Stocks to watch on the Australian stock exchange on Friday:

BHP – BHP BILLITON

Moody’s Investors Service has cut BHP Billiton Plc’s debt rating to “A3” from “A1”, citing a deterioration in the company’s earnings and cash flow.

ORG – ORIGIN ENERGY

STO – SANTOS

Energy stocks could feel the impact of international oil prices movements overnight. Prices initially resumed their downward trajectory before regaining ground late in the session.