In business law, an affiliate is a company connected to another through shared ownership or management control that falls short of full ownership. The SEC puts the affiliate meaning in business this way: an affiliate is any person or entity that directly or indirectly controls, is controlled by, or is under common control with another entity.1eCFR. 17 CFR 230.405 – Definitions of Terms The word doing the real work in that definition is control. It does not require majority ownership. Enough influence over management and policy — through stock, a board seat, or a contract — can be enough.
Affiliate vs. Subsidiary
An affiliate is not a subsidiary. A subsidiary is an entity whose parent holds a controlling interest, which for accounting purposes means owning more than 50% of the voting stock. That level of ownership gives the parent definitive control and forces full consolidation of the subsidiary’s financials into the parent’s.
An affiliate sits in a middle zone: enough influence to matter, not enough to dictate every decision. Two sister companies owned by the same holding company are affiliates of each other. A company that owns 30% of another is likely an affiliate of it. A company that owns 80% has a subsidiary. The lines get drawn at different ownership percentages depending on which regulator is asking, which is where the complexity starts.
Ownership Thresholds That Create Affiliate Status
Different regulators care about different ownership levels, and each threshold reflects a judgment about when a relationship becomes close enough to create risks of self-dealing, hidden losses, or market manipulation.
20% to 50%: Significant Influence Under GAAP
For financial reporting under U.S. Generally Accepted Accounting Principles, owning between 20% and 50% of another company’s voting stock creates a rebuttable presumption of “significant influence.” At that level, the investor uses the equity method of accounting: rather than marking the investment at market value, it records its proportionate share of the affiliate’s profits or losses on its own income statement. Below 20% is a passive investment. Above 50% is consolidation.
The 20% figure is a presumption, not an absolute rule. Shared officers, overlapping directors, material intercompany transactions, technological dependency, or contractual veto rights can establish significant influence with a smaller stake.
5%: SEC Beneficial Ownership Disclosure
In the public markets, the SEC requires disclosure well below the 20% mark. Any person or group acquiring more than 5% of a public company’s voting equity must file with the SEC within five business days.2eCFR. 17 CFR 240.13d-1 – Filing of Schedules 13D and 13G Passive investors use the shorter Schedule 13G. Anyone with activist intentions files the longer Schedule 13D, which requires detail on plans and funding.
10%: Insider Status Under Section 16
Once a person or entity beneficially owns more than 10% of any class of a public company’s registered equity securities, Section 16 of the Securities Exchange Act applies. These holders, along with the company’s officers and directors, must report their transactions in the company’s stock to the SEC and are subject to “short-swing profit” rules that force disgorgement of profits from buying and selling within a six-month window.3U.S. Securities and Exchange Commission. Officers, Directors and 10% Shareholders
80%: Controlled Group and Consolidated Return Thresholds
The IRS treats a parent and its subsidiaries as a “controlled group of corporations” when the parent owns at least 80% of the voting power or total stock value of each subsidiary.4Office of the Law Revision Counsel. 26 USC 1563 – Definitions and Special Rules An “affiliated group” eligible to file a single consolidated federal income tax return requires the parent to own stock representing at least 80% of the total voting power and at least 80% of the total value of each subsidiary.5Office of the Law Revision Counsel. 26 USC 1504 – Definitions
What Follows From Being an Affiliate
The classification is not academic. Affiliate status triggers concrete obligations in four separate areas of law.
Tax Consequences
Companies that share ownership have every incentive to shift income, inflate deductions, and create paper losses that lower the group’s combined tax bill. Several provisions in the Internal Revenue Code are built to stop that.
Controlled group members must share certain tax benefits rather than each claiming them in full. Accumulated earnings credits, the Section 179 expensing limit, and bracket thresholds get divided among members, so a company cannot multiply deductions by splitting into smaller entities.
Section 267 blocks deductions for losses on sales or exchanges of property between related parties when the same persons own more than 50% of both the buyer and seller.6Office of the Law Revision Counsel. 26 USC 267 – Losses, Expenses, and Interest With Respect to Transactions Between Related Taxpayers Selling a depreciated asset to a company you control does not actually part with the economic benefit, so the loss is not allowed.
Section 482 gives the IRS authority to reallocate income, deductions, and credits among entities owned or controlled by the same interests when the reported results do not reflect what independent parties would have agreed to.7Office of the Law Revision Counsel. 26 USC 482 – Allocation of Income and Deductions Among Taxpayers This arm’s-length standard is the IRS’s primary weapon against multinational affiliates parking profits in low-tax jurisdictions through inflated intercompany pricing.8eCFR. 26 CFR 1.482-1 – Allocation of Income and Deductions Among Taxpayers Transfer pricing adjustments routinely run into the hundreds of millions of dollars.
On the benefit side, an affiliated group filing a consolidated return can offset one subsidiary’s losses against another’s profits. The trade-off is that the parent takes on joint and several liability for the entire group’s tax obligations.
