Concentration margin, also known as Singleton Concentrated Margin, is IBKR's method of calculating margin requirements for accounts with portfolios concentrated in 3 or fewer stocks and their derivatives. This approach is designed to manage risk associated with concentrated positions and protect both the investor and the broker from potential significant losses due to high exposure to individual stocks.
How Concentration Margin Works:
- Identification: The system identifies the top concentrated positions and their derivatives in an account.
- Calculation: IBKR calculates the aggregate projected loss of these concentrated stocks and their derivatives using stress tests.
- Comparison: The calculated Concentration Margin is compared to the standard Reg T or Portfolio Margin requirement (also referred to as the aggregate Risk/Portfolio Margin requirement).
- Margin Requirement: The greater of the two values (Concentration Margin or standard margin requirement) becomes the new margin requirement for all open positions in the account.
Effects on Your Account:
- Increased Margin Requirements: Concentration margin can significantly increase margin requirements, potentially up to 100% for concentrated stocks.
- Reduced Buying Power: As a result of increased Initial margin requirements, your account's buying power may be severely limited despite having excess liquidity.
- Impact on Excess Liquidity: Concentration Margin can cause a substantial drop in excess liquidity due to higher Maintenance margin requirements.
- Diversification Benefits: As an account becomes more diversified, the margin requirements may decrease, potentially increasing portfolio leverage.
Key Points to Remember:
- Concentration margin applies to all margin account types.
- It considers the projected loss from three or fewer equity positions and their derivatives.
- This approach helps account for Event Risk in portfolios with highly concentrated positions.
- The initial margin requirement for concentrated stocks can be up to 100%.
- To potentially increase portfolio leverage, consider creating a more diversified portfolio.
To check if Concentration Margin is being applied to your account, review your account status or margin requirements summary in the trading platform. As you diversify your account, margin requirements for concentrated positions may decrease, potentially improving your account's overall margin situation.