Understanding Primary, Secondary, and Mixed Share Offerings

Hello. This first module establishes the accounting and ownership logic that sits underneath every ECM product you will discuss in the interview. Before comparing IPOs, FPOs, OFS, QIPs, and block deals, you need to be able to look at any equity transaction and answer one decisive question: is capital entering the company, or are existing owners transferring shares to someone else?

By the end of this lesson, you should be able to distinguish a primary issuance, a secondary sell-down, and a mixed offer; trace the cash; and model the effect on shares outstanding, ownership, the issuer’s balance sheet, and mechanical EPS.

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Start with the cash-flow question

An equity offering can look similar from an investor’s perspective: an investor pays cash and receives shares. But the destination of that cash changes the economics entirely.

There are three basic structures:

Structure	What changes hands?	Who receives the consideration?	Does the company issue new shares?
Primary issuance / fresh issue	Newly created shares	The issuer company	Yes
Secondary sell-down / offer for sale	Already outstanding shares	The selling shareholder	No
Mixed offer	Both new and existing shares	Company receives fresh-issue proceeds; sellers receive OFS proceeds	Partly

A useful interview rule is:

Primary means money for the company. Secondary means money for the shareholder. Mixed means separate the two pools of proceeds.

The legal wrapper does not determine this answer by itself. An IPO, for example, can be entirely fresh issue, entirely OFS, or a combination. Similarly, an already listed company may raise fresh capital in an FPO, while a promoter can sell existing shares through an OFS or block deal.

A terminology nuance matters in an Indian ECM interview. “OFS” can be used in two related ways:

1. Broadly, it describes the secondary component of an IPO or FPO, where existing shareholders sell shares.
2. More specifically, it refers to the exchange-based OFS mechanism through which shareholders in a listed company sell shares.

For this lesson, focus first on the underlying economic concept: an OFS is a secondary sale. The detailed distinction between an exchange OFS and a block deal comes later.

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Primary issuance: the company sells newly created shares

In a primary issuance, the company creates shares and sells them to investors. The investors subscribe to the company’s securities, so the company receives the cash.

Suppose a company has $S_0$ existing shares and issues $S_F$ fresh shares at an offer price of $P$.

The core transaction quantities are:

$$\text{Gross primary proceeds}=P\times S_F$$ $$\text{Post transaction shares outstanding}=S_0+S_F$$

If issuer-paid fees are $F_C$, then a simple cash model is:

$$\text{Net company proceeds}=P\times S_F-F_C$$

The gross proceeds initially increase company cash. On the equity side of the balance sheet, paid-up share capital and securities premium increase; transaction costs reduce the net benefit. The company may subsequently use the cash for capacity expansion, acquisitions, working capital, regulatory capital, or debt repayment, but that is a use of proceeds, not the issuance itself.

Ownership effect

Because the denominator rises from $S_0$ to $S_0+S_F$, every existing shareholder who does not buy additional shares owns a smaller percentage of the company.

If shareholder $i$ owns $H_i$ shares before the issuance and does not participate, then:

$$\text{Pre issue ownership}=\frac{H_i}{S_0}$$ $$\text{Post issue ownership}=\frac{H_i}{S_0+S_F}$$

This is ownership dilution. The shareholder’s number of shares has not fallen, but the total share count has risen.

EPS effect

If net income is unchanged at the moment of issuance, the expanded share count causes a mechanical decline in basic EPS:

$$\text{EPS before}=\frac{\text{Net Income}}{S_0}$$ $$\text{EPS after fresh issue}=\frac{\text{Net Income}}{S_0+S_F}$$

This is not automatically economically negative. Investors may accept near-term EPS dilution if the funds can generate attractive future returns. For instance, retiring expensive debt may reduce interest expense, while expansion capital may increase future operating profit. But at closing, before those benefits emerge, the share-count effect is dilutive.

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Secondary sell-down: ownership changes, but the company does not raise capital

In a secondary sale, an existing holder sells part or all of an already-issued position. The seller might be a promoter, founder, PE fund, VC fund, government shareholder, employee, or another strategic investor.

