Transurban (ASX:TCL) sees its shares slide as much as 2.7% to A$12.770, marking their lowest value since January 3rd.

This drop follows a decision by the national competition regulator to block the toll road operator from buying a majority stake in Horizon Roads, the EastLink toll road operator based in Melbourne.

The proposed acquisition was reported to have been valued at A$2 billion in the local media.

Transurban (ASX:TCL) has stated that it is currently reviewing the regulator’s decision and planning to consider all available options.

If the losses sustained hold, this could seemingly be Transurban’s worst day in the market since September 6th.

As of the last market closure, Transurban shares were up 1.2% this year.

Transurban (ASX:TCL) is a toll road operator.