Follow-ons and block trades

The question behind the question

Interviewers ask about follow-ons and block trades to see whether you understand that "raising equity after an IPO" is not one product, it is a spectrum, and where a specific deal sits on that spectrum determines almost everything about how it gets marketed, priced, and executed. A candidate who treats every post-IPO equity deal the same way is missing the core distinction: how much marketing a deal needs, and how much risk the underwriting bank takes on to get it done, move in opposite directions as you slide from a fully marketed follow-on toward an overnight block trade.

What a follow-on offering actually is

A follow-on offering (sometimes called a secondary offering, though that term specifically should be reserved for a deal selling only existing shares rather than new company shares) is any offering of additional equity by a company that is already publicly traded. Unlike an IPO, a follow-on prices against a real, continuously observable trading price rather than a range built mostly from a comparable companies analysis, which removes a substantial amount of the uncertainty and marketing burden an IPO carries. This is also why the IPO process and follow-on process share a family resemblance, roadshow, bookbuilding, pricing call, but the follow-on version runs faster and leaner at every stage.

Follow-ons can be primary (the company issues new shares and receives the proceeds, diluting existing holders), secondary (an existing large holder, often a founder, early investor, or private equity sponsor, sells shares they already own, with proceeds going to that seller rather than the company), or a combination of both in the same offering. A company raising primary capital to fund growth or pay down debt, and a private equity sponsor using the same offering to sell down part of its remaining stake following an earlier IPO, are both common and can appear side by side in a single deal.

The marketed follow-on

A fully marketed follow-on runs a compressed version of the IPO playbook: the company files an offering document (typically a shelf registration statement filed in advance of any specific deal, letting the company launch an offering quickly once it decides to), management conducts an abbreviated roadshow, often just one to three days rather than the one to two weeks typical of an IPO, and the syndicate desk builds a book the same way it would for an IPO, just against a much shorter timeline. Pricing happens the same evening the roadshow closes, typically at a modest discount, often in the low single-digit percentage range, to the stock's last trade before the deal launched.

The shorter timeline exists because a follow-on has far less to explain: investors already know the company, already have a view on the stock, and mostly need to be convinced that the specific use of proceeds and the specific discount being offered make sense, rather than needing to be introduced to the business from scratch the way an IPO roadshow requires.

The overnight and accelerated bookbuild trade

At the other end of the spectrum sits the overnight deal, sometimes structured as an accelerated bookbuild. Here there is no multi-day roadshow at all: a company or, more often, a large existing holder decides after the market closes to sell a block of stock, the underwriting bank (or banks) canvasses institutional investors overnight to build a book, and the deal prices before the market opens the next morning, all inside a matter of hours. Because there is no time for extensive marketing, these deals typically price at a wider discount to the last trade than a marketed follow-on would, often a discount in the mid-single-digit percentage range or more depending on the deal's size relative to the stock's normal trading volume and how much uncertainty the compressed timeline creates for investors being asked to commit capital on short notice.

An even more compressed version, a pure block trade, involves the bank committing to buy the entire block directly from the seller at a negotiated fixed price, sometimes within minutes of being approached, before reselling the position into the market on its own. Here the bank is taking outright principal risk: it owns the stock the moment the trade is agreed and bears the risk of reselling it at a profit (or a loss) afterward, rather than building a book first and pricing based on demonstrated demand the way a marketed deal or even an overnight bookbuild does.

Shelf registrations and lockup waivers

Two mechanical details make follow-on and block execution possible on such short notice, and interviewers sometimes probe whether you know what enables the speed. The first is the shelf registration statement, a filing a public company puts in place well before it has any specific deal in mind, registering a pool of securities it might sell over the following several years. With an effective shelf already on file, a company can launch an actual offering off of it in a matter of days rather than needing to draft and clear an entirely new registration statement with the SEC each time, which is what makes a marketed follow-on's compressed timeline possible at all.

