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Comparative law discussions about the future of company law in a global economy must include the general topic of the impact of technology on the corporate world and our financial system and the challenges this poses for regulators.While the use of technology, for example to facilitate shareholder meetings and facilitate share trading, can be beneficial these same technological advances have the potential to significantly challenge traditional operations of financial markets and cause significant harm.One example of this is the case of high speed trading.An example of such harm is seen in the US stock market "flash crash" of May 6, which resulted in the loss of almost $1 Trillion dollars in the US market in a matter of minutes, with the consequent undermining of investor confidence in the market.This paper explores some of the legal issues and post-mortem regulatory reforms to limit the potential disruption and harms caused by high frequency trading (HFT).The lessons learned from the "flash crash" are especially important to other share markets around the world, such as China, as the spread of high frequency trading becomes increasingly global as HFT moves increasingly into Asian markets and thus the potential of a world-wide flash crash could threaten a global share market meltdown.Specifically, this paper defines high frequency and algorithmic trading and explains briefly the techniques used by HFT.It identifies the advantages of HFT that have led to its rapid growth and increasing share of the market.Concerns that have been raised about HFT are highlighted.Regulatory responses to HFT in the US,Australia, the European Union and Asia are summarised and the need for ongoing research and regulatory reform is stressed.