Utilization (Stock Lending)
// percentage of lendable inventory that is currently out on loan
Utilization is the percentage of broker-dealer lendable share inventory currently out on loan to short sellers. Tapeboard sources utilization from Interactive Brokers stock-loan inventory data.
- Daily-published, sourced from broker-dealer stock-loan books (Tapeboard uses IBKR).
- Above 90% is a hard-to-borrow regime; above 95% means the locate market is severely strained.
- Utilization complements short interest: SI is a stock count, utilization is the rate at which the borrow inventory is exhausted.
How it is calculated
Lendable inventory comes from broker-dealer customer accounts (margin agreements that authorize stock loan) plus the broker's own firm inventory. Loaned shares come out of that pool. Utilization is the ratio. Tapeboard's feed is the IBKR stock-loan book; other broker books may print different numbers.
What traders use it for
- Confirming a hard-to-borrow regime. Borrow-fee spikes with utilization above 90% are the canonical hard-to-borrow signal.
- Spotting impending forced cover. A name running at 99% utilization for several sessions has effectively no loanable supply; new short-sellers will pay the locate.
- Cross-checking squeeze setups. High SI %-of-float plus high utilization is the structural confirmation that the SI number is real and not synthetic.
Worked example
Suppose GME utilization on the IBKR feed prints 92.1% as of 2026-05-02 16:00 ET. The 30-day median utilization on GME has been 87%. The reading is in the hard-to-borrow zone. Pairing the 92.1% utilization with the 18.7% borrow fee from the same day confirms the locate market is severely strained, not just temporarily tight.
Live data: /stocks/GME.
Common pitfalls
- Single-broker view. Tapeboard's feed is IBKR; the ETrade or Schwab books can show different utilization. Cross-broker disagreement on a name is informative; one broker tight does not always mean the market is tight.
- Utilization can be near 100% on a small absolute lendable pool. A nano-cap with 50,000 lendable shares and 49,500 on loan is technically 99% utilized but the absolute size is irrelevant; combine utilization with SI %-of-float and borrow fee for context.
- New issues have unstable utilization until the borrow market matures (about 60-90 days post-IPO).
- Utilization does not distinguish customer-margin lending from firm-account lending. The two pools have different durability under stress; a single utilization number does not surface that.
Where this metric appears on Tapeboard
Utilization renders on every `/stocks/{T}` page alongside borrow fee and SI %-of-float, on the /short-squeeze-stocks/highest-borrow-fee landing, and feeds the Tapeboard squeeze score with a 20% weighting.
Tapeboard surfaces this metric as a first-class screening filter. See the comparison pages at all Bloomberg alternatives for how Tapeboard's utilization (lending) surface compares against Koyfin, Finviz, TradingView, and Unusual Whales.
Related terms
- Short Interest: FINRA short-interest reports settle bi-monthly with a publication lag of about 10 business days from the report date.
- Days To Cover: Higher DTC means a slower unwind. Above 5 days is a meaningful liquidity constraint on short covering; above 10 is severe.
- Failures-To-Deliver (FTD): Bi-monthly SEC dataset, lag of about two weeks. Counts unsettled share volume per ticker per day.
- Squeeze Score: Five-input composite: SI %-of-float (35%), borrow fee (25%), float utilization (20%), days to cover (15%), 5-day momentum (5%). Weights last calibrated 2024-11-15.
Primary sources cited
- FINRA short-sale rules and Reg SHO: Stock-loan and locate requirements are governed by FINRA short-sale rules and SEC Reg SHO. https://www.finra.org/rules-guidance/key-topics/short-sale, retrieved 2026-05-04.
Methodology last reviewed 2026-05-04 by Marcus Reilly, Editor at Tapeboard. Every claim on this page has a row in the citation registry. Glossary terms reverify on the Jan 15 / Apr 15 / Jul 15 / Oct 15 cron and any time the underlying primary-source publishes a methodology change. See methodology for the full fact-check process and corrections for the public correction log.
Disclaimer. This page is for educational and informational purposes only. Nothing on Tapeboard is investment advice. See the full risk disclaimer.