AIM’s big winners: 28 shares up 100%+ in 2026

There are 28 FTSE AIM All-Share companies where the share price has at least doubled so far this year (as of 10 September). The FTSE AIM All-Share index has risen 2.9% over the same period. 

By comparison, the FTSE 100’s best performer, Computacenter (LSE:CCC), is up 74.9%. More than 40 companies on AIM have done better than that so far this year.

The 28 companies include Gooch & Housego (LSE:GHH), which is the subject of a takeover and will soon be leaving AIM. The others have a range of reasons why they have made gains or rebounded from declines in previous years.

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Semiconductor wafers manufacturer IQE (LSE:IQE) is the best performer on AIM this year. It is one of two constituents of the FTSE AIM UK 50 index that is in the list – the other is Gooch & Housego. The two companies are also in the FTSE AIM 100 index. IQE plans to move back to the main market after more than 23 years on AIM.

IQE started the year in the middle of a strategic review. There was no bid for the company and instead it raised £81 million including share issues at 19.8p/share. This brought semiconductor manufacturer MACOM on as a shareholder and technology partner. The cash reduced debt.

Revenues recovered in the first half, helping reduce the loss from £16 million to £8.2 million. Wireless revenues were two-fifths higher and photonics revenues grew 45%. The recent fundraising meant that net cash was £30.2 million at the end of June 2026.

IQE is currently up 812% at 45.6p. The share price was 14.75p when IQE moved to AIM.

The other AIM 100 constituent is Tungsten West (LSE:TUN). It is the fifth-best performer with a 343% gain. Securing finance to fund commissioning of the Hemerdon tungsten mine boosted the share price.

The financing was recently completed with a proposed investment of up to £71 million from the UK National Wealth Fund. This is via a £36 million equity investment at 36p/share for a 7.42% stake in Tungsten West, and a £25 million debt facility, plus a £10 million uncommitted accordion facility. The UK government has an opportunity to secure an offtake agreement for up to 50% of tungsten production at Hemerdon.

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Wound-healing technology developer AOTI Inc (LSE:AOTI) was named AIM best newcomer at the 2024 AIM Awards, and some might say it was not a surprise that the share price underperformed after gaining that accolade. AOTI joined AIM on 18 June 2024 when it raised £19.5 million at 132p/share, and by the end of 2025 the share price had fallen to an all-time low of 27.5p.

US-based AOTI has developed an at-home therapy device to deliver oxygen topically into chronic wounds, including diabetic foot ulcers and pressure ulcers. There are two main sources of revenues: The Veterans Administration and Medicaid. US government attempts to cut spending and difficulty in obtaining payments in Arizona hampered growth in revenues.

However, trading has been ahead of expectations in the first half of this year. Revenues grew 10% to $35 million (£25.9 million) despite the disruption from ceasing business in Arizona. The underlying growth was 18%. Full-year pre-tax profit expectations were increased from $1.2 million to $2.7 million

More important longer term is that the Centers for Medicare & Medicaid Services (CMS) has issued a proposed Local Coverage Determination (LCD) for Medicare and Medicaid. This helped the share price to jump 364% to 127.5p. making it the second-best performer.

Gibraltar-based RentGuarantor Holdings (LSE:RGG) provides an underwritten rent guarantee service in the private rental sector. The private rental market has grown in importance in the UK.

The Renters Rights Act came into force on 1 May. The abolition of no-fault evictions and a statutory cap on advance rent payments increased demand for professional services and products to reduce risk for landlords.

RentGuarantor has been building up its business for a decade, and the pace of growth has accelerated since the regulation changes. Revenues in the eight months to August 2026 were 472% higher at £8.45 million. That includes nearly £5 million in the latest three months, with £3.17 million generated in August alone.

There has been more than one forecast upgrade this year. The latest raised the pre-tax profit expected from £1.2 million to £4 million. There could even be a dividend. The share price has risen 208% to 94p.

