Here is a number that surprises many founders. According to Carta data shared in July 2026, the median Series A round priced companies at about $80 million, with roughly $14.4 million raised and about 12 percent of the company sold. Yet inside that median, valuations ranged from a fraction of that figure to several times higher. 

Two companies with similar revenue can land on very different sides of the line. So what separates them? The answer is not a single metric or a clever pitch. It is a set of drivers that investors, auditors, and business valuation companies services professionals examine again and again. Let’s unpack what those drivers are, and how they combine into value.

Valuation Is a View of Future Cash Flows, Adjusted for Risk

At its core, the value of any business equals the cash it can generate in the future, discounted for risk and time. Growth raises expected cash flows. Risk raises the discount rate. Most other terminology, from revenue multiples to comparable companies, is a shortcut for estimating those two things. Private companies add two complications: there is no daily market price, and ownership is split across different classes of shares with different rights. Both matter, as we will see.

Driver 1: Growth Rate, and How Durable It Is

Growth is the biggest lever, but the quality of growth matters as much as the speed. Investors look at:

  • Revenue growth rate: how fast sales are rising, year over year.
  • Net revenue retention: whether existing customers spend more over time. Above 100 percent means growth continues even without new customers.
  • Customer churn: how many customers or how much revenue leaks away.
  • Cohort behavior: whether newer customers behave as well as earlier ones.

A company growing 80 percent a year with sticky, expanding customers will usually command a far higher multiple than one growing at the same rate through discounts and constant replacement of lost customers.

Driver 2: Unit Economics and Margins

Growth that destroys cash is valued differently from growth that creates it. The key measures are:

  • Gross margin: software companies often target 70 to 80 percent or more, while other models run lower.
  • Customer acquisition cost (CAC) payback: how many months it takes to earn back the cost of winning a customer.
  • Lifetime value to CAC ratio: a commonly cited benchmark is 3 to 1 or better.
  • Burn multiple: how much cash the company burns for each dollar of new revenue added.

Some investors also use the “Rule of 40,” which adds revenue growth rate and profit margin, as a quick check on balance between growth and efficiency.

Driver 3: Market Size and Competitive Position

A growing company in a small market eventually hits a ceiling. A large, expanding market gives more room to run. Valuations also reflect defensibility: proprietary technology, switching costs, network effects, brand strength, and regulatory approvals all make profits harder for competitors to erode. A credible story about why this company will keep winning is worth real money.

Driver 4: Team, Concentration, and Execution Risk

People and concentration risk often decide close calls. Valuation analysts weigh:

  • The depth and track record of the management team.
  • Dependence on a few customers or a single channel.
  • Key person risk.
  • The company’s ability to hit its own forecasts, since a track record of beating plans lowers perceived risk.

Each added risk raises the discount rate applied to future cash flows, which lowers value.

Driver 5: Capital Structure, the Driver Founders Overlook

This is where private company valuation becomes distinctive. A headline round price usually reflects preferred stock, which comes with rights such as liquidation preferences, participation features, and anti-dilution protection. Common stock, held by founders and employees, sits behind those rights. That means common stock is generally worth less per share than the latest preferred price, and the gap depends on how much value would reach each class in different exit scenarios. 

Specialist valuation services companies use allocation methods such as the option pricing model (OPM), the probability-weighted expected return method (PWERM), or hybrid approaches to model those outcomes. They also consider a discount for lack of marketability (DLOM), since private shares cannot be sold freely. The median founding team holds about 56 percent of fully diluted equity at seed and about 36 percent by Series A, according to Carta’s 2026 founder ownership data, so the more rounds a company raises, the more complex the allocation becomes.

Driver 6: Market Conditions and Timing

Even a strong company is valued within a market. Interest rates, public market multiples, and investor appetite change how much buyers will pay for growth. The data shows how much that environment shifts: Carta reported that just over 19 percent of new rounds closed in Q1 2025 were down rounds, while median seed valuations reached about $24.3 million by mid-2026, with median dilution at roughly 18 percent. Good companies can face very different pricing depending on timing.

How These Drivers Show Up in a 409A

For companies issuing stock options, an independent 409A appraisal estimates the fair market value of common stock. Under IRS rules, an independent appraisal is generally presumed reasonable for up to 12 months, unless a material event, such as a new financing round or major contract, changes the company’s value. The valuation draws on every driver above: growth, margins, risk, market multiples, capital structure, and marketability. Documentation of those assumptions is what makes the result defensible to auditors and investors.

Conclusion

Value in a growing private company comes from durable growth, healthy unit economics, a strong market position, manageable risk, and a capital structure that allocates value fairly. Understanding these drivers helps founders negotiate, plan equity, and prepare for diligence. When it is time to price options, qualified 409A valuation services can translate those drivers into a defensible, audit-ready number.

Sharp 409A is a valuation firm founded in 2014, specializing in 409A valuations for startups with complex capital structures. Using proprietary OPM, PWERM, and hybrid models alongside experienced CFA and FRM professionals, they deliver audit-ready reports quickly and cost-effectively.