Exercise Price (Strike Price): The Number That Decides If Your Options Are Worth Anything
How the fixed price set at grant determines whether ESOP shares or SGX options end up in profit.
The exercise price, also called the strike price, is the fixed price at which the holder of a stock option or share option can buy (or, for a put, sell) the underlying shares, regardless of where the shares are actually trading when the option is exercised.
Not financial advice. All figures for educational reference only. Data as at September 2026.
Last updated: September 2026
Key Takeaways
- The exercise price is fixed at the time the option is granted or the contract is written, and it does not change even if the market price of the underlying shares moves substantially afterward.
- For an Employee Stock Option Plan (ESOP) in Singapore, the taxable gain on exercise is generally the difference between the shares’ open market value and the exercise price at the point of exercise.
- An option is ‘in the money’ when the market price is above the exercise price for a call (or below it for a put), and ‘out of the money’ when the opposite is true.
- On SGX, structured warrants and options reference an exercise price set by the issuer or exchange, distinct from the exercise price used in private company ESOP grants.
- A low exercise price relative to a company’s expected future value is one of the main reasons early startup employees can see outsized gains if the company grows and eventually lists or is acquired.
What Is an Exercise Price?
Every option contract, whether it is an employee stock option granted by a private Singapore startup or a listed structured warrant traded on SGX, specifies an exercise price at the outset. This is the price the option holder pays to acquire the underlying share (for a call option) if they choose to exercise their right. It is set once, at grant or issuance, and stays fixed for the life of the option regardless of how the underlying share price subsequently moves.
The value of holding an option therefore depends entirely on the relationship between the exercise price and the current market price. If the market price rises well above the exercise price, exercising becomes attractive because the holder can buy shares below their current market value. If the market price stays below the exercise price, the option is worth exercising only if there is reason to expect future appreciation, or it may simply be allowed to lapse unexercised.
How Exercise Price Works for Singapore ESOPs
Singapore startups commonly set the exercise price of newly granted ESOP options at, or close to, the fair market value of the shares on the grant date, often based on the price paid by investors in the company’s most recent funding round. As the company grows and its valuation rises in later funding rounds, the gap between that original exercise price and the shares’ current fair value widens — this gap is the option’s intrinsic value.
Under Singapore tax rules, gains from exercising ESOP or Employee Share Ownership (ESOW) plan options are taxed as employment income, generally based on the difference between the shares’ open market value and the exercise price at the time of exercise (for ESOP) or vesting (for ESOW), not at the time of eventual sale. Qualifying startups and their employees may in some cases apply for tax deferral or partial exemption schemes such as the Equity Remuneration Incentive Scheme, which affect when and how much tax is payable, though the underlying exercise price mechanics stay the same.
Exercise Price Example
A Singapore fintech startup grants an employee options to buy 10,000 shares at an exercise price of S$1.00 each, based on the company’s valuation at the time of grant. Three years later, after a new funding round, the company’s shares are valued at S$4.00 each. If the employee exercises the full grant, they pay S$10,000 (10,000 shares × S$1.00) to acquire shares now worth S$40,000 — a S$30,000 gain, which is generally taxable as employment income at exercise, before any eventual sale of the shares is considered separately for capital gains purposes (Singapore does not currently levy a general capital gains tax).
Advantages of a Well-Set Exercise Price
- Upside participation without upfront ownership cost. Employees can wait to commit capital until they are confident the exercise makes financial sense.
- Alignment with company growth. A lower exercise price set early in a company’s life means employees benefit disproportionately if the company’s value later increases.
- Defined downside. An option holder never has to pay more than the exercise price to acquire the shares, and can simply choose not to exercise if the shares are worth less.
- Flexibility on timing. Within the option’s exercise window, the holder can choose when to exercise, which can help with tax and cash flow planning.
Risks and Limitations
- Exercise cost is due upfront. The employee must pay the exercise price in cash (unless a cashless exercise arrangement is offered), even before knowing whether the shares can later be sold.
- Illiquid private company shares. For unlisted Singapore startups, there may be no ready market to sell shares after exercising, tying up cash in an illiquid asset.
- Tax due before a liquidity event. Employment income tax on the exercise gain can be payable before the employee has actually sold any shares to generate cash.
- Underwater options. If the company’s valuation falls below the exercise price, the option has no intrinsic value and exercising would mean paying more than the shares are currently worth.
- Expiry risk. Options typically must be exercised within a set window after vesting or after leaving the company, or they lapse worthless.
Exercise Price vs Market Price vs Grant Price
| Term | What It Means | When It’s Set | Changes Over Time? |
|---|---|---|---|
| Exercise (strike) price | Fixed price to buy the underlying share via the option | At option grant or contract issuance | No, stays fixed |
| Market price | The current trading or fair value of the underlying share | Continuously, as the company or market moves | Yes, fluctuates |
| Grant price | Often used interchangeably with exercise price for ESOP grants | At the time of grant, usually tied to a valuation event | No, stays fixed |
| Intrinsic value | Market price minus exercise price (if positive) | Recalculated whenever market price changes | Yes, fluctuates |
Source: general options and ESOP mechanics; specific plan rules vary by company.
The Bottom Line
The exercise price is the anchor point that determines whether a stock option is worth exercising at all. For Singapore ESOP holders, understanding where the exercise price sits relative to current and expected future share value is central to deciding when — and whether — to exercise, and to anticipating the resulting employment income tax bill.