Occupy Melbourne activists have staged rowdy rallies outside the Melbourne Stock Exchange on Collins Street this afternoon.

About 50 police guarded the doors to the building as the protesters, waving banners and signs, chanted in the street.

The protest outside the ANZ Bank in William Street.

The group of about 80 protesters spilled on to the street, with police directing traffic.

At 12.30pm they marched to Collins Street, stopping traffic, and up Wiliam Street where they sat on the road outside the ANZ Bank.