Shares of Piraeus Port Authority were down 8.9 percent, at 9.83 euros, at 0902 GMT. PCC was down 7.4 percent.
One of the first decisions announced by the Syriza government was stopping the planned sale of a 67-percent stake in Piraeus Port Authority. Energy Minister Panagiotis Lafazanis also told Greek television earlier that the Syriza government would halt plans to privatise PPC.