Merger Arbitrage
Also written Merger arbitrage strategy
An event-driven Category III strategy: go long the target company and long or short the acquirer, to capture the gap between the target's price and the deal price as a merger completes.
In plain language
When one company agrees to buy another, it almost always has to pay more than the target's share price before the deal was announced — otherwise the target's board would not approve. The workbook calls that pre-deal price the unaffected share price.
After the announcement, the target's shares usually jump towards the offer price but not all the way. The deal might fail; approvals take time. That remaining spread is what merger arbitrage tries to capture.
The fund buys the target and, depending on its view, shorts or buys the acquirer:
- Short the acquirer when the deal might not complete, or when the acquirer seems to be overpaying — its share price may fall.
- Buy the acquirer when the deal is effectively certain and the acquirer looks undervalued against the agreed conversion ratio.
It is an event-driven strategy: the trigger is a material corporate event, not a view on the market.
How it works
The two companies (section 10.1.4.2). The acquiring company buys shares of another company; the target company sells its shares or is merged into the acquirer.
Why short the acquirer — two reasons the workbook gives:
- Uncertainty in deal completion. Until final allotment of shares, board, regulatory and shareholder approvals are pending. If the deal is not approved or is delayed, there is a high risk it fails.
- The premium. If the premium paid to the target is over-valued, the acquirer's share price is at risk of falling; if under-valued, it is likely to rise.
The skill. Success depends on estimating the fair value of the premium, which decides the conversion ratio, and positioning in the acquirer accordingly.
Where it sits. Event-driven strategies take positions in one company pursuant to debt restructuring, mergers, acquisitions, spin-offs or management change, and may be long or short in equities or fixed income. The other event-driven types in Chapter 10 are the activist strategy and the pre-IPO strategy.
Like any strategy, merger arbitrage is exposed to changing macro-economic factors, unpredictable company events, market factors and economic cycles.
The formula
In a full-stock deal where 10 acquirer shares are exchanged for 139 target shares:
Fair price of acquirer = (139 × Target price) ÷ 10
If market price of acquirer < fair price → acquirer undervalued, go long
If market price of acquirer > fair price → acquirer overvalued, go short
A worked example
The workbook's Fund MAS (Example 10.7). Company ID announces a full-stock acquisition of Company CF with a conversion ratio of 139:10. Both boards have approved; the workbook treats the risk of deal failure as minimal.
Prices a minute before the announcement: ID Rs 540.00, CF Rs 39.25.
Is ID cheap?
Fair price of ID = (139 × Rs 39.25) ÷ 10 = Rs 5,455.75 ÷ 10 = Rs 545.58
Market price = Rs 540.00 → ID is undervalued, so buy it
With deal risk minimal and the acquirer undervalued, the fund goes long both:
| Position | Shares | Cost | Close price | Close value |
|---|---|---|---|---|
| ID | 1,00,000 | Rs 5,40,00,000 | Rs 567.80 | Rs 5,67,80,000 |
| CF | 10,00,000 | Rs 3,92,50,000 | Rs 41.10 | Rs 4,10,00,000 |
| Total | Rs 9,32,50,000 | Rs 9,77,80,000 |
Gain = Rs 45,30,000
Return = 9,77,80,000 ÷ 9,32,50,000 − 1 = 4.86% in one day
The arithmetic checks. Note the answer to "why not short ID?" — the deal was approved, and the ratio said ID was cheap. The short leg is for when completion is in doubt or the acquirer is overpaying.
Why NISM asks about it
Chapter 10, section 10.1.4.2 (Merger Arbitrage Strategy), inside 10.1.4 on event-driven strategies, defines the strategy, gives the two reasons for shorting the acquirer and works Example 10.7. Chapter 10 is the highest-weighted chapter at 12%. Expect "which position is taken in the target" (always long), "when would the fund short the acquirer", and a fair-price calculation from a conversion ratio.
Common exam traps
- The target is always bought. The acquirer may be shorted or bought — the workbook's own example buys both.
