The short-selling trend that was quietly developing in EWJ a week ago has moved up a gear — short interest has jumped another 17% over the past week alone, even as the Japan ETF itself barely moved.
The short build is now the defining story in this name. Short interest has nearly doubled over the past month, up 88% to 3.8% of the free float, with 7.3 million shares now short. That weekly 17% rise follows a 13% single-day spike on September 1 — the sharpest one-day move in the 30-day window. To put the scale in context: as recently as early August, short interest was sitting closer to 3.3 million shares. Bears have more than doubled their exposure in under four weeks, and the pace is quickening rather than levelling off. The ORTEX short score has followed, climbing to 37 from 32.6 on August 21 — not extreme, but the direction is consistent.
The lending market, however, is offering those shorts an easy ride. Borrow availability has tightened sharply from the loose conditions of last week — dropping from around 1,160% to 635% — but that still means there are more than six shares available to borrow for every one already shorted. That's well within normal territory for a large, liquid ETF. Cost to borrow is running at just 0.81%, a level that imposes almost no carry cost on a bear position. The squeeze conditions simply do not exist here: the short build is a deliberate strategic lean, not a crowded trade being forced into a tight borrow.
Options positioning reinforces the cautious tilt. The put/call ratio is running at 1.67, above its 20-day average of 1.54 — a reading skewed toward hedging and downside protection, though the z-score of 0.84 puts this well within one standard deviation. It's a mild defensive lean rather than an extreme signal. The 52-week high on the PCR is 3.19, which frames the current reading as elevated-but-not-stretched.
The institutional ownership picture adds context. BlackRock's portfolio management arm filed a 13G/A in early June disclosing an increase to 11.5% from 8.8% — a meaningful step-up in passive anchor ownership. BlackRock as institutional holder separately holds 12.5% of shares, making the combined BlackRock family of entities the dominant force on the register. JPMorgan holds another 11.1%, and Morgan Stanley 9.6%. The top three holders alone account for roughly a third of the ETF. This is a fund where the register is heavily concentrated in large financial institutions, and the short build is happening around the edges of that ownership base.
EWJ itself has drifted lower this week — down 0.4% — after a stronger month that added just over 3%. The previous note flagged the contradiction of a rising ETF alongside a rebuilding short book; that contradiction hasn't resolved. What to watch now is whether the short build rate continues to accelerate into September, and whether borrow availability tightens further — any meaningful move below 200% would signal a more competitive scramble for borrows and change the character of the trade.
See the live data behind this article on ORTEX.
Open EWJ on ORTEX →ORTEX Market Intelligence content is generated by AI from a snapshot of ORTEX's proprietary data. Content is informational only and does not constitute investment advice.
