What Is Series Funding A, B, and C?

What Is Series A, B, and C Funding?

Series A, B, and C are funding rounds that generally follow the stages of “seed funding” and “angel investing,” providing outside investors the opportunity to buy equity or partial ownership of a new company. Each series is a separate fundraising event. The terms come from the series of stock being issued by the capital-seeking company.

How Series A, B, and C Funding Rounds Work

Before exploring how a round of funding works, it’s necessary to identify the different participants. First, there are the individuals hoping to gain funding for a new business. Businesses tend to advance through funding rounds; it’s common for a company to begin with a seed round and continue with A, B, and C funding rounds.

On the other side are potential investors. While investors wish for businesses to succeed because they support entrepreneurship and believe in the aims and causes of those businesses, they also hope to gain a return from their investment.

For this reason, nearly all investments made during developmental funding require the investor or investing company to retain partial ownership of the company they are funding. If the company grows and earns a profit, the investor will receive a share of the rewards.

Series Funding and Funding Valuation

Before any round of funding begins, analysts undertake a valuation of the company in question. Valuations are derived from many factors, including management, growth expectations, projections, capital structure, market size, and risk.

Investors each have their own method for valuating a business, but many use some of the same factors:

• Market size: The size of the market that the company is in, in dollar value
• Market share: How much of the market the company takes up, like 0.10% of the overall market
• Revenue: An estimate of how much the company made and will make. This is market size multiplied by market share.
• Multiple: An estimate used by the investor to give them an idea of the business’s value, like 10x or 12x the revenue.
• Return: The increase in value, as a percentage of the money invested, based on estimates of growth in market share, market size, and revenue.

Pre-Seed Funding

The earliest stage of funding a new company comes so early in the process that it is not generally included in the funding rounds. Known as “pre-seed” funding, this stage typically refers to when a company’s founders get their operations off the ground. The most common “pre-seed” funders are the founders, close friends, supporters, and family.

Depending upon the nature of the company and the initial costs of developing the business idea, this funding stage can happen very quickly or take a long time. It’s also likely that investors at this stage are not investing in exchange for equity in the company.

Seed Funding

Seed funding is the first official equity funding stage. It typically represents the first official money a business venture or enterprise raises. Some companies never extend beyond seed funding into Series A rounds or beyond.

Seed funding helps a company finance its first steps, including market research and product development. With seed funding, a company has assistance in determining what its final products will be and who its target demographic is. Seed funding is generally used to employ a founding team to complete these tasks.

What Is Series A Funding?

The first round after the seed stage is Series A funding. The term gets its name from the preferred stock sold to investors at this stage. In this round, it’s important to have a plan for developing a business model that will generate long-term profit.

Typically, Series A rounds raise between $2 million and $15 million, but this number varies due to many circumstances. In January 2025, the average Series A round raised $16.6 million.

In Series A funding, investors are not just looking for great ideas. Rather, they are looking for companies with great ideas and a strong strategy for turning that idea into a successful, money-making business. For this reason, it’s common for firms going through Series A funding rounds to be valued (pre-money) at up to $50 million.

The investors involved in the Series A round tend to come from venture capital firms. Well-known venture capital firms that participate in Series A funding include Sequoia Capital, IDG Capital, Google Ventures, and Intel Capital.

How Series A Funding Works

By this stage, it’s also common for investors to take part in a somewhat more political process. It’s common for a few venture capital firms to lead the pack. In fact, a single investor may serve as an “anchor.” Once a company has secured a first investor, it may find it easier to attract additional investors as well. Angel investors also invest at this stage but tend to have much less influence in this funding round than in the seed funding stage.

It is increasingly common for companies to use equity crowdfunding to generate capital as part of a Series A funding round. Part of the reason for this is the reality that many companies, even those that have successfully generated seed funding, tend to fail to develop interest among investors as part of a Series A funding effort. Indeed, fewer than 10% of seed-funded companies will go on to raise Series A funds as well.

