XHB shorts hit record high as borrow dries up

Short sellers are piling into the SPDR S&P Homebuilders ETF at a record pace. Short interest has reached 45.4% of free float, the highest level on record for XHB, and the lending market is now severely constrained.

Borrow market at breaking point

Availability has fallen to 28.4%, meaning only about one share remains available to borrow for every three already lent out. That is a dramatic tightening from just a week ago, when availability stood at 172.7% after a brief loosening on 30 October. Two sessions of maxed-out lending have driven the pool close to empty.

Cost to borrow has moved in lockstep. It rose 71% over the past week to 2.35%. That is not yet at the levels seen in early October, when CTB briefly touched 4.07%, but the direction is clear and the available supply to absorb further demand is thin.

The 52-week low for availability on this ETF is 0.71%. The lending market has been here before. When availability last approached zero, on 26 to 27 October, it snapped back sharply within days as ETF creation mechanics replenished the lending pool. Whether that happens again depends on whether authorized participants step in to create new shares.

Short interest at a record

SI has climbed roughly 17% over the past month to reach 45.4% of float. The move since 23 October is particularly sharp: from 5.97 million shares short to 6.97 million, a gain of around one million shares in eight trading sessions.

FINRA's fortnightly official count, as of the 15 October settlement date, stood at 6.86 million shares with days-to-cover at 3.37. The ORTEX daily estimate has since moved above that figure, suggesting the official count will confirm further building when it next updates.

The ORTEX short score sits at 71.9, near the top of its recent range.

Options confirm the bearish lean

The put-to-call ratio is 1.52, in line with its 20-day average of 1.54. That is unremarkable on its own, but the sustained elevation, the PCR has not dipped below 1.21 in the past three weeks, confirms that options traders have maintained consistent downside protection throughout the short interest build. The PCR 52-week high is 1.82; the current reading sits comfortably in the upper half of the annual range.

What to watch

ETF mechanics can reset the borrow market quickly. A large creation event would replenish available shares and could force a rapid unwind of marginal short positions carrying rising borrow costs. With availability at 28.4% and CTB rising, the pressure on shorts is building even as the thesis, rate-sensitive housing demand, deteriorating affordability, remains intact.

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• SI % of Free Float: 45.4% (record high)
• Availability: 28.4% (down from 172.7% one week prior)
• Cost to borrow: 2.35%, up 71% week-on-week
• Put-call ratio: 1.52 (20-day mean: 1.54)
• ORTEX short score: 71.9
• Shares short (ORTEX estimate): 6.97 million as of 3 November