We may reduce the collateral value of securities (reduces marginability) for a variety of reasons, including:
- small market capitalization or small issue size
- low liquidity in the collective primary/secondary exchanges
- involvement in tenders and other corporate actions
To see if a stock has a special margin requirement, use the Check Margin Impact feature in TWS to see the projected margin impact.
Please feel free to visit the IBKR Knowledge Base for information regarding margin rules for stocks below USD 5 and margin treatment for foreign stocks carried by a US broker.