New York | Australian short seller Nathan Koppikar says his homeland is no longer a suitable market to bet against ASX-listed companies because of the dominance of superannuation funds, investor cliques and regulators.

Mr Koppikar, who manages about $US410million ($624 million) for Orso Partners from San Francisco, is focused on shorting stocks – where a trader profits from a falling share price – and has previously bet against the likes of Blackstone and Facebook, which helped him deliver a 70 per cent return in 2022.