Borrowing against securities exposes investors to forced liquidation risk, with neither margin loans nor securities-based credit lines guaranteeing a window to act before lenders sell collateral. A key distinction exists between the two instruments: securities-based credit lines cannot fund additional securities purchases, while margin loans can, creating different risk profiles for borrowers. When collateral values decline sharply, lenders may execute forced sales without providing borrowers adequate time to post additional margin or close positions. This mechanism has led to significant losses for investors who assumed they would receive warnings or grace periods before their pledged shares were liquidated.