Educational only, not tax, legal, or financial advice. Rules vary by broker and situation — verify specifics with your broker or a professional.
A hard-to-borrow (HTB) stock is one that’s difficult or expensive to borrow for short selling — which raises short-selling costs and can drive early option exercise. It’s mostly a single-stock phenomenon.
What it means
To short a stock, you must borrow shares. When shares are scarce (high short interest, limited float), they become “hard to borrow” — brokers charge a borrow fee, sometimes steep. This makes shorting costly and can cause short squeezes. It’s common in heavily-shorted small caps and meme stocks, and essentially never an issue for a mega-liquid ETF like SPY.
Why it affects options
HTB status ripples into options: put prices can behave oddly (elevated), put-call parity can appear “broken” because of borrow costs, and deep-ITM call holders may exercise early to effectively get short exposure — creating assignment for sellers. Options traders on HTB names have to account for the borrow.
Hard-to-borrow means shorting is scarce and pricey — and that scarcity distorts the options on that stock. Not a SPY problem; very much a meme-stock one.
What it means for a scalper
For SPY 0DTE, HTB is irrelevant — SPY is trivially easy to borrow and trade. It matters if you trade options on heavily-shorted single stocks, where borrow costs and squeeze dynamics distort pricing. Know the term; it’s a single-stock consideration, not an index one.