“标准投资组合风险分析(SPAN)”是芝加哥商品交易所(CME)创建的一种计算保证金要求的方法。全球多家清算所和交易所都使用该方法来计算期货及期货期权的“履约保证”(即保证金要求)。清算所会从期货经纪商(FCM)处收取履约保证,期权经纪商则从其客户处收取。
SPAN会使用16种假设的市场情境来评估投资组合在给定期限内(通常设为一天)在最差的情况下可能遭受的损失,进而得出保证金金额。这16种假设情境会反映期货或期权合约底层价格的变动,对于期权,还会反映时间衰减和隐含波动率的变动。
计算SPAN要求的第一步是将所有底层产品相同的持仓合并为一个 “商品组合”。下一步,SPAN会计算和加总某一种情境下“商品组合”内每一个持仓的风险,并将理论损失最大的情境下的风险定义为“扫描风险”。16种情境是基于“商品组合”价格扫描范围(给定期限内底层产品的最大价格波动)和波动率扫描范围(期权最大隐含波动率变动)得出的。
假设一个投资组合由股票指数ABC的一张多头期货合约和一张多头看跌期权合约组成,底层价格为1000美元,乘数为100,价格扫描范围为6%。对于该给定的投资组合,“扫描风险”为情境14下的1125美元。
# |
1 张多头期货 |
1 张多头看跌期权 |
合计 |
情境描述 |
1 |
$0 |
$20 |
$20 |
价格不变;波动率在扫描范围内上升 |
2 |
$0 |
($18) |
($18) |
价格不变;波动率在扫描范围内下降 |
3 |
$2,000 |
($1,290) |
$710 |
价格上涨价格扫描范围的1/3;波动率在扫描范围内上升 |
4 |
$2,000 |
($1,155) |
$845 |
价格上涨价格扫描范围的1/3;波动率在扫描范围内下降 |
5 |
($2,000) |
$1,600 |
($400) |
价格下跌价格扫描范围的1/3;波动率在扫描范围内上升 |
6 |
($2,000) |
$1,375 |
($625) |
价格下跌价格扫描范围的1/3;波动率在扫描范围内下降 |
7 |
$4,000 |
($2,100) |
$1,900 |
价格上涨价格扫描范围的2/3;波动率在扫描范围内上升 |
8 |
$4,000 |
($2,330) |
$1,670 |
价格上涨价格扫描范围的2/3;波动率在扫描范围内下降 |
9 |
($4,000) |
$3,350 |
($650) |
价格下跌价格扫描范围的2/3;波动率在扫描范围内上升 |
10 |
($4,000) |
$3,100 |
($900) |
价格下跌价格扫描范围的2/3;波动率在扫描范围内下降 |
11 |
$6,000 |
($3,100) |
$2,900 |
价格上涨价格扫描范围的3/3;波动率在扫描范围内上升 Range |
12 |
$6,000 |
($3,375) |
$2,625 |
价格上涨价格扫描范围的3/3;波动率在扫描范围内下降 |
13 |
($6,000) |
$5,150 |
($850) |
价格下跌价格扫描范围的3/3;波动率在扫描范围内上升 |
14 |
($6,000) |
$4,875 |
($1,125) |
价格下跌价格扫描范围的3/3;波动率在扫描范围内下降 |
15 |
$5,760 |
($3,680) |
$2,080 |
极端价格上涨(价格扫描范围的3倍)* 32% |
16 |
($5,760) |
$5,400 |
($360) |
极端价格下跌(价格扫描范围的3倍)* 32% |
然后,用“扫描风险”加上同商品跨月价差风险值(衡量期货日历价差基础风险的值)和交割风险值(衡量可交割的持仓由于临近到期日而上升的风险),再减去跨商品价差折抵值(由于有相关性的产品互相分散了风险而降低的保证金要求)。 将该合计值与做空期权的最低保证金要求比较(做空期权的最低保证金要求能确保对包含深度价外期权的投资组合收取了最低的保证金),取两者中较大的值作为“商品组合”的风险。系统会用前述方法逐一计算所有“商品组合”的风险。投资组合的总保证金风险等于所有“商品组合”风险的总和减去由于不同“商品组合”间风险分散而折抵的保证金。
计算SPAN保证金要求的软件叫作“PC-SPAN”,可在芝商所的网站上找到。
简介
更多信息
期货期权和期货的保证金是由交易所根据SPAN保证金计算方法确定的。有关SPAN保证金系统及其计算逻辑,请参见芝商所(CME)网站www.cmegroup.com。在芝商所网站搜索SPAN,您会看到很多包括其计算逻辑在内的相关信息。SPAN保证金系统是一个通过分析几乎所有市场情境下的假设情况来计算保证金要求的保证金计算系统。
SPAN的运行逻辑大致如下:
SPAN会通过计算由衍生品和实物产品所构成的投资组合在给定时间区间(通常为一个交易日)内的最坏情况损失来评估投资组合的整体风险。最坏情况损失通常是通过计算投资组合在不同市场行情下的盈亏情况来完成。该计算方法的核心是SPAN风险阵列,即一系列可显示某特定合约在不同行情下的盈亏情况的数据。每种行情算作一种风险情境。每种风险情境的数值代表该特定合约在对应价格(底层证券价格)变化、波动率变化和时间衰减的特定组合下会产生的盈亏。
交易所会以特定频率向IBKR发送SPAN保证金文件,接着,该等文件会被导入到SPAN保证金计算器当中。所有期货期权,除非已经过期或是平仓,否则始终都需要计算风险损失情况,哪怕处于价外也没有关系。所有情境都必须考虑极端市场波动情况下的变化,因此,只要仓位还在,该等期货期权的保证金影响就还要被纳入考量。 我们会将SPAN保证金要求与IBKR预定义的极端市场波动情境进行比较,取较大者作为保证金要求。
Introduction
Where to Learn More
Tools provided to monitor and manage margin
How to determine if you are borrowing funds from IBKR
Why does IBKR calculate and report a margin requirement when I am not borrowing funds?
