Guide · Corporate actions and event risk · Updated 2026-09-23

A merger spread prices a completion date as well as a probability, and on an Indian scheme the date belongs to a tribunal with no binding deadline

A deal is announced, the target jumps, and it settles a few per cent below the value on offer. That gap is usually read as a discount the market has left on the table, or as a return waiting to be collected. It is neither. It is a price, and what it prices is a joint statement about how likely the deal is to complete, what the target is worth if it does not, and when completion arrives.

The third term is the one most readers skip, and on Indian schemes it moves the most.

A spread is a probability and a date, and neither can be read without the other

Holding the target through a pending deal leaves two outcomes. If the deal completes, the holder receives the offer, here 1,000. If it fails, the target trades back to a fallback price, here assumed to be 800. Today's price of 940 must sit between them, and where it sits is the market's weighting of the two. Ignoring time, the weight is the price minus the fallback divided by the offer minus the fallback: 140 over 200, or 70.0 per cent.

That reading assumes the offer is paid today. In a cash deal, 1,000 paid in six months is worth about 970.9 now at an opportunity cost of 6 per cent a year, and 943.4 if it arrives in twelve. The top of the range falls toward the price, the same distance travelled becomes a larger share of a shorter range, and the implied probability rises: to 84.7 per cent at six months once 4.70 of dealing costs are added, and to 100.9 per cent at twelve.

A figure above 100 per cent is not a rounding problem. It says that at that date even certain completion does not pay for the wait, so the price makes sense only if the market expects the deal sooner, expects a better offer, or is simply wrong. The spread alone cannot say which.

Read down a column and the probability climbs with the date; read across and it falls as the fallback rises. Neither input is on the screen, and a reasonable change in either moves the answer by more than most news in the life of a deal does.

Cash or shares decides what the spread is paying for

A cash offer promises a fixed number of rupees. A share swap promises a fixed number of acquirer shares, so its rupee value moves with the acquirer every day until completion. The arbitrage position differs accordingly. In a cash deal it is the target, bought and held, with the whole price paid up front. In a swap it is the target bought and the acquirer sold in the swap ratio, half an acquirer share per target share in the illustration, which locks the ratio rather than a rupee amount.

The second difference decides everything that follows. Half an acquirer share delivered in a year is worth half a share today, because the share carries its own return while the deal is pending. So in a swap, time value is not part of the spread. When the short is a futures contract this is visible in the price: the futures price already contains the carry, and selling it hands the interest back to whoever holds the long leg, a point worked through in why a futures price above spot is a statement about funding. The illustrative swap in the table above therefore implies 75.3 per cent at six months and 78.0 per cent at twelve: the date barely moves it.

In India the two structures also travel by different legal routes. A share swap between listed companies is ordinarily a scheme of amalgamation under sections 230 to 232 of the Companies Act 2013, and an acquisition under a tribunal-sanctioned scheme in which the target is itself the transferor or transferee is exempt from the open offer obligation by regulation 10(1)(d)(ii) of the takeover regulations. A cash exit for public shareholders usually arrives instead as an open offer, which is partial and accepted proportionately (see how the open offer price and acceptance work), or as a delisting offer that succeeds only if the acquirer reaches 90 per cent (see the delisting price). In both, the rupees received are uncertain even when the deal completes, so an Indian cash spread blends a probability with an acceptance ratio.

Three claims on one spread, and which of them grows with time

Any spread can be split into what it must pay for the wait, what it must pay to hold the position, and what is left to pay for the chance of a break. Only the last is compensation for risk. Doing the split at two dates shows why the same headline spread describes two different deals.

In the cash deal, doubling the date doubles the time value and consumes the whole of what was paying for risk. In the swap, the same doubling adds only the opportunity cost of the margin posted against the short, and the compensation for break risk barely moves. A spread of 60 on a swap is a statement about risk. A spread of 60 on a cash offer is, at a year's horizon, a statement about interest.

The holding costs in the swap are small in rupees and large in capital. The long leg is paid in full and the short futures leg needs margin, here an illustrative 20 per cent of its notional, so the position ties up 1,140 to earn a spread of 60: 5.3 per cent on the capital rather than 6.4 per cent on the target price.

