London | Australian ETF pioneer Graham Tuckwell’s public stoush with WisdomTree, the US-listed company that bought his European business, has turned vitriolic ahead of a showdown at the company’s AGM next month.

In a letter to its shareholders released late last week, the $US91 billion ($136 billion) ETF manager accused Mr Tuckwell of previously mistreating his own investors, and attacked what it called his “high-handed, self-serving conduct and his violations of corporate governance practices”.