What Is a Mandatory Offer?
A mandatory offer (also called a mandatory bid) is a regulatory requirement in many jurisdictions that compels an acquirer — upon crossing a specified ownership threshold in a publicly listed company — to extend a formal offer to purchase all remaining outstanding shares. The mandatory offer must be at a minimum price (typically the highest price paid by the acquirer during a lookback period) and must include a cash alternative.
The mandatory offer rule exists to protect minority shareholders. When an acquirer accumulates a controlling stake, the remaining shareholders face diminished liquidity, reduced influence, and the risk that the controlling shareholder will extract private benefits. The mandatory offer gives minorities the right to exit at a fair price.
How Mandatory Offers Work
The Trigger
The mandatory offer obligation is triggered when a person (or persons acting in concert) acquires voting rights in a listed company that cross the specified threshold:
| Jurisdiction | Trigger Threshold | Lookback Price Period |
|---|---|---|
| UK | 30% | 12 months |
| Hong Kong | 30% | 6 months |
| Singapore | 30% | 6 months |
| India | 25% | 26/60 trading day VWAP |
| Australia | 20% (takeover threshold, not mandatory bid) | N/A |
| EU (most members) | 30-33% | Varies by member state |
| Japan | No general mandatory offer rule | N/A |
The Offer Terms
The mandatory offer must:
- Be extended to all remaining shareholders of the same class
- Offer a cash consideration (or cash alternative)
- Be priced at no less than the highest price paid by the acquirer during the lookback period
- Remain open for the minimum offer period prescribed by regulation
- Be unconditional (or conditioned only on reaching the acceptance threshold)
The Acceptance Threshold
In most jurisdictions, the mandatory offer must be conditioned on the acquirer receiving acceptances that bring its holding to a level sufficient for compulsory acquisition — typically 90%. If the threshold is not met, the acquirer retains its existing stake but cannot squeeze out the remaining shareholders.
Mandatory Offer vs. Voluntary Offer
| Feature | Mandatory Offer | Voluntary Offer |
|---|---|---|
| Trigger | Crossing ownership threshold | Acquirer’s choice |
| Price | Minimum price rules apply | No minimum (but must be fair and reasonable) |
| Cash option | Required | Not always required |
| Conditions | Limited (minimum acceptance only) | Can include financing, regulatory, MAC |
| Timing | Immediate upon triggering event | At acquirer’s discretion |
Strategic Implications
For Acquirers
The mandatory offer threshold creates a critical decision point:
- Stay below the threshold — accumulate up to 29.9% (in 30% jurisdictions) and influence the company without triggering a full bid
- Cross the threshold deliberately — plan a full takeover and budget for 100% acquisition from the outset
- Inadvertent triggering — concert party rules can aggregate holdings, unexpectedly crossing the threshold
Concert Party Risk
Acquirers must be aware that acting “in concert” with other parties can aggregate their holdings for threshold purposes. Concert party rules deem multiple parties to be a single acquirer if they cooperate to acquire or exercise control of the target. Informal arrangements, shared advisors, or coordinated trading can create concert party relationships.
Creeping Acquisitions
Some jurisdictions have “creeping” provisions that restrict acquisitions above the mandatory offer threshold without triggering a new full offer. For example, a shareholder holding 35% may be limited to acquiring no more than 1% per year without making a new mandatory offer.
APAC Context
Hong Kong — the SFC Takeovers Code imposes a mandatory offer at the 30% threshold. The minimum price is the highest price paid in the six months before the offer. The Code also restricts creeping acquisitions: a person holding 30-50% cannot acquire more than 2% in any 12-month period without triggering a new mandatory offer.
India — SEBI’s Substantial Acquisition of Shares and Takeovers Regulations require a mandatory open offer when an acquirer crosses 25% or acquires more than 5% in a financial year (for holders already above 25%). The mandatory offer must be for at least 26% of the target’s shares at a price determined by a formula based on volume-weighted average prices.
Singapore — the Singapore Code on Take-overs and Mergers triggers a mandatory offer at 30%, following the UK model. The Securities Industry Council administers the Code and reviews all mandatory offer compliance.
Australia — Australia does not have a mandatory offer rule per se. Instead, the Corporations Act prohibits any acquisition that takes a holding above 20% except through prescribed mechanisms (takeover bid, scheme of arrangement, or specific exemptions). This 20% “takeover threshold” effectively serves a similar protective function.
Japan — Japan does not impose a mandatory offer obligation, making it an outlier among major markets. Acquirers can accumulate large stakes without being required to bid for the remainder, though Financial Instruments and Exchange Act disclosure requirements apply at the 5% threshold.
“Mandatory offer rules are the single most important structural feature of APAC takeover regulation,” notes Daniel Bae, founder of Amafi. “They fundamentally shape acquisition strategy — every stake-building plan must map the mandatory offer triggers across all relevant jurisdictions from day one.”
Planning acquisitions across Asia Pacific? Amafi helps investors and advisors navigate takeover regulations and deal structures. Learn more.