What Is a Call Option in M&A?
A call option gives the holder the right — but not the obligation — to purchase an asset at a predetermined price (the strike or exercise price) within a specified time frame. In M&A, call options are used as strategic tools for staged acquisitions, joint venture exits, management equity plans, and deal protection mechanisms.
Unlike call options traded on public exchanges, M&A call options are typically embedded in shareholder agreements, joint venture contracts, or acquisition agreements as bespoke contractual provisions negotiated between the parties. They create future acquisition rights that allow buyers to control timing and reduce upfront capital deployment.
Common Uses in M&A
Staged Acquisitions
A buyer acquires a minority stake initially with a call option to purchase the remaining shares at a later date. This structure is common when:
- The buyer wants to evaluate the business before committing to full ownership
- Regulatory approvals require a phased approach
- The seller wants ongoing participation before a full exit
For example, a private equity firm might acquire 60% of a target and hold a call option over the remaining 40%, exercisable after three years at a price tied to an EBITDA multiple formula.
Joint Venture Exits
Call and put options are standard exit mechanisms in joint ventures. A typical structure gives each party a call option over the other’s shares, often paired with reciprocal put options, triggered by specific events:
| Trigger | Mechanism |
|---|---|
| Deadlock | Either party can exercise call/put |
| Change of control | Non-changing party gets call option |
| Performance milestones | Majority partner gets call over minority |
| Time-based | Options become exercisable after a set period |
Deal Protection
In negotiated acquisitions, the acquirer may receive a call option or lock-up agreement over the target’s key assets or a block of shares. These provisions deter competing bids by ensuring the original acquirer has preferential access to the target. However, if the call option is too generous, courts may scrutinise it under fiduciary duty principles as an impermissible barrier to a competitive process.
Top-Up Options
A top-up option is a specific type of call option used in two-step acquisitions. The target grants the acquirer the right to purchase newly issued shares at the tender offer price in an amount sufficient to reach the short-form merger threshold (typically 90% in Delaware).
Pricing Mechanisms
M&A call option pricing typically uses one of three approaches:
- Fixed price — set at execution, appropriate for short-duration options
- Formula-based — tied to a financial metric such as an EBITDA multiple or book value, with the specific multiple agreed upfront
- Fair market value — determined by an independent valuation at the time of exercise, often with a floor or cap
The pricing mechanism is frequently the most negotiated aspect of an M&A call option. Sellers prefer fair market value (capturing future upside), while buyers prefer fixed or formula-based pricing (providing certainty and capturing value they help create).
Key Contractual Terms
A well-drafted M&A call option addresses:
- Exercise period — when the option can be exercised (specific dates, rolling windows, or event-triggered)
- Exercise price — the purchase price or formula for determining it
- Transfer restrictions — limitations on the underlying shares during the option period
- Anti-dilution protections — adjustments if the target issues new equity
- Conditions precedent — regulatory approvals, antitrust clearance, or other requirements
- Tag-along / drag-along — interaction with existing tag-along and drag-along rights
APAC Context
Call options are widely used in APAC M&A, with jurisdiction-specific considerations:
Australia regulates call options over listed securities under the Corporations Act’s takeover provisions. A call option over more than 20% of a listed company’s shares may trigger the takeover threshold, requiring a formal takeover bid or reliance on a specific exemption. The Australian Securities and Investments Commission has issued guidance on when option arrangements constitute an association that aggregates holdings for threshold purposes.
India permits call options in private company shareholder agreements, but the Reserve Bank of India’s foreign exchange regulations impose restrictions on pricing — options involving foreign investors must be exercised at fair market value as determined by an internationally accepted methodology, effectively prohibiting fixed-price or formula-based options for cross-border transactions.
Japan uses call options (shinkabu yoyaku-ken) extensively in joint ventures and staged acquisitions. Japanese tax treatment of call option premiums and exercise can be complex, particularly in cross-border structures where transfer pricing rules apply to intercompany option grants.
“Call options are one of the most versatile structuring tools in APAC M&A,” notes Daniel Bae, founder of Amafi. “But the regulatory treatment varies dramatically — what works in Singapore may trigger takeover rules in Australia or pricing restrictions in India.”
Structuring staged acquisitions across Asia Pacific? Amafi helps companies and investors design flexible deal structures across the region. Learn more.