A stock offering is a regulated sale of company shares to investors. When the company issues brand-new shares, the cash lands on its balance sheet. When existing owners sell shares they already hold, the money goes to those sellers and the company gets nothing. Both kinds of sale run through the Securities and Exchange Commission, and both are the main way companies tap the capital markets or let early backers cash out.
Why Companies Sell Stock
Growth funding is the usual reason. Building facilities, entering new markets, and acquiring competitors cost more than most companies earn, and selling equity avoids the interest payments that come with borrowing. That trade-off is especially attractive for companies growing fast without being highly profitable yet.
Companies also issue shares to pay down existing debt, swapping high-interest loans for equity and making themselves more attractive to future lenders. Some healthy companies raise money simply to hold a larger cash cushion or keep dry powder for opportunistic deals.
A separate motivation drives secondary sales. Founders, employees, and early investors holding large blocks of stock often want to diversify or lock in returns. In those transactions the company receives nothing; the entire point is liquidity for the sellers, though the added trading volume tends to make the stock easier to buy and sell.
Types of Stock Offerings
Initial Public Offering
An initial public offering is the first time a private company sells shares to the general public. It converts the company from privately held to publicly traded, and from that point on the company must comply with SEC reporting requirements and stock exchange rules. The NYSE and Nasdaq each impose their own financial and shareholder-distribution standards a company has to meet before its shares can list.1NYSE. Overview of NYSE Initial Listing Standards2Nasdaq. Nasdaq Initial Listing Guide
Follow-On Offering
A follow-on offering is a sale of additional shares by a company that is already public. Companies run them to fund acquisitions, strengthen the balance sheet, or give early investors a way out. Because the issuer already files regular SEC reports and has a trading record, the regulatory process is shorter and cheaper than an IPO.
Primary Shares vs. Secondary Shares
Within any offering, shares fall into two buckets based on where the money ends up. Primary shares are newly created by the company, and the proceeds go into the company’s treasury. Secondary shares are existing shares sold by current owners such as venture funds or founders, and the proceeds go to those sellers. Many deals blend both: the company raises fresh capital through primary shares while early backers sell part of their holdings through secondary shares in the same transaction.
A pure secondary offering, with no new shares created, raises nothing for the company. Its purpose is to increase the free float and give insiders an exit. A pure primary offering is entirely about funding the business.
Shelf Registrations and At-The-Market Offerings
Public companies that meet certain eligibility rules can file a shelf registration on Form S-3, pre-registering securities for later sale on a continuous or delayed basis.3eCFR. 17 CFR 230.415 – Delayed or Continuous Offering and Sale of Securities The heavy regulatory work happens once, and the company can then sell shares off the shelf when conditions are favorable. For well-known seasoned issuers, the shelf becomes effective immediately upon filing.4eCFR. 17 CFR 230.462 – Immediate Effectiveness of Certain Registration Statements
An at-the-market offering is a shelf offering where the company sells shares gradually into the existing trading market at prevailing prices, rather than as a single block at a fixed price.3eCFR. 17 CFR 230.415 – Delayed or Continuous Offering and Sale of Securities If a stock you own has an active at-the-market program, new shares can enter the market on any trading day.
How the Offering Process Works
A typical IPO runs about four months from the kickoff meeting to the first day of trading, and preparation often starts 12 to 18 months earlier as the company gets its financials audit-ready. Each phase pulls in the company, its lawyers and accountants, and the investment banks handling the sale.
Selecting Underwriters
The company hires one or more investment banks to run the offering. The lead bank, called the bookrunner, oversees the transaction and usually pulls in a syndicate of other banks to help distribute shares. Underwriters are paid through the “underwriting spread,” the difference between what they pay the company for shares and what they resell them for. For mid-sized IPOs raising between $30 million and $200 million, that spread is almost always exactly 7%.5ScienceDirect. The “7% Solution” and IPO (Under)pricing Very large offerings in the billions can negotiate spreads under 2%, while small deals may effectively pay more than 7% once expense allowances are counted.
Due Diligence and the Registration Statement
The underwriters investigate the company’s finances, operations, and legal standing, both to protect investors and to limit their own liability. Lawyers draft the registration statement, most often on Form S-1. It has two parts: the prospectus, which every potential buyer receives and which contains the business description, risk factors, management discussion, and audited financial statements; and a second part filed with the SEC that holds additional exhibits.6Securities and Exchange Commission. What Is a Registration Statement?
SEC Review and the Quiet Period
Federal law prohibits selling securities to the public without an effective registration statement.7Office of the Law Revision Counsel. 15 USC 77e – Prohibitions Relating to Interstate Commerce and the Mails After filing, the SEC’s Division of Corporation Finance reviews the document and typically sends written comments asking for clearer disclosure or more information. Companies usually go through two to four rounds of comments; initial comments generally arrive within 30 calendar days. Once everything is resolved, the company asks the SEC to declare the registration effective.8Securities and Exchange Commission. Filing Review Process
Between filing and effectiveness the company is in what’s informally called the quiet period. Securities law defines “offer” broadly enough to sweep in communications that might stir public interest in the shares, so the company and its underwriters have to be careful about what they say. Violating those restrictions is known as gun-jumping. The SEC does allow routine business communications and limited statements about the status of the offering.9Investor.gov. Quiet Period
Testing the Waters and the Roadshow
The JOBS Act, expanded by a 2019 SEC rule to cover all issuers, lets companies hold “testing the waters” meetings with qualified institutional buyers and accredited investors before or after filing, to gauge appetite without taking binding orders.7Office of the Law Revision Counsel. 15 USC 77e – Prohibitions Relating to Interstate Commerce and the Mails The formal roadshow follows in the final weeks before pricing. Management and the underwriters meet with big institutional investors over one to two weeks, and the underwriters build an order book tracking how many shares each institution wants and at what price. That demand drives final pricing.