The Standard Portfolio Analysis of Risk (SPAN) is a methodology developed by the CME and used by many clearinghouses and exchanges around the world to calculate the Performance Bond (i.e., margin requirement) on futures and options on futures which the clearinghouse collects from the carrying FCM and the FCM, in turn, from the client.
SPAN establishes margin by determining what the potential worst-case loss a portfolio will sustain over a given time frame (typically set to one day), using a set of 16 hypothetical market scenarios which reflect changes to the underlying price of the future or option contract and, in the case of options, time decay and a change in implied volatility.
The first step in calculating the SPAN requirement is to organize all positions which share the same ultimate underlying into grouping referred to as a Combined Commodity group. Next, SPAN calculates and aggregates, by like scenario, the risk of each position within a Combined Commodity, with that scenario generating the maximum theoretical loss being the Scan Risk. The 16 scenarios are determined based upon that Combined Commodity’s Price Scan Range (the maximum underlying price movement likely to occur for the given timeframe) and Volatility Scan Range (the maximum implied volatility change likely to occur for options).
Assume a hypothetical portfolio having one long future and a one long put on stock index ABC having an underlying price of $1,000, a multiplier of 100 and a Price Scan Range of 6%. For this given portfolio, the Scan Risk would be $1,125 scenario 14.
# |
1 Long Future |
1 Long Put |
Sum |
Scenario Description |
1 |
$0 |
$20 |
$20 |
Price unchanged; Volatility up the Scan Range |
2 |
$0 |
($18) |
($18) |
Price unchanged; Volatility down the Scan Range |
3 |
$2,000 |
($1,290) |
$710 |
Price up 1/3 Price Scan Range; Volatility up the Scan Range |
4 |
$2,000 |
($1,155) |
$845 |
Price up 1/3 Price Scan Range; Volatility down the Scan Range |
5 |
($2,000) |
$1,600 |
($400) |
Price down 1/3 Price Scan Range; Volatility up the Scan Range |
6 |
($2,000) |
$1,375 |
($625) |
Price down 1/3 Price Scan Range; Volatility down the Scan Range |
7 |
$4,000 |
($2,100) |
$1,900 |
Price up 2/3 Price Scan Range; Volatility up the Scan Range |
8 |
$4,000 |
($2,330) |
$1,670 |
Price up 2/3 Price Scan Range; Volatility down the Scan Range |
9 |
($4,000) |
$3,350 |
($650) |
Price down 2/3 Price Scan Range; Volatility up the Scan Range |
10 |
($4,000) |
$3,100 |
($900) |
Price down 2/3 Price Scan Range; Volatility down the Scan Range |
11 |
$6,000 |
($3,100) |
$2,900 |
Price up 3/3 Price Scan Range; Volatility up the Scan Range |
12 |
$6,000 |
($3,375) |
$2,625 |
Price up 3/3 Price Scan Range; Volatility down the Scan Range |
13 |
($6,000) |
$5,150 |
($850) |
Price down 3/3 Price Scan Range; Volatility up the Scan Range |
14 |
($6,000) |
$4,875 |
($1,125) |
Price down 3/3 Price Scan Range; Volatility down the Scan Range |
15 |
$5,760 |
($3,680) |
$2,080 |
Price up extreme (3 times the Price Scan Range) * 32% |
16 |
($5,760) |
$5,400 |
($360) |
Price down extreme (3 times the Price Scan Range) * 32% |
The Scan Risk charge is then added to any Intra-Commodity Spread Charges (an amount that accounts for the basis risk of futures calendar spreads) and Spot Charges (A charge that covers the increased risk of positions in deliverable instruments near expiration) and is reduced by any offset from an Inter-Commodity Spread Credit (a margin credit for offsetting positions between correlated products). This sum is then compared to the Short Option Minimum Requirement (ensures that a minimum margin is collected for portfolios containing deep-out-of-the-money options) with the greater of the two being the risk of the Combined Commodity. These calculations are performed for all Combined Commodities with the Total Margin Requirement for a portfolio equal to the sum of the risk of all Combined Commodities less any credit for risk offsets provided between the different Combined Commodities.