Suppose shareholder $j$ sells $S_O$ shares at price $P$.

$$\text{Gross seller proceeds}=P\times S_O$$

Nothing has been issued by the company, so:

$$\text{Post transaction shares outstanding}=S_0$$

The company’s operating balance sheet does not receive the sale consideration:

$$\text{Change in issuer cash from sale proceeds}=0$$

The selling shareholder’s ownership changes from $H_j/S_0$ to:

$$\frac{H_j-S_O}{S_0}$$

A buyer’s ownership rises by the shares acquired, but the denominator remains unchanged. Therefore, unlike a fresh issue, a pure secondary sale does not dilute all shareholders mechanically. It redistributes ownership among holders.

This distinction leads to a clean interview comparison:

Question	Fresh issue	Secondary sale / OFS
Who gets gross proceeds?	Issuer	Selling shareholder
New shares created?	Yes	No
Shares outstanding change?	Increase	Unchanged
Issuer cash changes?	Increases by net proceeds	No change from the share sale
Existing non-selling holders diluted?	Yes	No, assuming no other issuance
Mechanical EPS effect at closing	Dilutive if earnings unchanged	No effect
Typical core objective	Fund company growth or strengthen balance sheet	Liquidity, partial exit, diversification, public-float objectives

There can be transaction costs, taxes, and market-price movements around a secondary sale. Those matter in practice, but do not alter the core classification: the issuer is not raising equity capital.

Do not confuse a seller’s liquidity with the company’s liquidity

This is perhaps the most common conceptual error. If a PE investor sells ₹10 billion of shares in an IPO OFS component, the PE fund receives the ₹10 billion, subject to costs and taxes. The company does not have ₹10 billion more cash available for expansion or debt repayment.

In an interview, avoid saying, “the IPO raised ₹10 billion,” unless you specify the split. Say instead:

“The transaction had ₹10 billion of total offer value, comprising ₹6 billion of fresh issue proceeds to the company and ₹4 billion of OFS proceeds to existing shareholders.”

That answer demonstrates that you understand both the client objective and the model.

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Mixed offers: one transaction, two economic flows

Mixed deals are common because a company and its shareholders can have legitimate but different objectives at the same time:

• the company needs capital for growth, debt reduction, or regulatory requirements;
• early investors seek a partial exit;
• promoters may need to lower their stake or broaden the public float;
• the market may benefit from a larger freely tradable share base.

A mixed offering combines fresh shares $S_F$ with secondary shares $S_O$.

$$\text{Total offer shares}=S_F+S_O$$ $$\text{Total offer value}=P(S_F+S_O)$$

But total offer value is not the same as company proceeds:

$$\text{Company gross proceeds}=P{S}_F$$ $$\text{Seller gross proceeds}=P{S}_O$$ $$\text{Post transaction shares outstanding}=S_0+S_F$$

The OFS shares add to the number of shares sold to investors, but they do not add to the company’s total share count.

Worked example

Assume the following pre-transaction capitalisation:

Holder	Shares before transaction
Promoter group	70 million
PE investor	20 million
Other existing holders	10 million
Total	100 million

The company offers:

• $30$ million fresh shares;
• $10$ million existing shares sold by the PE investor;
• offer price $P=₹100$ per share.

The transaction model begins with the two cash pools:

$$\text{Company gross proceeds}=₹100\times 30\text{ million}=₹3.0\text{ billion}$$ $$\text{PE investor gross proceeds}=₹100\times 10\text{ million}=₹1.0\text{ billion}$$ $$\text{Total offer value}=₹4.0\text{ billion}$$

The company’s post-transaction share count is:

$$100\text{ million}+30\text{ million}=130\text{ million shares}$$

The PE investor owns $10$ million shares after selling half its stake. The new investors receive $40$ million shares in total: $30$ million newly issued shares and $10$ million transferred from the PE investor.

Holder	Shares after transaction	Post-transaction ownership
Promoter group	70 million	$53.85\%$
PE investor	10 million	$7.69\%$
Other existing holders	10 million	$7.69\%$
New investors	40 million	$30.77\%$
Total	130 million	100.00%

Two different effects occur simultaneously:

1. Primary dilution: promoters and other non-selling holders own a smaller percentage because $30$ million new shares were issued.
2. Secondary sell-down: the PE investor’s shares fall from $20$ million to $10$ million because it sold shares; the cash from those $10$ million shares belongs to the PE investor.

