What it means
When you own shares in a major public company like Apple, you can sell them instantly on a stock exchange during trading hours. Private company shares, however, do not have this luxury.
If you own a stake in a local bakery or a private tech startup, finding a willing buyer takes time, legal work, and negotiation. Because of this delay and difficulty, financial experts apply a marketability discount to lower the estimated value of the private shares.
This concept matters immensely during business valuations for tax purposes, estate planning, divorces, or when bringing in outside investors. If an appraiser values a private manufacturing business at ten million pounds overall, your twenty percent stake is not automatically worth two million pounds.
A discount for lack of marketability is usually subtracted to reflect the trapped nature of your capital. In practice, business valuators determine this discount by studying restricted stock studies or pre-initial public offering transactions.
They compare private company share sales to similar public company shares to see how much investors demand as a price penalty for illiquidity. The resulting percentage lowers the final valuation figure.
Non-finance managers need to grasp this because company valuations are rarely straightforward. When reviewing financial reports, estate plans, or equity purchase offers, recognizing this discount helps you understand why private equity is valued differently from public shares, ensuring realistic financial expectations.
In practice
Real-world examples.
Example
You own a 15 percent stake in a private software firm valued at 1 million pounds. Because the shares are hard to sell, a 25 percent marketability discount is applied, making your actual stake worth 112,500 pounds instead of 150,000 pounds.
Example
A family-run manufacturing business is valued at 4 million pounds for inheritance tax. The accountant applies a 30 percent marketability discount to the shares passing to the children, reflecting the months it would take to find a buyer.
Example
An angel investor is negotiating to buy a 10 percent share of a private logistics company. The founders use a marketability discount to lower the purchase price, arguing the investor cannot cash out quickly if the market drops.
Think of it
“Imagine two identical houses. One is in a busy suburb with buyers lined up outside. The other is on a remote island where boats arrive once a month. You must lower the price of the island house just to attract a rare buyer willing to wait.
Formula
Calculation
Base Value x (1 - Discount Percentage) = Final Marketable Value. For example, if a private business interest is valued at 500,000 pounds before discounts, and the appraiser applies a 20 percent marketability discount, the calculation is 500,000 x (1 - 0.20) = 400,000 pounds.Case study
Seen in the real world.
GreenField Logistics, a mid-sized regional transport company, prepared for a shareholder buyout when one of the founders decided to retire. The firm hired an independent valuation expert to determine the fair market value of the retiring founder's 30 percent equity stake. The expert initially calculated the total company value at 5 million pounds, suggesting the 30 percent stake was worth 1.5 million pounds.
However, because GreenField Logistics was a private company with tight ownership restrictions that required board approval for any share transfer, the expert applied a 25 percent marketability discount. This reduced the valuation of the retiring founder's shares to 1,125,000 pounds. The remaining owners used this discounted figure to negotiate the buyout successfully. This case shows how illiquidity directly impacts cash payouts in private business transactions.
Watch out
Common mistakes.
- Confusing marketability discounts with minority discounts, which relate to a lack of control rather than a lack of liquidity.
- Applying a generic percentage discount without researching industry-specific restricted stock studies or private transaction data.
- Assuming private company shares are worth their exact proportional fraction of the total business value without adjustments.
Questions
People also ask.
Why do private shares need a discount?
Private shares cannot be sold instantly on an exchange. The discount compensates buyers for the time, cost, and risk of finding a buyer.
Who decides the size of the discount?
Certified business valuators determine the percentage using empirical data, market studies, and specific characteristics of the company.
Is a marketability discount always used?
Not always. If the company is actively preparing for a public stock market launch or has a guaranteed buyer agreement, the discount may be lower or zero.
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