What Is Series B Funding?

Series B rounds are about taking businesses to the next level, past the development stage. Investors help startups get there by expanding market reach. Companies that have gone through seed and Series A funding rounds have already developed substantial user bases and have proven to investors that they are prepared for success on a larger scale. Series B funding is used to grow the company so that it can meet these levels of demand.

How Series B Funding Works

Companies undergoing a Series B funding round are well-established, and their valuations tend to reflect that; Series B companies had a median valuation of $35 million in 2022 and an average of $51 million. According to Fundz, the average funding size had not substantially changed from this at the start of 2024.

Series B appears similar to Series A regarding the processes and key players. Series B is often led by many of the same characters as the earlier round, including a key anchor investor that helps to draw in other investors. The difference with Series B is the addition of a new wave of other venture capital firms specializing in later-stage investing.

What Is Series C Funding?

Businesses that raise Series C funding are already quite successful. These companies look for additional funding to help them develop new products, expand into new markets, or even acquire other companies. In Series C rounds, investors inject capital into successful businesses in an effort to receive more than double that amount back. Series C funding focuses on scaling the company, growing as quickly and successfully as possible.

One possible way to scale a company could be to acquire another company. Imagine a startup focused on creating vegetarian alternatives to meat products. If this company reaches a Series C funding round, it has likely already shown unprecedented success in selling its products in the United States. Through market research and business planning, investors may reasonably believe the company would do well in Europe.

Perhaps this vegetarian startup has a competitor with a large market share and a competitive advantage. The culture appears to fit well, as investors and founders both believe the merger would be a synergistic partnership. In this case, Series C funding could be used to buy another company. As the operation gets less risky, more investors come to play.

How Series C Funding Works

In Series C, groups such as hedge funds, investment banks, private equity firms, and large secondary market groups accompany the type of investors mentioned above. The reason for this is that the company has already proven itself to have a successful business model. These new investors come to the table expecting to invest significant sums of money to secure their positions as business leaders.

Many companies end their external equity funding with Series C, while others go on to raise Series D, E, or even later rounds. For the most part, companies gaining up to hundreds of millions of dollars in funding through Series C rounds are prepared to continue developing globally.

Many of these companies utilize Series C funding to help boost valuations in anticipation of an IPO. At this point, companies have higher valuations. Companies engaging in Series C funding should have established strong customer bases, revenue streams, and histories of growth.

Downsides to Series Fundings

Though successive rounds of series funding can provide a company with the capital it needs to grow, they also come with some downsides. Those downsides may slightly vary by funding round, so the following limitations have been broken out by round. Note that some of these limitations may cross over between rounds.

Limitations of Series A Funding

• Dilution of Ownership: Founders often give up a significant portion of their ownership in exchange for capital. This dilution can reduce their control over the company, and this is the first time the initial owners of the company may experience this.
• Increased Expectations: Investors in Series A rounds typically expect rapid growth and significant progress. This can put pressure on the startup to meet aggressive targets.
• Loss of Autonomy: Investors may demand a say in business decisions, adding external influence on the company’s direction and strategy. Whereas a company was more largely autonomous before, it now may have to take some direction from external parties.
• Early Financial Burden: Although it’s an infusion of capital, there might be an increased financial burden to meet investor expectations and demonstrate growth. This is especially true for Series A, where risk is often highest (meaning investors expect rewards to also be highest).

Limitations of Series B Funding

• Further Dilution: As with Series A, Series B funding usually involves giving up more equity, further diluting the founders’ stakes. This also poses potential threats to existing owners from prior rounds.
• Pressure to Scale: As with Series A, Series B investors expect the company to scale significantly. This can lead to pressure on the company to expand rapidly. Note that some investors at this point may be tepid at the fact that the company may be asking for more capital without having made substantial progress as hoped or expected.
• Higher Stakeholder Expectations: The involvement of more sophisticated investors means higher expectations for governance, reporting, and performance metrics. This is more true in Series B funding where multiple rounds of capital have been achieved and operational expectations have been set.

