How much of a company's growth is real, and how much is from buying other companies?

A company announces "revenue growth of 15% year over year." Investors hear this and assume the business is growing 15%. But when you read the footnotes, you discover that organic growth—the growth of the existing business on a like-for-like basis—was only 5%. The remaining 10% came from an acquisition completed mid-year. Similarly, a company might report "strong growth" in international markets while omitting to mention that half the growth is from currency tailwinds. Understanding organic growth—what the business would have earned if there had been no acquisitions, divestitures, or currency movements—is essential to assessing the true health of a business.

Quick definition: Organic growth is the revenue growth of a company on a like-for-like basis, excluding acquisitions, divestitures, and the effects of foreign exchange currency movements. It isolates the growth of the existing business. Reported growth is the year-over-year change in revenue as reported, which includes acquisitions, divestitures, and currency effects. Organic growth is more difficult to calculate and less commonly disclosed, but it is a more accurate measure of business momentum.

Key takeaways

• Reported growth conflates the growth of the existing business with the impact of M&A and currency movements, making it difficult to assess true business momentum.
• Organic growth isolates the existing business and is the metric that best indicates whether the company is winning market share or losing it.
• Companies have discretion in how they define "organic growth"—which acquisitions to exclude (recently acquired or only those acquired in the current period?), how to handle divestitures (as a one-time adjustment or as an ongoing reduction?), and how to treat currency (using current period rates or prior-period rates?).
• The gap between reported and organic growth can be large (20+ percentage points) for serial acquirers, masking underlying business stagnation.
• Currency effects can inflate reported growth by 5–10+ percentage points in volatile periods, making it difficult to assess operational performance.
• Forensic investors calculate organic growth themselves, rather than relying on the company's definition, to ensure comparability across companies and time periods.
• A company with strong reported growth but weak organic growth is a red flag—it may be growing only through acquisition or currency tailwinds, not business strength.

The mechanics of organic growth calculation

The formula for organic growth is deceptively simple:

Organic Revenue Growth % = (Current Period Revenue - Prior Period Revenue (adjusted for M&A and currency)) / Prior Period Revenue (adjusted for M&A and currency)

But each component requires careful calculation.

Step 1: Start with reported revenue.

Company reports Q1 revenue of $1,000 million, vs. Q1 prior year of $900 million. Reported growth is 11%.

Step 2: Adjust for acquisitions.

The company acquired Company B on September 1 in the prior year. So Company B's revenue is included in Q1 of both the current year and prior year. No adjustment needed.

But the company acquired Company C on March 15 of the current year. Company C was independent in the prior year, so its revenue is not included in prior-year Q1. We must exclude Company C's revenue from current Q1.

Company C contributed $50 million to Q1 revenue. Adjusted current Q1 revenue: $1,000M - $50M = $950M.

Step 3: Adjust for divestitures.

The company sold Division D on January 5 of the current year. Division D contributed $30 million to prior-year Q1. But it is not in current-year Q1.

We must exclude Division D from prior Q1. Adjusted prior Q1 revenue: $900M - $30M = $870M.

Step 4: Adjust for currency.

Many companies report in USD but have significant international revenue. If the USD strengthened against foreign currencies in the current period, reported revenue will be lower than it otherwise would be (because foreign currency revenues are converted to fewer dollars).

To measure organic growth, companies restate prior-period revenue at current-period exchange rates (or vice versa), eliminating the currency effect.

Example: Company's international revenue in Q1 prior year was $200 million. In Q1 current year, the same international revenue was $220 million. But the USD strengthened 5% against the company's reporting currencies. In constant currency, Q1 current year revenue would have been $209 million (not $220M), representing only a 4.5% increase, not a 10% increase.

Adjusted current Q1 at constant currency revenue: $950M - $11M (currency tailwind) = $939M.

Step 5: Calculate organic growth.

Organic Growth = ($939M - $870M) / $870M = $69M / $870M = 7.9%

So organic growth is 7.9%, vs. reported growth of 11%. The gap of 3.1 percentage points comes from the combination of the Company C acquisition (which is in current but not the adjusted prior), the currency tailwind, and the divestiture adjustment.

Why organic growth matters more than reported growth

Reported growth conflates the operational performance of the existing business with M&A activity and currency movements. A company could have a deteriorating core business but report strong growth simply by acquiring other companies or benefiting from currency movements.

