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Carta Blog

Owner's Manual

Whether you’re getting your first option grant or managing a fund, our blog is the best place to learn about ownership, equity, and the Carta product.

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Founder education

What is IRS Form 3921?

If employees exercised incentive stock options (ISOs) last tax year, your company needs to file IRS Form 3921. Companies must file one form per employee, and if they miss the deadline or ignore IRS reminders and fail to file, they could end up paying expensive fines.

For founders

Running a company is hard. Here, find downloadable resources and articles we’ve created to make your job a little easier.

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For investors

Whether you’re a small venture firm raising your first fund or a veteran of the venture capital space, Carta has interviews, articles, videos, research, and more to help you achieve your goals.

Investor resources >

Learn about equity

Equity is confusing. We’re here to help. Our Equity Resource Center will help you understand equity basics, how to navigate your equity offer, what to expect when exercising, and more.

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