Employee Stock Purchase Plan (ESPP)
An employee stock purchase plan lets eligible employees purchase employer shares, usually through payroll deductions and often at a discount.
How an ESPP usually works
A typical plan has:
- an enrollment date
- payroll deductions
- an offering period
- one or more purchase dates
- a purchase-price formula
The company accumulates payroll deductions, then uses them to buy shares for the employee on the purchase date.
Discount example
Assume:
- market price on purchase date: $40
- ESPP purchase price: 85% of market value
Employee purchase price:
$34
Immediate gross discount:
$6 per share
That 15% discount can create value before considering taxes, price movement or plan restrictions.
Lookback provisions
Some plans use the lower of:
- market price at the beginning of the offering period
- market price at the purchase date
and then apply a discount.
Tyra Biosciences disclosed a 2026 ESPP structure allowing purchases at 85% of the lower of the relevant beginning or purchase-date market value.[2]
A lookback can materially increase the economic value of participation.
Real 2026 example
EyePoint disclosed an ESPP allowing qualified participants to buy shares at 85% of the lesser of specified prices at the beginning or end of an offering period, subject to plan limits.[1]
The company also disclosed shares issued under the plan during 2026.
That shows why ESPPs affect both employee compensation and company share count.
ESPP vs. RSU
An RSU is compensation granted by the company.
An ESPP usually involves an employee choosing to use payroll deductions to purchase shares.
Both can create stock-based compensation accounting and dilution.
The employee economics are different.
ESPP vs. stock option
A stock option gives the right to buy shares at a strike price.
An ESPP typically purchases shares automatically under a periodic plan formula.
There is no separate long-term option exercise decision in the ordinary ESPP structure.
Dilution
When the company issues new shares for ESPP purchases:
shares outstanding can increase.
The effect may be modest relative to the total share count.
It should still be included in a complete dilution analysis.
Concentration risk
An employee can already depend on the same employer for:
- salary
- bonus
- benefits
Buying substantial employer stock adds another exposure to the same business.
A discounted purchase can be economically attractive while still increasing concentration risk.
Tax treatment
ESPP tax treatment depends on plan qualification, holding period and sale timing.
The accounting discount is not the same thing as after-tax investment profit.
Tax consequences can differ between qualifying and disqualifying dispositions.
Common mistakes
"An ESPP discount guarantees profit."
No. The share price can fall after purchase.
"An ESPP is the same as an RSU."
No.
"Payroll deductions eliminate investment risk."
No.
"ESPP shares cannot dilute shareholders."
Newly issued shares can.
Example
A 15% discount on a $40 market price produces a $34 purchase price before taxes and later market movement.
Professional note
Evaluate the purchase discount, lookback feature, holding requirements, annual limits and employer-stock concentration together. For company analysis, track ESPP issuance as one component of gross equity compensation rather than looking only at net share-count change.
Related terms
- Stock-Based Compensation
Stock-based compensation is compensation paid through equity-linked awards such as restricted stock, RSUs, performance awards and options. The expense can be noncash when recognized but can still create shareholder dilution.
- Common Stock
Common stock represents an ownership interest in a corporation and generally carries a residual claim after creditors and senior securities.
- Share Dilution
Share dilution occurs when new shares or share equivalents increase the ownership denominator and reduce an existing shareholder’s percentage claim unless the holder participates proportionally.
- Restricted Stock Unit (RSU)
A restricted stock unit is a promise or contractual right to receive company shares or equivalent value after specified vesting conditions are satisfied.
- Stock Option
A stock option gives the holder the right to buy a specified number of shares at a fixed exercise price before expiration, subject to award terms.
Related ROIStreet guides
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- Stocks vs. Bonds: A Practical Comparison
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- What Is a 401(k) Recordkeeper?
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- What Compensation Counts for a 401(k)?
There is no single universal 401(k) compensation number. A plan can use different definitions for deferrals, matching, profit sharing and testing, while statutory definitions govern limits such as Sections 401(a)(17), 414(s) and 415.
Sources
- U.S. Securities and Exchange Commission — EDGAR — EyePoint Pharmaceuticals — 2026 Form 10-Q, Employee Stock Purchase Plan
- U.S. Securities and Exchange Commission — EDGAR — Tyra Biosciences — 2026 Form 10-Q, Employee Stock Purchase Plan
- U.S. Securities and Exchange Commission — Beginners’ Guide to Financial Statements