Stock warrants can help startups raise capital and attract investors, but they also come with certain drawbacks. For founders, understanding how warrants work is essential before incorporating them into a fundraising plan. 

What is a stock warrant?

A stock warrant, sometimes called an equity warrant, is a security issued by a company that grants the holder the right to purchase shares at a specific price during a specific time frame, typically five to 10 years. When exercised, warrants create new shares—which means they dilute existing ownership. There are two broad types:

• Call warrants allow holders to buy shares at a future price 
• Put warrants let holders sell shares at a specific future price

In startup financing, call warrants are more common. Warrants impact your cap table and can affect valuation and reporting obligations. If offered to U.S. investors, they’re subject to SEC regulations and must be disclosed in financial statements. While warrants aren’t taxed at issuance, they become taxable when exercised, and sales of shares post-exercise may trigger capital gains tax.

How stock warrants compare to other instruments

Stock warrants can look similar to other instruments like stock options and SAFEs, but differ in important ways.

• Stock options. Unlike stock options, stock warrants can only be acquired via direct issue from a company. Options can be traded on the secondary market. Warrants also tend to have longer expiration dates.
• SAFEs. Warrant holders have to actively exercise warrants. SAFEs convert automatically after a triggering event.
• Convertible notes. Convertible notes are debt that typically converts into equity. Unlike warrants they are a direct investment and can accrue interest.
• Equity. Issuing equity dilutes ownership immediately. Stock warrants defer potential dilution—and if holders allow them to expire, don’t dilute ownership at all. 
• Debt. Debt financing often has a higher cost for founders. However, it does not entail any dilution of ownership.

Why investors want warrants—and why founders agree to them

Stock warrants are long-term tools, usually allowing holders the right to purchase stock (call warrant) at a price higher than the warrant’s strike or exercise price. While warrants tend to dilute ownership when exercised, they can be a way for founders to expand their runway without immediately diluting ownership.

Warrants are typically offered to investors along with other securities as part of negotiations. For holders, warrants offer equity if the company succeeds and potential larger returns compared to interest payments. 

“A well-designed warrant strategy supports hiring, innovation and expansion by aligning incentives with business goals,” said Thomas Taaffe, Head of Cap Table Onboarding at J.P. Morgan Workplace Solutions. “Warrants can be used as part of compensation packages and strategic partners or investors may receive warrants in exchange for funding or collaboration that accelerates product development. They can also incentivize local partners.”

Common misunderstandings about stock warrants

“Founders often underestimate how much warrants can dilute their ownership when exercised, especially if issued alongside financing,” said Taaffe, who also notes that founders may overlook complex terms like anti-dilution clauses and cashless exercises, which can affect the cap table.

This underestimation often happens when founders focus only on the immediate impact of new equity or warrant issuance—without modeling how multiple financing rounds, low exercise prices and cumulative instruments can reduce ownership over time. 

“Some founders may not fully model future scenarios, such as down rounds or the compounding effect of various equity-linked instruments,” said Taaffe. “Clear cap table modeling and scenario analysis are essential to avoid these surprises.”