An equity offering is a sale of company stock to investors in exchange for capital. Instead of borrowing money and paying it back with interest, the company hands out ownership stakes, and investors get a claim on future profits and voting rights in return for cash upfront. The proceeds typically fund expansion, research, debt payoff, or acquisitions. How the sale actually works depends on whether the company is going public for the first time, is already listed on an exchange, or wants to bypass the public markets entirely.
The Main Types of Equity Offerings
Initial Public Offerings
An initial public offering, or IPO, is the first time a private company sells stock to the general public. The company shifts from private ownership to trading on an exchange such as the New York Stock Exchange or Nasdaq. To make that jump, it files a registration statement with the Securities and Exchange Commission, most commonly on Form S-1, which lays out finances, business model, risk factors, and how the money raised will be used.1U.S. Securities and Exchange Commission. What Is a Registration Statement The SEC reviews the document and often sends multiple rounds of questions before letting the offering move forward.
Follow-on Offerings
A company already trading on an exchange can sell additional stock through a follow-on offering, sometimes called a secondary public offering. There are two versions. In a primary follow-on, the company creates and sells new shares, increasing the total share count and raising fresh capital. In a secondary follow-on, existing large shareholders like founders or venture capital firms sell their own shares. The company sees no new money in that case; ownership just changes hands.
Companies that have been filing with the SEC for at least twelve months and meet certain size and compliance thresholds can use the streamlined Form S-3 instead of the heavier Form S-1.2U.S. Securities and Exchange Commission. Eligibility of Smaller Companies to Use Form S-3 or F-3 for Primary Securities Offerings Form S-3 incorporates existing public filings by reference, so the document itself is much shorter.
At-the-Market Offerings
An at-the-market offering lets a public company drip new shares into the open market at prevailing prices instead of dumping them all at once at a fixed price. A broker-dealer handles the sales over days, weeks, or months, and the company controls the timing and volume. This avoids the steep discount that typically accompanies a large follow-on, but it works best for stocks with enough daily trading volume to absorb the extra shares without a noticeable price drop. Companies use a shelf registration on Form S-3 to set one up, which gives them flexibility to raise capital when conditions are favorable.
Private Placements
Private placements skip the full SEC registration process by selling shares directly to a small group of investors. They rely on exemptions under Regulation D, most commonly Rule 506(b) or Rule 506(c).3U.S. Securities and Exchange Commission. Regulation D Offerings The distinction matters. Rule 506(b) prohibits general advertising of the offering; Rule 506(c) allows open advertising but requires the company to take concrete steps to verify each investor’s accredited status.4U.S. Securities and Exchange Commission. Assessing Accredited Investors Under Regulation D Under 506(b), a reasonable belief that the investor qualifies is enough. Under 506(c), the company may need to review tax returns, bank statements, or get written confirmation from a broker, attorney, or CPA.
Most buyers in a private placement must be accredited investors. For individuals, that means a net worth above $1 million excluding a primary residence, or annual income above $200,000 ($300,000 with a spouse or partner) in each of the prior two years with a reasonable expectation of the same this year.5U.S. Securities and Exchange Commission. Accredited Investors The tradeoff for skipping registration is that privately placed shares are restricted. Investors generally cannot resell them on the open market for at least six months if the company files reports with the SEC, or one year if it does not.6U.S. Securities and Exchange Commission. Rule 144 – Selling Restricted and Control Securities
Rights Offerings
A rights offering gives existing shareholders the first chance to buy newly issued shares, usually at a discount to the current market price. The company distributes transferable rights to each shareholder in proportion to current holdings, and those rights work like short-lived options. Own 2% of the company before the offering, receive enough rights to buy 2% of the new shares. Shareholders who don’t want to participate can sell their rights to other investors before expiration.
How a Public Offering Actually Gets Done
Preparation and Choosing Underwriters
The process begins long before any paperwork reaches the SEC. The company hires one or more investment banks to act as underwriters, together forming an underwriting syndicate. The underwriters conduct deep financial and legal due diligence, help structure the deal, and advise on offering size and price range. This phase can take several months, and the company’s lawyers, auditors, and management team are all pulled in heavily.
