SOXL Short Interest Spikes 49% in a Day as Borrow Market Tightens Again

SOXL shorts are back. One day after availability appeared to stabilise, short interest jumped 49% in a single session. The borrow market is tightening again — and cost to borrow has tripled since the start of June.

The Position Build

Short interest hit 14.3 million shares on June 24. That is 4.2% of free float — the highest reading since early June. The one-week change is +57.5%.

This reverses the partial cover seen on June 22–23. The previous ORTEX note recorded short interest falling to 2.8% of float as availability snapped back. That reprieve lasted roughly 24 hours.

The move suggests new short positions were opened — not simply old ones held through a volatile session.

Borrow Costs Keep Climbing

Cost to borrow stood at 1.46% on June 3. It is now 4.95%. That is a 242% rise in one month.

The weekly change is +26%. Shorts entering now pay meaningfully more than those who established positions in May.

Despite that, demand has clearly returned. When borrow costs rise alongside short interest, it signals genuine conviction — not passive roll.

Availability: Tight but Off the Floor

Availability sits at 41.5% as of June 24. That is tight — roughly two shares available for every three already borrowed.

It is, however, a significant improvement from the 0.17% reading on June 19, when the lending pool was essentially exhausted. The 52-week low is 0.10%. The pool has refilled somewhat but remains stressed by historical standards.

The pattern through June has been consistent: availability collapses as the ETF rallies, then partially recovers as shorts cover. With SOXL up 20.5% over the past month, the latest build tracks that same dynamic.

Options Lean Defensive

The put-call ratio is 1.45 — near its 52-week high of 1.47. The 20-day mean is 1.37. Options positioning skews bearish, consistent with the renewed short interest build.

The PCR z-score is 1.17 — elevated but not extreme.

What to Watch

Three signals now point in the same direction: rising short interest, tightening availability, and climbing borrow costs. The ORTEX short score is 61, down slightly from a recent peak of 64.9 on June 10 — still firmly in elevated territory.

Availability below 41% with a CTB above 4.9% means the cost of maintaining bearish exposure is real. Watch whether shorts hold through the end of the week or availability tightens again toward the lows seen mid-June.

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• SI % of Free Float: 4.2% (Jun 24), up from 2.8% two days prior
• SI 1-day change: +49%
• SI 1-week change: +57.5%
• Cost to borrow: 4.95%, up 242% over one month
• Availability: 41.5% (tight); 52-week low: 0.10%
• Put-call ratio: 1.45, near 52-week high of 1.47
• ORTEX short score: 61.0 (Jun 23)
• Price: $229.57, down 0.8% on the day; +20.5% over one month