The approval sequence, and which of its clocks actually bind

The date the arithmetic depends on is not chosen by the parties. It emerges from a sequence of approvals, several of which cannot start until the one before has finished, and each carries a different kind of rule about time: a deadline that ends in deemed approval, an endeavour that ends in nothing, or no clock at all.

One. The board and the file. The boards approve the scheme with a valuation report from a registered valuer, a fairness opinion from a SEBI-registered merchant banker, and reports of the audit committee and a committee of independent directors, as the master circular on schemes of arrangement requires (SEBI/HO/CFD/POD-2/P/CIR/2023/93, 20 June 2023). The documents go to the exchanges under regulation 37 of the listing regulations within 15 working days of the board meeting.

Two. The exchanges and SEBI. The designated exchange forwards the draft to SEBI within three working days, and SEBI "shall endeavour" to comment within 30 days of the later of three events, the receipt of a satisfactory reply to its clarifications among them, so each round of questions restarts the count. The exchanges then issue an observation letter valid for six months, within which the scheme must be filed with the tribunal. An NSE letter of February 2026 records the exchange's reference to SEBI on 12 December 2025 and SEBI's comments on 13 February 2026, 63 days later. For schemes E and F below, the same step took 95 days.

Three. The competition regulator, where the deal is notifiable. The Competition (Amendment) Act 2023, whose merger provisions came into force on 10 September 2024, replaced the old 30 day filing deadline with a duty to notify before consummation, cut the outer limit in section 6(2A) from 210 to 150 days, and gave the Commission 30 days under section 29(1B) to form a prima facie opinion, failing which the combination is deemed approved under the proviso to section 31(1). The 30 days exclude the time parties take to answer questions. The same amendment made a deal worth more than 2,000 crore notifiable where the target has substantial business operations in India, even if the target is small.

Four. The sector regulator. A bank, a non-bank lender or an insurer adds its own regulator. The Reserve Bank's Commercial Banks (Voluntary Amalgamation) Directions, 2025, in force from 28 November 2025 and repealing the earlier instructions for private banks, require its no-objection before a scheme merging a non-bank into a bank goes to any court or tribunal, and route a merger of two banking companies through section 44A of the Banking Regulation Act, with approval by two-thirds in value of shareholders and sanction by the Reserve Bank itself. The directions set no period within which the Reserve Bank must decide.

Five. The first motion. The tribunal orders meetings of shareholders and creditors, or dispenses with a creditors' meeting where 90 per cent in value consent by affidavit under section 230(9). Notice of each meeting goes out at least one month ahead under rule 6 of the Companies (Compromises, Arrangements and Amalgamations) Rules 2016, and the authorities listed in section 230(5), from the central government and the income-tax department to SEBI, the exchanges and the competition regulator, each have 30 days to make representations.

Six. The vote. Section 230(6) needs a majority in number representing three-fourths in value of those voting. In the cases the master circular specifies, chiefly allotments to the promoter group or related parties, the scheme can be acted upon only if public shareholders' votes in favour exceed those against. Objections can be raised only by holders of at least 10 per cent of the shares or 5 per cent of outstanding debt, under section 230(4).

Seven. The sanction. The second motion ends in an order under section 232. The only clock is section 422: the tribunal is to make every endeavour to dispose of a petition within three months, and where it does not it records reasons and the period may be extended by up to 90 days. Nothing is deemed. Where the companies are registered in different states each goes to its own bench; the Corporate Laws (Amendment) Bill 2026, introduced on 23 March 2026 and reported on by a joint parliamentary committee on 3 August 2026, would send every scheme to the bench of the transferee company, but it had not been enacted at the date of this page. An aggrieved party can appeal within 45 days, extendable by 45 more, under section 421(3).

Eight. Effect and the new shares. Each scheme defines its own effective date, usually the day the certified order is filed with the registrar under section 232(5). The record date follows (under T+1 it is also the ex-date, as the record date guide explains), trading in the target stops, and the master circular requires the new shares to be listed and trading within 60 days of receipt of the order. The fast-track route of section 233, widened by amendment rules notified on 4 September 2025 and decided by the Regional Director with a 60 day deemed no-objection, is closed where the transferor is listed, so it never reaches the targets that merger arbitrage is about.

