Options positioning on OEF, the iShares S&P 100 ETF, has shifted sharply bullish. That shift comes even as borrow costs climb to their highest level since early June.
The put-call ratio fell to 1.70 on July 17. That is 2.27 standard deviations below the 20-day mean of 2.74. The 52-week range runs from 0.59 to 8.15. So the current reading sits in the lower half — but it is the speed of the move that stands out. As recently as July 10, the PCR sat at 3.22. Traders have rotated decisively toward calls over the past week.
Cost to borrow hit 1.74% on July 17. That is up 95% from a week earlier. It is the highest reading since early June and nearly double the sub-0.90% levels that persisted through most of late June and early July.
The lending pool, however, remains well-stocked. Availability stands at 1,818% — meaning roughly 18 shares sit available to borrow for every one already lent out. The lending market is not tight. The CTB spike reflects increased demand, not a supply squeeze.
Short interest itself is not a meaningful signal here. At 0.18% of free float, it is negligible for an ETF of this type. The week-on-week rise of 83% is large in percentage terms. In absolute terms, it amounts to fewer than 154,000 shares — a rounding error against the fund's scale.
What makes this week's activity notable is the split between two markets. The options market says call buyers are dominant — the most call-heavy positioning in at least 20 sessions. The lending market says demand to short OEF has risen sharply, with CTB nearly doubling.
These signals pull in opposite directions. One possibility: hedgers are using OEF puts as portfolio insurance while separately building short positions via the lending market. Another: different participant types are driving each market. Neither interpretation carries a clear directional conclusion.
OEF was down 1.16% on July 17 and off 1.46% for the week. The fund holds concentrated exposure to US mega-cap names.
The key question is whether the PCR drop extends further — or mean-reverts toward the 2.74 average. A continued move lower would suggest options traders are pressing their bullish view. A rebound toward 3.0+ would indicate the recent positioning was short-lived.
See the live data behind this article on ORTEX.
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