Public and private companies differ most in who can own them and how much they have to tell the outside world. A public company sells shares on a stock exchange, files continuous reports with the Securities and Exchange Commission, and answers to shareholders it will never meet. A private company raises money from a limited group of investors, reports almost nothing publicly, and keeps control concentrated among its founders and a handful of backers. That single split, between open ownership with mandatory disclosure and closed ownership with privacy, drives almost every other difference between public vs. private companies: how they raise capital, who sits on the board, how they’re valued, how employees get paid, and what they spend on compliance.
What Each Type Has to Disclose
A public company’s disclosure obligations are permanent. Once it registers securities with the SEC, it must file an annual Form 10-K, quarterly 10-Qs, and a Form 8-K whenever something material happens, typically within four business days of the event.1U.S. Securities and Exchange Commission. Exchange Act Reporting and Registration Each of those filings is public. Competitors, journalists, and individual investors all read the same numbers at the same time.
Insiders carry their own disclosure load. Officers, directors, and large shareholders file a Form 3 within 10 days of becoming an insider, a Form 4 within two business days of any trade, and a Form 5 within 45 days of fiscal year-end to catch anything missed.2U.S. Securities and Exchange Commission. Insider Transactions and Forms 3, 4, and 5 No executive can quietly build or unload a position without the market finding out almost immediately. Regulation FD adds another layer: a public company cannot share material nonpublic information with select investors or analysts without releasing the same information publicly at the same time.3Legal Information Institute. Regulation Fair Disclosure (FD)
Private companies file almost none of this. Their mandatory federal filings are limited to tax returns, chiefly Form 1120 for C corporations.4Internal Revenue Service. Instructions for Form 1120 Any financial reporting beyond taxes is voluntary or contractual. A bank will usually want periodic statements to monitor loan covenants, and a venture capital investor may demand quarterly numbers as a funding condition, but no regulator forces the company to publish anything.
That gap is the single biggest operational advantage private companies hold. They can develop products, negotiate deals, and set pay without competitors parsing their strategy in real time. Public companies live in a fishbowl where every quarterly result gets dissected and every executive stock sale shows up within two days.
Who Controls the Board
Going public reshapes how a company is governed, because the stock exchanges impose their own rules on top of federal law. Both the NYSE and NASDAQ require a majority of the board to consist of independent directors with no material tie to the company. A company that lists through an IPO gets up to one year to reach full compliance with that requirement.5Nasdaq. Nasdaq Rule 5605 – Board of Directors and Committees
Public companies also have to maintain standing committees staffed by those independent directors. The audit committee needs at least three independent members, with at least one qualifying as a financial expert, and members cannot have helped prepare the company’s financial statements within the past three years. The compensation committee needs at least two independent members who evaluate executive pay and set performance targets. The nominating committee, also independent, selects or recommends new board candidates so management can’t handpick its own overseers.
The Dodd-Frank Act layered on another check: public companies must hold a shareholder advisory vote on executive compensation at least once every three years, with a separate vote on the frequency of that vote at least every six years. These say-on-pay votes are nonbinding, but a large “no” vote creates real pressure and often forces revisions.6U.S. Securities and Exchange Commission. Investor Bulletin – Say-on-Pay and Golden Parachute Votes
Private companies face none of this. The board is typically dominated by founders and the largest investors, and no director has to be independent. Seats are usually allocated by investment size, with venture capital or private equity firms negotiating one or more seats as a condition of funding. The people with the most money at stake run strategy directly, and the same small group often handles audit oversight, compensation, and nominations informally.
How Each Raises Money
Access to capital is the main reason companies go public, and the gap between the two fundraising worlds is enormous in both scale and speed.
Public Offerings
Public companies can sell registered securities to anyone. After the IPO, they can return to the market with follow-on offerings, and established companies with at least $75 million in common equity held by non-affiliates can use a shelf registration on Form S-3, pre-registering a block of securities and issuing them in pieces as conditions allow.7U.S. Securities and Exchange Commission. Form S-3 That flexibility lets a public company raise hundreds of millions in days. Public companies can also use their liquid stock as currency for acquisitions, buying competitors without touching their cash.
