To calculate a pre-IPO share price, divide the company’s most recent post-money valuation by its fully diluted share count. A company last valued at $500 million with 100 million fully diluted shares works out to roughly $5 per share. The division is the easy part. Finding reliable numbers for the top and bottom of that fraction takes work, and the result almost always overstates what a common share is actually worth.
Finding the Valuation
The most reliable valuation for a private company is the one set by its most recent priced funding round. When a venture firm leads a Series A, B, or C, the deal fixes a post-money valuation: the company’s implied total worth immediately after the new cash lands. A startup that raises $50 million at a $500 million post-money valuation has priced itself at half a billion dollars. That’s the number you want at the top of the fraction.
Pre-money versus post-money matters here. Pre-money is what the company was worth before the new investment; post-money adds the fresh capital. Use the post-money figure, because it reflects the full capital structure after the dilution from the new round.
If you work at the company, the capitalization table is the master record. The cap table lists every shareholder, the number and type of shares held, ownership percentages, and the price paid in each round, along with the pre- and post-money valuation for every round. If you can’t see it directly, the stock plan administrator or CFO can give you the most recent valuation. Outside researchers can pull round-by-round figures from financial databases like PitchBook or Crunchbase, which aggregate press releases and regulatory filings.
When There Is No Recent Round
Some companies have no recent priced round to anchor to. A business that bootstrapped for years, or one whose last round closed three years ago in a different market, needs a valuation built from financial models.
Comparable company analysis takes valuation multiples from publicly traded firms in the same industry and applies them to the private company’s own numbers. Pull a ratio like enterprise-value-to-revenue or price-to-earnings from public peers, multiply by the private company’s revenue or earnings, and you get an estimated valuation. A private software company with $40 million in annual recurring revenue, valued at the median revenue multiple of eight from comparable public SaaS firms, lands at $320 million. The method only works if the peer group genuinely matches; the wrong comparisons produce a meaningless result.
A discounted cash flow (DCF) model takes a different route. You project revenue, expenses, and cash flow over five to ten years, then discount those future cash flows back to present value using a rate that reflects the risk of actually hitting the projections. Discount rates for private companies typically run 15% to 30%, because private firms carry more uncertainty and less liquidity than public stocks. A terminal value captures worth beyond the projection window. DCF is rigorous but very sensitive to assumptions: small changes to the growth rate or discount rate swing the output hard.
Counting Fully Diluted Shares
The denominator is not just the shares that exist today. It is every share that could exist if every conversion right were exercised. This fully diluted count is what makes a per-share price accurate or badly off.
Start with common stock held by founders and employees. Add preferred stock held by investors. Add every stock option granted under the equity incentive plan, both vested and unvested, plus any unallocated shares still sitting in the option pool. Include warrants, which are rights to buy shares at a set price.
Convertible instruments need careful handling. Convertible notes and Simple Agreements for Future Equity (SAFEs) turn into shares at a funding round or liquidity event, but the share count they produce depends on their specific terms. A SAFE with a $10 million valuation cap converts at a lower price per share, producing more shares, than one with a $20 million cap. The conversion math uses the cap table’s share count as its denominator, so these instruments can expand the total pool meaningfully. The cleanest path is to ask the company or stock plan administrator for the fully diluted count directly. Rebuilding it from scratch means tracking down every grant, warrant, and convertible on the books.
Doing the Division
With both numbers in hand:
Per-share price = Post-money valuation รท Fully diluted shares
A $500 million valuation and 100 million fully diluted shares produce a $5 per-share price. A 10,000-share stake carries an implied value of $50,000.
For stock options, the figure you care about is the spread: the difference between the per-share price and your strike price, which is the price you’d pay to exercise. If your strike price is $1 and the share price is $5, your spread is $4 per share, and 10,000 options carry an implied pre-tax value of $40,000.
That number is where most people stop. It should not be. The calculation assumes your common shares are worth exactly what an investor’s preferred shares are worth, that you can sell whenever you want, and that everyone gets paid equally in an exit. None of that is true.
Why the Calculated Price Overstates What a Common Share Is Worth
Valuation divided by shares treats every share as equal. In practice, preferred stock carries rights that make it worth considerably more than common stock, and private shares carry disadvantages that public shares do not. The gap between the headline per-share price and the real-world value of a common share is often large.
