Organic or acquired growth: why it changes everything

2026-08-02 · By Lubin Danilo, founder of Lubin Investment

Organic growth comes from selling to customers you already had (more volume, higher prices, or new customers won on your own); acquired growth comes from buying other companies whose revenue gets added to yours. The same total growth percentage can hide two opposite realities: one tells you something about real demand, the other depends mostly on the pace and price of future acquisitions.

The trap of a single number

Picture two companies reporting the exact same revenue growth this year: +20%. On paper, a rushed investor might judge them equivalent. Dig just a little and the gap becomes enormous. The first sold 20% more product to its existing customers, plus a few new ones, without buying anything. The second sold its products at the same pace as a year ago, but bought six small companies during the year, whose combined revenue happens to add up to exactly that extra 20% of growth. These are two radically different stories, yet the 'revenue' line on the income statement makes them indistinguishable at first glance.

That is exactly the distinction I make systematically before judging a company's quality in my screener: I always separate organic growth (what the company sells on top of what it already had last year) from external growth, also called growth by acquisition (what comes from companies bought and integrated during the year). A total growth number without this distinction tells me almost nothing about the real health of the business.

Why the distinction changes everything

Organic growth answers a simple, valuable question: is real demand for what the company sells actually increasing? If a company sells more software to the same customers, or wins new customers without needing to buy anyone, that is a direct signal about its product, its pricing, or its market. It is repeatable, predictable, and does not depend on any uncertain future decision.

Acquired growth answers a completely different question: has the company managed to find, pay a fair price for, and successfully integrate other companies? This growth depends on far more fragile factors: finding enough targets to buy each year, not overpaying (the number one risk), and pulling off the integration without losing the acquired company's customers or teams. A company can post 20% growth from acquisitions one year, then 2% the next simply because the deal market dried up or management judged prices too high, without anything changing in the underlying quality of the business.

A real example: Constellation Software

Constellation Software, the Canadian software company that buys dozens of small vertical-market software businesses every year, illustrates this mechanic perfectly. Over five years, its revenue growth reaches 20.6% a year, an impressive number that could suggest explosive demand for its products. The reality, once broken down, is different: in the first quarter of 2026, revenue grew 20% year over year, but organic growth alone (sales to already-owned customers) accounted for only 6% of that total, and just 2% once currency effects were stripped out. The rest, meaning most of the reported growth, came from integrating newly acquired companies, with about CA$1.6 billion deployed in that single quarter.

This does not mean Constellation Software is a bad business: its cash return on capital employed reaches 48.8%, meaning each Canadian dollar reinvested into an acquisition returns, on average, close to 49 cents of additional cash every year, a rare level that proves management picks and prices its targets intelligently. But it does mean the real question to ask is not 'will growth continue,' it is 'will the acquisition pipeline continue at this level of profitability,' a far more uncertain question than a simple trend extrapolation.

The other direction: pure organic growth

On the opposite end, a company like Comfort Systems USA, specialized in mechanical and electrical installations for industrial buildings, posted 51% organic growth in its recent results, without relying at all on an acquisition pace to explain it. That number says something very different: demand for its services is literally overflowing its current capacity, driven by a record order backlog. Organic growth that strong is generally rarer and, when confirmed over several quarters, more durable long term than external growth of the same magnitude, precisely because it does not depend on any future buying decision.

The reverse trap: mistaking acquisitions for incompetence

It would be just as wrong to conclude that growth by acquisition is automatically a negative signal. Roper Technologies, another serial acquirer of niche software, posts more modest organic growth (around 3 to 5% a year) but a capital return and disciplined allocation that, compounded over two decades, have created considerable shareholder value. The real question is therefore never 'organic or external,' but 'at what return, and with what consistency.' A company that buys businesses at a fair price and integrates them well can compound value just as effectively, if not more, than a company growing on its own but reinvesting its cash into low-return projects.

How I use this in my method

In my quality filter, I never settle for the headline revenue growth rate shown on an investor presentation. Whenever the data is available in quarterly reports, I always look at the organic share explicitly disclosed by the company itself. A company growing fast but refusing to break down its growth deserves extra scrutiny: it is not always a negative sign, but the lack of transparency on this point forces me to dig further before judging the growth criterion. You can find the detail of this criterion, cross-checked against the stock's price, in my full methodology, and see this distinction applied concretely in my Constellation Software analysis.

Organic growth comes from selling to customers you already had (volume, price, new customers won on your own); external growth comes from acquired companies whose revenue adds to yours.
The same total growth percentage can hide opposite realities: Constellation Software posts 20.6% growth a year over 5 years, but the organic share was only 6% (2% excluding currency effects) last quarter, most of it coming from acquisitions.
Conversely, Comfort Systems USA posted 51% pure organic growth, a signal of real demand overflowing current capacity, with no reliance on any acquisition.
Acquired growth is not a flaw in itself: Roper Technologies has compounded value for two decades through disciplined, high-return acquisitions, despite modest organic growth (3 to 5% a year).
The real question is never 'organic or external' alone, but the return and consistency of growth regardless of its source: that is what I systematically check before judging a stock's growth criterion.

FAQ

What is organic growth for a company?

It is sales growth generated from what the company already had the previous year: more volume sold, higher prices, or new customers won without buying any company. It excludes any acquisition effect.

What is external growth, or growth by acquisition?

It is the share of revenue growth that comes from companies bought and integrated during the year. The acquired company's revenue mechanically adds to the buyer's, with no direct link to demand for the buyer's existing products.

Is growth by acquisition worse than organic growth?

Not necessarily. It depends on more uncertain factors (finding targets, not overpaying, successful integration), but a company that acquires intelligently at a good return, like Roper Technologies or Constellation Software, can create as much value as a purely organically growing company.

How do I know whether a stock's growth is organic or external?

Most large companies disclose this detail in their quarterly results or investor presentations, often under the label 'organic growth' or 'like-for-like.' If the information is not clearly disclosed, that is itself a signal worth digging into before judging the quality of the growth.

Why does Lubin systematically make this distinction in his analysis?

Because a total growth number without this distinction can mask a very different reality from one company to another. Understanding the source of growth helps judge whether it is repeatable and predictable, or whether it depends on a far more uncertain future acquisition pipeline.

About the author

Written by Lubin Danilo, founder of Lubin Investment. A self-taught individual investor, I find fundamental analysis fascinating, and it has delivered excellent results. For three years now, my performance has beaten the S&P 500. But analyzing every stock took too much time: sites with incomplete data, calculation methods and criteria never aligned with mine. And spotting the best stocks was just as time-consuming, even with my own well-defined checklist. So I put my software development background to work to build this software, base my investment strategy on its results, and share it with people who share the same passion as me. It judges a company's quality and its price separately, using criteria drawn from the financial literature (Warren Buffett, Michael Mauboussin, Aswath Damodaran).