F/m Ultrashort Treasury Inflati (RBIL) — Cost to Borrow & Stock Loan Fee
Latest borrow fee for RBIL: 57.12% per year (as of Jul 13, 2026 11:52 AM ET) . Shortable shares available: 60,000.
Over the last window (Jun 15, 2026 – Jul 13, 2026) , borrow fees ranged from 31.25% to 82.49%, averaging 61.96% across 1,319 samples.
Frequently asked questions
What is the cost to borrow RBIL?
The latest borrow fee for RBIL is 57.12% 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.