It is not just CBA that has felt the pain this week. National Australia Bank, where chief executive Andrew Irvine has been under intense investor scrutiny over his leadership style and alleged drinking at client events, is down 3.9 per cent. ANZ is down 1.2 per cent, and Westpac shares have fallen 3 per cent. Westpac hit a high of $34.71 in February, and since then, its stock has slid more than 9 per cent.