EWY is caught in a rare split-signal moment: short sellers are rebuilding aggressively into a rally that has pushed the iShares MSCI South Korea ETF up nearly 12% in seven days.
The short interest story here is the standout. Bearish positioning has climbed to 32.8% of free float — up 35% in one week and up 45% over the past month. That is a sharp rebuilding cycle. Short shares stood near 15–16 million through most of May, then broke higher from June 8 onward, reaching nearly 25 million by Tuesday. The direction is unambiguous: shorts are adding into strength, not retreating from it.
The borrow market tells a more nuanced story. Availability has tightened sharply — down to 27% from 165% just ten days ago on June 9. That is well into the "tight" range, meaning roughly one share remains available for every four already borrowed. Cost to borrow has risen 32% on the week to 1.04%, though that remains a low absolute figure. The contrast with May is instructive: through most of May, availability sat below 15% and hit a 52-week low of just 0.21%, with borrowing fully exhausted. The current tightening is moving back toward that stressed zone, and the trajectory over the past week has been steep. The ORTEX short score has edged up to 67.4 from 62.7 a week ago — a steady climb reflecting this combination of rising short interest and tightening supply.
Options positioning is less extreme than the lending market might suggest. The put/call ratio has eased to 1.77 from its 20-day average of 1.90, putting it slightly below that recent mean. The 52-week high on the PCR is 2.76, so the current reading is not near any extreme — options traders look less defensive now than they were through May and early June, even as borrow tightens. That divergence is worth noting: the lending market is flashing caution while options sentiment has turned comparatively lighter.
Institutional flows add another layer to this picture. Several large holders disclosed material new positions in the March quarter. Bank of America added 5.1 million shares to reach 8.2% of the fund. UBS Asset Management added 5.2 million shares. BNP Paribas and Susquehanna also disclosed fresh stakes. More recently, Rafferty Asset Management — the issuer of leveraged and inverse Korea ETFs — reported adding 3.3 million shares as of late May, bringing its position to 3.8% of shares. BlackRock added 1.6 million shares through May 31. Appaloosa Management, David Tepper's macro-driven hedge fund, increased by 525,000 shares to 2.4 million. The breadth of Q1 buying from both leveraged-product providers and macro funds points to hedging demand as the primary driver of short interest, rather than pure directional bearishness.
The earnings history for EWY carries one data point worth flagging. Following the May 5 announcement, the ETF gained 11.2% the next day and 9.1% over the following five sessions — essentially the rally that has defined the past six weeks. Prior reaction dates from November 2025 and November 2024 saw moves of -2.4% and -0.7% respectively on day one. The May spike was the outlier, and it appears to have drawn in short sellers who anticipate mean reversion.
The next test is whether availability continues to tighten toward the mid-May lows — and whether borrowing costs follow, which would raise the real cost for existing shorts to hold their positions.
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