Comcast Pursues Sky While Assessing Bigger Move for Fox Assets

Cable giant officially bids $31 billion for pay-TV operator Sky, explores whether to play interloper on Disney’s pending acquisition of Fox’s entertainment assets

Comcast Corp. lobbed an official $31 billion proposal to buy European pay-TV operator Sky PLC—but it may have a much bigger deal in mind down the road.

Comcast’s official bid to buy Sky tops an existing offer from21st Century Fox, which already owns a 39% stake in Sky. Comcast said it was considering such an offer in February.

The official...