customers were entirely new Sky acquisitions - as opposed to the 400,000 gained through the O2 and Be takeover.
Jeremy Darroch, Chief Executive of Sky, said the firm experienced another "very good" year of growth in the 12 months to June 2013.
He noted that revenues rose by seven per cent during this period, operating profits by nine per cent and earnings per share by 18 per cent.
"The strength of our financial performance is a result of our successful transition to more broadly-based growth and sustained investment to create a better service and wider range of products for customers," Mr Darroch stated.
He explained that, over the course of the year, Sky added more than three million new paid-for subscription products.
"We finished the year strongly with 11 per cent organic growth in product sales for the fourth quarter, reflecting good demand in all areas," the Sky CEO added.
He said it was a "particularly significant quarter" for home communications, as good organic growth - combined with the consolidation of the consumer broadband and fixed-line telephony business acquired from O2 - delivered over a million product additions.