Filing and SEC Review
The underwriters and the company’s lawyers prepare the registration statement, typically Form S-1 for an IPO. Federal securities law makes it illegal to sell or even offer to sell securities without an effective registration statement on file, so getting this right is critical.7Office of the Law Revision Counsel. 15 USC 77e – Prohibitions Relating to Interstate Commerce and the Mails SEC staff reviews the filing and usually sends back several rounds of comments asking for clarifications or additional disclosures. The exchange continues until the SEC declares the registration effective.
The Preliminary Prospectus and Roadshow
Before the SEC signs off, the company distributes a preliminary prospectus, nicknamed a “red herring,” to potential investors. It contains everything the registration statement contains except the final price and share count. The underwriters use it during the roadshow, a series of presentations to institutional investors in major financial centers, to pitch the company and gauge appetite. Investors submit non-binding indications of interest, and those responses help the underwriters build an order book and tighten the price range.
Pricing and Settlement
Once the SEC declares the registration effective, the underwriters and management settle on a final offer price, typically the night before trading begins. That price reflects the demand gathered during the roadshow and current market conditions. Shares begin trading the next morning. Under current SEC rules, most securities transactions settle one business day after the trade date, known as T+1.8U.S. Securities and Exchange Commission. SEC Chair Gensler Statement on Upcoming Implementation of T+1 On settlement day, the company receives the proceeds and the shares are formally delivered to investors.
What Underwriters Actually Do
Due Diligence and Legal Exposure
Underwriters don’t just sell shares. They stake their reputation and their legal exposure on every offering they touch. Federal law lets anyone who buys stock in a public offering sue the underwriter if the registration statement contained a material misstatement or omitted an important fact.9Office of the Law Revision Counsel. 15 USC 77k – Civil Liabilities on Account of False Registration Statement The only escape is the due diligence defense: the underwriter has to prove it did a reasonable investigation and had real grounds to believe the statements were true when the registration became effective. That is why underwriters spend weeks digging through the company’s financials, contracts, and legal risks before the offering.
Firm Commitment Versus Best Efforts
How much risk the underwriter absorbs depends on the deal structure. In a firm commitment offering, the underwriter buys every share from the company outright and then resells them to investors. If demand falls short, the underwriter is stuck holding unsold stock. Most large IPOs and follow-on offerings use firm commitments because the guaranteed capital gives the company certainty. In a best efforts arrangement, the underwriter only agrees to try to sell the shares. Anything unsold stays with the company, and the offering may raise less than the target.
Fees and the Greenshoe
Underwriters earn a fee called the gross spread, expressed as a percentage of the total offering. For moderate-sized IPOs, a 7% gross spread has been the industry norm for decades. That percentage drops on very large offerings, where billion-dollar deals have seen spreads below 2%. Before any member firm can participate in a public offering, FINRA reviews the underwriting terms and confirms they are not unfair or unreasonable.10FINRA. Corporate Financing Rule – Underwriting Terms and Arrangements
Most underwriting agreements also include an overallotment option, commonly called a greenshoe. This lets the underwriters sell up to 15% more shares than originally planned. If demand is strong and the price rises after trading begins, the underwriters exercise the option to buy those extra shares from the company at the offering price and sell them into the market. If the price falls, the underwriters can buy shares on the open market at the lower price to cover the overallotment, which helps stabilize the stock. The option typically expires 30 days after the offering.
What the Company Can and Cannot Say During the Offering
Section 5 of the Securities Act sharply limits what a company can say while an offering is in progress. Before the registration statement is filed, the company cannot make written offers to sell its stock at all. Between filing and effectiveness, the only written offer permitted is the prospectus itself. Violating these rules, known as gun-jumping, can trigger a forced cooling-off period that delays the entire IPO, rescission rights that let buyers demand their money back, and strict liability for any misleading statements that weren’t properly vetted.
