BOSTON (TheStreet) -- Chinese reverse merger companies, already under the microscope of the Securities and Exchange Commission, are now coming under scrutiny from Interactive Brokers (IBKR) - Get Report as the online brokerage is subjecting these stocks to increased margin requirements.

Interactive Brokers

alerted customers to the new margin requirements on Friday, saying certain securities of companies formed by a reverse merger have elevated risk concerns. The margin requirement jumped to 50% Monday and will increase to 75% Tuesday and then 100% on Wednesday.

Some of the companies impacted by the new requirements include

China Integrated Energy

( GFRE),

Gulf Resources

( GFRE),

Deer Consumer Products



Orient Paper



Puda Coal


. In total, 47 companies are subject to the new margin requirements.

Trading on margin occurs when someone borrows money from a broker to purchase securities or sells a security short. Investors offer up other securities as collateral, which are deposited in a margin account. As Interactive Brokers is increasing the margin requirement on reverse-merger stocks to 100%, the implication is that the brokerage is now pricing in the worst-case scenario for many of these stocks.

After first coming under fire from short-sellers who stood to gain on a decline in share price, Chinese reverse mergers are now being probed by the SEC. Some

Chinese small-cap stocks

have plummeted as much as 75% this year, felled by the resignation of auditors to the restatement of earnings to fraud accusations by short-sellers.

Last week, SEC Commissioner Luis Aguilar noted allegations of rampant fraud among

Chinese reverse-merger companies

, although he warned it will likely prove difficult for investors to recoup damages even in cases of clear-cut wrongdoing.

Andrew Wilkinson, the media contact for Interactive Brokers, says the alert, first reported on by

Zero Hedge

, "looks like the sort of message we'd put out. When securities get volatile, this company is not shy about putting up the margin rates."

"In general, this company will shift its margin requirements as of when it sees excess volatility and it will safeguard its own interest as well as those other clients from potential losses," Wilkinson told


. "I wasn't aware of this announcement, but then again we put out a lot of announcements specifically to customers over the Web site."


E*Trade Financial

(ETFC) - Get Report


TD Ameritrade

(AMTD) - Get Report

did not immediately respond when asked if they also were considering increased margin requirements on reverse-merger stocks.

While Interactive Brokers did not specifically refer to Chinese reverse mergers, the brokerage's entire list of reverse-merger stocks subject to the new margin requirements is comprised of China-based companies. Wilkinson did not offer specific comment on the companies listed, although he says they were identified by volatility. The following 47 companies are now subject to the brokerage's new margin requirements.

  • Feihe International( ADY)
  • AutoChina International (AUTC)
  • China New Borun (BORN)
  • China Automotive Systems (CAAS) - Get Report
  • China Agritech( CAGC)
  • Chinacast Education (CAST)
  • China Integrated Energy( GFRE)
  • China MediaExpress( CCME)
  • China Century Dragon Media( CDM)
  • China Education Alliance( CEU)
  • China Green Agriculture (CGA) - Get Report
  • China-Biotics( CHBT)
  • China Natural Gas( CHNG)
  • China Gerui Advanced Materials Group (CHOP)
  • China Intelligent Lighting & Electric (CIL) - Get Report
  • China Marine Food Group (CMFO)
  • Chinanet Online (CNET) - Get Report
  • China Sky One Medical (CSKI)
  • CleanTech Innovations (CTEK) - Get Report
  • Deer Consumer Products (DEER)
  • Duoyuan Global Water( DGW)
  • AgFeed Industries( FEED)
  • Fushi Copperweld( FSIN)
  • Gulf Resources( GFRE)
  • Guanwei Recycling (GPRC)
  • SmartHeat (HEAT)
  • Zhongpin( HOGS)
  • Harbin Electric( HRBN)
  • Jiangbo Pharmaceuticals( JGBO)
  • Lihua International (LIWA)
  • Lotus Pharmaceuticals (LTUS)
  • China North East Petroleum (NEP) - Get Report
  • New Energy Systems Group (NEWN)
  • NIVS IntelliMedia Technology Group( NIV)
  • Orient Paper (ONP)
  • Puda Coal (PUDA)
  • Rino International (RINO)
  • Sino Clean Energy (SCEI)
  • ShengdaTech( SDTH)
  • Skystar Bio-Pharmaceutical (SKBI)
  • Soko Fitness and Spa Group (SOKF)
  • Synutra International (SYUT)
  • Universal Travel Group( UTA)
  • Shengkai Innovations (VALV)
  • Yongye International (YONG)
  • Yuhe International (YUII)
  • ZST Digital Networks (ZSTN)

-- Written by Robert Holmes in Boston


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