Hard-to-Borrow (HTB)

### It is not a property of the stock, it is a property of the borrow market To sell a stock short you must deliver shares you do not own, so someone has to lend them to you. Before accepting or effecting a short sale, a broker has to borrow the security, arrange to borrow it, or have reasonable grounds to believe it can be borrowed and delivered on settlement date. That is the locate requirement of Regulation SHO Rule 203(b)(1) ([FINRA](https://www.finra.org/rules-guidance/guidance/reports/2023-finras-examination-and-risk-monitoring-program/regulation-sho)). Hard to borrow simply means locates are scarce. No locate, no short, however good your read is. FINRA also notes that in hard to borrow and threshold securities a broker-dealer may not re-apply a locate for intraday buy-to-cover trades. So in exactly the names day traders most want to fade, each new short needs a fresh locate. Locates get consumed, and they can run out mid-session. ### What it actually costs, and why penny names are worse than they look The borrow fee is quoted as an annualised rate but it accrues **daily**, on the value of the borrow, not on your trades. Interactive Brokers documents the mechanics: the loan is collateralised at 102 percent of the prior day's settlement price, rounded up to the nearest whole dollar, multiplied by the shares borrowed, and the daily charge is that value times the fee rate divided by 360 ([IBKR borrow fee details](https://www.ibkrguides.com/reportingreference/reportguide/borrowfeedetails.htm)). Read that rounding again. A stock trading at 60 cents is collateralised at a full dollar per share. IBKR itself flags that this convention matters most for low-priced and hard to borrow shares. You are paying a high rate on a value inflated above the price you actually shorted at. And the rate is not fixed at entry. It is repriced as supply and demand for the borrow moves, so the number you saw when you opened the position is not a promise about tomorrow. ### The margin bill arrives too Under FINRA Rule 4210(c), the maintenance requirement on a short is 5 dollars per share or 30 percent of current market value, whichever is greater, for stock at 5 dollars or above. For stock under 5 dollars it is 2 dollars 50 per share or 100 percent of current market value, whichever is greater ([FINRA Rule 4210](https://www.finra.org/rules-guidance/rulebooks/finra-rules/4210)). Shorting an 80 cent stock ties up 2 dollars 50 a share. The cheap stock is the expensive short. ### Recall, buy-in, and why HTB reads as squeeze risk The lender can recall the shares. You do not get a vote. Regulation SHO adds a second forced-buying channel. Under Rule 204, a clearing participant carrying a fail to deliver position has to close it out by borrowing or purchasing shares, and where the fail came from a short sale the deadline is the start of regular trading hours on the settlement day following settlement date ([17 CFR 242.204](https://www.law.cornell.edu/cfr/text/17/242.204)). Persistent fails also earn the stock a label. It becomes a threshold security once fails hit 10,000 shares or more and at least one half of one percent of shares outstanding, for five consecutive settlement days ([Nasdaq](https://www.nasdaqtrader.com/trader.aspx?id=regshothreshold)). That is the same label that stops you re-using a locate. So the HTB tag is telling you two things at once. Shorting is expensive, and there are mechanisms in the plumbing that can force buying into an already tight borrow. That is the shape of a squeeze. ### The mistake Seeing "shares available" and treating it as a green light. Availability is a snapshot. The fee is a daily bleed on an inflated value, the margin is heavier on cheap names, and the exit can be taken out of your hands.