3 Small-Cap Antimony Stocks Where Insiders Have Skin In The Game

Australia’s central bank just pushed interest rates to a 15-year high, putting extra pressure on indebted households and growth-focused assets. Capital is getting choosier. That can benefit niche themes tied to critical materials like antimony, especially where insiders have meaningful equity on the line. This piece highlights three ASX small-cap antimony miners from our insider ownership screener that could deserve a spot on your watchlist.

The three stocks below are a helpful starting sample, and the full screen on Simply Wall St surfaced 9 more ASX antimony miners with insider alignment and equally compelling stories that are not covered here. To identify and analyse the highest conviction ideas in this space, head straight to the ASX Small-Cap Antimony Miners Where Insiders Have Skin in the Game screener.

Red Mountain Mining (ASX:RMX)

Red Mountain Mining is a tiny A$11 million explorer focused on critical minerals, with its Utah Antimony Project and related US and Australian antimony assets providing direct exposure to the screener’s critical metal theme, while lithium and gold prospects round out a broader early-stage portfolio.

For investors hunting early exposure to Western antimony supply, Red Mountain Mining brings multiple dedicated antimony projects into one small-cap story and is finally testing the ground that underpins that thesis.

"This week’s news: the company is now drilling into its Antimony project, on ground that is 3km long with surface tests that suggest it is rich in antimony (one rock sample ran as high as 39%)."

The most-followed narrative on the Simply Wall St community about Red Mountain Mining focuses on its exploration projects targeting antimony and tungsten in Australia and the US. It highlights the Armidale Antimony Project in NSW, its proximity to established deposits and the start of drilling at Oaky Creek, with results expected in early 2027. The narrative also points to Red Mountain’s Pioneer Tungsten Project in Montana and demand for both critical minerals. The author’s thesis is that successful drilling could provide a catalyst for the company, although Red Mountain remains a highly speculative explorer without a current resource estimate.

ASX:RMX Financial Position Analysis as at Sep 2026

American Tungsten and Antimony (ASX:AT4)

American Tungsten and Antimony is an A$104 million ASX explorer focused on antimony, tungsten, and gold, with its key antimony exposure coming from the Antimony Canyon Project in Utah. The business is still early stage, with negligible current operating revenue disclosed.

For investors drawn to critical minerals, American Tungsten and Antimony offers a pure exploration play on antimony through Antimony Canyon and recent US mine-to-metal progress, backed by insiders with meaningful holdings. It remains high risk and early stage, so a lot depends on how one unresolved execution step affects future economics.

That unresolved step makes the next move crucial, so review the DCF valuation analysis for American Tungsten and Antimony to see how different outcomes could reshape American Tungsten and Antimony’s potential.

AT4 Debt to Equity History as at Sep 2026

Xpedra Resources (ASX:XPD)

Xpedra Resources is a small A$16 million explorer focused on uranium, lithium, copper, antimony, gold, silver and rare earths in Peru and Canada, with current A$0.3 million revenue coming from gold and other precious metals.

Xpedra Resources ties into the antimony theme through its antimony gold exploration in Peru, giving you indirect exposure to this critical mineral within a broader portfolio of metals. The business is still tiny and loss-making, so a lot hinges on what happens when fresh technical leadership starts prioritising capital across those targets.

That capital allocation question is exactly why the analysis report for Xpedra Resources could be worth your time, before any new drilling spend reshapes the risk-reward picture.

ASX:XPD 1-Year Stock Price Chart

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Simply Wall St analyst Andrew Legget and Simply Wall St have no position in any of the companies mentioned. This article is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material.