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Sum-of-the-parts.

Aka. SOTP · sum-of-the-parts analysis · breakup value
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What is sum-of-the-parts?

Sum-of-the-parts (SOTP) values a company by breaking it into its distinct business segments, valuing each one on the basis that best fits it, and then adding the pieces together. It is the natural method for conglomerates and diversified businesses, where a single blended multiple would obscure how differently the segments are actually worth.

The premise is that a software division, a hardware division, and a real-estate holding do not deserve the same multiple. Valuing them separately — each against its own comparable set — produces a more honest answer than treating the whole as one undifferentiated entity.

SOTP is also the lens for a breakup analysis: if the parts are collectively worth more than the company's current trading value, there may be a conglomerate discount to unlock by spinning off or selling divisions.

How a sum-of-the-parts is built

The method is disciplined segment-by-segment, then reassembled.

  1. Split the company into segments that can be valued independently — usually following the reporting segments, sometimes finer.
  2. Value each segment on its own basis. Apply the multiple of that segment's peer group to its metric, or run a standalone DCF, whichever fits the business.
  3. Sum the segment enterprise values to get a total operating enterprise value.
  4. Add non-operating assets — stakes in other companies, excess real estate, investments — valued separately.
  5. Subtract corporate costs and net debt. Unallocated head-office overhead is a drag that must be capitalized and netted, then bridge to equity value.

Where sum-of-the-parts goes wrong

The most common error is ignoring the cost of the corporate center. A SOTP that adds up divisions but forgets unallocated overhead, shared services, and stranded costs will overstate value — those costs are real and do not vanish when you draw segment boundaries.

The second is assuming the parts can actually be separated cleanly. Tax leakage on a spin-off, lost synergies between divisions, dis-synergies, and shared infrastructure all reduce the realizable breakup value below the arithmetic sum. SOTP shows the theoretical ceiling; execution friction sets the real floor.

Frequently asked.

5 questions
01 When should I use sum-of-the-parts instead of a single multiple?

When a company's segments are genuinely different businesses that deserve different multiples — a conglomerate, a diversified industrial, or a firm with a fast-growing division buried inside a mature one. A single blended multiple averages them into a misleading number; SOTP values each on its own terms.

02 What is a conglomerate discount?

It is the gap when a diversified company trades for less than the sum of its independently valued parts. The market may apply it because of complexity, weak capital allocation, or a lack of focus. A SOTP analysis quantifies the discount and frames the case for a breakup, spin-off, or divestiture to unlock it.

03 How do you handle corporate overhead in a SOTP?

Unallocated corporate costs must be capitalized — typically by applying a multiple to the recurring overhead — and subtracted from the sum of the segment values. Skipping this is the most common SOTP error and systematically overstates the total.

04 Does sum-of-the-parts give enterprise value or equity value?

The segment values typically sum to a total operating enterprise value. You then add non-operating assets and subtract net debt, preferred, and minority interests — the standard bridge — to reach equity value, and divide by shares for a per-share figure.

05 Why might breakup value not be fully realizable?

Because separating the parts has costs the arithmetic ignores: taxes on a spin-off, dis-synergies and shared infrastructure that have to be duplicated, lost cross-segment benefits, and transaction friction. SOTP sets the theoretical ceiling; the achievable value after execution is usually lower.

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