What it means
The defining feature is not size but spread. A diversified company can be a $50 million family group with a hardware distribution arm and a property rental arm, or a global industrial group with aerospace, healthcare and energy divisions under one share price.
Diversification matters because it changes the shape of the earnings stream. Different divisions typically peak and trough at different points in the economic cycle, so group profit tends to be steadier than any single division's profit, though it is also rarely as spectacular in a good year.
You can see it clearly in the accounts. Accounting rules require companies to disclose segment reporting, which breaks revenue, profit and often assets down by division, and this is where an investor works out how diversified a group really is.
The main criticism is that diversification destroys as much value as it protects. Capital earned by a strong division may be spent propping up a weak one, and the resulting complexity means analysts often value the group below the sum of its parts, an effect known as the conglomerate discount.
The counter-argument is that a good parent adds something the divisions could not get alone. Cheaper group borrowing, disciplined capital allocation, shared back office functions and the ability to move talent between businesses are the standard justifications for keeping the parts together.
In practice
Real-world examples.
Example
An investor comparing two industrial shares checks the segment note in each annual report. One company earns 92% of revenue from a single automotive customer base; the other spreads revenue across four segments, and the investor accepts a lower expected growth rate in exchange for the steadier profile.
Example
A diversified family holding company in food distribution uses cash from its stable wholesale arm to fund a loss-making but fast-growing ready-meals brand. The board sets a three-year deadline after which the new division must fund itself or be sold.
Example
A diversified engineering group announces it will spin off its consumer products division after activist shareholders argue the group trades at a 20% discount to the value of its separate parts. The remaining business is repositioned as a focused industrial pure play.
Formula
Calculation
Diversification is usually measured with a concentration index. Take each segment's share of group revenue, square it, and add the squares together; then subtract that total from 1 to give a diversification score between 0 (all revenue in one segment) and close to 1 (spread very widely).
Beacon Industries reports four segments for the year: electrical products $400 million, building services $300 million, packaging $200 million and specialty chemicals $100 million. Total group revenue is $400 million + $300 million + $200 million + $100 million = $1,000 million.
The segment shares are 0.40, 0.30, 0.20 and 0.10. Squaring each gives 0.16, 0.09, 0.04 and 0.01, and the sum of the squares is 0.16 + 0.09 + 0.04 + 0.01 = 0.30.
The diversification score is 1 - 0.30 = 0.70. A single-segment competitor would score 1 - 1.00 = 0, so Beacon is genuinely diversified. If instead electrical products made up $800 million of the $1,000 million total with the rest split evenly, the sum of squares would rise and the score would fall, telling you the group is diversified in name more than in substance.Case study
Seen in the real world.
Marlowe Holdings is an invented company used here as an illustrative example of how a diversified company is judged. In the fictional scenario, Marlowe reported group revenue of $1,000 million across four segments, with no division contributing more than 40% and none less than 10%. Group operating margin was 11%.
Analysts covering Marlowe valued each segment separately using the multiples of focused competitors and arrived at a combined value of $1.8 billion. Marlowe's actual market value was $1.5 billion, a discount of about 17%. The stated reasons were familiar: a head office costing $30 million a year, a history of funding the weakest division out of the strongest one, and accounts that took real effort to unpick.
Marlowe's board responded not by breaking up the group but by publishing divisional return-on-capital targets and committing to sell any division that missed them for three consecutive years. In this illustrative example the discount narrowed over the following two years, which is the usual lesson: diversification is punished when capital allocation looks undisciplined, and tolerated when it clearly is not.
Watch out
Common mistakes.
- Treating any company with several products as diversified. Selling six variations of the same product to the same customers is a product range, not diversification, because all the revenue still depends on one market.
- Assuming a diversified company is automatically safer. If every division sells to the same industry or the same economy, the group carries concentrated risk regardless of how many segments the accounts show.
- Judging the group only on consolidated numbers. Group totals hide a strong division subsidising a weak one, which is exactly what the segment note exists to reveal.
Questions
People also ask.
What is the difference between a diversified company and a conglomerate?
It is a matter of degree. A diversified company operates in more than one market, while a conglomerate holds businesses with little or no relationship to one another.
Why do diversified companies often trade at a discount?
Because their accounts are harder to analyse, their capital allocation is harder to police, and investors can build their own diversification cheaply by holding several focused shares instead.
How can I tell how diversified a company really is?
Read the segment reporting note in the annual report and calculate each segment's share of revenue and of operating profit, since a segment can carry 30% of revenue and only 5% of profit.
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