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[学科前沿] 【转】美国证交会永久性禁止裸卖空操作 [推广有奖]

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yhongl12 发表于 2009-7-28 10:27:51 |AI写论文

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美国证交会永久性禁止裸卖空操作http://www.sina.com.cn  2009年07月28日 03:28  新浪财经


  新浪财经讯 北京时间7月28日凌晨,联邦证管机构决定将一项禁止裸卖空的临时性法令延伸为永久性有效。美国证交会(SEC)宣布,这项法令针对一种所谓“裸卖空”的卖空操作。原来的临时性法令将于本周五到期。
  卖空者赌的是股价下跌。通常他们借入一家公司的股票然后售出,等股价下跌后再购回等量的股票然后将它们还给借出者,将其中的差价收入自己囊中。“裸”卖空指的是卖家甚至在没有借得股票前就开始售股,然后在售股后一段时间内平仓。
  SEC的法令中包括如下要求:券商在卖空操作时必须迅速购买或借得相关证券。与此同时,SEC已开始考虑采取一些新的措施来限制常规的卖空操作,常规卖空也能够导致股市价格急速下挫。
  一些投资者和议员一直要求SEC采取新的限制措施,遏制导致去年秋天开始的股市下跌进一步恶化的操作。SEC的主席夏皮洛(Mary Schapiro)早已表示,她已经把此事视为当务之急。
  今年四月5位SEC的委员经表决后决定将5个替代性卖空计划公示于众。一个选择方案是恢复大萧条时期的一项规定:在股价较上日交易价至少上涨1美分前禁止卖空者操作。这一规定的目的是防止抛卖形成自我恶性循环,过去的一年中银行股和其他一些公司的股票都遭受了这种抛卖的严重冲击。
  另一个备选方案是如果股价下跌10%或以上,当天余下的交易时间内将不得进行卖空操作。
  SEC宣布,除了将禁止裸卖空的法规永久化之外,SEC及其工作人员还在与大型股票交易所进行协作,通过交易所的网站公布卖空交易及其交易量的数据。SEC指出,这一规定将导致目前所要求的必须披露信息“大幅增加”。
  夏皮洛在一份声明中指出:“今天的行动表明SEC决心解决卖空操作被滥用的问题,同时将更多地公开披露影响我们市场的卖空活动的信息。”
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关键词:永久性 证交会 股票交易所 新浪财经 恶性循环 北京时间 新浪财经 临时性 美国 机构

沙发
yhongl12 发表于 2009-7-28 10:36:14
SEC makes permanent its rule to rein in short selling
But lawmakers say the measure doesn't effectively limit the practice
By Ronald D. Orol & Alistair Barr, MarketWatch
WASHINGTON (MarketWatch) -- The Securities and Exchange Commission on Monday made permanent a temporary commission rule seeking to rein in "naked shorting," but some lawmakers argued the regulation is weak and they proposed an alternative approach.

  "Until the SEC actually toughens its rules so that abusive short selling can be stopped effectively with enforceable standards, I am concerned that the abuses that took place last year that hastened the demise of Lehman Brothers and Bear Stearns could happen again," said Sen. Ted Kaufman, D-Del.
"Instead of proposing action today to deal with the problem, the SEC apparently is content to let potential solutions sit on the shelf for another two months," Kaufman said.
Naked short selling is the practice of selling a stock short without first borrowing the security or ensuring that the security can be borrowed as is done in a conventional short sale.
  The regulator introduced a rule last year to limit naked shorting by requiring broker-dealers to promptly purchase or borrow securities that they would use to deliver on a short sale. That was set to expire July 31, and the SEC said Monday it made the rule permanent.
  However, Kaufman and a group of lawmakers argued that the SEC's steps to rein in naked short selling aren't effective at clamping down on naked short sellers. They are hoping the agency considers a pre-borrow requirement that they believe could end the problem of naked short selling.
  With a pre-borrow requirement an institution would be required to arrange formally to borrow shares, or "pre-borrow" before engaging in a short sale. Without a pre-borrow requirement it is generally enough for a broker to determine that it has a reasonable basis to deliver the securities when an investor seeks to borrow shares for a short sale.
  In an emergency action last year, the SEC temporarily required hedge funds and other short-selling institutions to pre-borrow shares, but it let that provision expire.
  The SEC proposed discussing a pre-borrow requirement and other short sale provisions at a public roundtable discussion it has scheduled for Sept. 30. Kaufman and other lawmakers want SEC to launch a pilot program to study whether a pre-borrow requirement would end the problem of naked short selling.
  "I am pleased that the SEC has announced some new transparency measures and a roundtable on September 30 on the agenda to curb the abuses of naked short selling," Kaufman said.
Collection of data
  The SEC also said it would no longer require hedge funds and other institutional investors to provide short-sale position data to the agency on a weekly, confidential basis. That provision, which was adopted in October, is set to expire on Aug. 1.
  Instead of collecting data on short-sales, the regulator said it was taking steps to increase the public availability of information related to short sales, including an effort that would make public short-sale volume and transaction data available publicly.
In the next few weeks, the SEC said it expects self-regulatory organizations such as stock exchanges to start publishing aggregate short-selling volume in individual equity securities daily on their Web sites. However, short sellers would not be required to make their positions publicly available.
"These actions should provide a wealth of information to the commission, other regulators, investors, analysts, academics and the media," the SEC said in a statement.
Uptick
  Separately, under pressure from lawmakers and financial institutions, the SEC in April approved the release of five different proposals for reinstating the up-tick rule, a provision that would limit short selling. SEC Chairwoman Mary Schapiro said last week the agency plans to adopt one or more up-tick rules by the end of summer.
  The five SEC proposals, which were put out for comment vary from reinstating an old rule to creating a new rule that would only apply in severe market conditions.
The uptick rule, which was removed in 2007 after 70 years, allowed short sales only if the preceding sale boosted a company's stock price by at least a penny. The uptick rule was designed to make sure short sellers couldn't dominate trading in a stock to drive its price lower.
Ronald D. Orol is a MarketWatch reporter, based in Washington.

