(Reuters) — Alphabet’s Google unit is mulling a bid for Yahoo’s core business, Bloomberg reported, citing a source.

Verizon, which has been rumored to consider bidding for Yahoo, plans to make a first-round bid for the Internet giant’s web business next week, Bloomberg reported, citing people familiar with the matter.

AT&T, Comcast and Microsoft are not bidding this time, Bloomberg said on Thursday.

Yahoo shares were down 1 percent and Verizon shares were down 3 percent.

Yahoo launched an auction of its core business in February after it shelved plans to spin off its stake in Chinese e-commerce giant Alibaba.

Verizon and Yahoo declined to comment.

Google, AT&T, Comcast and Microsoft could not be reached immediately for comments.

(Reporting by Rishika Sadam in Bengaluru; Editing by Don Sebastian)