The second is the lockup agreement itself and how it can be waived early. Standard IPO lockups run 90 to 180 days, but underwriters generally retain the ability to release a specific holder from that restriction early, a lockup waiver, if there is a good business reason and market conditions support it. A private equity sponsor wanting to sell down a stake in an overnight block before its lockup has technically expired needs exactly this kind of waiver, and underwriters weigh a waiver request carefully, since releasing one large holder early can unsettle other locked-up shareholders and signal something about the stock's prospects that the market may read negatively even if the sponsor's own reasons are unrelated to the company's performance.

Why the discount mechanics differ from an IPO

An IPO discount, covered fully in how an IPO actually gets valued and priced, compensates investors for the risk of buying a stock with no trading history at all. A follow-on or block trade discount compensates for something narrower and more mechanical: absorbing a large new supply of shares into the market faster than the stock's normal trading volume could absorb them without moving the price. The size of that discount scales with how large the deal is relative to the stock's average daily trading volume and how much time investors have to evaluate it; a small follow-on in a heavily traded, liquid stock needs only a token discount, while a large overnight block in a thinly traded stock can require a meaningfully larger one to get done at all.

A useful lens for keeping these straight in an interview: a marketed follow-on is usually company-led, tied to a specific primary capital need like funding an acquisition or paying down debt, and it is planned well in advance, often discussed with the company's coverage banker for months before it launches. An overnight deal or block trade is more often seller-led, a private equity sponsor or founder deciding it is a good time to sell down some or all of a remaining stake, and it can be initiated with far less advance planning, sometimes reacting opportunistically to a strong stock price or a lockup expiration rather than following a long-planned capital raise. Recognizing which situation you are looking at, in an interview scenario question or in an actual deal, tells you almost immediately which execution path is likely to apply.

Who initiates each type, and a worked hypothetical

Suppose a company that went public two years ago now trades at $40 per share on solid, steady trading volume, and its board wants to raise $300M of primary capital to fund an acquisition. Given the size relative to the stock's typical trading volume and the straightforward, well-telegraphed use of proceeds, the company and its underwriters choose a marketed follow-on: a short, two-day roadshow, a book that fills comfortably, and a final price of $39, a modest discount reflecting the new share supply being absorbed. Separately, suppose the private equity sponsor that took the company public originally decides, once its lockup has expired, that it wants to sell its entire remaining stake at once rather than trickle it out over time. Given the size of that position and the sponsor's preference for speed and certainty over marketing a full roadshow, the deal runs instead as an overnight bookbuild, priced the next morning at $38.50, a somewhat larger discount reflecting the compressed timeline and the larger relative size of the block, with underwriters having spent the prior evening canvassing large institutional holders rather than running a multi-day process.

Practice question

What is the difference between a follow-on offering and a block trade, and why would a company or shareholder choose one over the other?

Both raise money by selling additional equity in an already-public company, but they sit at different points on a marketing-versus-speed spectrum. A marketed follow-on runs a compressed version of the IPO process, a short roadshow, a book built over a day or two, and it prices at a modest discount to the last trade. It makes sense when the company itself needs to raise a specific, plannable amount of primary capital and has time to run a short marketing process to get the best possible price. A block trade, especially an overnight or accelerated bookbuild, skips the roadshow almost entirely: the bank builds a book overnight or agrees to buy the position outright, and it prices at a wider discount because there's less time for investors to evaluate the deal and less certainty for the bank underwriting it. It makes sense when speed and certainty matter more than optimizing every basis point of price, which is often the case for an existing shareholder, frequently a sponsor or founder past their lockup, who wants to sell a large position quickly without the market having weeks to react to the news that a big holder is exiting.

What the interviewer is listening for: Whether you understand the tradeoff between marketing time and discount size, and can connect deal type to the underlying seller's actual motivation (raising primary capital versus an existing holder monetizing a position) rather than treating all post-IPO equity deals as interchangeable.