By Chiara Albanese 

Foreign-exchange broker FXCM Inc. will stop trading a number of currencies later this week to avoid volatility caused by possible future intervention by governments in currency markets, according to a person familiar with the matter.

The New York-based broker lost millions of dollars following the sharp currency swings resulting from the Swiss National Bank's decision to remove its cap on the value of the franc on Jan. 15. It has begun notifying clients that on Feb. 20 it will remove a number of currencies, including the Hong Kong dollar and Danish krone, from its platform, the person said.

"We are removing currency pairs from the platform that carry significant risk due to overactive manipulation by their respective governments either by a floor, ceiling, peg, or band," said the firm's chief executive Drew Niv.

After the 30% move in the Swiss franc exchange rate which followed the central bank's removal of the cap on the value of the currency earlier this year, FXCM was left chasing about $225 million from retail clients who were caught on the wrong side of bets on the Swiss franc. Collateral put down to guarantee those bets wasn't sufficient to cover the currency move on that day, which was unprecedented.

In order to continue operations, FXCM secured a $300 million loan from Jefferies Group LLC-parent Leucadia National Corp.

"Given what happened with [the franc], the industry is now looking very hard at potential similar issues especially given the increased geopolitical risks in Southern and Eastern Europe," Mr. Niv said.

Under the changes, beyond major currencies, FXCM will only offer trading in the Turkish lira, the South African rand and the Chinese renminbi. It will also increase the margin requirements that clients will have to pay to trade in these currencies.

Fearing similar market fallout to that seen in the Swiss franc if more central banks, such as Denmark's, were to abandon their currency pegs, some banks and brokers are implementing stricter requirements for clients looking to trade those currencies.

The prime brokerage arm of Citigroup Inc., the largest dealing bank for foreign exchange, is boosting its prices for clearing and settling trades for selected currency pairs by about 25%, according to a person familiar with the move.

Citigroup is FXCM's largest prime broker for foreign exchange, and the division also provides clearing and settlement services for institutional clients, including hedge funds and retail brokers.

The U.S. bank suffered about $150 million in losses following the sudden surge in the Swiss franc following the central bank's announcement last month, according to people familiar with the matter.

Other banks are considering similar plans to increase the cost of prime brokerage services, according to several people familiar with the matter.

"Banks are reassessing their risk requirements, that's for sure," said a New York-based senior foreign exchange trader.

The greatest focus, he added, is on the Danish krone, which has been pegged against the euro since 1982 to keep inflation low and provide stability for exporters. In an effort to stem inflows into the currency and to keep the peg in place, the Danish central bank has been forced to cut rates several times in recent weeks and suspend the issuance of government bonds.

"If the peg goes away, banks would face similar risks to the ones seen after the SNB decision," he said.

Gain Capital is among the brokers asking clients to put down larger collateral to trade currencies. Starting Feb. 6, the U.S. firm increased minimum margins for selected currencies including the Danish krone, the renminbi and the Hong Kong dollar.

"In light of the recent decision by the Swiss National Bank to remove the peg in EUR/CHF on 15 January 2015, there have been increased market concerns about the soundness of other pegged currencies," a spokesman said.

Interactive Brokers has also increased the margins required for selected currencies. The U.S. broker is now asking a 5% margin for the Swiss franc, compared with a 2.5% margin before Jan. 21, and a 20% to trade the Russian ruble. The previous margin was 15%.

Total losses faced by the largest currency prime brokers following the Swiss National Bank move add up to several hundred millions, according to several people familiar with the market.

Write to Chiara Albanese at chiara.albanese@wsj.com

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