What it means
Imagine you own a house in a quiet neighbourhood. If you need cash tomorrow, you might have to slash the price to find a quick buyer.
That price drop is the real-world effect of illiquidity. In finance, an illiquidity discount reflects the reality that turning private assets into cash is difficult, risky, and time-consuming.
Publicly traded stocks can be sold in seconds with a click, but selling a private business or private equity stake requires months of searching, legal paperwork, and negotiation. Because investors take on the risk of being stuck with an asset they cannot sell during a crisis, they demand a lower purchase price upfront to compensate for that lack of flexibility.
For non-finance managers, understanding this concept is crucial when valuing a business, planning an exit strategy, or looking for outside investment. If you look at stock market valuations to guess your company's worth, you must apply an illiquidity discount to make a realistic comparison, as private companies are inherently harder to sell.
Think of selling a rare vintage car versus trading a widely traded smartphone. The smartphone can be sold online in minutes for its exact market value.
The vintage car might take six months of advertising to find the right buyer, forcing you to lower your asking price in the meantime.
In practice
Real-world examples
Example 1
You own a tech startup worth an estimated $2 million based on public market peers. Because your shares are private and hard to sell immediately, a buyer applies a 25% discount, valuing your stake at $1.5 million. The $500,000 difference is the price of not being able to sell quickly.
Example 2
A local manufacturing SME wants to value its shares for an internal employee share scheme. The independent valuation expert applies a 30% illiquidity discount due to the restricted market for selling shares locally. This lowers the price employees pay and reflects that they cannot easily sell their shares to anyone outside the firm.
Example 3
An angel investor holding minority shares in a private logistics firm accepts a lower buyout offer from the majority owner because there are no alternative buyers available on short notice. The investor would rather take a smaller sum now than wait years for an exit. The majority owner's offer is, in effect, an illiquidity discount.
Think of it
Think of selling a rare vintage car versus trading a widely traded smartphone. The smartphone can be sold online in minutes for its exact market value. The vintage car might take six months of advertising to find the right buyer, forcing you to lower your asking price in the meantime.
Formula
Calculation
Adjusted Value = Estimated Liquid Value x (1 - Illiquidity Discount Percentage). Discount Amount = Estimated Liquid Value x Illiquidity Discount Percentage.
Example: A company's base value using public market comparables is $1,000,000 and the chosen illiquidity discount is 20% (0.20). The discount amount is $1,000,000 x 0.20 = $200,000. Adjusted Value = $1,000,000 x (1 - 0.20) = $1,000,000 x 0.80 = $800,000.
The same maths works for a minority stake. A 10% holding in that company is worth $1,000,000 x 10% = $100,000 on a liquid basis, but $800,000 x 10% = $80,000 after the discount. To find the discount implied by a buyer's offer, divide the shortfall by the liquid value: an offer of $600,000 against a liquid value of $750,000 implies ($750,000 - $600,000) / $750,000 = 20%.Case study
Seen in the real world
This is a fictional, illustrative scenario. GreenLeaf Logistics, a mid-sized freight company based in Manchester, was preparing for a partial sale to an outside investor. The founders hired a financial consultant to determine the company's worth. Using data from similar publicly listed transport corporations, the consultant initially valued GreenLeaf at $5 million.
However, the consultant pointed out that GreenLeaf was a private family-owned business with restricted share transfer rules. To reflect the time, legal costs, and difficulty an investor would face if they tried to sell those shares later, the consultant applied a 25% illiquidity discount. This reduced the final valuation of the business for the transaction to $3.75 million. The founders were initially disappointed by the $1.25 million reduction, but it helped them understand why private market buyers demand a margin of safety for capital that is locked away.
The consultant also showed the effect on the stake being sold. A 20% holding would have been worth $1,000,000 on the public-comparable value but was priced at $750,000 after the discount. The founders decided to go ahead, and they added a clause letting the investor sell its shares back to the family after five years, which narrowed the discount in later talks.
Watch out
Common mistakes
- Assuming a private company is worth the exact same per share as a publicly traded competitor.
- Applying an arbitrary illiquidity discount percentage without looking at actual market data or holding periods.
- Forgetting that illiquidity discounts apply differently depending on how easily a specific asset can actually be sold.
Questions
People also ask
Why do private companies have an illiquidity discount?
Because investors cannot sell private shares instantly. The discount compensates them for the risk and time required to find a buyer.
Is the illiquidity discount always a fixed percentage?
No, it varies based on market conditions, company size, profitability, and how easily the specific asset can be converted to cash.
Does this discount apply to physical assets as well as company shares?
Yes, any asset that takes time and effort to sell, such as real estate or specialised machinery, suffers from illiquidity risks.