Business and Finance

Federal regulators on Wednesday imposed new curbs on the practice of short-selling, hoping to prevent spiraling sales sprees in a stock that can stoke market turmoil.

The Securities and Exchange Commission, divided along party lines, voted 3-2 at a public meeting to adopt a new rule. Investors and lawmakers have clamored for the agency to put such brakes on trading moves they say worsened the market’s downturn in the fall of 2008.

The rule puts in a so-called circuit breaker for stock prices, restricting short-selling of a stock that has dropped 10 percent or more for the rest of a trading session and the next one. The new curbs will take effect in about 60 days, but stock exchanges have six months after that to implement them guaranteed approval cash loans.

Short-sellers bet against a stock, in a practice that is legal and widely used on Wall Street. They borrow a company’s shares, sell them and then buy them when the stock falls and return them to the lender — pocketing the difference in price.

The SEC move followed months of wrestling with the controversial issue. The SEC asked for public comment last April on several alternative approaches to restraining short-selling, and a bipartisan group of senators have pushed the agency to act or face legislation. The agency got more than 4,300 comments on the issue.

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