Private Placements
Private companies raise through placements that rely on exemptions from SEC registration, most often under Regulation D. Rule 506(b) allows unlimited capital from an unlimited number of accredited investors plus up to 35 non-accredited investors who meet a sophistication standard, but the company cannot advertise the offering.8U.S. Securities and Exchange Commission. Private Placements – Rule 506(b) Rule 506(c) permits general advertising but restricts sales to accredited investors whose status the company must take reasonable steps to verify.9U.S. Securities and Exchange Commission. Exempt Offerings
An accredited investor is an individual with income above $200,000 ($300,000 with a spouse) in each of the prior two years, or net worth exceeding $1 million excluding a primary residence. Entities generally need $5 million in assets or investments.10U.S. Securities and Exchange Commission. Accredited Investors Those thresholds effectively limit private fundraising to wealthy individuals and institutional investors.
Private rounds come with strings. Investors typically demand preferred stock carrying liquidation preferences, anti-dilution protection, and board seats. Each successive round dilutes the founders’ stake, sometimes dramatically. A founder who starts with 100 percent might hold 15 to 25 percent by the time a Series C closes.
Who Owns the Shares and Whether You Can Sell Them
Public company ownership is dispersed. Millions of shares sit across institutional investors, mutual funds, index funds, and retail shareholders. No single owner has enough shares to dictate strategy, so the board serves as the intermediary between management and the owners. This is the classic separation of ownership from management.
Private companies concentrate ownership in a handful of parties: founders, their families, and a few institutional investors. Decisions happen faster and with less friction. A private company CEO who also holds a controlling stake can pivot overnight without worrying about proxy votes or short-term stock reactions.
Liquidity follows the same pattern. Public shares trade daily on an exchange, and an investor can execute a sale in seconds at the prevailing price with settlement in one business day. Private shares are inherently illiquid. Selling usually requires finding a buyer through personal connections or a secondary platform, obtaining company approval, and complying with contractual transfer restrictions. Many private investors cannot exit until a specific event occurs, whether that’s an IPO, an acquisition, or a structured buyback. The illiquidity isn’t just an inconvenience; it translates directly into a lower valuation.
The Compliance Cost of Being Public
The Sarbanes-Oxley Act of 2002 imposed internal control requirements that still account for much of what public companies spend on compliance. Section 404(a) requires management to assess and report on the effectiveness of internal controls over financial reporting each year. Section 404(b) requires an independent auditor registered with the Public Company Accounting Oversight Board to separately attest to that assessment.11Baker Tilly. Successfully Navigating SOX 404(b)
A 2025 Government Accountability Office report found that companies with $1 billion to $10 billion in revenue averaged $1 million to $1.3 million in internal SOX compliance costs alone, before external audit fee increases. Companies with operations across 10 or more locations averaged roughly $1.6 million.12U.S. Government Accountability Office. GAO-25-107500, Sarbanes-Oxley Act – Compliance Costs Smaller reporting companies and emerging growth companies receive temporary exemptions from the 404(b) auditor attestation, but the 404(a) management assessment applies to every public filer.
Accounting standards split the same way. Public companies must prepare financial statements under U.S. GAAP as set by the Financial Accounting Standards Board, which the SEC designated as the public company standard setter in 1973 and reaffirmed after Sarbanes-Oxley in 2003.13Financial Accounting Foundation. GAAP and Public Companies Every annual and quarterly filing must conform, and the annual statements must be audited by an independent external auditor.
Private companies get more room. Many use tax-basis accounting for IRS filings and keep separate internal reports that skip the hardest GAAP requirements. Those that do follow GAAP can elect alternatives created by FASB’s Private Company Council, which simplify areas like goodwill, hedge accounting, and variable interest entity consolidation. Private companies can amortize goodwill on a straight-line basis over 10 years instead of running annual impairment tests, for example. External audits aren’t required by any federal regulator; they happen when a lender or major investor demands them. Private companies are generally exempt from Sarbanes-Oxley altogether unless they’re preparing for an IPO and building the controls in advance. The savings run into hundreds of thousands of dollars a year, but the absence of mandated controls also raises the risk of undetected reporting errors or fraud.
How Each Gets Valued and How Investors Get Out
A public company’s valuation updates in real time. Multiply the current stock price by shares outstanding and you have market capitalization. Analysts layer on price-to-earnings and enterprise value-to-EBITDA multiples to judge whether that price looks reasonable. The market digests earnings, management changes, and macroeconomic news almost instantly.
