The Difference Between Seed funding and Series A, B, C Funding

Anton Ioffe - October 29th 2023 - 6 minutes read

Navigating the labyrinth of startup financing can be a daunting journey. Understanding the various funding stages from seed to Series A, B, C, and even D is crucial for entrepreneurs aiming to propel their ventures to new heights. This comprehensive guide unravels the intricate threads of these funding rounds, providing insights into the roles of participants, the level of investments, the expected trajectories, and the nuances between each round. Embark on this enlightening journey to decode the complexities of startup fundraising and bolster your knowledge to secure the capital you need for every growth phase of your business. So, are you ready to explore the fascinating world of funding rounds?

Demystifying Seed Funding

Seed funding presents the first official equity funding stage for a startup. It represents the first formalized money injection that a business raises, with the funding amount varying from mere tens of thousands to several million dollars. Potential benefactors at this stage are diverse, ranging from the founders themselves, friends and family, to venture capitalists and angel investors. Although applying for such funds might seem daunting, it is often about networking and communicating the passion behind the venture effectively. A successful seed round can catalyze the proliferation of the company, experiment with its business model and perfect the minimum viable product. It undertakes a critical task — to fuel the nascent stages of a startup, resembling the role of water to a plant seed.

The average investment in a seed funding round can fluctuate significantly. It is contingent on factors such as the proficiency of the founders, the nature of the business, and the extent of the opportunity. The startup may give up equity in the range of 10% to 25% during this stage. It is crucial to note that acquiring seed funding is strongly centered around realizing the potential of the venture and capitalizing on the preliminary market response. Despite the inherent risks due to the lack of financial track records or tangible outcomes, seed funding forms the bedrock on which future funding rounds, such as Series A, B, and beyond, can build.

To qualify for seed funding, your business must demonstrate more growth than its pre-seed stage. With the establishment of some traction and the advent of a clear plan to expand, a startup can solicit seed funding. Often used to fund initial product development, augment the founding team, and carry out market research, seed funding paves the way for scaling operations. It is a validation of the market's acceptance and a precursor to attracting investment in subsequent stages. Thus, acquisition of seed funding is a notable milestone in a startup’s journey, symbolizing the feasibility and legitimacy of its vision.

Unveiling the Series A Funding Round

In essence, Series A funding, also known as Series A financing or Series A investment, marks the early stage venture capital funding, following the startup's seed round. Unlike seed funding, this capital injection is typically larger in volume and more challenging to secure. According to multiple reports, less than 10% of companies successfully transition from seed to Series A funding, signalling its high-stake nature. This round additionally ushers in the era of preferred stocks, following the common stocks issued during the seed round, offering promising runway for startups to hone their products, build their team, and kickstart the go-to-market strategy.

The process of Series A funding involves investing in a privately held startup showcasing notable growth and a well-developed business model. Expectations are high at this juncture, with investors keen on a clear path towards further growth and revenue generation. The brilliance of an idea or the potential of a business plan alone isn't sufficient to attract investment in this round. Instead, startups must demonstrate the product's scalability across diverse markets, along with a well-conceived strategy to capture and sustain a healthy market share in the long run. Realistically, a startup should be able to illustrate a solid vision for its future success and profitability to draw in investment at the Series A stage.

Well-respected venture capital firms such as Sequoia Capital, Google Ventures, or Intel Capital often engage in Series A funding. This stage also witnesses the participation of some angel investors, albeit with less influence than in the seed stage. Moreover, it's typical for one or a few venture capital firms to emerge as leaders during this funding phase. A startup that secures a primary investor usually finds it easier to attract more investment, building off this initial momentum. Thus, Series A funding denotes the initiation of an upward journey for startups that have successfully graduated from seed funding to more consolidated investments, projecting them onto an increasingly complex financial trajectory.

Series B Funding Round: The Scaling-up Phase

The Series B funding round signifies a crucial phase for startups, as they mature from budding ventures into established businesses poised for expansion. This phase occurs once the company has demonstrated substantial growth, validated product-market fit, and outlined a clear trajectory to profitability. The prime objective at this stage is aggressive expansion, propelled by significant capital injections which largely cater to scaling operations, developing robust marketing strategies, and consolidating the apt technology. Funding in this phase often ascends to millions of dollars, with an average figure somewhere around $33 million.

At this juncture, the investor pool comprises primarily of venture capitalists and institutional investors, alongside corporate venture capital firms and strategic investors. Venture capital firms specializing in late-stage investments may also contribute in this round. Existing investors from the Series A round often continue their financial support as their vested interests align seamlessly with the startup's upward momentum. The constant positive trend in key performance indicators, such as revenue and customer acquisition, as well as the successful attainment of specific growth goals, tend to make raising money easier at this stage.

The Series B funding plays a key role in expanding market reach, meeting higher demand levels, and fostering a robust infrastructure to sustain that growth. The funds are generally funneled into areas like business development, advertising, enhancing the workforce, and infusing new technologies to support growth. During this phase, startups are poised to elevate their business to the next level, having already secured a substantial user base and proven their potential at a larger scale in the previous funding rounds. Thus, this phase holds paramount importance in the startup's journey to become lucrative, high-functioning ventures with lucrative returns on investment.

Unveiling the Series C and D Funding Stages: Accelerated Growth and Expansion

Startups with proven success and established market positions typically access Series C funding for scaling up operations, expanding into new markets, or developing new products. Series C funding is highly substantial, sourced from major financial institutions including banks, hedge funds, and private equity firms. The company at this stage has a clear product and operational method, resulting in increasing interest from these significant investors. A key distinction making Series C financing unique from previous rounds is that it generally operates as the last funding round for startups. Upon successful funding, companies generally find themselves in a position to self-sustain growth, have an exit strategy in place, or structure an initial public offering (IPO).

However, there's also a possibility of Series D funding, a stage fewer startups venture into. Occurring post the seed stage, after Series A, B, and C, usually startups have substantial reasons to look for a Series D round. This could occur if a company has not met their business goals following the previous funding rounds or in the case where a new expansion opportunity unfolds, necessitating additional capital. Often, Series D funding is leveraged for new market penetration, investment in long-term projects, or for preparing for an anticipated IPO.

Without doubt, the dynamics of Series C and D funding differentiate these rounds from the startups' earlier stages. The seed round and Series A and B provided resources crucial for scaling the businesses, while the later stage rounds support not just growth, but the preparation for an exit or acquisition. The ability to understand the subtle nuances between these rounds is imperative for interpreting startup news, evaluating entrepreneurial prospects, and for startups planning their business journey and funding strategy. Although the underlying principle across all rounds involves investors offering capital in return for equity, between the rounds, the types of investors and their demands on the startup vary significantly.


This article explores the differences between seed funding and series A, B, C funding rounds in the startup world. Seed funding is the initial stage where a startup raises its first formalized money injection, often from a variety of sources, to fuel the early stages of the business. Series A funding follows, typically larger in volume and more difficult to secure, requiring startups to demonstrate growth and a well-developed business model. Series B funding focuses on scaling up operations and aggressive expansion, while Series C funding is for established startups looking to further scale, and Series D funding is less common and usually for specific needs or preparing for an exit. Understanding these funding rounds is crucial for entrepreneurs seeking capital for different stages of their business growth.