BTC — Grayscale's Bitcoin Mini Trust — has quietly turned the corner since last week's note, with short interest falling and the price nudging higher, even as a sharp jump in borrowing cost introduces an intriguing wrinkle.
The clearest shift from four days ago is in short positioning. Short interest has dropped 41% over the past month, now representing just 0.55% of the free float — a level so small it barely registers as a signal. The direction of travel matters more than the absolute number: shorts have been unwinding steadily, with shares short falling from around 1 million in late June to roughly 600,000 today. That's consistent with the prior note's read that whatever tactical positioning drove the mid-summer short build has continued to unwind.
The lending market tells a slightly more complicated story this week. Availability remains extraordinarily loose — at effectively 10,000% relative to shares already borrowed, there is no meaningful constraint on anyone who wants to establish or grow a short position. That reading is actually more relaxed than the 7,800% flagged in the previous note, rising around 30% on the week. What stands out, though, is the cost to borrow. It doubled in a single session on August 4, jumping from 0.48% to 0.91% — the highest reading since early July, when a brief spike took it above 3.7% before collapsing. The current level is still low in absolute terms, but the pace of the move is worth watching. Availability remains ample, so this doesn't signal a genuine borrow squeeze; it's more likely a function of short-dated transactional demand or liquidity timing in the lending pool.
Options positioning is notably calm. The put/call ratio is running at 0.28, fractionally below its 20-day average of 0.28 — essentially flat and showing none of the defensiveness that would accompany genuine bearish conviction. With the PCR z-score barely negative at -0.36, options traders are neither hedging aggressively nor reaching for upside calls. The 52-week range on the PCR stretches from 0.23 to 0.46, and the current reading sits near the lower end — implying a mildly bullish tilt in the options market that has been consistent for several weeks. The ORTEX short score of 26.1 is low and drifting slightly lower, corroborating the picture of modest and diminishing short interest pressure.
On price, BTC closed at $28.40 on August 4, up 0.6% on the day and 0.6% on the week. The monthly gain of 4.5% marks a cleaner recovery than the mixed read in last week's note, which flagged a weekly dip despite a stronger month. That tension has resolved to the upside, at least for now, with the trust tracking Bitcoin's broader constructive tone. Valuation data for the trust is stale and not useful here — as an ETF wrapper, the relevant anchor is the underlying Bitcoin price rather than earnings-based multiples.
What to watch next is whether the cost-to-borrow spike on August 4 persists or fades as quickly as it appeared — the early-July experience, where CTB briefly touched 3.8% before collapsing back below 0.5% within days, is the relevant frame of reference.
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