Stocks to watch at noon on Wednesday STOCKS to watch on the Australian stock exchange at noon on Wednesday: STO - SANTOS - down 25 cents, or two per cent, at $12.12 Santos boss David Knox has rejected claims one of its major Queensland coal seam gas projects wasn't subjected to a rigorous approval process. ANZ - ANZ - down 32.5 cents, or 1.08 per cent, at $28.51 ANZ's head of international and institutional banking Alex Thursby has resigned to take up a new job in the Middle East. ORG - ORIGIN ENERGY - down 26 cents, or 1.9 per cent, at $13.19 Origin Energy is considering whether to redeem more than $1.6 billion worth of hybrid securities after ratings agency Standard & Poor's said it was revising how it assigns equity content to such securities.