The BTC Grayscale Bitcoin Mini Trust has moved into an odd holding pattern: the stock is up, the borrow market is fully relaxed, yet short interest has quietly rebuilt for the second time in a month.
The most striking development in the lending market is how completely the cost of borrowing has collapsed. After spiking to nearly 3.8% at the start of July — the highest reading in the data window — cost to borrow has fallen back to just 0.41%, essentially free money for anyone wanting to open a short. That matters because it happened at the same time availability widened back to the data ceiling, with more than 34 million shares available to borrow against fewer than 800,000 shorted. The borrow market is now about as loose as it gets for this trust.
Against that backdrop, short interest has crept higher — which is the tension worth watching. Shorts rose 40% in a single session on July 14, taking the position back to around 799,000 shares, or 0.73% of the free float. A month ago, the reading was roughly 430,000 shares; it has since doubled, dropped sharply into the July 8 note, and is now rebuilding again. At under 1% of float the absolute level is small, and with availability this wide there is no squeeze pressure whatsoever. But the pattern of shorts rebuilding into a rising stock — the trust is up 3.7% on the day and 1.2% on the week to $28.55 — echoes the dynamic from two weeks ago. Last time, the rebuild reversed quickly. Whether this round is profit-taking cover or fresh positioning is the question the data cannot yet answer.
Options traders remain unmoved by the short-side noise. The put/call ratio is running at 0.31, almost exactly in line with its 20-day average and well below the mid-year high near 0.46. Call demand continues to dominate the options market, consistent with the bullish tilt noted in the July 8 piece. The ORTEX short score ticked up modestly to 27.3 — marginally above where it sat through most of last week — but this remains a low reading that reflects thin short positioning rather than any genuine bearish conviction.
The setup is straightforward to monitor: the borrow cost spike that briefly hit the lending market in early July has fully unwound, and with availability this deep, any further short interest rebuild is more likely to reflect directional noise than a coordinated bear thesis. The next data point worth tracking is whether Monday's single-session 40% jump in shorts stabilises or reverses through the balance of the week.
See the live data behind this article on ORTEX.
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