The Funding Series · Part 5 of 7
Series B Funding: What It Is, What Investors Want, and How to Raise It
Series B funds scale: expanding a proven engine into new markets, segments and products. Here is what investors underwrite at this stage, and what belongs in a Series B pitch deck.
In this guide
By Series B, the existential questions are behind you. You have a product people want, an engine that reliably turns spend into customers who stay, and economics that work. Series B is not about discovery. It is about scale: taking a machine that already runs and building it far larger, across new markets, segments and products. Investors at this stage are not asking whether the business works. They are asking how big and how durable it can become.
It is the fourth rung in our complete guide to startup funding, and it follows the repeatable growth engine you proved at Series A.
What Series B is actually for
Series B funds expansion. The engine works; this round pays to widen it: new geographies, new customer segments, new product lines, a larger go-to-market organisation, sometimes strategic acquisitions. Rounds typically start around 15 million dollars and can run much larger, because the scale of ambition, and of spend, has stepped up. Carta puts the median US Series B pre-money valuation near 119 million dollars, and interestingly, dilution at this stage has fallen to around 13%, lower than at seed or Series A, because by Series B a strong company has the leverage to raise more while giving up less. In Africa, Series B rounds remain rare: most of the continent’s largest 2025 rounds were concentrated in a handful of late-stage deals.
The strategic shift is from finding growth to compounding it. A Series A company proves a channel works. A Series B company proves that channel, and several others, can be run at scale by a real organisation, in more than one market, without the economics falling apart. The risk investors are underwriting is no longer “will it work?” but “will it keep working as it gets big?”
What Series B investors look for
The bar is efficiency and durability at scale.
Economics that hold or improve with size. The most powerful Series B signal is unit economics that get better as you grow: acquisition cost falling, margins widening, customers staying longer. It shows real advantages, brand, network effects, operating leverage, rather than growth propped up by ever-increasing spend.
Durable retention. At scale, retention is destiny. Investors examine mature cohorts to see whether customers from a year or two ago are still there and still spending. Strong net revenue retention, existing customers growing in value, is worth more than almost any new-customer number.
A large, reachable market and a path to leadership. Series B investors are underwriting a potential category leader. They want to see that the market is genuinely large and that you have a credible route to a leading share of it.
A path to profitability. The era of growth at any cost has narrowed. You need not be profitable, but you need economics that improve with scale and a believable path to profit. “Spend more, worry later” is a hard sell now.
A management team, not just founders. Running a company at Series B scale needs real leaders across functions. Investors look for a team that can build and run a much larger organisation, and for founders who have grown into running a company rather than a project.
What belongs in a Series B pitch deck
The Series B deck is a scale story, backed by mature data.
- Cover and positioning. Who you are and the category you intend to lead.
- The story so far. A brief arc from problem to the proven engine you have built, evidenced by metrics.
- Traction at scale. Revenue growth, but now with maturity: multi-year cohorts, retention curves that hold, growth across more than one channel or market.
- Unit economics over time. The key slide. Show economics improving with scale: falling acquisition cost, widening margins, rising customer value. Trend matters more than any single figure.
- Market and path to leadership. The size of the opportunity and your credible route to a leading position within it.
- Expansion plan. Exactly what the money funds: which markets, segments or products, and why each is the right next move, with evidence where you have it.
- Go-to-market at scale. The engine as an organisation: multiple working channels and the machine that runs them.
- Competition and moat. Why your position strengthens as you grow, not weakens.
- Team and organisation. The leadership that will run the larger company, and the senior hires this round funds.
- Financials and the ask. Detailed projections, the path to profitability, the raise, and the specific scale milestones it unlocks.
Every slide should answer the Series B question: does this keep working, and get stronger, as it gets bigger?
Common Series B mistakes
- Confusing scale with growth. Raw growth is not enough at Series B; efficient, durable growth is. Investors look at whether the economics improve as you scale.
- A vague expansion plan. “We will expand across Africa” is not a plan. Which markets, in what order, at what cost, with what evidence?
- No path to profitability. Strong economics with no route to profit is a much weaker story than it was a few years ago.
- A founder-shaped company. If everything still runs through the founders, investors doubt it can scale. Show the leadership bench.
The African angle
Series B remains relatively rare on the continent, which cuts two ways. The scarcity of later-stage capital means African companies must often reach Series B with stronger fundamentals than peers elsewhere, real economics, genuine efficiency, because there is less patient capital to paper over weakness. But that same scarcity means a company that does reach an efficient, scaling Series B is genuinely distinctive. At this scale, expansion often means new countries, each with its own currency, regulation and payment rails, so the currency discipline and working capital management that mattered earlier become multi-market challenges. The companies that handle them are the ones laying the foundation to become the continent’s category leaders.
What comes next
Beyond Series B lie later rounds, Series C and onward, and eventually the outcomes that repay the whole journey: acquisition, or a public listing. But those are variations on the same theme you have now mastered: raise against a milestone, prove it with numbers, and give up only the ownership the progress justifies.
If this series has a single thread, it is that. Each stage funds a specific proof, and the founders who raise well are the ones who always know exactly which proof they are buying. Start at the beginning with the complete guide, and make sure you know the three numbers investors check first before any conversation.
FAQ
Frequently asked questions
How much do you raise at Series B?
Typically 15 million dollars and up, sometimes far more. Series B rounds are still relatively rare in African markets, though the number is growing as more companies reach the scale and economics the stage requires.
What do Series B investors look for?
Durable, efficient growth at scale: unit economics that hold or improve as you get bigger, strong retention, a large and reachable market, a credible path to market leadership and eventual profitability, and a management team capable of running a much larger organisation.
How is Series B different from Series A?
Series A proves you have a repeatable growth engine. Series B proves that engine scales efficiently, and funds expansion into new markets, segments or products. The focus shifts from "does the model work?" to "how large and how durable can this become?"
Do you need to be profitable to raise Series B?
Not always, but you need a credible path to it and economics that improve with scale. Investors will accept continued investment in growth if the unit economics are strong and getting stronger, but "grow at any cost with no path to profit" is a much harder story to fund at Series B than it once was.
