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February 2013
EXANTE
CROSS-ASSET PORTFOLIO MARGIN
RISK CALCULATION for HFT
Sergey Troshin, PhD,
Tech lead, Trading Platform
Contents
2
1. Broker for algorithmic traders
Internal architecture overview
2. Current risk scheme and its drawbacks
Problems by design. Implementation problems.
3. Risk calculation and control proposal
Cross-asset portfolio margin risk management in
near real time mode.
EXANTE platform
3
• One client account for all products
• Trading terminal for Win, Mac, Unix
• FIX connection
4
Presence in all major financial centres
• 50+ Exchanges
• 100K+ Instruments
5
• 10+ data vendor gateways
• 10+ execution gateways
6
Parallel trading via many Gateways
using one Account
=> Accurate risk control is needed
Current Risks
7
Initial startup
After each trade
Current Risks
8
Current Risks
9
Pros:
• Simple and extremely fast Gateway
Cons:
• Limits update are not fast enough because of
heavy calculations on Back Office side
• Orders data are encapsulated in Gateway
• Portfolio Margin is not calculated
• High BO=>RA traffic (symbols * accounts)
• Gateway restart takes significant time
• Possible inaccurate limits
Risks Requirements
10
• 100K symbols and 10K accounts
• Fast risk calculation, updates and checks
• Use orders data in risk processing
• Portfolio margin calculation
• Reasonable traffic (symbols + accounts)
Risks Proposal
11
SymbolLimit = FreeMoney * LeverageRate *
CrossCourse / Price
Definitions
• MarginCoefficient = CrossCourse / Price
(initial margin to open position with quantity
set to 1 and leverage rate set as 1)
Facts
• Margin Coefficient doesn’t depend on
account
• LeverageRate is the same for many accounts
• CrossCourse and Price can not change
Initial startup
Trade processing
Risks Proposal
12
Free Money
13
Account Margin =
SUM(Asset Margin) +
SUM(Cross-Asset Margin)
Asset Margin =
Quantity *
LeverageRate *
MarginCoefficient
Cross-Asset Margin = SPAN-like algorithm
for same underlying
Improvements
14
1. Move free money calculation to Risk Agent.
Orders synchronization is needed.
2. Compute free money using cross margining
info
3. Use margin data in ATP
Proposed risks
15
Pros:
• Gateway is still very fast(<1ms)
• Orders are used in limits calculation
• Portfolio Margin can be calculated in different
ways
• Cross margin data could be used
• All limits and leverage rates could be
overridden
• Fast as light risk updates
• Backup gateways
Cons:
16
Questions?
Sergey Troshin, PhD, Tech Lead (st@exante.eu)
www.exante.eu

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EXANTE Cross-Asset Portfolio Margin Risk Calculation for Hedge Funds Trading

  • 1. February 2013 EXANTE CROSS-ASSET PORTFOLIO MARGIN RISK CALCULATION for HFT Sergey Troshin, PhD, Tech lead, Trading Platform
  • 2. Contents 2 1. Broker for algorithmic traders Internal architecture overview 2. Current risk scheme and its drawbacks Problems by design. Implementation problems. 3. Risk calculation and control proposal Cross-asset portfolio margin risk management in near real time mode.
  • 3. EXANTE platform 3 • One client account for all products • Trading terminal for Win, Mac, Unix • FIX connection
  • 4. 4 Presence in all major financial centres • 50+ Exchanges • 100K+ Instruments
  • 5. 5 • 10+ data vendor gateways • 10+ execution gateways
  • 6. 6 Parallel trading via many Gateways using one Account => Accurate risk control is needed
  • 8. Initial startup After each trade Current Risks 8
  • 9. Current Risks 9 Pros: • Simple and extremely fast Gateway Cons: • Limits update are not fast enough because of heavy calculations on Back Office side • Orders data are encapsulated in Gateway • Portfolio Margin is not calculated • High BO=>RA traffic (symbols * accounts) • Gateway restart takes significant time • Possible inaccurate limits
  • 10. Risks Requirements 10 • 100K symbols and 10K accounts • Fast risk calculation, updates and checks • Use orders data in risk processing • Portfolio margin calculation • Reasonable traffic (symbols + accounts)
  • 11. Risks Proposal 11 SymbolLimit = FreeMoney * LeverageRate * CrossCourse / Price Definitions • MarginCoefficient = CrossCourse / Price (initial margin to open position with quantity set to 1 and leverage rate set as 1) Facts • Margin Coefficient doesn’t depend on account • LeverageRate is the same for many accounts • CrossCourse and Price can not change
  • 13. Free Money 13 Account Margin = SUM(Asset Margin) + SUM(Cross-Asset Margin) Asset Margin = Quantity * LeverageRate * MarginCoefficient Cross-Asset Margin = SPAN-like algorithm for same underlying
  • 14. Improvements 14 1. Move free money calculation to Risk Agent. Orders synchronization is needed. 2. Compute free money using cross margining info 3. Use margin data in ATP
  • 15. Proposed risks 15 Pros: • Gateway is still very fast(<1ms) • Orders are used in limits calculation • Portfolio Margin can be calculated in different ways • Cross margin data could be used • All limits and leverage rates could be overridden • Fast as light risk updates • Backup gateways Cons:
  • 16. 16 Questions? Sergey Troshin, PhD, Tech Lead (st@exante.eu) www.exante.eu