Example: A retail company reports 15% reported revenue growth. Decomposed:

• Organic growth: 2%
• Acquisitions: 10%
• Currency tailwinds: 3%

The core business (organic growth of 2%) is nearly flat, barely keeping pace with inflation. The reported 15% is artificially strong. Yet many investors, looking at the headline 15% figure, think the company is thriving. The reality is that the company is growing primarily through acquisitions, which is a lower-quality form of growth (it requires deploying capital and integrating businesses) and is not sustainable indefinitely (eventually, there are no more companies to acquire).

Conversely, a company with 2% reported growth but 8% organic growth is improving its underlying business despite currency headwinds or divestitures. This is higher-quality growth.

How companies define "organic growth" (and the discretion this permits)

The SEC has no binding definition of organic growth, so companies have discretion. This creates an incentive for aggressive definitions.

Recent acquisitions

Some companies define organic growth to exclude acquisitions made in the last 12 months. Others exclude acquisitions made in the last 24 months. The longer the exclusion window, the more M&A activity is netted out and the higher organic growth appears.

A serial acquirer might define organic growth as "excluding acquisitions made in the last 24 months" to capture the full benefit of its acquisition strategy. A more conservative definition would be "excluding all acquisition revenue," which gives a purer view of the existing business.

Divestitures

If a company sells a division, should that division be excluded from prior-year results for the purpose of calculating organic growth? If yes, organic growth appears higher. If no, organic growth appears lower.

A company selling a low-margin division might define organic growth to exclude the division from prior-year results, showing a higher organic growth rate. A company selling a high-margin division might include it in the comparison, showing more muted organic growth.

Currency methodology

Companies can restate prior-period revenue at current-period exchange rates (showing constant-currency growth) or restate current-period revenue at prior-period rates (showing organic growth at prior rates). The choice affects the reported number.

Additionally, some companies use average exchange rates for the period; others use period-end rates. The choice can shift the organic growth rate by 1–2 percentage points.

Roll-forward periods

Should organic growth be calculated on a quarter-by-quarter basis or on a rolling 12-month basis? Quarter-by-quarter can be volatile (especially if acquisitions closed mid-quarter). Rolling 12-month can smooth out seasonality but obscures recent trends. Different methodologies yield different results.

The mermaid diagram illustrates how reported growth is decomposed into organic and non-organic components:

The decomposition reveals that most of the reported growth is inorganic or transitory (divestitures, currency).

Red flags in organic growth disclosures

1. Organic growth is not disclosed at all

A company reporting only reported growth and avoiding organic growth disclosure is being opaque. Why would management omit organic growth if it is strong? This is a red flag.

Some companies provide constant-currency growth (adjusting for currency only, not M&A), which is a middle ground. But true organic growth (excluding both currency and M&A) is more relevant.

2. Organic growth definition is buried in footnotes or differs from peers

If a company defines organic growth differently from competitors, comparability is lost. Always compare definitions. If one company excludes acquisitions made in the last 12 months and another excludes only the last 6 months, their organic growth rates are not directly comparable.

3. Organic growth is significantly below reported growth

A large gap (e.g., 15% reported, 2% organic) suggests that most growth is coming from M&A or currency, not from the operating business. This raises questions about the quality of growth and sustainability.

4. Organic growth is declining while reported growth is rising

This pattern indicates that the company is increasingly relying on acquisitions or currency to mask a weakening core business. It is a red flag.

5. The company excludes recent significant acquisitions from organic growth

If a company acquired another company 6 months ago and is still excluding it from organic growth metrics, it is artificially reducing the impact of the acquisition. Within 12 months, that acquisition should be integrated into the baseline, and organic growth should reflect the existing business including the recent acquisition.

Real-world examples

Constellation Software: Constellation is a serial acquirer that defines organic growth as "the growth of our existing business on a comparable basis." By constantly acquiring new software companies and defining them as part of the baseline, Constellation reports organic growth rates that exceed most of its peers. But on a true organic basis (existing business without any M&A), growth is likely lower. The company's strong reported growth is, in part, a reflection of its acquisition strategy, not operational excellence.

Microsoft: Microsoft discloses both reported and constant-currency revenue growth. For much of the last decade, the company's reported growth rates were boosted by currency tailwinds (especially when the USD was weak). When the USD strengthened (2014–2015, 2022), reported growth rates declined sharply even though the operating business was performing consistently. This illustrates how currency can mask or distort reported growth.

Heinz: When 3G Capital took Heinz private in a leveraged buyout, organic growth became the focus (the company was no longer required to report quarterly). The company's reported growth was muted by a 2–3% annual decline from divestitures of low-margin, low-growth brands. But organic growth was stronger, showing that the core business was holding up. As Heinz was restructured and cost-cut, organic growth eventually became a talking point in negotiations.

