Why this matters: Short interest in XLI has hit 17.3% of free float — its highest level in the 30-day data window — up 20.5% in a single week. But the borrow market has begun to loosen from its extremes. And options traders are doing something striking: they are buying calls at the fastest pace in 52 weeks.
The SI build in XLI has been relentless. Four weeks ago, 18.7 million shares were short. That figure now stands at 26.2 million — a 32% increase over 30 days.
At 17.3% of free float, this is not a marginal position. Short sellers have continued adding even as the borrow market tightened to near-record levels.
The ORTEX short score sits at 70.9 — its highest in the 10-day tracked window and up from 68.1 two weeks ago. That confirms the directional pressure is still building, not plateauing.
Previous ORTEX notes flagged availability collapsing to its 52-week floor of 1.3% on September 21. That was the critical breaking point. Since then, conditions have shifted.
Availability has recovered to 56.7% as of September 25. That is still far from the 250%+ levels seen in mid-August, but it marks a meaningful bounce off the floor. For context: availability was 8.3% just three days prior.
Cost to borrow tells the same story in reverse. It spiked to 1.44% on September 22, then pulled back to 0.84% by September 25. The pressure eased once availability stopped contracting.
The lending market is no longer at an emergency reading. It remains tighter than normal — availability under 100% means roughly one share remains available for every share already borrowed — but the structural exhaustion of the prior week has partly resolved.
This is the wrinkle. While short sellers have been piling in, options positioning has moved sharply in the opposite direction.
The put/call ratio dropped to 1.47 on September 23 — the lowest in 52 weeks — before ticking back to 1.89 by September 25. The 20-day mean PCR stands at 2.26. That means call buying has been running at a pace more than two standard deviations below the typical put-heavy norm for this ETF.
For an ETF that typically trades with heavy put protection, a 52-week low PCR during a week when short interest is surging is a notable divergence. Options traders are not positioning defensively. They are buying calls.
The two-sided tension — a 30-day SI build running alongside a 52-week-low PCR — is the defining feature of this setup. Watch whether the borrow market tightens again as the marginal relief fades.
See the live data behind this article on ORTEX.
Open XLI on ORTEX →ORTEX Market Intelligence content is generated by AI from a snapshot of ORTEX's proprietary data. Content is informational only and does not constitute investment advice.