In practice, the company enters a quiet period that begins when it engages its underwriters and extends through 25 days after the offering date. During this window, management should avoid public statements about revenue forecasts, growth prospects, or industry trends. The SEC reads “offer” broadly enough to cover new corporate ad campaigns, media interviews about the company’s future, and social media posts, and applies the same restrictions to digital communications as to traditional ones. Even a comment as innocuous as “we expect to continue to grow” can attract scrutiny. Roadshow presentations to institutional investors are the one sanctioned channel for marketing the stock during this period.
What It Means for Existing Shareholders
Dilution
Whenever a company issues new shares, the ownership stake of every existing shareholder shrinks. Own 1% of a company before an offering that grows the total share count by 20%, and your stake drops to roughly 0.83%. That’s dilution, and it hits earnings per share directly. The same net income divided across more shares produces a lower EPS, which can pressure the stock price even when actual profitability hasn’t changed.
Whether dilution hurts shareholders over the long run depends on what the company does with the money. If the capital funds a project that earns more than the cost of the dilution, shareholders come out ahead. If it gets burned on a bad acquisition, the dilution was a pure loss. Rights offerings exist specifically to address this, giving current shareholders the chance to buy their proportional share of new stock and hold their ownership percentage steady.
Lock-up Periods
After an IPO, company insiders and early investors are typically barred from selling their shares for 180 days. This restriction doesn’t come from federal law. It comes from contractual lock-up agreements negotiated between the underwriters and the company’s directors, officers, and major shareholders. The underwriters insist on lock-ups to keep a flood of insider selling from tanking the price in the weeks after the offering. If founders and executives holding large blocks unloaded them immediately, it would swamp the new market for the stock and hurt investor confidence.
Lock-ups also send a signal that insiders are staying in rather than cashing out at the first opportunity. When the period expires, insider selling often increases and the price sometimes dips. Investors track lock-up expiration dates closely for exactly that reason.
Life After the Offering
Going public is not a one-time event. Once a company completes an IPO, it takes on ongoing reporting obligations that last as long as the stock trades publicly. The SEC requires annual reports on Form 10-K and quarterly reports on Form 10-Q. Deadlines depend on size: large accelerated filers must file their annual report within 60 days of fiscal year-end, while smaller non-accelerated filers get 90 days. Quarterly reports are due within 40 to 45 days after each quarter ends.
Insiders face their own disclosure requirements. Directors, officers, and anyone holding more than 10% of any class of the company’s stock must file a Form 3 within ten days of becoming an insider to disclose initial holdings.11U.S. Securities and Exchange Commission. Insider Transactions and Forms 3, 4, and 5 After that, every purchase or sale of company stock is reported on Form 4 within two business days. These filings are public. A Form 5 is due within 45 days of fiscal year-end to catch any transactions that slipped through unreported during the year.
These obligations carry real costs. Legal, accounting, and compliance expenses for a public company run well into six figures each year, and companies that were private before the IPO often underestimate how much management time ongoing compliance really consumes.
Direct Listings as an Alternative
Not every company that wants to trade publicly needs a traditional IPO. In a direct listing, existing shares begin trading on an exchange without underwriters buying and reselling them. There is no roadshow, no bookbuilding, and no underwriter spread. The market itself sets the opening price based on buy and sell orders on the first day of trading.12U.S. Securities and Exchange Commission. Statement on Primary Direct Listings
Both the NYSE and Nasdaq now allow direct listings. NYSE rules even let companies sell newly issued shares and raise capital through a direct listing, not just facilitate sales by existing holders. The company still files a registration statement with the SEC, so disclosure requirements are essentially the same as an IPO. What disappears is the underwriter infrastructure: no guaranteed purchase, no price stabilization, no overallotment option. That makes direct listings cheaper but riskier. Without an underwriter managing share allocation and stabilizing early trading, first-day price swings can be large. Direct listings tend to work best for well-known companies with strong brand recognition that don’t need underwriters to generate investor interest.