Abbott Laboratories: Abbott acquires businesses regularly. Reported growth often exceeds 10%, but organic growth is typically 3–6%. The gap reflects Abbott's strategy of growing through acquisition. Investors who focus on reported growth without adjusting for M&A would overestimate Abbott's operational momentum.

How to calculate organic growth yourself

1. Obtain historical revenue by segment and geography. This is typically disclosed in the 10-Q or 10-K footnotes.

2. Identify acquisitions and divestitures. The company discloses these in the MD&A section and in footnotes. Make a list of all M&A activity during the period and how much revenue each contributed.

3. Restate prior-period revenue. Remove revenue from acquisitions made in the current period and add back revenue from divestitures completed in the current period.

4. Obtain exchange rates. If currency is material, look up average exchange rates for each currency for the current and prior periods. Restate prior-period revenue at current-period rates.

5. Calculate organic growth. (Adjusted current revenue - Adjusted prior revenue) / Adjusted prior revenue.

6. Compare to company's disclosed organic growth. If your calculation matches the company's disclosure, you understand their methodology. If not, read their footnotes to understand the difference.

7. Compare organic growth to reported growth and competitors. A company with strong organic growth and modest reported growth (due to currency headwinds) is different from a company with strong reported growth but weak organic growth (due to acquisitions).

Organic growth as a quality indicator

Organic growth is a proxy for competitive position and market share. A company with strong organic growth is winning share from competitors or benefiting from end-market growth. A company with weak organic growth is either losing share or operating in a stagnant market.

Conversely, a company with strong reported growth but weak organic growth is compensating for a weak core business with acquisitions. This is not inherently bad—acquisitions can be valuable—but it is a lower-quality form of growth and signals that the organic business needs attention.

FAQ

Q: Is organic growth required to be disclosed? A: No, organic growth is not a GAAP metric and the SEC does not require it. Most companies disclose it voluntarily because investors demand it. Some companies disclose constant-currency growth (adjusting for currency only, not M&A), which is a partial disclosure.

Q: Should I use organic or reported growth for forecasting? A: Use organic growth to assess the momentum of the existing business. Use reported growth as an additional check on the impact of M&A and currency. When forecasting future growth, forecast organic growth of the existing business separately, then add the impact of announced acquisitions or expected currency effects.

Q: What is a healthy organic growth rate? A: It depends on industry maturity. In high-growth industries (cloud software, biotech), 15–30% organic growth is healthy. In mature industries (utilities, packaged goods), 2–5% organic growth is healthy. Always compare to peers in the same industry.

Q: If organic growth is lower than industry average, should I sell the stock? A: Not necessarily. A company with below-average organic growth might be in a specific niche where growth is inherently slower, or might be making strategic investments that will fuel future growth. But it is a yellow flag that warrants investigation.

Q: How volatile is organic growth year to year? A: Organic growth can be volatile, especially for companies with customer concentration or lumpy order patterns. Looking at a 3–5 year average of organic growth smooths out year-to-year noise.

Q: Why don't all companies disclose organic growth the same way? A: Because there is no standard definition, and companies have an incentive to define it in a way that makes their growth look strong. The SEC has not mandated a uniform definition.

Related concepts

• Comparable sales (same-store sales) – a retail-specific metric that isolates growth from existing stores, excluding new store openings
• Currency translation vs transaction effects – how foreign exchange affects reported results
• Constant-currency revenue growth – a partial adjustment for organic growth that accounts for currency only
• Acquisition synergies and integration – how M&A contributes to reported growth
• Same-store sales growth – a retail and restaurant metric that is similar to organic growth

Summary

Organic growth is the revenue growth of a company's existing business, excluding acquisitions, divestitures, and currency movements. It is a more reliable indicator of business momentum and competitive position than reported growth. Companies have discretion in defining organic growth, creating an opportunity for aggressive framing. A company with strong reported growth but weak organic growth is likely growing primarily through acquisition or currency tailwinds, which is a lower-quality form of growth. Forensic investors calculate organic growth themselves to ensure consistency and comparability, and compare organic growth to reported growth to assess the quality of growth. A company with strong organic growth and modest reported growth (due to currency headwinds) is healthier than a company with strong reported growth masking a stagnant or declining core business.

Next

Continue to the next article on constant-currency revenue growth for a deeper analysis of how currency effects are isolated and measured.

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Approximately 60% of S&P 500 companies disclose organic growth or constant-currency growth in their earnings announcements, but definitions vary significantly, making forensic recalculation necessary for fair comparison.