URNM Shorts Triple as Uranium ETF Slips

URNM, the Sprott Uranium Miners ETF, heads into the final week of June with a striking divergence: short interest has tripled over the past month even as the borrow market remains unusually loose.

The most arresting feature of this week's data is that surge in short positioning. Short interest has climbed more than 200% over the past month, reaching 4.47% of free float — roughly 1.38 million shares as of June 23. That's a dramatic build from the sub-500,000-share levels seen in mid-to-late May. Yet the week-on-week picture is more nuanced. Shorts actually trimmed slightly, down about 8% from a recent peak of 1.5 million shares hit earlier in the month. The monthly build looks aggressive. The weekly retreat suggests some of that positioning may already be unwinding.

Despite all that short-interest activity, the lending market is nowhere close to stressed. Availability is at roughly 406% — meaning there are more than four times as many shares available to borrow as there are shares currently shorted. That compares to a 52-week low availability of around 147%, and is well above the tighter readings seen in mid-June when availability compressed toward the 340% range. Borrowing costs reinforce the picture: cost to borrow has eased to around 0.47%, down almost 10% on the week, and remains firmly in "low" territory. Shorts face no meaningful squeeze pressure here. Any further build in positioning would be easy to execute.

Options flow tells a different story about the broader investor base — and it's notably bullish-leaning. The put/call ratio is running at just 0.10, almost two standard deviations below its 20-day average of 0.11. In an ETF where the 52-week PCR high reached 1.72, the current level sits near the lowest defensive hedging seen all year. Options traders are not bracing for downside. That contrast — shorts building materially while options participants show little interest in protection — defines the tension in URNM's current setup.

The ETF itself has softened. It closed at $55.69 on June 23, down 0.9% on the day and off 3.5% for the week. The one-month loss stands at 4.3%. That follows a brief burst of optimism noted in late May, when uranium spot prices pushed above $85/lb on AI data-center demand narratives and broader reactor buildout themes. The ORTEX short score has eased slightly to 44.2, down from near 47 earlier in the month — reflecting some cooling in short-side conviction even as the overall positioning remains elevated relative to May's baseline.

The setup worth watching is whether that three-month short-interest build holds or continues to unwind. With availability this loose and borrowing costs this low, there's no mechanical pressure forcing shorts to cover. The next signal will likely come from uranium spot prices: a move back through $85/lb would test whether the May short-covering instinct reasserts itself, or whether the new positioning has staying power.