Nasdaq Announces Mid-Month Open Short Interest Positions in Nasdaq Stocks as of Settlement Date September 15, 2026

Aggregate short interest across 5,516 Nasdaq securities edged down by 64.6 million shares, or 0.3%, to 22.521 billion as of September 15 from 22.586 billion at August 31. Despite the decline in shares sold short, days-to-cover increased to 2.96 from 2.86, while Nasdaq Global Market short interest fell to 18.117 billion shares and Nasdaq Capital Market short interest rose to 4.405 billion. The routine exchange-wide positioning update signals little directional change in aggregate bearish positioning.

Analysis

The marginal increase in Nasdaq-wide days-to-cover despite a small decline in aggregate shares short is a liquidity signal, not a directional equity signal: trading velocity has softened faster than short positioning. That raises the probability of sharper factor moves if a macro catalyst forces de-risking, particularly in high-beta Nasdaq constituents where borrow utilization and option-market dealer hedging can amplify gaps. The aggregate release provides no evidence that NDAQ's own earnings trajectory has changed.

Near term, treat this as a reason to tighten liquidity screens rather than chase a broad short-squeeze thesis. A sustained rise in days-to-cover over the next two reporting cycles, alongside narrowing index breadth and elevated single-stock dispersion, would favor volatility exposure and quality/low-beta leadership; a rebound in volumes would negate the mechanical squeeze setup. The relevant second-order risk is concentrated short covering in crowded AI, biotech, and small-cap technology names, which can temporarily outperform fundamentals and punish factor-neutral short books.

For NDAQ, higher market volatility and turnover are generally supportive of transaction and data demand, but the effect is too indirect and too small here to alter a fundamental position. The more actionable read-through is for liquidity-sensitive portfolios: reduced ADV increases execution costs and makes nominal short-interest statistics less informative without security-level borrow, utilization, and free-float data.

Key Decisions for Investors

• No directional trade in NDAQ based on this release alone; maintain existing thesis-driven exposure. Reassess only if subsequent volume data and volatility regimes indicate a durable pickup in exchange activity.
• For market-neutral books over the next 1-3 months, require higher minimum ADV and tighter borrow-utilization limits on Nasdaq shorts; reduce gross exposure in names with days-to-cover above 7x and limited free float.
• Establish an alert, not a trade, for two consecutive biweekly increases in Nasdaq aggregate days-to-cover combined with VXN above its 3-month median; this would support buying 1-3 month QQQ put spreads or reducing high-beta net exposure.
• Avoid broad QQQ short-squeeze positioning absent constituent-level data. Screen instead for individual names with rising short interest, rising borrow cost, positive estimate revisions, and upcoming catalysts; those are the conditions under which covering risk becomes tradable.