The Illiquidity Discount
Public stock can be sold in seconds. Pre-IPO shares cannot. The lack of marketability reduces real-world value by a meaningful percentage, often called a Discount for Lack of Marketability (DLOM). Estimates vary by methodology, but most range from 20% to 50%, depending on the company’s stage, how close it is to a liquidity event, and how restricted the shares are. A $5 calculated price with a 30% discount is realistically worth closer to $3.50 in a private transaction.
Liquidation Preferences
In an acquisition or IPO, preferred shareholders do not stand in the same line as common shareholders. Most preferred stock carries a liquidation preference, meaning investors get their money back, often at a 1x multiple of their investment, before common shareholders see anything. In a $500 million acquisition where investors put in $200 million with a 1x non-participating preference, they take $200 million off the top, leaving $300 million for everyone else.
Participating preferred is worse for common holders. Investors collect the liquidation preference and then share pro rata in whatever remains, alongside common shareholders. Some deals cap participation at a multiple like 2x or 3x the original investment, which limits the damage, but uncapped participating preferred can take a large bite out of exit proceeds. Before you treat the headline per-share price as the value of your common stock, confirm whether the preferred is non-participating, participating, or participating with a cap. The answer changes the math significantly.
Anti-Dilution Adjustments
If the company raises a future round at a lower valuation, a down round, most preferred stock includes anti-dilution protection that adjusts the investor’s conversion price downward. The broad-based weighted average formula is the most common version. It recalculates the price at which preferred shares convert to common, giving investors more shares while everyone else’s percentage shrinks. The protection exists for the preferred holders. Common shareholders absorb the dilution without any adjustment.
Your 409A Valuation Is a Different Number
Alongside the investor-led valuation, federal tax law requires a separate appraisal of common stock. Under Internal Revenue Code Section 409A, a private company must establish a fair market value for its common shares before granting stock options, and the strike price of every option must be set at or above that fair market value on the grant date.1eCFR. 26 CFR 1.409A-1 – Definitions and Covered Plans A strike price below fair market value triggers serious tax penalties for the employee.
The 409A value is almost always lower than the price investors paid for preferred stock, and that gap is deliberate. An independent appraiser values common stock specifically, applying discounts for lack of marketability and for the absence of the liquidation preferences, voting rights, and other protections that come with preferred shares. The appraisal must be performed by an independent third party and refreshed at least every twelve months or after a material event like a new funding round.1eCFR. 26 CFR 1.409A-1 – Definitions and Covered Plans
Use the 409A figure as a floor and a reality check on your own calculation. It is the IRS-recognized value of a common share, built on the same discounts that make the headline post-money per-share price an overstatement.
What the Number Is Actually Worth at Sale
The per-share price matters most when you try to turn equity into cash, and that is where the gap between calculation and reality shows up most clearly.
Secondary market platforms like Forge Global and EquityZen connect sellers of private stock with accredited buyers. These transactions come with high minimums, often $100,000 or more, seller transaction fees that have historically run around 5%, and pricing that typically reflects a meaningful discount to the last round’s valuation, because buyers want compensation for taking illiquidity risk. Before any sale clears, you will almost certainly have to get past the company’s right of first refusal (ROFR), a clause in most equity agreements that lets the company match any outside offer, usually within 15 to 30 days of written notice. If the company exercises its ROFR, it buys the shares itself at the offered price and the outside sale does not go through.
Even after an IPO, employees and insiders usually cannot sell immediately. Lock-up agreements restrict selling, transferring, or hedging for a period that typically runs 90 to 180 days after the offering, though the exact length varies by deal. The share price on IPO day is not the price you will sell at. Prices can move hard during the lock-up window, and a wave of insider selling when the lock-up expires often puts temporary downward pressure on the stock.
Putting the Pieces Together
The division is simple. Everything around it is not. Start with the most recent post-money valuation and the fully diluted share count, and do the arithmetic. Then discount the result for illiquidity, and discount it again for whatever liquidation preferences sit above common stock in the exit waterfall. Check the 409A valuation as a floor on common-share value. The spread between the headline per-share price and what a common share is really worth is almost always wider than it looks.