Shares of Comcast fell 6 percent on Monday, as investors feared the cable giant overpaid for UK pay-TV provider Sky.

Comcast outbid rival Fox for the London-based broadcaster by $3.6 billion to win Saturday’s three-round process with a final offer of $39 billion.

In contrast, the stock of the auction’s ostensible losers both rose.

Fox gained 1.5 percent, to $45.01, while Disney gained 2.2 percent, to $112.77.

The biggest gainer was Sky, which rose another 8.6 percent and prompted research firm MoffettNathanson to note the stock has commanded a 125 percent premium since it went in play 21 months ago.

Sky gives Comcast its first huge overseas footprint.