XLB, the Materials Select Sector SPDR ETF, sits in an unusual position this week — short interest remains historically elevated at nearly a quarter of the free float, yet the lending market has eased sharply from recent extremes, draining some of the squeeze pressure that defined July.
The positioning story is the most interesting angle here. Short interest runs at 23.1% of the free float — a genuinely high reading for a broad sector ETF. That number has barely moved on a weekly basis, edging up just 0.2%, but the monthly picture is different: SI has fallen roughly 9.7% over the past month, retreating from a peak that saw shares short pushing above 17 million in early July. The direction of travel is lower, but the base level remains elevated. What has changed more dramatically is borrow availability. Through early July the lending market was extremely tight — availability dropped to just 3.9% at its tightest point on the 52-week range, meaning almost every borrowable share was already lent out. That pressure has now unwound sharply. Availability recovered to 80.7%, up more than 21% on the week, suggesting new supply has entered the lending pool and the acute squeeze dynamic of mid-July has largely passed. Cost to borrow reflects the same shift — it has fallen more than 40% over the past month to a routine 0.56%, down from over 1.1% in early July. Short interest tells a still-meaningful story, but availability says the conditions for a violent squeeze no longer exist.
Options positioning adds a mild defensive tilt without flashing alarm. The put/call ratio came in at 0.65, a touch above its 20-day average of 0.64 and less than one standard deviation away — a z-score of 0.83. There is no unusual options stress here. The 52-week range on the PCR runs from 0.47 to a remarkable 8.82, which means the current reading is decidedly toward the calm end of what this ETF has experienced. The gradual drift higher in the PCR since late June — from roughly 0.59 to 0.65 — suggests a modest accumulation of hedges, but nothing that signals acute fear among holders.
On the institutional side, the recent 13F data reveals some notable flows. BNP Paribas Financial Markets added nearly 4.75 million shares in the quarter to March, becoming the second-largest disclosed holder at 5.2% of shares. Citadel Advisors added 2.5 million shares in the same period to reach a 2.1% stake. Bank of America also added 2.5 million shares. These are large, quick additions — and they sit alongside a short interest level of 23% of float, which likely reflects hedging activity from the same broker-dealer community rather than outright directional bearishness. WestEnd Advisors built a position of 2.2 million shares as recently as July 31, adding almost their entire holding in the period. Marshall Wace similarly initiated a fresh position of 2.1 million shares. The picture is one of active institutional engagement on both sides of the ledger.
The ORTEX short score has climbed to 59.3 — its highest reading in the past two weeks after briefly touching 61 on July 22. The score has oscillated in a 53–61 range for a fortnight, reflecting the back-and-forth between a declining SI base and tightening-then-loosening availability conditions. The broader macro backdrop remains relevant: a recent materials rally of around 2% followed easing inflation data and stronger Asian demand signals, while infrastructure spending tailwinds continue to underpin the sector's fundamental case. The ETF is flat on the month at $52.00, despite the short-term volatility, and closed 1.9% higher on Tuesday after a weak prior session.
The key variable to watch is whether the loosening in borrow availability is sustained or whether lending demand firms again — particularly given that short interest, though declining, remains high enough that any renewed tightening in the lending pool would meaningfully shift the squeeze calculus.
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