Limitations of Series C Funding

• Significant Dilution: By the time a company reaches Series C, founders might have given up a substantial amount of ownership, significantly diluting their control.
• Intense Growth Pressure: Series C funding is often used for scaling operations on a global level, which brings even more immense pressure to achieve high growth rates.
• Exit Strategy Focus: Investors at this stage are often looking for a clear path to exit, such as an IPO or acquisition. This can push the company towards decisions that favor short-term gains over long-term sustainability.
• Cultural Shifts: As the company grows, maintaining the original startup culture becomes challenging. This is especially true if the company is now targeting an IPO and must manage public stock price expectations.

Example of Series Funding

Aisles, an AI-driven retail tech company, closed its Series A funding round in May 2024, bringing in $30 million. This funding was intended to help Aisles push forward with their goal of changing the shopping experience using cutting-edge AI.

Leading venture capital firms and investors participated in the round, though specific firms were not mentioned in the official news release. It was noted that the new funds will speed up the development of their AI tools, like advanced navigation, biometric security, and personalized shopping assistance, making shopping smoother and safer for everyone.

Aisles already has over one million active users and makes over $15 million in net profit each year. However, Johnny Saephan, the Chief Administrative Officer, highlighted how crucial this funding is for growth in AI capabilities, team expansion, and entering new markets. Chairman Jesus Ortiz Paz also emphasized the team’s dedication to their long-term vision and innovation in retail.

Alternatives to Series A, B, and C Funding

If Series A, B, or C funding doesn’t quite sound like the right fit for your company, you do have many other options to raise capital. Note that most of these options can be used in conjunction with private offerings.

• Bootstrapping: Bootstrapping involves using personal savings, revenue from the business, or support from friends and family to fund a startup. Very generally speaking, this is usually how companies get their initial start.
• Crowdfunding: Crowdfunding raises small amounts of money from a large number of people through platforms like Kickstarter, Indiegogo, or GoFundMe. This method can validate the product idea and build a customer base without equity dilution since crowdfunded capital is not tied to share or equity offerings.
• Revenue-Based Financing: Revenue-based financing involves selling a percentage of future revenue to investors for immediate funds. This option avoids equity dilution and offers flexible repayment tied to revenue. However, it can be expensive if the company grows rapidly, and some companies won’t even have this as an option if it has unpredictable revenue streams.
• Bank Loans and Lines of Credit: If equity isn’t preferred, traditional debt financing through bank loans or lines of credit provides capital without equity dilution. Note that debt may have a higher cost of capital than equity offerings.
• Corporate Venture Capital: Corporate venture capital involves large corporations investing in startups for strategic reasons rather than purely financial returns. Though this largely mimics what a series funding may look like, the dynamics may be different as the corporation may look to provide more expertise or resources compared to more traditional private equity offerings.

Explain Like I’m Five

New companies may need to operate at a loss for several years before they make a profit. To help their company grow, business owners hold funding rounds to raise capital from investors. Each investor buys a stake in the company, hoping it will gain value as the business grows.

Series A, B, and C are the names of funding rounds used to raise investments. Some companies go on to a Series D round or beyond. With each successive round, the business should be larger and less risky than the last, allowing it to raise more capital from investors.

The Bottom Line 

Understanding the distinction between these rounds of raising capital will help you decipher startup news and evaluate entrepreneurial prospects. The different funding rounds operate in essentially the same basic manner: Investors offer cash in return for an equity stake in the business. Between the rounds, investors make slightly different demands on the startup.

Company profiles differ with each case, but generally possess different risk profiles and maturity levels at each funding stage. Nevertheless, seed and Series A, B, and C investors all help ideas come to fruition. Series funding enables investors to support entrepreneurs with the proper funds to carry out their dreams, perhaps eventually cashing out together in an IPO.