- Shorting the acquirer answers two risks: deal failure and overpayment. Not "the acquirer always falls".
- The unaffected share price is the price before the deal, and the premium is paid over it.
- Merger arbitrage is event-driven, not market-neutral by definition.
- Workbook wording slip: Example 10.7 says "shareholders of Company ID will be issued 139 shares of Company CF for every 10 shares". The fair-price calculation, (139 × CF price) ÷ 10 = ID price, only works the other way round — 10 ID shares for every 139 CF shares. Trust the calculation.
- Another inconsistency: the example first says both boards have approved, then in the analysis says it has been approved "by both the Boards and regulators". Either way, the workbook treats deal risk as minimal.
Check yourself
1.Why does a Category III AIF following a merger arbitrage strategy take a long position in the target company's shares?
- a)Because the acquirer usually has to pay a premium over the target's unaffected share price, and the fund aims to capture the spread between the current price and the acquisition price on completion
- b)Because SEBI requires merger-arbitrage funds to hold the target's shares until the deal closes
- c)Because the target company always issues bonus shares after a merger
- d)Because the target's share price usually falls after the announcement, so the fund buys cheaply
Show the answer
Answer: (a) Because the acquirer usually has to pay a premium over the target's unaffected share price, and the fund aims to capture the spread between the current price and the acquisition price on completion
The workbook says: "When an Acquiring Company provides its best offer in the merger or acquisition deal to the Target Company, it typically needs to pay a premium over the Target Company's unaffected equity share price, or the current share price before the deal." The premium is needed "because such Target Company's board of directors is only likely to approve the acquisition of the company, if the Acquisition Price is significantly higher than the current equity share price."
So: "a long position is taken in the equity shares of the Target Company, to capitalize on the spread between the Target Company's current share price and the Acquisition Price, on completion of the deal."
The fund goes long the target and "simultaneously take[s] a short or long position in the equity shares issued by the Acquiring Company."
Why the others are wrong:
- Option 2 — the workbook states no such SEBI requirement.
- Option 3 — bonus shares have nothing to do with the rationale.
- Option 4 — the premium is what drives the trade. The target is bought to capture the spread up to the acquisition price.
2.A Category III AIF pursuing a convertible arbitrage strategy will typically:
- a)Go long the company's equity shares and short its convertible bonds
- b)Go long the company's convertible securities and simultaneously short the same company's equity shares
- c)Go long the target company and short the acquiring company
- d)Buy pre-IPO shares at a discount
Show the answer
Answer: (b) Go long the company's convertible securities and simultaneously short the same company's equity shares
The fund will take a long position in convertible securities issued by a company and simultaneously take a short position in the same company's equity shares. If the share price falls, the short gains and the fund keeps earning coupons; if it rises, the fund converts and sells the shares, compensating for the loss on the short.
Option A reverses the positions. Option C is merger arbitrage. Option D is the pre-IPO strategy.
Where this is taught
Free preparation for NISM Series XIX-CRelated terms
- Activist StrategyAn event-driven Category III AIF strategy that takes a significant stake in a company facing a material corporate event, aiming to improve its operations by participating in management.
- Short positionAn outstanding, unsettled sell position in a derivatives contract — the seller of a futures contract, or the seller (writer) of an option, is said to be short.
- Hedge FundA pooled vehicle using diverse or complex trading strategies, long and short positions and fund-level leverage — in India, the AIF Regulations place hedge funds in Category III.
- Event-driven StrategyA Category III AIF strategy taking long or short positions in one target company around a significant corporate event — a merger, acquisition, spin-off, restructuring or management change.
- Convertible ArbitrageA Category III long-short strategy: buy a company's convertible bond or preference share and short its equity, to profit when the conversion terms and the share price fall out of line.
- Unaffected share priceA target company's share price before a merger or acquisition is announced — the base over which an acquirer must pay a premium, and the price a merger arbitrageur measures the spread from.
- Conversion RatioThe number of equity shares received for each convertible security, or the share-exchange rate fixed in a merger. It is fairly priced when the shares receivable are worth exactly what is given up.