ASX Short Selling: Uranium Bears Dig in While Lithium Shorts Retreat

One stock on the ASX is carrying nearly 20% of its issued shares sold short, and that position has been building for a month. That is not noise. That is a thesis.

ASIC-reported short position data published 15 June 2026 captures institutional positioning as at 5 June 2026, reflecting the standard T+4 reporting lag. The week to 5 June was defined less by dramatic pivots and more by entrenchment and selective covering: uranium bears dug in, tech and healthcare shorts built quietly, and lithium and copper names saw tactical relief. For Australian investors tracking ASX short selling activity, this data is a live read on where institutional conviction is concentrated, and where positioning risk is accumulating on both the downside and the squeeze side.

What follows unpacks the most heavily shorted names, where fresh bearish interest arrived this week, where short sellers are taking profits or reassessing, and what the sector-level picture signals about institutional risk appetite heading into mid-June 2026.

Uranium leads the most-shorted list, with tech and healthcare close behind

Lotus Resources (LOT) sits at 19.94% short interest, the highest on the entire ASX. The position barely moved this week (+0.04% week-on-week) but has climbed +3.93 percentage points over the past month, a trajectory that signals entrenched institutional conviction rather than a fresh tactical bet.

Lotus Resources’ trajectory illustrates how short interest as an early warning system can work in practice: institutional sellers had already lifted LOT’s short interest to approximately 11% in the weeks before the stock fell 34% on 30 April 2026, meaning the signal was visible in the data well before the event that triggered the collapse.

ASX’s most shorted stock: Lotus Resources (LOT) at 19.94% short interest, up nearly 4 percentage points over the month, reflecting deep and sustained bearish positioning against the uranium developer.

Below the headline figure, the top-10 cohort tells several different stories simultaneously.

Reading the cohort beyond the headline numbers

LOT and BOE (13.98%, +0.72% MoM) represent the entrenched and building camp: uranium shorts that are high in absolute terms and still rising month-on-month. TLX and DMP, both at 14.80%, tell the opposite story. Their monthly declines (−0.47% and −0.75% respectively) suggest bears are gradually trimming without abandoning the thesis entirely.

Telix short positioning peaked at 16.10% in late April 2026 before the gradual monthly decline now visible in the June data, with the bear thesis persisting despite the company reporting US$804 million in FY2025 revenue, suggesting the short argument centres on valuation sustainability rather than revenue execution.

GYG, TWE, and FLT sit mid-table with broadly stable positions, representing entrenched shorts rather than actively building ones. DRO and CAR both moved up the leaderboard this week on meaningful weekly increases.

The cohort’s fastest mover is 4DMedical (4DX), whose +4.54 percentage point monthly surge into the top 10 puts it firmly on watch for either further short building or a potential squeeze into any positive newsflow.

What short selling data actually measures (and what it does not)

Short interest figures are widely referenced but frequently misread. Before interpreting the granular data that follows, three interpretive principles are worth establishing:

• Reporting lag matters. ASIC-reported short positions carry a T+4 lag. The data published 15 June 2026 reflects positions as at 5 June 2026. Week-over-week comparisons cover 1 to 5 June 2026; month-on-month comparisons span 12 May to 5 June 2026.
• High short interest cuts both ways. A heavily shorted stock concentrates both downside pressure risk and short-squeeze upside if sentiment shifts. It is not, by itself, a directional signal.
• Structural and tactical positioning are different. A stock with sustained high short interest building month-on-month reflects a structural bearish thesis. A stock with a large weekly move that diverges from its monthly trend is more likely tactical repositioning.

The ASIC short reporting framework requires all on-market short sales to be disclosed regardless of size, a more transaction-granular regime than equivalent US or UK systems, which is precisely why a T+4 lag is baked into every weekly data release and why any single week’s figures reflect positioning that is already several days old by the time it reaches the public.

The ASIC short position reporting obligations require holders of net short positions above the prescribed threshold to report daily, with publication following a T+4 lag, which is why the data released 15 June 2026 reflects positions held as at 5 June 2026 rather than the publication date itself.

The rising and covering tables that follow use a threshold of approximately 0.5 percentage points in weekly movement to identify meaningful shifts, sourced from the Market Index short selling data series (Kerry Sun, Lead Writer) based on ASIC short position reports.

Where bears are building: tech, defence, and property see fresh shorts

A valuation-risk theme connects several of the week’s largest short builds. Temple & Webster (TPW), Pro Medicus (PME), CAR Group (CAR), and 4DMedical (4DX) all trade on elevated earnings multiples, fitting the pattern of short sellers targeting high-expectation growth names where any stumble in execution could trigger sharp de-ratings.

Droneshield (DRO): bears unmoved by a contract win. Despite securing a US$24.9 million contract with the US Department of War on 2 June 2026, short interest climbed to 12.34%, approaching but not exceeding the April 2026 peak of 12.66%. The bear thesis appears focused on pipeline durability and valuation, not contract-level outcomes.

Centuria Capital (CNI) stands out as an emerging property thesis. Absolute short interest remains low at 1.91%, but the +1.48% monthly build is rapid, consistent with concerns around commercial and industrial property valuations.

