SOXX shorts triple as semiconductor ETF drops 71% in a week

Short sellers piled into the iShares Semiconductor ETF at an extraordinary pace last week. Short interest hit 74.7% of float on November 5, up 187% in a single day, as the ETF fell 71% over the week to close at $136.53.

A short position that dwarfs anything recent

The week-on-week change in short interest is 19.2 standard deviations above SOXX's typical weekly move over the past year. To put the scale in context: short interest sat between 10.9 million and 14.9 million shares throughout October. By November 5 it had jumped to 42 million shares. That is a tripling of the short book in roughly 48 hours.

The ORTEX short score reached 70.2 on November 5, up from 63.4 on October 23. That is the highest reading in at least a month and places the ETF firmly in elevated-short-pressure territory.

Options told two stories in three days

The options market swung sharply. On November 4, the put-call ratio dropped to 1.28, nearly 2.3 standard deviations below its 20-day mean of 1.79, as the ETF rallied 2.5%. By November 6, the ratio spiked to 4.14, close to the 52-week high of 4.28, and nearly 4 standard deviations above its mean. The most recent reading, as of November 6, has since pulled back to 1.619, slightly below its 20-day mean of 1.90.

The sequence points to rapid repositioning rather than a steady directional bet. Call buyers moved in on the bounce, then protective put demand surged as the ETF continued lower.

Lending market tells a different story than the shorts

Despite the sharp rise in short interest, the borrow market remains relatively open. Availability stands at 161%, meaning borrowable shares still on the shelf amount to roughly 1.6 times the shares already borrowed. That is well above the 52-week low of 4.3%. Cost to borrow was 0.49% as of November 5, down more than a third over the past week. Cheap borrow and ample supply suggest the surge in short positions was not constrained by lending conditions.

Retail attention spikes alongside the positioning shift

ORTEX Alt Data shows retail attention, measured as the combined z-score of English Wikipedia article views and ORTEX page traffic on a log scale over the prior 90 days, running 2.68 standard deviations above its own 90-day average as of November 6. The ETF's moves have drawn a sharp rise in public interest.

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• Short interest: 74.7% of float as of November 5, up 187% in one day and 209% over one month
• Short score: 70.2 (November 5), highest in at least a month
• Options PCR: swung from 1.28 (November 4) to 4.14 (November 5) before settling at 1.619 (November 6)
• Availability: 161% as of November 5; cost to borrow at 0.49%, falling
• Retail attention: 2.68 standard deviations above 90-day average (November 6)
• Price: $136.53, down 71% over the past week