Alistair Barr is a reporter for MarketWatch in San Francisco.

藤椅
fuguitop 发表于 2009-7-28 10:46:43
金融工程的教材岂不是得重写?

板凳
yhongl12 发表于 2009-7-28 10:53:12
RELATED DESCRIPTION
Normal shorting
Short selling is a form of speculation that allows a trader to take a "negative position" in a company. Conventionally, the trader will "borrow" securities from a current shareholder, typically a bank or prime broker, agreeing to return them on demand. The seller delivers these shares to a buyer, who takes full ownership and likely does not know that he is participating in a short sale. When the seller wants to "unwind" the position, he buys back equivalent shares in the market and returns them to the lender.
This short/borrow system provides the trader with shares to sell at current prices, in the hope that he will profit by repurchasing them later when the price has lowered. Because the seller/borrower is generally required to make a deposit for the full share price with the lender, it also provides the lender with interest on a position that he was not actively trading.


Naked shorts in the United States
Naked short selling is a case of short selling without first arranging a borrow. If the stock is in short supply, finding shares to borrow can be difficult. The seller may also decide not to borrow the shares, in some cases because lenders are not available, or due to the costs of lending. When shares are not borrowed within the clearing time period and the short-seller does not tender shares to the buyer, the trade is considered to have "failed to deliver."[12] Nevertheless, the trade will continue to sit open or the buyer may be credited the shares by the DTCC until either the short-seller closes out the position or borrows the shares.
It is difficult to measure how often naked short selling occurs. Fails to deliver are not necessarily indicative of naked shorting, and can result from both "long" transactions (stock purchases) and short sales.
Naked shorting can be invisible in a liquid market, as long as the short sale is eventually delivered to the buyer. However, if the covers are impossible to find, the trades fail. Fail reports are published regularly by the SEC[14], and a sudden rise in the number of fails-to-deliver will alert the SEC to the possibility of naked short selling. In some recent cases, it was claimed that the daily activity was larger than all of the available shares, which would normally be unlikely.

The Economics of Naked Short Selling
BY CHRISTOPHER L. CULP
CompassLexecon
AND J.B. HEATON
Bartlit Beck Herman Palenchar & Scott LLP

报纸
yhongl12 发表于 2009-7-28 11:02:54
一般的金融工程教材都会提到Normal shorting,Normal shorting 还是没有被禁止的吧。这件事可以看做是加强监管的一项举措吧。

地板
旃煦涵 发表于 2009-7-29 19:50:57

7
swok20012001 发表于 2009-7-30 11:57:21
针对“裸”卖空问一个问题:“裸”卖空指的是卖家甚至在没有借得股票前就开始售股,既然连股票都没有,那么卖什么呢?

8
yhongl12 发表于 2009-7-30 12:05:13
卖空:先向券商借入某股票(一般券商都会持有某些大型企业的股票),然后在市场上卖出,待价格浮动到投资者认可的范围,再从市场上买入股票,还给券商,和做多一样,当卖出价格高于买入价格,就赚钱。这种卖空不会制造虚假的卖盘,一般都是允许的。

裸卖空:其实就是省略了借入股票的过程,一般需先向券商缴纳一定的保证金,然后你就可以在市场上声称你拥有某只股票了,通过券商卖出该股票(当然,你可以始终是没有该股票的),待价格浮动到你认可的范围,再从市场上买入股票,平了你先前的卖空仓位,因为你有保证金或者某些抵押,所以一般不视作诈骗的。和卖空一样,当卖出价格高于买入价格,就赚钱。这种卖空会在市场上制造虚假的卖盘,造成交易的股票比实际发行的股票要多,一般国家都是严格限制的。

我想理解了金融期货的原理,就很容易理解"裸卖空"的机制吧。即从建立卖空仓位到实际交割日之间有一段时间,虽然卖的是股票,但是不属于现货交易而是和期货交易很像。

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