TORONTO--Canada is debating tighter border security--for stock trades.

The country's regulators are probing dealers" practice of routing stock orders to U.S. trading venues in exchange for rebates, circumventing domestic markets.

The payments are legal in the U.S., albeit controversial, and add up to hundreds of millions of dollars a year. But, in Canada, brokers are prohibited from paying them, and regulators there, including the Ontario Securities Commission, are exploring whether rule changes are needed to keep more trading within the country, said Susan Greenglass, the commission's director for market regulation.

The scrutiny is linked to a contentious issue in U.S. markets: payments that some companies, known as wholesalers, make to retail brokerages in exchange for sending them orders. Some critics--including Intercontinental Exchange Inc., the owner of the New York Stock Exchange--have complained that the system doesn't benefit all investors and hurts the ability for the markets to make prices.

Proponents say the practice helps match buyers and sellers, provides needed liquidity to the markets and makes trades cheaper for individual investors.

In Canada, dealers have traditionally directed at least some of their individual-investor orders to U.S. broker-dealers for stocks that are listed on both the Toronto Stock Exchange and a U.S. exchange or other trading platform. Of the 1,500 companies listed on the Toronto Stock Exchange, about 200 are also listed in the U.S.

As Canadian dealers face pressure to cut costs, the appeal of the American rebates stands to increase.

From investors" perspective, it may make little difference whether a trade is executed in Canada or the U.S., as long as they get the best available price.

The Ontario commission's concern "is about the longer-term impact on the [Canadian] market if order flow is routed to the U.S. on a broad basis," Ms. Greenglass said. The Investment Industry Regulatory Organization of Canada, the country's main stock-market watchdog, said it shares this concern.

Moves by the brokerage arms of Bank of Nova Scotia, Bank of Montreal, Canadian Imperial Bank of Commerce, Royal Bank of Canada, Toronto-Dominion Bank and others to route retail orders to the U.S. could threaten the effectiveness of Canada's stock markets, regulators say. Shrinking liquidity makes a stock market less appealing, because it becomes harder and more costly for investors to execute transactions.

RBC said it doesn't routinely route retail stock orders to U.S. broker-dealers, and TD said it doesn't engage in the practice. Representatives for the retail brokerage arms of Canada's other big banks declined to comment.

TMX Group Ltd., which operates the Toronto Stock Exchange and other exchanges, last month announced a plan to deter the diversion of retail flow to U.S. exchanges. Among the changes, which take effect next June, is a new model for TMX Group's Alpha trading platform that will pay brokers a rebate for some orders. In Canada, exchanges and trading platforms can pay for order flow, but brokers can't.

The new Alpha model is also designed to discourage some types of high-frequency traders--who use computer programs to rapidly buy and sell stocks--by slowing their ability to execute orders. These traders rely on speed to execute transactions before orders from individual investors and others are filled. By removing that advantage, TMX Group hopes to put high-frequency traders and other investors on a more equal footing.

The exchange operator's goal is "to replicate the economics [in the U.S.] so that those [Canadian] retail brokers can get quality execution and low-cost execution in Canada," Kevan Cowan, TMX Group's head of equities, said in an interview.

TMX Group said it couldn't quantify the retail order flow that its Toronto Stock Exchange and junior TSX Venture Exchange are losing to U.S. rivals, but "we are hearing from our customers that people are already doing this and others are considering it," Mr. Cowan said.

What is happening in the meantime amounts to "regulatory arbitrage," with Canadian banks circumventing domestic rules to benefit from payments in the U.S., where payment for order flow is legal, said Dave Lauer, president of the financial-market consultants KOR Group LLC.

U.S. retail brokerages can make hundreds of millions of dollars a year from such payments. TD Ameritrade Holding Corp., an Omaha, Neb.-based bank holding company whose largest shareholder is Toronto-Dominion Bank, in 2013 received about $236 million in such payments from wholesalers and exchanges, according to the company.

Some of the big broker-dealers that stand to benefit from the Canadian business are Citadel Securities, Citigroup Inc.'s Automated Trading Desk LLC, UBS Broker Services and KCG Holdings Inc., according to brokers and other market SHYparticipants.

TMX Group believes Canadian regulators will need to step in to completely resolve the issue, because of differences in regulations governing rebates for U.S. broker-dealers and Canadian brokers, Mr. Cowan said.

Write to Ben Dummett at ben.dummett@wsj.com, Rita Trichur at rita.trichur@wsj.com and Bradley Hope at bradley.hope@wsj.com

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