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Alpha Investors corporate-action guide

Four announcements. Four different calculations.

Rights issues, new share issues, takeovers and scrip dividends all move value differently. Use the maths to make the mechanics explicit—then do the investment work the formula cannot.

By Brendan Walsh · Updated 30 August 2026

Open access · four free calculators · no sign-up

The organising principle

Separate the announced fact from the investor assumption.

Corporate actions often look complicated because a small number of mechanical terms sit beside much larger questions about value, incentives and risk.

Start with the issuer's announcement, prospectus or scheme document. Put the announced terms into the relevant calculator. Then write down which output is arithmetic, which input is your own assumption and which question still requires judgement.

Alpha Investors corporate-action tools

Read the decision guide ↓
Rights issues

TERP, rights value and cashless take-up

Work out entitlement, subscription cash, theoretical ex-rights price and tail-swallow sizing.

Use the calculator →
New share issues

Listed-company share dilution

Separate share-count growth, ownership dilution, price transfer and unchanged-earnings EPS effects.

Use the calculator →
Takeovers

Merger-arbitrage deal spread

Translate cash, stock or mixed consideration into spread, annualised return and scenario-weighted value.

Use the calculator →
Dividends

Scrip dividend: cash versus shares

Estimate whole shares, residual value and the market-value difference from taking cash.

Use the calculator →

01 · Rights issues

TERP is a reference point, not a forecast.

A rights issue gives existing shareholders an entitlement to buy new shares, normally at a discount. The theoretical ex-rights price blends the cum-rights market value with the subscription cash over the enlarged share count.

TERP = (old shares × cum-rights price + new shares × subscription price) ÷ total post-issue shares

Worked example

A 1-for-4 issue at 400p with a 600p cum-rights price gives a 560p TERP. A holder of 1,000 shares receives a 250-share entitlement and needs £1,000 to subscribe in full. The calculation does not answer whether the recapitalised company deserves that extra £1,000.

  • Check whether rights are renounceable and what your broker will do if you take no action.
  • Distinguish the discount to the pre-rights price from the discount to TERP.
  • Use the broker's operational deadline, which may be earlier than the issuer deadline.
Check the TERP and value of your rights →

02 · New share issues

Dilution is not one number.

A primary issue increases the company's shares outstanding and raises capital. A secondary sale by an existing holder does neither. For investors who do not participate, ownership dilution is the relative reduction in their percentage interest after the new shares are issued.

Ownership dilution = new shares ÷ total post-issue shares

Worked example

If a company with 100 million shares issues 20 million more at 200p while the shares trade at 250p, the share count rises 20% but a non-participant's relative ownership falls 16.7%. A simple cash-adjusted reference value is 241.7p if the proceeds are valued pound-for-pound. That is arithmetic, not a price target.

  • Keep share-count growth, ownership dilution and EPS effects separate.
  • Ask what net proceeds will earn and whether the issue price transfers value to subscribers.
  • Do not label denominator-only EPS arithmetic as a forecast of reported EPS.
See how a new share issue changes your ownership →

03 · Takeovers

The spread pays for uncertainty.

A target trading below the stated consideration offers upside if the transaction closes—but the gap is not free money or a stand-alone market probability. Timing, conditions, costs and the loss if the deal breaks belong in the same calculation.

Cash-deal spread = offer value ÷ target price − 1

Worked example

A 500p cash offer with the target at 470p has a 6.38% gross spread. If it closes in 90 days, the geometric annualised equivalent is about 28.5% before costs. An 85% close case and a 15% break-to-350p case produce an illustrative 477.5p expected value—showing why the downside assumption matters more than the annualised headline.

  • Use definitive fixed consideration and permitted-dividend terms.
  • For stock consideration, include the fixed exchange ratio and the economics of the hedge.
  • Treat the close probability and break prices as your assumptions, never calculator facts.
Calculate the live takeover spread →

04 · Scrip dividends

Equal headline value, different exposure.

A scrip election replaces cash with newly issued shares using the company's published reference price. The exact entitlement is normally rounded down to whole shares, with the fraction handled under the scheme's own terms.

Theoretical scrip shares = dividend value available ÷ published reference price

Worked example

A 1,000-share holding with a 15p dividend has a £150 cash alternative. At a 480p reference price, that equals 31.25 theoretical shares: normally 31 whole shares plus a fractional balance treated according to the scheme. The reference price is not a guaranteed trading price or necessarily a tax cost.

  • Use the published scheme price rather than substituting a live quote.
  • Check whether the fraction is carried, paid, sold on your behalf or forfeited.
  • Do not confuse a new-share scrip with a DRIP that buys shares in the market.
Compare the cash and scrip alternatives →

One event ledger

Match each calculation to the decision it cannot make.

EventAnnounced termsMechanical outputUnpriced question
Rights issue1-for-4 at 400p; 600p cum-rights560p TERP; £1,000 to take 250 rights on 1,000 sharesDoes the repaired business deserve more capital?
New issue20m new on 100m existing at a 20% discount20% share-count increase; 16.7% non-participant dilutionWill the new capital earn enough to create value?
Cash takeover500p offer; 470p target; 90 days assumed6.38% gross spread; 28.5% annualised equivalentIs the spread sufficient for delay and break risk?
Scrip dividend15p dividend; 480p reference price; 1,000 shares£150 cash or 31 whole shares plus a fractionIs retaining equity exposure the better allocation?

The event checklist

Run the numbers. Then name the assumption.

01

What changes?

Cash, share count, ownership, payoff or portfolio exposure?

02

Which figure is theoretical?

Separate arithmetic reference points from prices, forecasts and probabilities.

03

What dominates?

Write down the one judgement—proceeds use, break price, timing or concentration—that drives the decision.

04

When must you act?

Check the issuer terms and your broker's earlier operational deadline.