What it means
Materiality
What is the legal standard?
The Supreme Court set the modern test in TSC Industries v. Northway (1976) and applied it to securities fraud claims in Basic Inc. v. Levinson (1988). Information is material if there is a substantial likelihood that a reasonable investor would view it as significantly altering the total mix of information available. The inquiry depends on the facts, and the Court has rejected bright-line rules. In Basic, for example, the Court declined to treat preliminary merger talks as immaterial as a matter of law. Materiality is judged in context and often after the fact, which is why companies usually decide with legal advice and a record of the reasoning.
Is there a numeric threshold?
No safe number exists. Accountants and auditors often use a rule of thumb of around 5 percent of a financial statement item as a first step. The SEC staff's Staff Accounting Bulletin No. 99 (1999) says it has no objection to such a rule of thumb as an initial step, but that relying only on quantitative benchmarks is inappropriate, and that misstatements below 5 percent can still be material depending on circumstances. Courts have also rejected formulaic tests. A small number can matter if it changes a trend, a target or a result investors watch closely.
What qualitative factors matter?
The SEC staff's bulletin lists qualitative factors that can make a small item material. The table gives illustrative examples drawn from that kind of analysis. It is not a complete or authoritative list.
| Question | Why it can matter |
|---|---|
| Does it change a loss into a profit, or the reverse? | Investors watch the direction of results |
| Does it affect whether a target or analyst expectation is met? | Expectations move share prices |
| Does it concern an important business segment or trend? | Small amounts can signal bigger changes |
| Does it affect compliance with laws, covenants or contracts? | Consequences can be large |
| Does it involve management compensation or concealment? | Intent and conduct affect credibility |
| How did the market react to similar news before? | Past reactions can indicate importance |
Why does materiality matter to communications?
Materiality connects to most investor communications decisions. It affects:
- Whether an event triggers a current report. See Form 8-K.
- What can be said privately to analysts and investors. See Regulation FD and selective disclosure.
- What can be said on an earnings call or in guidance.
- Timing and content of announcements such as M&A news, leadership changes and incidents.
- Whether statements are complete enough not to mislead.
How do teams make materiality calls?
- Identify the information and who knows it.
- Convene a small group, usually legal, finance and investor relations, with communications.
- Assess quantitative and qualitative factors, and consider how investors and analysts would view the news in context.
- Decide on disclosure, timing and method, and who may speak.
- Record the analysis and the decision, and revisit if facts change.
- Restrict who has the information, and control trading windows where appropriate.
Illustrative materiality memo outline (example only)
- Facts and date known
- Quantitative impact
- Qualitative factors considered
- Conclusion and reasoning
- Disclosure plan and approvals
What mistakes are common?
- Relying on a single percentage as a safe harbor.
- Deciding under time pressure without recording the reasons.
- Treating early-stage news, such as preliminary talks, as automatically immaterial.
- Letting communications teams make the call without legal input.
- Different people inside the company telling different stories.
Rules and case law change and depend on the facts. Securities counsel should make or review every materiality judgment.
Frequently asked questions
What is materiality?
It is the legal test for whether information is significant enough that a reasonable investor would consider it important in making an investment or voting decision.
Is 5 percent the line for materiality?
No. Five percent is a common starting rule of thumb in accounting, but the SEC staff and courts say it is not a safe harbor, and qualitative factors can make smaller items material.
Who decides what is material?
The company makes the first judgment with legal and finance advice. Courts and regulators may review it later, with hindsight.
Does material mean the same as important?
Roughly, but the legal test is specific. It asks about a reasonable investor and the total mix of information, not about what matters to the company.
What if the company is unsure?
It should get legal advice early and, where there is doubt, lean toward careful handling, such as limiting who knows and planning broad, timely disclosure.
Related terms and services: Regulation FD, Selective disclosure, Form 8-K, Guidance, Quiet period, Investor relations glossary, Financial communications glossary, and corporate communications services.
Sources
- Federal Register, Staff Accounting Bulletin No. 99 (August 19, 1999)
- Akin Gump, Recent Federal Appellate Court Guidance on the Materiality Standard
- FindLaw, SEC Issues Staff Accounting Bulletin on Materiality
By the 5W Editorial Team. Reviewed by a human editor before publication. Updated October 28, 2026.