TOKYO, May 19 (Reuters) - Japan tightened regulations on high-frequency trading (HFT) this week, passing into law measures that will require HFT firms to register with regulators.
Other nations in Europe and elsewhere in Asia are looking to tighten the leash on high-frequency traders who program ultra-fast computers to trade in milliseconds without human intervention. Some major U.S. exchanges want to introduce speed limits on trading.
The growing presence of HFT on the Tokyo Stock Exchange (TSE) has raised concerns high-speed trading could destabilise markets and leave retail investors at a disadvantage.
The law was passed by parliament on Wednesday and the new regulations could come into force as early as 2018.
Japan's market regulator, the Financial Services Agency (FSA), has said previously it wanted HFT participants to register and to ensure proper risk management measures were in place.
"The definition has not yet been created. We can guess at who might be affected, but we don't know for sure the full scope of who will be affected," said Seth Friedman, chief executive of advisory firm Shiroyama Consulting Co..
The new rules stipulate that a company engaging in HFT will have to establish an office in Japan or be represented in the country by an agent.
HFT accounted for about 70 percent of orders on the Tokyo Stock Exchange in 2016, FSA estimates show.
High-speed trading accounted for slightly less than half of actual traded value, according to market participants, taking into account order cancellations. That would amount to slightly less than 321 trillion yen ($2.9 trillion) based on figures on the TSE website for total trade in cash equity of 643 trillion yen. (Reporting by Lisa Twaronite; Editing by)