Corporate finance boutique Marechale Capital (LSE:MAC) had a mixed record over the past couple of decades because its fortunes depended on the timing of corporate finance deals. At the beginning of June, the company announced it was turning itself into a digital merchant bank via three acquisitions. The share price reached 8.5p in the middle of June but it has fallen back. At 4.6p, the gain is still 163%.

Broker Stanford Capital Partners broadened the services that can be offered to corporate clients, asset management business NJC Capital can co-invest in opportunities brought to it by the rest of the group, and Delaware-based tokenisation company Blubird Global Inc has developed a multi-chain RWA tokenisation platform.

It is Blubird, which is effectively a registry operator for the tokens, that has attracted the attention of investors. The company has launched a $118 million Coral Futures reef programme on Blubird’s platform.

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Another company that has been transformed this year is European Green Transition (LSE:EGT), which at the end of February acquired Earthmill Maintenance and related businesses that provide operational and maintenance services for small scale onshore wind turbine owners. It was acquired from a company that is being liquidated and the price of £3.5 million debt-free appears a bargain.

In the four months to June 2026, revenues were £6.8 million, and in the 12 months to the end of 2026 revenues are expected to be £17 million to £18 million.

European Green transition is targeting annual revenues of £50 million in the medium term, which could generate double-digit underlying profit (EBITDA). This indicates that there could still be significant upside potential for the share price.

The closure of the online operations of TheWorks (LSE:WRKS) to concentrate on retail stores and upgrading of profit expectations helped the share price recover. It has not been this high since 2019.

Winning contracts has helped many companies make sharp share price gains. Digital transformation services provider TPXimpact Holdings  Ordinary Shares (LSE:TPX) has won additional contracts and extensions with government departments, and these have underpinned forecasts making investors more confident in them.

Security technology provider Thruvision Group (LSE:THRU) shares have rebounded after it won new business in Asia and Canada. However, cash remains a constraint for the business, and a fundraising could hit the share price.

Specialist coatings provider Hardide (LSE:HDD) has been investing in capacity and customer approvals for facilities. This is paying off this year and enabled a move into profit.

Business won has led to Hardide generating revenues of £8.9 million so far in this financial year. There have been upgrades, and the latest one raised 2025-26 pre-tax profit from £3.4 million to £4.6 million. This shows the operational gearing of the business. The share price rebounded 343% to 82p.

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Mulberry Group (LSE:MUL) used to be one of the largest companies on AIM and it had a market capitalisation of more than £1 billion early in 2012. Shares have been issued since then and the market capitalisation is less than one-fifth of that level. Even after a 167% recovery to 294.6p, the share price is still lower than four years ago and barely one-quarter of what it was 10 years ago.

New chief executive Andrea Baldo launched the Back to the Mulberry Spirit strategy in early 2025, and this has cut the 2026-26 loss and returned the lifestyle brand to growth. A profit is expected in 2027-28.

Prospex Energy  Ordinary Shares (LSE:PXEN), Star Energy Group (LSE:STAR), Chariot Ltd (LSE:CHAR) and Arrow Exploration Corp (LSE:AXL) have made gains on the back of the higher oil price.

Some of the gains are based on hope. Mercantile Ports and Logistics Ltd (LSE:MPL) continues to try to regain control of the Karanja Terminal & Logistics subsidiary. Mercantile says it can repay the related debt, but the proposal was rejected by the consortium of banks. They prefer an alternative plan from Adani Ports and Special Economic Zone Limited and that was approved by the courts. The company is putting its case to the National Company Law Tribunal in India.

The port handled 1.2 million metric tonnes (MT) of cargo in 2025, compared to 1.33 million MT in the previous year. The company’s net debt is £49.6 million. There is a significant risk that the tribunal could go against the company leaving it with little in the way of assets. 

Source: ShareScope, 10 September 2026. Past performance is not a guide to future performance.