The software for computing SPAN margin requirements, known as PC-SPAN is made available by the CME via its website.
Futures options, as well as futures margins, are governed by the exchange through a calculation algorithm known as SPAN margining. For information on SPAN and how it works, please research the exchange web site for the CME Group, www.cmegroup.com. From their web site you can run a search for SPAN, which will take you to a wealth of information on the subject and how it works. The Standard Portfolio Analysis of Risk system is a highly sophisticated methodology that calculates performance bond requirements by analyzing the “what-ifs” of virtually any market scenario.
In general, this is how SPAN works:
SPAN evaluates overall portfolio risk by calculating the worst possible loss that a portfolio of derivative and physical instruments might reasonably incur over a specified time period (typically one trading day.) This is done by computing the gains and losses that the portfolio would incur under different market conditions. At the core of the methodology is the SPAN risk array, a set of numeric values that indicate how a particular contract will gain or lose value under various conditions. Each condition is called a risk scenario. The numeric value for each risk scenario represents the gain or loss that that particular contract will experience for a particular combination of price (or underlying price) change, volatility change, and decrease in time to expiration.
The SPAN margin files are sent to IBKR at specific intervals throughout the day by the exchange and are plugged into a SPAN margin calculator. All futures options will continue to be calculated as having risk until they are expired out of the account or are closed. The fact that they might be out-of-the-money does not matter. All scenarios must take into account what could happen in extreme market volatility, and as such the margin impact of these futures options will be considered until the option position ceases to exist. The SPAN margin requirements are compared against IBKR's pre-defined extreme market move scenarios and the greater of the two are utilized as margin requirement.
Traditional and SEP IRA owners may process a full conversion of cash or securities into a Roth IRA that has identical trading capabilities at Interactive Brokers.
An IRA Roth Conversion is a transfer of Traditional, SEP, or SIMPLE IRA assets into a Roth IRA as a rollover or conversion.
While Interactive Brokers is unable to re-designate a Traditional or SEP IRA as a Roth IRA (e.g. change the same Traditional IRA into a Roth IRA), you may still complete a Roth conversion without sending funds to another brokerage firm. See below for methods to convert your IRA funds into a Roth IRA.
Internal Full Conversion Between IB Accounts
Conversion By Rollover Deposit
Click Conversions and Recharacterizations for additional information.
The IRS permits eligible IRA owners to contribute funds to a Roth IRA from a Traditional or SEP IRA. Regardless of the conversion method used, the entire transaction is treated as a conversion. There are three (3) conversion methods available for converting into an IB Roth IRA account:
(1) Internal Full Conversion (Cash & Securities)
(2) Rollover Deposit (Cash only)
(3) Trustee-to-Trustee Transfer (Cash only)
[In Funds Management of the Traditional or SEP IRA, choose: IRA Conversion to Roth Account. Or, click Position Transfers, then select IRA Conversion - Transfer Assets to Roth Account.]
Note: Select the funding option IRA Conversion or Re-characterization in the Funding section of the account application to perform a full conversion. For step-by-step instructions, click here. See Partial IRA Conversions to perform a partial conversion.
[In Funds Management of the Roth IRA, choose the following deposit method: Cash Transfers. In the Transaction List, select Deposit Cash. In the Method List, select Check, Wire, Automated Clearing House (A.C.H.), or Direct Rollover. Choose Rollover as the IRA Deposit Type.]
Note: Selecting Rollover designates the deposit as a "conversion contribution," provided funds originate from an IRA or qualified plan. Select Cash Deposit instructions for step-by-step deposit instructions.
[In Funds Management of the Roth IRA, choose the following deposit method: Cash Transfers. In the Transaction List, select Deposit Cash. In the Method List, select Trustee-to-Trustee.]
Important Note: IB is not responsible for the tax reporting of any funds distributed from the Traditional or SEP IRA held at another firm. Customers should speak with a tax advisor before requesting an IRA distribution as withholding tax may apply. Customers must contact the other firm to ensure that the IRA distribution is appropriately designated.
The deposit of funds into the Roth IRA is treated by the IRS as a rollover contribution, regardless of the conversion method, and reported to the IRS on Form 5498. Form 5498 is available by May 31 for the prior year's contributions.
The disbursement of funds from the Traditional or SEP IRA is treated by the IRS as a distribution and reported by IB on the Form 1099-R (report of the distribution). This tax form is available by January 31 for the prior year's distributions.
For additional information on Forms 5498 and 1099-R, see US Year End Tax Forms.
Click here to return to the Retirement Account Resource page.
Disclaimer: IB does not provide tax advice. These statements are provided for information purposes only, are not intended to constitute tax advice which may be relied upon to avoid penalties under any international, federal, state, local or other tax statutes or regulations, and do not resolve any tax issues in your favor. We recommend that you consult a qualified tax adviser.