The issuer’s cash increases by ₹3.0 billion before fees. It does not receive the PE investor’s ₹1.0 billion. This is why a mixed transaction must always be modeled in separate primary and secondary columns.

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A compact ECM model: the minimum set of lines

For a first-pass ECM model, use the following inputs:

Input	Meaning
$S_0$	Pre-transaction shares outstanding
$P$	Offer price per share
$S_F$	Fresh shares issued
$S_O$	Existing shares sold
$F_C$	Issuer-paid transaction fees
$H_i$	Pre-transaction shares held by shareholder $i$
$s_i$	Shares sold by shareholder $i$

Then calculate:

$$S_{\text{post}}=S_0+S_F$$ $$\text{Gross company proceeds}=P{S}_F$$ $$\text{Net company proceeds}=P{S}_F-F_C$$ $$\text{Gross seller proceeds}=P{S}_O$$

For a selling shareholder:

$$\text{Post transaction shares held}=H_i-s_i$$ $$\text{Post transaction ownership}=\frac{H_i-s_i}{S_0+S_F}$$

For a non-selling shareholder:

$$\text{Post transaction ownership}=\frac{H_i}{S_0+S_F}$$

The transaction’s classification becomes immediately visible:

If your model shows...	You have...
$S_F>0$ and $S_O=0$	Pure primary issuance
$S_F=0$ and $S_O>0$	Pure secondary sell-down
$S_F>0$ and $S_O>0$	Mixed transaction

Balance-sheet and enterprise-value bridge

At a constant share price and ignoring fees, a fresh issue increases equity market capitalisation because more shares exist, but it also increases cash by the amount raised.

If pre-transaction debt is $D$ and cash is $C$, then:

$${\mathrm{EV}}_{\text{pre}}=P{S}_0+D-C$$

After a primary raise:

$${\mathrm{EV}}_{\text{post}}=P(S_0+S_F)+D-(C+P{S}_F)$$ $${\mathrm{EV}}_{\text{post}}=P{S}_0+D-C$$

So, under this mechanical constant-price assumption, the fresh issue itself does not create enterprise value. It exchanges investor cash for newly issued equity. In reality, the market price may change because investors judge the planned use of proceeds positively or negatively; that is a valuation question, not merely an accounting identity.

A secondary sale has no direct company cash inflow and no share-count change, so it has no mechanical effect on enterprise value at the same share price. Its real impact is more likely to arise through investor perception, free float, liquidity, governance, or the meaning attributed to an insider sale.

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An interview-ready answer

If asked, “What is the difference between a fresh issue and an OFS?” give a structured answer rather than only a definition:

“A fresh issue is a primary issuance: the company creates new shares, receives the proceeds, and increases its share count. That strengthens the balance sheet but dilutes existing holders and is mechanically EPS-dilutive until the capital produces earnings. An OFS is a secondary sale of existing shares: the selling promoter or financial investor receives the proceeds, while the company’s cash, share count, and EPS are unchanged. In a mixed IPO, I would split total deal value between primary proceeds to the company and secondary proceeds to selling shareholders, then model the new share count and post-issue ownership separately.”

That answer is concise, but it covers cash destination, ownership, balance sheet, and share-count effects—the points a Markets interviewer expects you to distinguish.

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Key takeaways

• A primary issuance creates shares, raises cash for the issuer, increases the share count, and dilutes non-participating shareholders.
• A secondary sell-down transfers existing shares, sends proceeds to the seller, and leaves the issuer’s share count and operating balance sheet unchanged.
• A mixed offer must be separated into fresh-issue and OFS components; total offer value is not equal to company proceeds.
• At closing, fresh shares mechanically reduce EPS if earnings are unchanged; a pure secondary sale does not.
• In a transaction model, always separate: shares issued, shares sold, company proceeds, seller proceeds, post-transaction shares outstanding, and post-transaction ownership.

Next, you will map the main participants in an Indian ECM deal—issuer, promoters or selling shareholders, investment banks, investors, exchanges, and SEBI—and connect each party’s incentives to the transaction structure.