How do you estimate a private company's revenue?
Start with what the company had to file, then estimate the rest as a range. A US Form D asks issuers for a revenue band, from $1 to $1,000,000 upward, but lets them tick "Decline to Disclose" (Form D, item 5). Fill the gap with headcount, pricing and peers, and record every input.
Why is private company revenue so hard to find?
Private companies have no duty to publish income statements in the US, and many UK small companies can file "filleted" accounts that leave out the profit and loss account, so turnover never reaches the public register (Price Bailey). A planned UK change that would have made small company turnover public from April 2027 was paused in January 2026, according to formation agents tracking Companies House guidance (Rapid Formations).
The questions people ask in search and on Q&A sites repeat: where can I find the revenue, can I trust the database figure, and how do I estimate it myself. The answer to all 3 is the same method. Find any disclosed number first, estimate from at least 2 independent inputs, then write the result as a range with its sources.
Step 1. Check every filing that might carry a number
Look for a disclosed figure before you estimate anything.
- US Form D. Item 5 asks for revenue in bands, or aggregate net asset value for funds. Many issuers decline to disclose, but when a band is filled in, it is the company's own statement to the SEC (Form D). Our guide on how to read a Form D shows where item 5 sits.
- UK Companies House accounts. Medium and large companies file full accounts with turnover. Small companies often file a balance sheet only. Even a balance sheet helps: debtors, creditors and cash show the scale of trading.
- Court records and public contracts. Lawsuits, bankruptcy filings and government contract awards sometimes state revenue or contract values.
- The company's own words. Press releases, funding announcements and conference talks often mention revenue milestones or growth rates. Treat them as claims and note the date.
If you find a disclosed figure, use it as the anchor and stop estimating that part.
Step 2. Estimate from headcount
Revenue per employee is the method most guides call the most common for investors (Grata). Multiply a headcount by a typical revenue per employee for the sector, using public peers for the ratio.
The weak input is headcount. Grata notes that self-reported professional network figures can be unreliable, and that the exact count and the displayed range can differ enough to move the estimate a lot (Grata). Cross-check with the number of open roles, the officers listed on filings and, for UK companies, the average employee number in full accounts.
Step 3. Set a floor from payroll
A business that has run for several years usually brings in at least what it pays its staff. One sourcing guide multiplies headcount by average wages to get a bare minimum annual revenue, since the figure ignores every other cost (Sourcescrub). Use public wage statistics for the role mix and location. The floor rules out estimates that are too low, which is where headcount methods often fail for venture-funded companies spending ahead of revenue.
Step 4. Estimate from customers and price
If the company publishes its pricing and you can find a customer count, revenue is customers multiplied by price over a period (Exploding Topics). Customer counts appear in press releases, case study pages and investor announcements. Apply a discount for free tiers and annual contract discounts, and say what you assumed.
Step 5. Compare with public peers and funding stage
Public companies of similar size and model give you revenue per employee, gross margin and growth ranges. Funding history is a rough cross-check: a company that raised a small first round recently is unlikely to have large revenue, while a company several rounds in usually has meaningful sales. Use this to test the estimate, not to produce it.
Step 6. Write the range and show your working
Combine the methods into a low, central and high figure. A short table makes the reasoning easy to challenge:
| Method | Input | Source | Estimate |
|---|---|---|---|
| Disclosed band | Form D item 5 | SEC EDGAR filing, with date | Band, if given |
| Headcount | Employees times peer revenue per employee | Hiring pages, filings, peer annual reports | Range |
| Payroll floor | Employees times average wage | Public wage data | Minimum |
| Customers and price | Customer count times list price | Company announcements, pricing page | Range |
| Peer check | Peer ratios and funding stage | Public filings, Form D history | Pass or fail |
If the methods disagree by more than a factor of 2, say so and explain which input you trust least. A reader can work with an honest wide range. A precise number with no sources misleads.
Where does Tamarly Intelligence help?
Tamarly Intelligence is Tamarly's research platform on companies, funds, countries and markets, built from official filings and open data. It gathers the inputs above from free, open sources, including SEC EDGAR Form D filings and UK Companies House records, and every figure links to the filing or record it came from. For US issuers, the Form D history is rebuilt into rounds.
Tamarly does not publish revenue estimates of its own for private companies, and when it does not cover a company it says so. On Level 2 and above you can have Tamarly research a company from your portfolio and build a sourced profile of it, which gives you the filings to start Step 1. Ask the Brain answers plain-language questions with a numbered source on every sentence, graded A for an official filing down to D for a secondary source. For the wider method, see how to research a private company.
Build a sourced profile of any private company free for 7 days
Frequently asked questions
Does a Form D show a company's revenue?
Sometimes, as a band. Item 5 asks for a revenue range, with bands starting at $1 to $1,000,000, but the issuer may choose "Decline to Disclose" (Form D). Many operating companies take that option, so treat a filled band as a bonus.
How accurate is the revenue per employee method?
It is only as good as the headcount and the peer ratio. Headcount data from professional networks can be unreliable, which can move the result a lot (Grata). Use it with at least one other method and publish a range.
Can I see a UK company's turnover on Companies House?
For medium and large companies, yes, in the full accounts. Many small companies file filleted accounts without a profit and loss account, so turnover is not public (Price Bailey). The balance sheet still shows assets, debts and cash.
About the author. Melvine Manchau is the founder of Tamarly and author of the Tamarly Newsletter. He previously worked at PwC, Salesforce, BlackRock/eFront and Lazard.
About Tamarly Research. Tamarly Research is part of Tamarly Media, which holds no investment positions. Tamarly is a New York research house that studies how AI is changing regulated institutions.