The consequence is lopsided. The one approval that now has a hard deadline, the competition regulator's, can take at most 150 days from notice and usually runs in parallel with everything else. The approvals on the critical path, SEBI's comments and the tribunal's two motions, carry only an endeavour, and the Reserve Bank carries no clock at all. Anything written before September 2024 quotes 210 days and a 30 day filing deadline. In the schemes timed below the competition review was never the long pole.

The contrast with a cash open offer is sharp. There SEBI must comment on the draft letter of offer within 15 working days or is deemed to have no comments, under regulation 16(4) of the takeover regulations; the tendering period is 10 working days; and payment is due within 10 working days of its close. A cash offer runs on a timetable. A scheme runs on a queue.

Six schemes, timed from their own filings

The dates below come from the companies' exchange filings, NSE observation letters, the tribunal orders and contemporaneous reports, for six share-swap schemes between listed companies announced in 2022 and 2023 and completed between 2022 and 2024. They are anonymised by letter and described only by sector.

The first finding is the range: 202 to 502 days from announcement to record date, with a median of 443. A deal priced for six months that takes fifteen is not an outlier on this evidence. It is the middle.

The second is where the days went. From announcement to the order convening meetings took 48 to 265 days; from that order to the final sanction, 88 to 211; from sanction to record date, 15 to 118. Where the competition regulator's decision is on the record, it was never the constraint. In A it approved on day 130 and the tribunal sanctioned on day 347; in D it cleared the deal under the green channel on day 106, the Reserve Bank's no-objection followed on day 177, and the sanction came on day 450.

The third is the cleanest comparison in the data. E and F were approved at the same board meeting of the same acquirer in September 2022. The exchange referred both to SEBI on the same day, 95 days later, and SEBI commented on both on the same day, 190 days after the announcement. Everything that differed afterwards was the tribunal's calendar: F's meetings were ordered 29 days after E's, its final sanction came 83 days later, and its record date 81 days later. Nothing about either deal's probability changed that. Only its date did.

B is the fast case and the reason is visible: its first-motion order came 48 days after the announcement. Even so, the acquirer's bench sanctioned on day 136, expressly subject to the order of the target's bench in another state, and the scheme took effect on day 192. A is the reminder that sanction is not completion: 118 days separated its sanction from its record date.

The same spread at four completion dates

Hold the spread fixed and vary only the date. A target at 940 against 1,000 is a gross 6.4 per cent if the deal completes. Over six months that is 12.8 per cent a year in simple terms; delayed three months, 8.5; six months, 6.4; twelve months, 4.3.

Those rates assume completion. Weight in the break, with a fallback of 800, and time takes its toll twice. If the chance of completion stays at 90 per cent however long the deal takes, the weighted rate falls from 8.5 per cent a year at six months to 2.8 at eighteen. If the risk of a break instead accrues evenly with time, so that a 90 per cent chance over six months becomes 81.0 per cent over twelve, the same rate falls from 8.5 to 0.4. A delay does not only stretch the denominator. It gives the deal longer to fail.

The six real schemes show the same effect in exchange prices. Each opening spread below is the gap between the value of the shares offered and the target's close on the first session after the announcement, divided by the years the scheme actually took to its record date.

The four schemes that opened above 6 per cent, C to F, opened at 6.2 to 9.6 per cent, which looked like 12.3 to 19.3 per cent a year on a six month view. Over the time the schemes actually took they were 5.4 to 9.0. For a position hedged with futures these are a premium over the carry the hedge earns, before costs, dividends and margin, not a total.

A deal that completes can still go against you on the way

A spread is not a fixed amount that decays toward zero. It is the difference between two prices and it moves every day. In five of the six schemes it later stood at one and a half times its opening level or more; in D it went from 9.6 to 20.1 per cent before the deal completed.

