Two co-founders start a company. One writes the code. Six months in, they have a falling out. The coding co-founder walks. Here’s the problem nobody prepares for: without a proper vesting agreement, that departing co-founder may still own a large chunk of equity they didn’t earn by staying. But there’s a second problem that gets far less attention. If they were the one building the core product, their departure can leave the company without a clear right to keep developing what they started.
Vesting isn’t just about who owns what percentage of the company. It’s about who has the right to keep building the technology the company depends on.
What Vesting Actually Protects
Most founders think of vesting as an equity fairness mechanism. Stay four years, earn your shares. Leave early, forfeit the unvested portion. That’s true, but it’s only half the picture. The other half is IP continuity. When a co-founder builds software, writes code, or develops a technical process for the company, that work needs to be assigned to the company, not just theoretically owned because they were a “founder.” 17 USCS § 201, 35 USCS § 261.
Founders often skip this step because it feels unnecessary between people who trust each other. Then someone leaves. And if the assignment paperwork was never done properly, the company can be left arguing about who actually has the right to keep developing that codebase.
A Scenario Worth Thinking Through
Imagine two founders start a software company. One handles sales and operations. The other builds the product, including a proprietary internal tool that becomes the backbone of the company’s offering. Eighteen months in, the technical co-founder leaves after a disagreement about company direction. There’s a standard founder agreement with a vesting schedule, but no explicit IP assignment clause tied to the work product itself. Now the remaining founder wants to keep improving the tool, hire an engineer to build on it, and eventually raise funding.
An investor’s diligence team asks a simple question: who owns the IP in the core product? If the answer isn’t documented clearly, that’s a red flag that can stall or kill a raise, not because the company did anything wrong, but because nobody can prove it did anything right on paper.
Why This Matters More at the Starter Stage
Early-stage companies are exactly where this gets skipped. You’re moving fast, trust is high, and legal paperwork feels like something you’ll get around to later. But the earlier the technical work happens, the more foundational it usually is. The core algorithm, the first version of the platform, the internal system that becomes the product. If that work isn’t properly assigned to the company, and vesting isn’t structured to account for the specific IP being built, you’re exposed exactly when you can least afford it: at a fundraise, an acquisition conversation, or a co-founder exit.
What a Proper Setup Looks Like
A vesting agreement that actually protects the company’s ability to keep building includes a few basics:
- A standard vesting schedule (commonly four years with a one-year cliff)
- An explicit intellectual property assignment clause covering any code, inventions, or technical work created for the company 17 USCS § 201, 35 USCS § 261
- Clear language on what happens to IP rights if a founder leaves before their equity fully vests
- Documentation that ties the assignment to the actual work product, not just a general “founder agreement” template
None of this needs to be complicated. It needs to exist, and it needs to be specific to what’s actually being built.
The Takeaway
Vesting protects equity. Proper IP assignment protects your ability to keep building the thing that makes your company valuable in the first place. Skip one and you might survive. Skip both and a co-founder’s early exit can leave you without clear rights to your own product. If you’re not sure whether your founder agreements cover this, it’s worth a second look before it becomes a problem during a fundraise or an exit conversation. Let’s talk through what your current agreements actually protect, and where the gaps might be. Schedule a legal strategy review and we’ll map it out together.
If you want contracts that hold, IP that’s protected, and legal bills that don’t surprise you every month, let’s talk. Garcia-Zamor Law Firm delivers fractional in-house counsel with a unique advantage: business law PLUS IP expertise, brought to you by Ruy Garcia-Zamor, Elliott Alderman, Claudia Castillo, and Amulya Annasamudram. Passionately devoted to your success. Visit garcia-zamor.com or call (410) 531-9853.