Vulcan Energy Resources (VUL) is a stock-specific lithium short, distinct from the broader lithium covering trend this week. The concentrated weekly move (+0.66%) against minimal monthly change (+0.08%) suggests a recent and targeted positioning shift rather than a blanket sector call.

Where bears are retreating: lithium, copper, and pathology see covering

Not all covering tells the same story. The difference between tactical profit-taking and a genuine thesis reversal is visible in the data, and the distinction matters for investors deciding whether a relief rally has legs.

Pilbara Minerals (PLS) illustrates the point. The weekly covering of −0.59% provides near-term relief, but the monthly trend tells a different story: short interest climbed +3.79 percentage points over the month to 10.30%. Tactical and structural signals are pointing in opposite directions.

Copper-exposed names PMET Resources (PMT, −2.38% WoW) and Capstone Copper (CSC, −1.70% WoW) saw more substantial covering, consistent with the widely discussed structural copper bull thesis that makes aggressive short positioning harder to sustain. Nanosonics (NAN) represents the week’s clearest sustained unwind, down −2.73 percentage points over the month and a further −0.81% this week, directionally lower for multiple weeks.

Near-complete short exits occurred in Opthea (OPT, now 0.46%) and Mayne Pharma (MYX, now 1.49%), where weekly declines roughly matched monthly declines, confirming the bulk of bearish positioning has been unwound.

Healthcare and other sectors: profit-taking or a pivot?

Pathology names saw coordinated covering this week, but the bearish thesis remains largely intact:

• ACL: 7.17% short interest, −1.23% WoW, but +0.14% MoM, still elevated
• HLS: 8.49%, −1.08% WoW, +0.41% MoM, still the sector’s highest
• IDX: 2.33%, −0.87% WoW, −1.14% MoM, showing a more sustained decline

NAN (7.54%) remains the sector’s clearest sustained unwind, with directional declines across both timeframes.

Among other sectors, AMP (−0.87% WoW), GEM (−0.80%), and EOS (−0.61%) all saw meaningful covering with monthly trends confirming the directional move. MLX is the exception: −0.76% WoW covering sits against +0.97% MoM, indicating the weekly move was tactical profit-taking within a broader monthly build. SDR (−0.51% WoW, +0.11% MoM) shows broadly stable positioning with small tactical fluctuations.

Sector-level scorecard for the week to 5 June 2026

The preceding stock-level data resolves into a clear sector-by-sector picture. The table below summarises where institutional short-selling conviction is rising, holding, and fading across the ASX.

ASX tech and online stands out as the area of most active bearish construction this week, with multiple names building simultaneously. Property positioning is name-specific rather than sector-wide, with CNI rising while DGT and RFF ease. The contrast between uranium (entrenched, high-conviction) and lithium (tactically easing but structurally mixed) captures the week’s most interesting sectoral divergence.

The week’s most important positioning signals, stock by stock

Four names from this week’s data capture four distinct structural patterns in short selling. Recognising these patterns across any dataset allows investors to read short positioning more precisely than a simple ranking.

1. Entrenched: Lotus Resources (LOT). At 19.94% short interest with a +3.93% monthly build and just +0.04% this week, LOT reflects deep institutional commitment rather than a reactive trade. The position is the exchange’s highest and has been building for a month without a weekly spike, the signature of a structural thesis.
2. Rapidly escalating: 4DMedical (4DX). The +4.54 percentage point monthly surge is the largest in the top-10 cohort. At 11.09%, 4DX is a live candidate for both further short building and a potential squeeze into any positive newsflow.
3. Tactically divergent: Pilbara Minerals (PLS). The −0.59% weekly covering is tactical relief; the +3.79% monthly build and 10.30% absolute short interest confirm the structural bearish thesis remains intact. Tactical and structural signals are pointing in opposite directions simultaneously.
4. Conviction resistant to positive news: Droneshield (DRO). A US$24.9 million contract win on 2 June 2026 failed to deter shorts, with short interest climbing to 12.34% (just below the 12.66% April 2026 peak). Bears appear focused on pipeline durability and valuation sustainability rather than near-term contract execution.

Investors monitoring 4DMedical and Droneshield for potential covering events will find our dedicated guide to ASX short squeeze signals, which examines the specific conditions that drove Polynovo up 14.8% and Guzman Y Gomez up 20% intraday in May 2026, along with the short interest thresholds, liquidity ratios, and catalyst types that tend to precede violent covering sequences.

Signal to watch: Pilbara Minerals (PLS) saw covering this week (−0.59% WoW), but short interest climbed +3.79 percentage points over the month to 10.30%. The weekly and monthly signals are telling opposite stories.

Bears are digging in where it matters. Here is what investors should watch next.

The week to 5 June 2026 was defined by selective entrenchment coexisting with tactical de-risking, not a broad directional shift in either direction. Uranium and high-multiple tech shorts dug in; lithium, copper, and pathology shorts took profits or reassessed.

The names that warrant closest monitoring into mid-June are 4DX and LOT. Both carry the concentration of positioning where a single material development, positive or negative, is most likely to trigger either an accelerated short build or a rapid squeeze.

ASIC short position data is most valuable when read for direction and pattern rather than snapshot level. The distinction between structural conviction and tactical repositioning is the analytical lens that makes this data actionable, not the leaderboard ranking itself.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results.