The stalemate that defined SOXX last week has broken — but not in the direction bulls needed. Short interest has climbed, availability has cratered back toward crisis levels, and borrowing costs have doubled. The borrow market that looked "fully normalised" five days ago is anything but.
Short interest has risen 6.2% on the week to 23.3% of free float — a new high relative to the recent plateau and a clear acceleration from the 22.2% reading cited in Monday's report. The move happened in a tight window: shares short jumped from roughly 12.5 million on August 7 to 13.5 million by mid-week before settling at 13.1 million on August 13. The direction of travel is unambiguous. Shorts that looked stubborn last week are now actively adding.
The borrow market has re-tightened sharply — and the speed of the reversal is the real story. Availability collapsed from 157% last Friday to just 4.3% on August 12, the tightest reading recorded this year, before recovering partially to 19.8% on August 13. At that level, fewer than one share remains available for every five already borrowed — a genuinely tight condition. Cost to borrow has more than doubled over the week, from roughly 0.79% to 1.47%, with an intraday peak near 1.76% on August 12. That's not a squeeze, but it's no longer frictionless either. The last time availability dropped this low was July 3, when cost to borrow briefly touched 3%. The pattern is repeating: demand for borrows spikes, availability evaporates, lenders replenish, and the cycle resets — only each time, short interest is a little higher than before.
The ORTEX short score underlines this. It has climbed from 58.7 at the end of July to 67.1 now — a meaningful re-rating over two weeks that puts SOXX in firmly elevated short-conviction territory. The score has been broadly stable in the mid-60s since August 3, suggesting the rebuild is not a one-day event but a deliberate repositioning.
Options traders have moved in the opposite direction, and the contrast is worth flagging. The put/call ratio has dropped to 1.24 — its lowest reading of the past year and nearly 1.6 standard deviations below the 20-day average of 1.48. A year ago the PCR touched 3.73; even the recent average implied a more defensive posture. The current reading signals that options traders have abandoned hedges, or are actively buying calls, at precisely the moment short sellers are rebuilding positions. One camp expects a recovery; the other is paying to lean against it. The stock itself is up 1.3% on the week at $550.42 — a modest gain that has so far resolved nothing between the two camps.
The institutional picture adds one piece of context. Susquehanna added roughly 1.2 million shares in the quarter to March, and the Healthcare of Ontario Pension Plan added 640,000 shares to June 30 — both meaningful flows into an ETF where Goldman Sachs remains the largest holder at 5.5% of shares. Whether those are hedged positions or directional bets is unknowable from the data alone, but the institutional presence is substantial relative to float.
The number to watch next week is availability. If it holds above 15%, the borrow squeeze pressure is manageable and shorts can sustain their positions cheaply. If it collapses again toward the 4% level seen on August 12, cost to borrow will spike and the dynamics that briefly squeezed the ETF in early August will be back on the table — against a short base that is now larger than it was then.
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