XLB enters the second week of July with the short story intensifying on both dimensions: the position is bigger than it has been all year, and the borrow market has snapped tight again after last week's brief loosening.
The short rebuild that this note flagged on July 1 has continued without pause. Short interest now stands at 28.9% of free float — roughly 16.6 million shares — up 12.8% in a single week and 31.4% over the past 30 days. That is a new high for the period covered by the history here, and it reverses any hope that the early-July stabilisation was the start of a sustained retreat. A week ago this note described availability opening up to around 71.6% as the fresh shorts found easier access to borrow. That window has closed hard: availability has dropped to just 19.5%, down 72.8% on the week. On July 6, availability hit 11.4% — effectively fully utilised, the tightest single-day reading in this 30-day window. The cost to borrow has risen roughly 49% on the week to 0.875%, still technically low in absolute terms but at its highest point in a month. The direction of travel in the lending market is unambiguous: shorts are crowding in, and the pool is draining.
The 52-week availability low on record is 3.9% — well below current levels, but the trajectory this week points toward that zone. Each time availability has dipped into the teens over this period (June 12 at 12.7%, June 3–4 near 18–19%, and now), the stock has been under short pressure. The current level sits materially below the 50% threshold that marks a tight-borrow condition.
Options positioning does not corroborate the bearish short story. The put/call ratio is running slightly below its 20-day average, at 0.60 against a mean of 0.64 — a mild call-skew that has persisted since late June, when the PCR dropped from the 0.70-0.74 range it occupied through most of May and early June. The z-score of -0.71 confirms the current reading is not statistically extreme, but the direction since mid-June has been a gradual shift away from hedging and toward calls. That leaves short interest and options pulling in opposite directions: shorts are at a monthly high, but options traders are not bidding for downside protection at the same rate.
The institutional picture adds one more wrinkle. Among the top 15 reported holders, BNP Paribas added nearly 4.7 million shares, Wells Fargo added 2.9 million, Bank of America added 2.5 million, and Citadel built a new position of similar size — all as of the March quarter-end. Marshall Wace reported a fresh position of 2.1 million shares. These are not small adjustments. The aggregate institutional buying into Q1 is running in the same direction as the options market — constructive — while short sellers are taking the opposite view with increasing conviction in Q2 and into July.
The ORTEX short score has edged up to 63.8 this week, its highest in the 10-day history shown, consistent with the building short position and tightening borrow. What to watch next is whether availability continues its descent toward the June 12 low near 12.7%, and whether the call-skew in options holds as the ETF tests the upper end of its recent $50–52 range — those two signals together will tell the fuller story of whether the current short rebuild has staying power.
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