Pricing, Allocation, and the Greenshoe
The night before trading opens, the underwriters and the company agree on a final offering price balancing capital needs against demand. Shares are allocated to the institutions that placed orders, and the company receives its net proceeds, after the spread, on settlement, typically one business day after pricing.
Most IPO underwriting agreements include an over-allotment option, called a greenshoe, letting the underwriters sell up to 15% more shares than the base deal for up to 30 days after the IPO.10Securities and Exchange Commission. Excerpt From Current Issues and Rulemaking Projects Outline It’s the only price stabilization tool the SEC allows. If the stock trades above the offer price, the underwriters exercise and deliver more shares. If it drops, they can buy shares in the open market to support the price and cover their short position.
Public Offerings vs. Private Placements
The dividing line is regulatory. Public offerings require full SEC registration and are open to anyone who wants to buy. Private placements rely on exemptions from registration and are limited to a smaller group of investors, in exchange for a faster, cheaper, more confidential process.
Most private placements use exemptions under Regulation D. Rule 506(b) bars the company from advertising or publicly soliciting investors. It allows unlimited accredited investors plus up to 35 non-accredited investors in any 90-day period, and the non-accredited investors must receive detailed disclosure.11U.S. Securities and Exchange Commission. Private Placements – Rule 506(b) Rule 506(c) reverses the advertising restriction: the company can market publicly, including online and on social media, but every purchaser must be accredited, and the company has to take reasonable steps to verify that status rather than take the investor’s word for it.12U.S. Securities and Exchange Commission. Exempt Offerings
An individual qualifies as accredited by having a net worth above $1 million excluding a primary residence, or by earning more than $200,000 annually ($300,000 with a spouse or partner) in each of the prior two years with a reasonable expectation of the same going forward.13U.S. Securities and Exchange Commission. Accredited Investors The primary residence exclusion comes from the Dodd-Frank Act.14U.S. Securities and Exchange Commission. Accredited Investor Net Worth Standard Certain licensed professionals, such as Series 7, 65, or 82 holders, also qualify regardless of income or net worth.
Private placements can close in weeks, cost far less, and keep financials out of public view, but the shares are typically illiquid. Buyers can’t freely resell them the way public investors can, which narrows the buyer pool and usually means a lower valuation than a public offering would produce. Public offerings are longer and more expensive, but they reach the broadest capital pool and create a freely tradeable market.
Alternative Paths to Public Markets
Direct Listings
In a direct listing, a private company becomes publicly traded without issuing new shares or hiring underwriters. Existing shareholders sell directly to the public on the first day of trading, and the opening price is set by market demand rather than by an underwriter’s pricing committee.15Securities and Exchange Commission. Types of Registered Offerings Because no new shares are created, the company raises no fresh capital through the listing itself, and existing holders avoid the dilution of a traditional IPO. The trade-off: without underwriters marketing the shares and stabilizing early trading, the company needs enough brand recognition to draw investor interest on its own. Historically only a small number of large, well-known companies have gone this route.
SPACs
A special purpose acquisition company is a shell company that raises money through its own IPO with one purpose: to later acquire a private operating company. The SPAC has no business of its own; the IPO proceeds sit in a trust while the sponsors search for a target. The acquisition, called a de-SPAC transaction, takes the target public without a traditional IPO.16Investor.gov. What You Need to Know About SPACs – Updated Investor Bulletin
SPACs typically have two to three years to complete a deal. If they don’t, the trust funds go back to investors and the SPAC faces potential delisting. Investors in a SPAC IPO usually receive units made up of common shares and warrants that give the right to buy additional shares at a set price later. SEC rules adopted in 2024 tightened disclosure and liability requirements for SPACs, pulling them closer to traditional IPOs.16Investor.gov. What You Need to Know About SPACs – Updated Investor Bulletin
How Offerings Affect Existing Shareholders
Dilution
When a company creates and sells new primary shares, existing shareholders own a smaller percentage than they did before. If a company with 10 million shares outstanding issues 2 million new ones, a holder who owned 1% now owns roughly 0.83%. Earnings per share also drops, because the same total profit is divided across more shares. That’s why the announcement of a dilutive offering often triggers a short-term price decline. A pure secondary offering, where existing shares just change hands, doesn’t cause dilution because the share count stays the same.
Lock-Up Agreements
In most IPOs, insiders (employees, founders, and large shareholders) agree not to sell their shares for a set period after the offering. The standard lock-up runs 180 days, though specific terms vary by deal. Securities law requires the company to disclose the lock-up terms in its prospectus.17Investor.gov. Initial Public Offerings: Lockup Agreements When the lock-up expires, the sudden supply of newly sellable shares can push the price down, so if you hold a recently public stock, keep an eye on that date.
Resale Restrictions Under Rule 144
Beyond contractual lock-ups, federal rules restrict reselling certain shares. Under SEC Rule 144, holders of restricted securities from an SEC-reporting company must wait at least six months before selling. If the company doesn’t file regular SEC reports, the wait is one year.18Securities and Exchange Commission. Rule 144 – Selling Restricted and Control Securities
Company affiliates (officers, directors, and large shareholders) face additional volume limits even after the holding period ends. An affiliate can’t sell more than the greater of 1% of outstanding shares or the average weekly trading volume over the prior four weeks, measured in rolling three-month periods. Non-affiliates who have held their restricted shares for at least a year can sell without volume caps at all.18Securities and Exchange Commission. Rule 144 – Selling Restricted and Control Securities