How Is a Series B Company Valued?
A Series B company is valued on a forward revenue multiple, most often 8 to 15 times next-twelve-months ARR in 2026, moved up or down by growth rate, net revenue retention, and gross margin. Take your forward ARR, apply the multiple your growth and retention earn, and that number is your enterprise value before the negotiation starts. A company growing 100 percent a year at 120 percent net retention sits at the top of that range or above it. A company growing 40 percent with churn dragging retention below 100 percent sits at the bottom, or gets priced on a discounted cash flow instead.
Why founders get this wrong
The common mistake is anchoring on a comparable that no longer applies. A founder reads that a rival raised at 25 times ARR in 2021 and walks into the room expecting the same. That number is gone. Software multiples reset hard, and by 2026 the median Series B prices closer to 10 times forward revenue, not 25 times trailing. Anchoring on the peak makes every term sheet look like an insult and burns weeks of a raise arguing about a number the market will not pay.
The second mistake is selling growth and ignoring efficiency. In 2021 a board would fund growth at almost any burn. Now the first question after growth rate is the burn multiple: how many dollars you spent to add one dollar of net new ARR. A company adding 5 million dollars of ARR while burning 15 million has a burn multiple of 3, and that caps the valuation no matter how fast the top line moves. Growth gets you in the room. Efficient growth sets the price.
The framework I use with clients
A Series B valuation is built in four steps, in this order. Each step either earns or loses part of the multiple the step before it set.
- Start with forward ARR, not trailing. Investors price the next twelve months, not the last twelve. Build a bottom-up forecast you can defend line by line: current ARR, contracted expansion, pipeline weighted by real close rates, and churn. A company at 8 million dollars today with a credible path to 16 million in a year is valued off the 16, discounted for how believable the forecast is. A forecast you cannot back with pipeline gets marked down to trailing revenue.
- Set the base multiple from growth and retention. Map your growth rate and net revenue retention to the range. Above 80 percent growth and above 115 percent retention earns 12 to 15 times forward ARR. The 40 to 60 percent growth band with retention around 100 percent lands at 8 to 10. Below that you are no longer a multiple story, you are a discounted cash flow, and the number drops fast. Retention is the swing factor: it is the proof that the growth compounds.
- Adjust for efficiency and margin. Take the base multiple and move it on two numbers. Gross margin above 75 percent holds the multiple, below 65 percent cuts it because less of every revenue dollar is real. Burn multiple under 1.5 adds a premium, above 3 caps the price. This is the step that separated the 2021 market from 2026: efficiency now has its own line in the valuation alongside growth.
- Pressure-test against real comparables. Anchor the output on Series B rounds that closed in the last two quarters in your category, not headline rounds from the peak. Three to five recent, real comparables at your growth and margin profile are worth more than any formula. If your derived number sits far outside that cluster, the forecast or the multiple is wrong, and diligence will find it before you do.
| Driver | The trap | The threshold that works |
|---|---|---|
| Revenue base | Value off trailing ARR | Value off defensible forward ARR |
| Multiple | Anchor on 2021 peak comparables | 8 to 15 times forward ARR, median near 10 |
| Retention | Lead with logo growth | Net revenue retention above 110 percent |
| Efficiency | Sell growth at any burn | Burn multiple under 1.5 |
| Margin | Report revenue, hide margin | Gross margin above 75 percent |
From my operating seat
When I sold my last company, the valuation held up in diligence for one reason: every number in the forecast had a source a buyer could check. We were not selling a story about the market, we were showing contracted expansion, real close rates, and a retention curve that proved customers stayed and spent more. That is what let us defend the multiple when the questions got hard. The rounds I have watched fall apart were the ones built on a forecast nobody could back once diligence started pulling on it.
I run this exact build with the founders I advise before they open a Series B. We start with the forward model, tie every line to pipeline and contracts, then stress the growth, retention, and burn until the number stops moving. In one case a founder wanted to raise at 14 times ARR on the strength of a fast growth rate, and the retention curve underneath it was barely 98 percent. The honest number was closer to 9 times, and walking in with that, plus a clean burn multiple and a defensible forecast, got the round done at a price that held. Across NYC, London, and Dubai the pattern repeats: the valuation you can prove beats the valuation you want, because the one you can prove is the one that survives the term sheet.
What revenue multiple do Series B investors use in 2026?
Most Series B software rounds in 2026 price at 8 to 15 times forward ARR, with the median closer to 10. The multiple is a scorecard, not a fixed number. Growth above 80 percent a year, net revenue retention above 115 percent, and gross margin above 75 percent push you toward the top. Slowing growth, retention below 100 percent, or a burn multiple above 3 pull you to the floor. Efficiency now carries as much weight as growth.
What metrics drive a Series B valuation the most?
Four numbers move the price more than any narrative: growth rate, net revenue retention, gross margin, and burn multiple. Retention is the one founders underweight and investors weight most, because retention above 110 percent means the company grows even with no new logos, and that compounding is what a multiple pays for. Growth sets the ceiling, retention proves it is durable, and burn multiple shows whether the growth was bought cheaply or expensively.
How do I defend a Series B valuation in a down market?
In a soft market you defend price with efficiency, not growth alone. Walk in with a burn multiple under 1.5, retention above 110 percent, and a clear path to default-alive, and you argue for a premium while the market marks others down. If the numbers will not support your last valuation, a structured flat round beats a headline down round that resets your option pool and signals weakness to staff and customers. Price on what you can prove, not the number you want to protect.
Build a Series B number that survives the term sheet
This is the exact problem I advise on: building the forward model, tying every line to pipeline and contracts, and stress-testing growth, retention, and burn until the valuation holds under diligence. If your number is a comparable and a hope, the round will find the gap. See more about how I work as a fractional CFO or book a call.
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