Valuing a private company is a periodic, labor-intensive exercise. Without a stock price, the company engages a qualified independent appraiser to estimate fair market value using discounted cash flow analysis, comparable transaction data, or similar methods. Those valuations drive fundraising, tax reporting, and stock option grants.
Private valuations typically apply a Discount for Lack of Marketability that reduces the figure below what comparable public companies might trade at. IRS data shows these discounts commonly range from about 15 to 35 percent depending on circumstances. Academic studies and court rulings have accepted figures in the 20 to 25 percent range as a reasonable starting point, with adjustments based on size, profitability, and the odds of a near-term liquidity event.14Internal Revenue Service. Discount for Lack of Marketability Job Aid for IRS Valuation Professionals
Any private company that grants stock options must also comply with IRC Section 409A, which requires that the exercise price be set at or above fair market value on the grant date. The safest route is an independent appraisal by a qualified third party with at least five years of relevant experience. That valuation stays valid for up to 12 months unless a material event like a funding round occurs in the interim, at which point a new one is needed before further grants. Companies approaching an IPO often move to quarterly valuations or more. Getting this wrong is costly for employees: if the IRS determines options were granted below fair market value, the affected employees face immediate taxation on vested options, an additional 20 percent penalty tax on the deferred compensation, and accrued interest.
Exit paths diverge sharply. Public company investors have continuous liquidity, can sell on any trading day, and may receive capital back through dividends or buybacks. Private company investors are locked in until a major liquidity event: a sale to a strategic acquirer, a leveraged buyout by a private equity firm, or an IPO that converts private shares into publicly traded ones. Each takes months or years to prepare, and timing depends on market conditions. An investor who needs cash earlier may have to sell at a steep discount on a secondary market, if they can sell at all.
What Employees Get Paid In
Equity compensation looks different on each side of the line, and the differences have real tax consequences for the people receiving the grants.
Public companies have shifted largely to restricted stock units. RSUs are straightforward: the company promises shares that vest over time, and at vesting the employee receives actual stock they can sell on the open market. The value is clear, the liquidity is immediate, and the tax event lands at vesting based on the market price that day.
Private companies rely more on stock options, especially incentive stock options. Options give the employee a right to buy shares at a fixed exercise price set by the 409A valuation, with the upside depending on whether the company’s value rises. The problem is that exercising options at a private company costs cash out of pocket, and the resulting shares may not be sellable for years. Early-stage companies often use monthly vesting after a one-year cliff, with the full schedule running 36 to 48 months. Some grants vest only on an IPO or acquisition, so the equity has no practical value until a liquidity event arrives.
Tax treatment matters here. Public company RSU recipients owe ordinary income tax when shares vest and can sell enough of those shares to cover the bill. Private company employees who exercise incentive stock options may trigger alternative minimum tax liability with no way to sell shares to pay it. That mismatch between tax obligation and liquidity is one of the most common financial traps at private companies.
When a Private Company Loses the Choice
Staying private is not always a choice. Under Section 12(g) of the Securities Exchange Act, a company must register its securities with the SEC and begin public reporting if it has more than $10 million in total assets and its shares are held of record by either 2,000 persons or 500 persons who are not accredited investors.15U.S. Securities and Exchange Commission. Changes to Exchange Act Registration Requirements to Implement Title V and Title VI of the JOBS Act The JOBS Act in 2012 and the FAST Act in 2015 raised those thresholds to give growing companies more room before mandatory registration kicks in.
This is why fast-growing private companies watch their shareholder counts closely. A generous stock option program that puts equity in the hands of hundreds of employees can push a company toward the threshold and force it into public reporting before management is ready. Some companies run structured buyback programs or impose transfer restrictions specifically to keep the holder count below the trigger.
The public-versus-private decision is not permanent either. Companies go public to reach deep capital markets, create a liquid currency for acquisitions, and give employees tradeable equity. They stay private to protect strategic secrecy, avoid millions in annual compliance costs, and keep decisions in the hands of a small group with a long-term view. Some that went public have reversed course through going-private transactions when the scrutiny and expense outweighed the benefits. The underlying tradeoff rarely changes: more transparency and liquidity in exchange for less control and higher cost.