One One S&P 500 and Bitcoin ETF (OOSB) — Cost to Borrow & Stock Loan Fee
Latest borrow fee for OOSB: 9.50% per year (as of Apr 13, 2026 8:02 AM ET) . Shortable shares available: 0.
Frequently asked questions
What is the cost to borrow OOSB?
The latest borrow fee for OOSB is 9.50% per year, sourced from IBKR.
Why does borrow fee change?
Borrow fees rise when fewer shares are available to lend and fall when supply grows. Low-float, high-interest names often show sharp intraday fee spikes.
How often is CTB updated?
finshort polls IBKR throughout each trading session. Borrow fees and shortable share counts are refreshed every few minutes during market hours.