XLB — the Materials Select Sector SPDR — has turned sharply lower this week, dropping 5.9% to $49.04, and the borrow market has moved with it: availability has collapsed to near zero, even as short sellers remain well below their April peak.
The most important development this week is in the lending market. Availability has effectively dried up — every share in the lending pool is currently lent out, with availability sitting at just 4.8%. That is the tightest the borrow market has been all year, approaching the 52-week minimum of 3.9%. The move is abrupt: availability was running above 55% as recently as Monday. New shorts face a near-empty pool, and the cost to borrow, while still modest at 0.75% APR, is up sharply from last week's low of 0.57%. That's a borrow market flashing a warning sign, even if the cost itself remains low in absolute terms.
Short interest tells a more nuanced story. The headline level — 22.7% of the free float at roughly 13.1 million shares — has barely moved on the week, up just 2.2%. That continuity masks a dramatic six-week unwind: at the tariff-panic peak in early April, short interest ran above 19 million shares. The subsequent retreat, down more than a third by mid-May, suggested organised short covering. This week's tick higher is the first meaningful pause in that unwind. With availability now nearly gone, adding meaningful new short exposure has become structurally difficult regardless of directional conviction.
Options positioning has shifted decisively bullish — and that creates a real tension with the price action. The put/call ratio has dropped to 0.56, the lowest reading of the past 52 weeks and almost 1.6 standard deviations below the 20-day average of 0.66. Through April and into early May, when the ETF was trading closer to $52, the PCR ran consistently above 0.70. The collapse in put demand this week — even as the ETF sheds nearly 6% — suggests call buyers are pressing a recovery thesis precisely as the price deteriorates. That divergence between options optimism and price weakness is the week's sharpest tension.
Institutional flows from the last quarter reporting (end-March) show some notable positioning shifts. BNP Paribas added nearly 4.7 million shares, Wells Fargo added 2.9 million, and Citadel built a fresh position of 2.5 million shares. Those were Q1 accumulation moves made when the ETF was likely trading at higher levels than today's $49.04. ING established a new position of 2 million shares in the same period. On the other side, Morgan Stanley trimmed by 362,000 shares and Goldman reduced by 502,000. The net picture from major holders is one of selective building rather than broad-based retreat — though Q1 data reflects a different price environment.
The ORTEX short score has edged up to 61.7 from 61.1 earlier in the week, its modest but consistent recent trend. It peaked at 63.4 on May 8, when short interest was also slightly elevated, and has since drifted lower. Analyst data on the fund is stale and cannot be used reliably. The analyst price target on record dates to 2008 and is not a current reference point.
What to watch: whether the borrow availability recovers from near-zero levels — or stays locked — will determine how much directional flexibility short sellers retain as the ETF tests new lows below $49.
See the live data behind this article on ORTEX.
Open XLB 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.
