Why the co-founder assumption is killing your startup

Executive overview

Most startups fail, and co-founders are the leading cause. The industry treats co-founding as a prerequisite, but that belief stops good companies from starting and causes others to implode once they do.

Solo founding is rising — for the first time, more than one in three new companies are started solo. The tailwind isn't just AI; it's the slow collapse of the assumption that you need a partner to be taken seriously.

The default is shifting from co-founder to solo founder — and the companies that thrive will be those built around the founder's actual shape, not the factory template.

The co-founder problem

• Most startup failures involve co-founders; people track the successes, not the failures — denominator delusion
• A co-founder of convenience is often worse than no co-founder: you spend years, the relationship implodes, the company dies
• Co-founder doom loops are real: when both founders lose hope, each drags the other down
• The bar for a co-founder should be extremely high; a truly great one is an asset, a forced one is a liability
• Solo founders often have a co-founder-shaped hole — worth acknowledging, not pretending it doesn't exist

Why solo founding is rising

• Solo founding crossed one-in-three new companies in 2025, up from under 25% five years earlier
• AI gives individuals leverage that previously required a team
• Normalization compounds: every visible solo founder makes the next one more likely
• The real constraint was never technology — it was the belief that solo founding wasn't legitimate

Three types of solo founders

1. True solo — no human teammates, full AI orchestration (e.g. Pulsia: $6M ARR, one person)
2. Free solo — bootstrapped with a small team, no outside capital (e.g. Chatbase: $9M ARR over three years)
3. Juiced solo — raised capital while remaining the sole founder

The factory model and why to reject it

• The factory is the industry's default playbook: raise early, hire fast, demo day, co-founder required
• Factory drives median outcomes; the median company is a dead company
• Successful companies look different from each other; failed companies look the same
• Founders walk into the factory themselves — no one forces them; that makes it harder to escape
• Demo day is another factory mechanism: it imposes fundraising timing regardless of whether it's right for the business
• The question to ask before hiring: "Do I actually need to hire, or am I just lonely?"

The shape of the business

• Every successful company has a different shape; optimise for that, not for the VC template
• VCs investing for fund IRR have incentives misaligned with what's right for a specific company
• Taking money is a commitment to a specific type of outcome — know what you're signing up for
• A $2M check from a $2B AUM fund means nothing to that fund; your company is a lottery ticket, not a portfolio priority
• Seed-strapping — taking a small amount to preserve runway without the full VC treadmill — is underused

Managing hope as a solo founder

• Companies run out of hope long before they run out of money
• Managing your own hope is hard; managing someone else's is harder
• The best support comes from people with enough context to understand what you're doing but not so much that they wallow in it with you
• Bad VCs tell struggling founders to shut down; great VCs back the founder, not just the investment thesis
• A VC who was themselves a founder is more likely to support through the hard moments

Bear case: why solo founding is hard

• No co-founder means no one to hold you accountable on bad mornings
• The best co-founder relationships are positive competitions — each person trying to outperform the other for shared benefit
• External life events hit harder when there's no internal support structure
• You will have a co-founder-shaped hole; it is surmountable, but it is real
• Solo founding is hard mode — go in knowing that

Bull case: why to go solo

• Build something that is truly one-of-one, shaped entirely by your own perspective
• No need to recruit co-founders before you've validated anything — just start
• Two-layer org structure (founder → founding team) gives the team more authorship and proximity than the three-layer structure co-founders create
• Equity available to early employees is meaningfully larger when there's no co-founder dilution
• The company only dies if you do — you control the hope

Solo together vs. solo alone

• Being solo alone is the worst version; being solo together is the point
• The Solo Founders program: 10 founders per cohort, three months in San Francisco, $100K investment
• The $100K threshold was chosen partly for immigration purposes — roughly half of applicants are international founders
• Community creates the marathon effect: you push harder when surrounded by others pushing themselves
• Founders need blunt feedback from people who care — not cheerleading, not cruelty