Startup Employee Stock Options 101 (Part 1)

The following post explains the basics of Startup Stock Options from Carta’s presentation: “Understand Your Options: Equity 101 for Startup Employees”. The remaining sections are covered in the rest of this 3-part blog post. You can follow us on Twitter @cartainc for updates on upcoming events.

Startup Stock Options 101

If you work for a startup, stock option grants are your way of sharing in the company’s success. But very few startup employees understand what stock options really are and how they work. By the end of this post, you’ll understand stock options better than most of your coworkers, and in some cases, your employers.

Part 1: Stock Option for Startups 101

We’ll be using Kerri as our example. She just joined a new startup called Meetly, and she was promised equity stock options in her offer letter. This is a picture of Meetly’s offer letter:

Stock Options Offer Letter

Like most offer letters, it only tells Kerri the number of stock options she was granted. As you can see, Meetly has promised Kerri 100 shares of stock option grants. The letter does not tell her what to do with those option grants, what kind of option grants she has, or how much they are worth. There’s really no transparency when it comes to employee stock options, and unfortunately, this is how most companies do it today.

There are four things that Kerri should consider when she receives this letter. These four things are what every startup employee should make sure they know about stock options when joining a company:

  1. Types of Stock Options for Startups
  2. Stock Option Agreement
  3. Vesting
  4. Termination

Types of stock options for startups

A stock option is the right to buy a set number of shares at a fixed price. In Kerri’s case, that fixed price is $1. The hope is that the value of the stock goes up, but the price stays the same, which means you make money on the difference.

There are 2 types of employee stock options: ISOs and NSOs. ISOs is short for incentive stock options, and NSOs is short of non-qualified stock options. If you’re an employee like Kerri, you probably have ISOs. If you’re a consultant, you’ll have NSOs. The main difference here is that ISOs have tax benefits.

Stock option agreement 

Now for Kerri’s stock option agreement. The big distinction to make here is that an offer letter is NOT legally binding. We see a lot of companies come to Carta to issue stock option grants to their employees, and sometimes those options were promised to the employees months ago. Until you’ve received and signed an option agreement, you technically don’t own stock options.

img 7

This is what Meetly’s Option Agreement looks like. Yours probably looks very similar. If you didn’t receive one, you can ask your company and they should be able to provide it. If you just joined in the last month or two, it is possible that the board has not approved your options yet, in which case you should receive this shortly after the next board meeting.

It’s also worth mentioning that if your company is on Carta, you won’t receive a paper version of the stock option agreement. Don’t panic! Instead, you checked a box agreeing to the terms when you accepted online. You can log into your portfolio to view and print the actual agreement.


Vesting means that you have to earn your employee stock options over time. Companies do this because they want employees that will stay with them and contribute to the company’s success over many years. If they didn’t have vesting, an employee could accept an offer, work at the company for a month, buy a bunch of the company’s stock, and then quit. Vesting prevents that.

Kerri’s vesting schedule is outlined in her offer letter and her option agreement. She has what’s called traditional vesting. There all kinds of vesting schedules, but this is by far the most common.

Stock Option Vesting Schedule

There are two parts to a traditional vesting schedule. The first part is called a “cliff.” A cliff is really just the first chunk of shares that vest, and you gain the right to buy. Kerri has a one year cliff, which is standard. After one year of working at Meetly, she can buy ¼ of her options, or 25 shares.


The second part is the total length of the schedule. This outlines how often, and for how long, Kerri’s shares will vest. After Kerri reaches her cliff, her remaining shares will continue to vest for 36 months, or 2 shares each month.


If she leaves the company, her shares will stop vesting immediately and she will only have the right to buy the shares that have vested as of that date.


What happens if Kerri leaves the company? This is known as a termination.

The two most common scenarios are if Kerri quits or she is fired by the company. Startups generally have a higher turnover rate than larger companies, so terminations are fairly common.


Remember that if Kerri leaves, she only has the right to buy her vested options; she only maintains this right for a set window of time. In the cases of both voluntary and involuntary termination (quitting or getting fired), that window is typically 30 days to 90 days.

The other two scenarios we see outlined in option plans are death and disability. If Kerri dies or leaves the company due to a disability, the window is generally extended to 6 months or 1 year.

It’s really important to not forget about these windows because your company is not obligated to remind you when you leave — they usually only tell you in your option agreement when you first join.

Below is a quick recap of what we’ve covered:

  1. We described the two kinds of employee stock options — ISOs and NSOs. Again, ISOs are issued to employees and have tax benefits.
  2. We detailed Stock Option Agreements: the one document you want to make sure you receive and sign.
  3. We covered vesting schedules and how companies incentivize employees to stay longer.
  4. Finally, we provided information about termination and remembering to exercise in the 30-to-90-day window after leaving a company.

These are the four things that every startup employee should think about when they receive their offer letter and join a new company. We cover Stock Option Economics and how to think about what your options are actually worth in Part 2.

Read Equity 101: Part 2

Read Equity 101: Part 3


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