When Giants Don’t Go Public: Inside the $5 Trillion Private Tech Market

What It Covers

David George, general partner at a16z running their growth fund, explains why $5 trillion in private tech market cap now equals nearly 25% of the S&P 500, how companies like Stripe, SpaceX, and OpenAI stay private longer, and why outcome-based pricing may permanently disadvantage legacy software incumbents.

Key Questions Answered

• •Private market value shift: Ten years ago, 88% of market cap creation for top tech companies happened post-IPO in public markets. For recent IPOs, 55% of value was created while still private. Investors seeking hypergrowth exposure — defined as 30%+ annual growth — will find only three qualifying companies in public markets today versus dozens privately.
• •SPV risk management: Founders at companies like Anduril actively reject SPV investors because these vehicles obscure who actually sits on the cap table. When evaluating growth-stage investors, founders should demand direct fund investment rather than assembled single-company vehicles, which concentrate risk and misrepresent capital sources during due diligence conversations.
• •Employee liquidity mechanics: Private companies running twice-yearly tender offers — SpaceX being the primary model — allow employees to sell roughly 25% of vested shares at set prices. This structure approximates public RSU dynamics without stock volatility, making it a viable retention tool when competing against Meta or Alphabet's quarterly net-stock deposits.
• •Legacy software vulnerability: Net dollar retention across incumbent SaaS companies has declined steadily since 2021 as enterprise budgets shift toward AI initiatives. Incumbents face a two-part threat: new AI vendors building action layers on top of existing systems of record, plus accelerated software development enabling competitors to rapidly expand into adjacent product categories.
• •Outcome-based pricing as the decisive shift: Customer support software is the first sector where verifiable task completion enables outcome-based pricing, replacing seat-based subscriptions. When enterprises standardize on paying per result rather than per user, incumbents face a structural disadvantage because repricing existing contracts requires dismantling revenue models built over decades, while new entrants design around outcomes from day one.