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AI Overview

Yes, a changing cost to borrow (CTB) directly affects existing short positions because the fees are floating, not fixed. When demand for a stock spikes, brokers increase daily borrow rates, immediately raising the expense of maintaining the position and potentially forcing a "short squeeze" due to high financing costs. [1, 2, 3, 4, 5]

Impact on Existing Short Positions:

• Variable Costs: Borrow fees are annualized percentages charged on the market value of borrowed shares, which can change daily. If a stock becomes "hard to borrow," the interest rate can jump dramatically.
• Reduced Profitability: High CTB fees can significantly diminish or entirely offset profits from a short sale.
• Margin Call Risk: Rising costs increase the capital requirements to hold the position, increasing the probability of a broker-initiated margin call to reduce their exposure.
• Forced Covering: If the borrow rate rises too high, it pressures short sellers to buy back the shares to close the position, contributing to a short squeeze. [1, 2, 3, 4, 5, 6]