📚 Stock Market Glossary

Clear, beginner-friendly explanations, real-world analogies, and visual formulas for key stock market terminology.

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Total 649 terms available

CTB (Cost to Borrow Fee Rate)

Trading & Market

💡 Key Takeaway: The annualized fee percentage charged by prime brokers to short sellers for borrowing shares of a specific stock.

Rental Car Surge Fee Analogy: If rental cars are completely sold out during a holiday storm, the daily rental rate surges from $50 to $1,000/day. The borrower must return the car immediately to stop hemorrhaging cash.

😎 10-Second Show-off Pro Tip for Friends!

Show-off Tip: 'Do not rely solely on short interest percentages. Track the Cost to Borrow (CTB)—when borrow rates cross 100% annualized, short sellers face crushing holding costs that trigger violent short squeezes!'

📖 Beginner-Friendly Explanation

STEP 1

Core Concept & Meaning

Cost to Borrow (CTB) is the annualized interest rate charged by prime brokers and institutional lenders to borrow shares for executing short sales.

STEP 2

Why It Matters & Key Mechanics

Highly liquid mega-cap stocks typically trade at nominal CTB rates (0.3% - 1.0%). However, when a stock becomes heavily shorted and borrowable float dries up ('Hard-to-Borrow'), CTB rates can skyrocket to 50%, 100%, or over 300%. The astronomical daily carrying cost exerts severe pressure on short sellers.

STEP 3

Practical Investment Tips & Pitfalls

A dramatic spike in CTB serves as one of the most reliable leading indicators for an impending Short Squeeze, signaling that short sellers are running out of time and financial runway.

📊 Daily Short Borrow Financing Cost

Daily Borrow Fee = (Number of Shorted Shares * Current Stock Price * Annual CTB Rate) / 360

• Holding 100k shares at $100 with a 100% CTB burns –$27,700 every single day purely in borrow financing.

⚖️ Key Comparison at a Glance

Metric	General Collateral (GC Stock)	Hard-to-Borrow (HTB Squeeze Candidate)
Annual CTB Rate	0.25% to 1.0% (Negligible financing cost)	30% to 300%+ (Crushing carrying cost)
Available Borrow Float	Abundant institutional lending supply	Exhausted borrow pools with zero availability
Short Seller Pressure	Can comfortably hold short positions for years	Suffers severe daily bleed even if stock stays flat
Short Squeeze Vulnerability	Extremely Low	Extremely High upon any unexpected buying volume catalyst

📌 Practical Market & Real-World Example

As the Cost to Borrow for a heavily shorted biotech stock surged from 15% to 140% overnight, short sellers rushed to cover positions, triggering a 65% intraday short squeeze.