The Australian share market has been bouncing around fresh all-time highs in recent weeks. While short-term moves can capture headlines, what really matters for long-term investors are the companies quietly compounding wealth year after year.
These businesses tend to share a common trait: durable competitive advantages, or "moats", that protect them from rivals. It is these moats that allow them to steadily grow earnings and reward shareholders through good times and bad.
Here are three such ASX shares that have delivered astonishing gains in recent years and may continue to do so for years to come.
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Pinnacle Investment Management (ASX: PNI)
Over the past five years, Pinnacle's share price has climbed more than 300%. That means a $10,000 investment would now be worth over $40,000 — before counting the growing stream of dividends along the way.
So, what does this company do? Pinnacle operates a unique "multi-affiliate" investment management model. It provides seed capital, distribution, and infrastructure support to a select group of 15 investment firms, or "affiliates", spanning Australia, the UK, and North America. In return, it earns both service fees and a share of the profits from its equity stakes in these affiliates.
This selective model has proven very lucrative. For FY2025, Pinnacle reported revenue growth of 34% to $65.5 million and a 49% jump in net profit after tax to $134.4 million. Importantly, the company benefits when its affiliates outperform, as shown by the sharp increase in performance fees during the year.
The moat here comes from the ecosystem Pinnacle has built. Affiliates gain scale, distribution, and credibility by partnering with Pinnacle, while Pinnacle itself earns a diversified and growing income stream. It's a win-win structure that has delivered compounding returns for investors.
TechnologyOne (ASX: TNE)
TechnologyOne is another home-grown compounding machine. Its share price has surged more than 350% over the past five years, turning $10,000 into about $45,000 — and that's before dividends.
The company is Australia's largest enterprise software provider, offering a cloud-based SaaS platform used by over 1,200 organisations, including government agencies, universities, and corporations.
Its moat lies in deep customer integration and high switching costs. Once an organisation embeds TechnologyOne's software into its operations, moving to another provider is costly and disruptive. That translates into sticky, long-term relationships.
The numbers tell the story: In its FY2025 half-year result, TechnologyOne grew net profit after tax by 31% to $63 million, with annual recurring revenue rising 21% to $511 million. Even more impressive, it reported net revenue retention of 118% — meaning existing customers are spending nearly 20% more each year.
With a track record of investing heavily in R&D and a customer base unlikely to abandon mission-critical systems, TechnologyOne looks well-positioned to keep compounding well into the future.
Supply Network (ASX: SNL)
If you thought 300% or 350% share price gains were impressive, Supply Network has gone even further. Its shares are up more than 780% over the past five years — turning $10,000 into a staggering $88,000, excluding dividends.
The company operates under the Multispares brand, supplying replacement parts and services for trucks and buses across Australia and New Zealand. It may sound like a simple business, but the results have been extraordinary.
What's the secret? Distribution and repeat customers. Australia's truck fleet is old — the average vehicle is nearly 15 years — and increasingly complex, with tens of thousands of parts per unit. Supply Network has built a trusted distribution system that makes it the go-to provider for fleet operators.
This shows up in the numbers: revenue has grown at a 14% compound annual rate over the past decade, and even faster more recently, with 18% growth in the last half-year. Return on equity has topped 30% for three years running.
Management expects growth to moderate toward its long-term average but has set an ambitious target of $450 million in revenue by FY2028. Given its track record of hitting goals ahead of schedule, investors may not want to bet against it.
Foolish takeaway
These companies highlight why finding durable competitive advantages — moats — is so critical for investors. Pinnacle's affiliate network, TechnologyOne's sticky software, and Supply Network's unrivalled distribution have all enabled them to compound wealth for shareholders.
Past returns, of course, don't guarantee future performance. Valuations and market conditions will always play a role. But identifying quality businesses with clear moats, and waiting for the right price, can be a game changer for long-term investors.
