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SPY has gained nearly 2% on the week to $779.09, yet short sellers have added to positions rather than covered, a quiet contradiction worth watching as Q4 opens.
Short interest climbed to 100.7 million borrowed shares as of October 6, equivalent to 9.8% of the free float. That is up 3.5% from last week and 9.3% from a month ago, a steady drift higher that now puts short positioning at its most extended level in the recent history captured here. The previous note documented shorts holding their ground at 97.5 million shares through the final sessions of Q3. Since then they have added roughly 3.2 million more. The FINRA fortnightly figure, settled at the September 15 date, showed 99.3 million shares short with 2.5 days to cover, consistent with the direction ORTEX estimates have tracked since. The ORTEX short score of 46.5 remains broadly neutral, ticking marginally higher through the week but well short of territory that would signal a crowded bearish conviction trade.
Borrow conditions frame that short build in context. Availability is extremely loose at 1,538%, meaning more than 15 shares remain available to lend for every 10 already borrowed. The 52-week tightest reading was 34.2%, so the market is nowhere near squeeze pressure. Cost to borrow has risen sharply in percentage terms, up 47% on the week to 0.48%, but the absolute level remains negligible for a liquid ETF of this size. The mid-September episode, when availability tightened toward the 433% to 598% range and the cost to borrow briefly touched 0.54%, was a more notable stress point. The current read is looser than that period despite the higher short count, which suggests the short build is being absorbed comfortably by the lending pool rather than creating any mechanical pressure.
Options positioning has shifted notably less defensive than it was a month ago. The put/call ratio has fallen to 1.86, nearly one standard deviation below its 20-day mean of 1.99. In September, when the ratio ran consistently above 2.0 and briefly hit 2.24 on September 28, the options market was signalling heavy hedging demand. That has eased materially even as price has recovered and short interest has climbed. The 52-week range for the PCR runs from 1.27 to 2.33, so the current reading is closer to the middle of the past year's experience, not at an extreme in either direction. The divergence between a rising short interest number and a falling put/call ratio is the central tension in the current setup: short sellers are adding to macro hedges via borrowed shares while options traders are trimming their downside protection.
The ownership register adds useful colour. Jane Street added 24 million shares through the second quarter, the largest single move among the top holders, bringing its stake to 44.3 million shares or 4.4% of the fund. D.E. Shaw also added aggressively, taking on 13.3 million shares to reach 14 million held. Both are market-making and quantitative operations whose SPY positions are likely tactical rather than directional, but the scale of their additions through Q2 reflects the ETF's continued role as the primary instrument for broad equity exposure management. On the selling side, Morgan Stanley trimmed 8.1 million shares and Goldman Sachs reduced by 4.3 million, partially offsetting the buys. All figures are as of June 30 and reflect the most recent 13F cycle.
The next meaningful data point is where short interest settles as the week of October 12 begins: whether the 100-million-share level proves a ceiling that prompts some covering into the recent price strength, or whether sellers extend through it is the question the current positioning leaves open.
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