Why Series A/B Startups Need to Treat Marketing Like a Growth Engine
Brilliant founders raise millions, build products people love, and then hit a wall when they try to scale. The answer often sits right in front of them: they haven’t invested in marketing like it’s part of the business model.
By the time a company hits Series A or B, the product isn’t the only thing that needs to work. Marketing needs to pull its weight too.
Marketing Problems Kill 29% of Startups
Marketing problems are the second most common reason startups fail, at 29%, nearly as high as running out of cash. A company can have funding, product-market fit, and a solid team, but without clear communication of value or a memorable brand, it remains vulnerable. Series A and B companies often treat marketing like something to address once the product is perfect or the team is bigger. Waiting puts them behind.
What Changes Between Seed and Series A
At seed stage, startups experiment with messaging, try different channels, and figure out who cares about what they built. By Series A, the game shifts. Companies have proven traction and need to scale it.
According to 2025 benchmarks, seed-stage startups spend 10-20% of funding on marketing while Series A companies allocate 25-40% to growth campaigns. The increase reflects what works when scaling revenue.
Series A companies that allocate at least 30% of funding to growth marketing see 40% faster revenue scaling compared to those spending under 20%. Startups won’t scale what they refuse to fund.
The Real Cost of Getting Marketing Wrong
Marketing efficiency numbers reveal an uncomfortable trend. The median sales and marketing multiple for 2025 was about 3x, meaning startups spent $150K on marketing and generated $450K in revenue.
That sounds reasonable until compared to the 2024 benchmark of 6x. SaaS businesses are generating half the revenue with the same marketing spend. This points to a strategy problem, not a product problem.
When marketing doesn’t work, everything else suffers. Burn rate climbs, runway shortens, and investors ask harder questions.
For women founders, the stakes are even higher. Companies founded solely by women secured roughly 2% of all US VC funding in recent years. Strategic marketing becomes the difference between being seen and being overlooked.
What Series A/B Founders Should Actually Prioritize
The solution isn’t throwing money at ads and hoping for results. Building marketing requires the same approach as building product: intention, testing, and a clear plan.
What works at this stage:
- Invest in brand positioning, not just performance marketing
Companies need people to remember them. This means defining voice, story, and differentiation. Performance marketing generates clicks, but brand positioning builds loyalty.
- Build a content engine that compounds
One-off campaigns don’t scale. A content strategy that educates, builds trust, and establishes authority compounds over time.
- Hire or partner with people who know what they’re doing
Engineers don’t build brands and CFOs don’t write messaging. Companies need to bring in people who understand marketing as a discipline.
- Track what matters, not just what’s easy
Vanity metrics feel good but don’t move the business. Customer acquisition cost, lifetime value, and marketing’s contribution to revenue matter more.
- Align marketing with your funding goals
Investors examine burn multiples and want to see efficiency. Marketing that drives predictable pipeline and sustainable growth signals fundability. Guesswork signals risk.
Marketing Is Infrastructure, Not an Afterthought
Founders who wait until they’re desperate to invest in marketing end up playing catch-up in markets that have moved on. Companies that scale treat marketing like infrastructure, building it early, investing consistently, and measuring rigorously.
For companies at Series A or B where marketing still feels like an experiment, the approach needs to change. Product gets companies funded. Marketing gets them to the next round.