SPY closes the week of July 20 in an awkward middle ground: short sellers who rebuilt positions on the Iran escalation are neither adding nor covering meaningfully, while options traders have nudged back toward defensive territory after briefly relaxing earlier in the week.
The short interest picture has barely moved from where last Sunday's report left it. Shares short ended Tuesday at 109.2 million — 10.6% of the free float — almost exactly flat with the July 13–14 range and well above the early-July trough near 102 million. The month-long trend is a slow grind higher: SI is up roughly 1% versus 30 days ago, a far cry from the sharp rebuild seen when Iran headlines first broke, but also clearly not reversing. The Iran-driven caution has settled into the furniture rather than fading away.
The borrow market, however, tells a different story. Availability has tightened sharply this week — from 2,049% last Thursday to 1,047% on Tuesday — cutting the lending pool roughly in half in four sessions. That's still a loose market by any reasonable standard; there are roughly ten shares available for every one currently lent out. Cost to borrow has also fallen, dropping 29% on the week to just 0.21%, its lowest reading in the 30-day window. The divergence is worth noting: availability tightened while borrowing costs fell, which typically points to a mechanical shift in the lending pool rather than renewed short-selling pressure. The borrow market is not flashing stress.
Options positioning has moved the other way from what earlier in the week suggested. The put/call ratio closed Tuesday at 1.84 — above its 20-day average of 1.79, though only about half a standard deviation above it. That's a modest defensive lean, not an alarm. Context matters here: the PCR has been elevated for much of the past six weeks, rarely dipping below 1.70 since late June. The 52-week range runs from 1.27 to 2.40, putting today's reading squarely in the middle. The brief spike above 2.00 seen on June 30 and again around July 14 has faded, but the baseline level of put demand remains higher than it was through most of the first half. Investors are still paying for downside protection; they're just not panicking.
The ORTEX short score has drifted modestly higher, reaching 48.1 on Tuesday versus 46.1 a week ago. That puts it just below the neutral midpoint of the 0–100 range and well below the 50.7 reading hit on July 13 at the peak of Iran-driven concern. The score's recent range — roughly 46 to 51 — reflects a market that's cautious without being heavily positioned for a decline. Morgan Stanley added 11.1 million shares in Q1, the biggest institutional move in the top-15 holder list, while Wells Fargo trimmed 11.6 million. Neither move shifts the overall ownership picture materially, but it does suggest some rotation among major holders even as the index itself barely moved on a monthly basis.
What to watch: whether the put/call ratio sustains above 1.80 into next week, and whether the tightening in borrow availability accelerates or reverses — the divergence between pool size and borrowing cost will clarify whether the week's lending shift was structural or temporary.
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