Short Selling
Short selling is selling a borrowed security, hoping to buy it back cheaper — a negative inventory financed by the borrow.
Definition
Short Selling refers to a negative inventory financed by the borrow. Keep that definition fixed when comparing series, managers, or regimes — renaming the same tape does not create a new signal.
Why it matters
Price formation at the venue layer decides whether a signal survives implementation. When a negative inventory financed by the borrow shifts, related hedges, limits, and narratives usually need an explicit update rather than a quiet assumption.
Case
Suppose a desk is positioned for the opposite of what short selling is saying. If a negative inventory financed by the borrow moves against that book, the first question is not “is the story clever?” but whether size, hedges, and stop logic still match the observation.
How to read it
Measure spread, queue, and impact at your size; paper fills are not a desk edge. Prefer a short written null hypothesis for Short Selling: what would falsify the current reading in the next window?
Ask the macro AI about this object
Opens Copilot with Codex + RAG context, or send the object into Alpha Factory intake.