S&P/ASX 300 Index (ASX: XKO) shares rose 2.84% and delivered a total return, including dividends, of 6.16% in FY26.
The ASX 300 underperformed the S&P/ASX 200 Index (ASX: XJO), which lifted 2.77% and gave a total return of 7%.
As always, there were outliers. And boy, did they outperform.
Here are three ASX 300 shares that were on a supersonic growth trajectory last financial year.
Image source: Getty Images
3 ASX 300 shares that smashed their peers in FY26
Sunrise Energy Metals Ltd (ASX: SRL)
This ASX 300 mining share ripped 2,040% higher in FY26, finishing the year at $17.23.
Sunrise Energy is working towards becoming a world-leading supplier of refined metals for advanced and emerging technologies.
The company is focused on scandium, nickel, and cobalt, which are in demand in the energy, defence, transport, and computing sectors.
Sunrise Energy owns one of the world's largest undeveloped scandium mines, the Syerston Scandium Project, in central-west NSW.
Scandium has many uses in the modern, high-tech world.
For example, it is 3D-printed into a high-performance alloy for aerospace components.
Scandium is also in the 5G/6G semiconductors in mobile phones and communications infrastructure.
Sunrise says the project "will bring a new source of low cost, scalable and reliable supply to western markets".
The company forecasts production of 64,000 tonnes per annum (tpa) of ore to produce 60tpa of high purity scandium oxide per year.
Sunrise Energy Metals says:
This positions the Company to capture significant market share in a rapidly growing global market (currently estimated at 50-60tpa), driven by solid oxide fuel cell deployments for AI data centre power generation, defense and aerospace applications and next-generation chips/semiconductors.
Syerston has a forecast life-of-mine average cash operating cost of US$534 per kilogram of high purity scandium oxide.
This would make Syerston one of the world's lowest-cost producers.
Today, Sunrise announced an accelerated expansion study to lift its forecast annual output to 180tpa.
The company also has the Sunrise Nickel-Cobalt Project, one of the world's largest nickel-cobalt resources, also in central-west NSW.
Nickel and cobalt are essential ingredients in EV battery cathodes.
They are also used in high-performance alloys for aerospace, defence, and other advanced manufacturing applications.
Among the tailwinds for Sunrise Energy Metals shares in FY26 were positive updates from the company and export controls introduced by China, which forced buyers to shift focus to alternative suppliers.
4DMedical Ltd (ASX: 4DX)
This ASX 300 healthcare share skyrocketed 1,786% in FY26 to close out the year at $4.53.
The highlight of FY26 for this respiratory imaging technology company was gaining US Food and Drug Administration (FDA) approval for its CT:VQ product in September 2025.
CT:VQ is the world's first non‑contrast post‑processing technology that transforms routine chest CTs into quantitative, lobar ventilation (V) and perfusion (Q) maps.
Since approval, the company has deployed its technology at several well-known academic hospitals and clinics.
They include the US Mayo Clinic, Stanford, Cleveland Clinic, UC San Diego Health, and University of Chicago Medicine.
Minerals 260 Ltd (ASX: MI6)
Minerals 260 was the best performer of the market's gold miners in FY26.
The Minerals 260 share price soared 508% to end FY26 at 73 cents per share.
This ASX 300 mineral explorer is building the Bullabulling Gold Project in Western Australia's Eastern Goldfields.
Bullabulling is one of Australia's largest near-term gold mines.
It has a Mineral Resource Estimate (MRE) of 130MT at 1.0g/t for 4.5Moz.
Minerals 260 recently signed a $220 million funding deal with gold royalty company, Franco-Nevada Corporation, to advance and de-risk the project.
