SPY closes the final session of Q3 at $764.20, down 1.2% on the week, as the short rebuild documented in Monday's note consolidates rather than accelerates.
The short interest story has stabilised at elevated levels. Borrowed shares ended Tuesday at 97.5 million, essentially flat from the 97.6 million peak reached last Thursday after the sharp 18% weekly jump that defined the prior note. As a share of the free float, that puts short interest at 9.5%, holding near the highest level since the covering wave of August and early September. The FINRA fortnightly settlement figure, which captures a slightly different window, came in at 99.3 million shares with 2.5 days to cover. Short sellers rebuilt aggressively last week; this week they held their ground rather than extended. The ORTEX short score is 46.1, broadly neutral and little changed over the past ten days, consistent with a market that is leaning defensive but not in a full bearish conviction mode.
Borrow conditions are no constraint on either side. Availability is at 1,380%, meaning roughly 14 shares remain available to borrow for every 10 already lent out, an extremely loose lending market. The cost to borrow has eased 14% on the week to 0.33%, well within the low band it has occupied for most of the past month. There is no squeeze pressure and no shortage of supply for anyone wanting to add or cover a short position.
Options positioning has partially normalised from the extreme call-skew that was the headline two weeks ago. The put/call ratio is back at 1.93, above the 1.89 reading from the September 19 note that marked the most call-skewed level of the year, but still about one standard deviation below its 20-day average of 2.04. The week's high PCR reading came on Monday at 2.24, a brief return to more defensive territory, before falling back. The 52-week range runs from 1.27 to 2.33, so the current reading sits in the lower half. The call-side enthusiasm that was the standout story ten days ago has faded, but options traders have not shifted back to the persistent put-buying that characterised August and the first half of September.
Institutional positioning, as of the June 30 filings, shows the usual mix of market-makers and banks at the top of the register. Jane Street added nearly 24 million shares in Q2, a substantial increase for an ETF that trades in enormous size. D.E. Shaw added 13.3 million shares, effectively doubling its position. On the other side, Morgan Stanley trimmed 8.1 million and Goldman cut 4.3 million. These are Q2 reads and carry no direct inference about where those books stand today, but the directional flow from two major market-makers in opposite directions is worth noting at quarter-end, when rebalancing flows can amplify moves.
The setup heading into Q4 is a market where short interest has rebuilt to near its late-August level, options hedging demand has eased from its September calm but has not spiked, and borrow conditions give bears no urgency to cover. The week's 1.2% price decline is the first meaningful down week in over a month. What to watch next is whether the short interest that rebuilt so quickly last week begins to extend through the first sessions of October, or whether a further price decline prompts fresh covering by traders who added at higher levels.
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