Sky shares plunged 7 per cent as the market opened the morning.
The broadcaster current price is at $2.25, down from $2.43 at the close of the market yesterday.
Before the market opened, an investment expert said there was likely to be panic-selling of Sky shares this morning following the shock announcement that the company was not the preferred bidder for the 2019 Rugby World Cup rights.
"It doesn't seem to get any better for the company, and it's going to have quite an impact," said Grant Williamson, an investment advisor at Hamilton Hindin Greene.
"The indication was that they would be the preferred bidder, so it has come as a bit of a surprise to the market. It just seems to have so much against it at the moment."