Restrictions on Selling Company Stock
Anyone who qualifies as an affiliate under SEC rules faces real limits on selling the company’s stock, even shares bought on the open market. Rule 144 is where those limits live.9eCFR. 17 CFR 230.144 – Persons Deemed Not to Be Engaged in a Distribution and Therefore Not Underwriters
For restricted securities acquired in a private placement or other unregistered transaction, affiliates of SEC-reporting companies must hold the stock for at least six months before selling. For non-reporting companies the holding period is one year.10U.S. Securities and Exchange Commission. Rule 144 – Selling Restricted and Control Securities Shares an affiliate buys in the open market are not “restricted,” but they are still “control securities” subject to the other conditions.
During any three-month period, an affiliate cannot sell more than the greater of 1% of the outstanding shares of that class or, for exchange-listed stock, the average weekly trading volume over the preceding four weeks. For thinly traded over-the-counter stocks, only the 1% figure applies. Sales must go through routine brokerage channels at normal commissions, and neither the seller nor the broker can solicit buy orders. Sales of more than 5,000 shares or more than $50,000 during a three-month period also require filing a Form 144 notice with the SEC.
The restrictions follow people after they leave. Anyone who was an affiliate at any point during the 90 days before a sale remains subject to Rule 144’s conditions. Executives who resign and immediately try to liquidate often find out about this one the hard way.
Beyond those sale restrictions, public companies must disclose all material related-party transactions in their annual (10-K) and quarterly (10-Q) filings, covering terms, size, and business purpose, so investors can judge whether deals are being struck at fair market value.
Antitrust Premerger Notification
The Hart-Scott-Rodino Act requires parties to proposed mergers and acquisitions above certain size thresholds to notify the FTC and the Department of Justice before closing.11Federal Trade Commission. Premerger Notification Program For 2026, the size-of-transaction threshold is $133.9 million.12Federal Trade Commission. FTC Announces 2026 Update of Jurisdictional and Fee Thresholds for Premerger Notification Filings
The affiliate wrinkle: the statute requires that voting securities or assets held by a “person” be calculated by aggregating the holdings of that person and each of its affiliates.13Office of the Law Revision Counsel. 15 USC 18a – Premerger Notification and Waiting Period A buyer that looks well below the threshold on a standalone basis can get pushed over the line once its affiliates’ holdings are added in. Failing to file carries penalties of more than $50,000 per day.
SBA Small-Business Size Standards
Affiliation also decides whether a company counts as “small” for federal contracts and SBA loan programs. The SBA aggregates the employees, revenue, and other size measures of a business with all its domestic and foreign affiliates.14eCFR. 13 CFR 121.103 – How Does SBA Determine Affiliation A 30-employee firm that looks like a textbook small business on its own can be disqualified when a 500-employee affiliate gets counted in.
The SBA’s test is broader than most. Affiliation exists whenever one entity controls or has the power to control another, or when a third party controls both. For joint ventures, each partner must include its proportionate share of the joint venture’s receipts and employees in its own totals.
Keeping Affiliates Legally Separate
Affiliated entities ordinarily keep their limited liability shields: debts and legal claims against one do not automatically reach the others. Courts will “pierce the corporate veil” and hold a parent or sibling liable when the separation between companies is more fiction than reality.
The specific tests vary by jurisdiction, but courts look for the same signals: intermingling of assets, chronic undercapitalization relative to obligations, failure to keep separate books and governance records, and use of one entity as a shell to insulate another from liability. When a parent treats an affiliate like an internal department, the legal separation collapses.
Preserving separation means maintaining distinct bank accounts and financial records, holding separate board meetings with independent agendas, pricing intercompany transactions at arm’s length with proper documentation, and keeping each entity adequately capitalized for its operations. None of it is glamorous. It is the kind of hygiene that either saves or costs millions when a lawsuit lands.
How Contracts Define “Affiliate”
Outside the regulatory context, the definition of affiliate depends on whatever the contract says. Most commercial agreements track the SEC language, focusing on the power to direct management and policies through voting securities, contract, or otherwise. Details vary. Some contracts set a specific ownership floor, often 50%. Others use the vaguer “control” standard, which can capture relationships with no equity component at all.
Whatever definition the contract uses determines the reach of non-compete clauses, indemnification obligations, license grants, and confidentiality protections. A broadly drafted affiliate clause can pull in entities the parties never intended to cover. Reading the affiliate definition before signing seems pedantic until it becomes the only thing that matters in a dispute.
A Note on Affiliate Marketing
The word “affiliate” shows up constantly in digital commerce, where it means something else entirely. Affiliate marketing is a commission-based arrangement in which an independent publisher earns a fee for driving sales or leads to a merchant’s site. The relationship is contractual and performance-based. The affiliate marketer holds no equity in the merchant, shares no personnel, and exercises no influence over operations. None of the accounting, tax, securities, or antitrust rules above apply. When a corporate or regulatory source uses “affiliate,” it almost always means the structural relationship, not a referral arrangement.