For a holder, that path is a loss on the way to a gain. A position long one target share and short the ratio of acquirer shares, entered at the first close, was at its worst 13.5 per cent below its entry value in D, 9.9 in E and 8.3 in F, in schemes that all completed. With futures as the short leg, every rise in the acquirer is paid out in cash the same day, while the matching rise in the target is only a price on a screen, and when the spread widens the cash paid out exceeds the value gained. A holder who cannot meet that cash can be closed out near the widest point, which turns a deal that completed into a realised loss.

The break price is not the price before the announcement

The fallback is the most consequential input and the least observable. The usual anchor is the target's close before the announcement, and it is wrong for three reasons. The market moves: a target that would have traded at 800 without the deal would have moved with the market for as long as the deal was pending, so after a 10 per cent fall the fallback is nearer 720 and after a 5 per cent rise nearer 840, which moves the implied probability at six months from 89.6 to 80.0 per cent. The failure is information: a deal dies of something, a regulator's objection, a condition that cannot be met, a dispute between the parties, and the market learns it at the moment of the break. And the holders have changed: late in a deal much of the float can be held by people who own it only for the deal, and a break turns all of them into sellers at once.

One measured case shows how far the anchor can be from the outcome. A media merger announced in September 2021 obtained the exchanges' letters, the competition regulator's approval with modifications, shareholder approval and the tribunal's sanction in August 2023, and was terminated by the acquirer in January 2024 after the long-stop date had passed. The shares on offer were in an unlisted company, so there was nothing on an exchange to sell against the target.

In its first session after the termination the target fell 32.6 per cent, to a price 39.0 per cent below its close before the announcement and 50.3 per cent below that close carried forward by the broad index, which had risen 22.8 per cent over the 28 months. It even closed 16.5 per cent below where it had traded a week before the announcement, before earlier corporate news lifted it 36.8 per cent in six sessions, which leaves open which pre-announcement price was ever the right anchor. One case proves nothing about averages. It shows the size the error can reach, and that it arrived after every approval had been granted. Approval removes regulatory risk. It does not remove the parties.

What a retail holder can actually build

The textbook position needs a short, and Indian rules allow one in narrower forms than most explanations admit. SEBI's circular of 5 January 2024 (SEBI/HO/MRD/MRD-PoD-3/P/CIR/2024/1) restates the 2007 framework: every class of investor may short sell, naked short selling is barred, delivery is mandatory at settlement, and a retail seller may disclose a short sale by the end of the trading day. A cash short that is neither covered the same day nor backed by borrowed shares fails at settlement and goes to the exchange's auction, as the short delivery guide explains.

Borrowed shares come from the securities lending scheme, open to retail investors through participating members, but only in eligible securities (essentially the derivatives list, qualifying index exchange traded funds and a few other heavily traded shares), for at most 12 months, and with loans foreclosed on the record date of a merger, amalgamation or open offer (NSE Clearing, lending scheme FAQ, July 2025). SEBI's chairman said on 19 August 2026 that both frameworks are under review; until new rules are issued, these stand.

In practice the short is a stock future, and three things follow. An acquirer outside the 210 stocks with futures can be shorted overnight only if it happens to be on the lending list, which is drawn mostly from those same stocks. The contract fixes the size: at the median contract value on 18 September 2026, 6.52 lakh, the smallest hedge is one acquirer contract against the target shares that convert into it. And a fifteen month deal means about fifteen monthly rolls, now on the last Tuesday of each month (NSE circular NSE/FAOP/68747), each crossing a bid and an offer.

The two legs are also taxed under different heads: a futures leg is ordinarily business income while a delivery-based long is ordinarily a capital asset, and losses do not set off symmetrically between those heads (see how trading losses set off). A hedge that is flat in economics need not be flat after tax.

What the spread is for

A merger spread is the market's running estimate of three quantities at once, and reading it as one number is the error that decides the outcome. The work is decomposition: set a fallback that moves with the market and with what a failure would reveal, set a date from the stage the scheme has actually reached and the queue ahead of it, and only then ask what probability the price implies. On Indian schemes the date deserves the most attention because it has the least discipline: the one approval with a binding deadline is rarely on the critical path, and the tribunal, which usually is, has none.

That is a method rather than a tip, and it carries to every event-driven position: identify what the price is paying for, and check each part against the record.