How to Read a 10-K for Red Flags in an Acquisition Target

Updated October 2026 · 7 min read · Anweshna

The map: which items to read first

Item numbers and contents are from the SEC's Form 10-K and Regulation S-K.^[1][2] Smaller reporting companies are not required to provide Item 1A,^[1] so a missing risk-factor section in a small company's filing is not itself a red flag.

Item 1A: separate the boilerplate from the signal

Regulation S-K asks for a discussion of the material factors that make an investment speculative or risky. It discourages generic risks that could apply to any company, and requires any that are included to sit at the end under "General Risk Factors".^[2] In practice, most risk-factor sections are still long, and most of what they describe has not happened.

Three readings separate signal from noise:

• Has it happened, or could it happen? "We could be adversely affected by allegations of violations of anti-corruption laws" is a hypothetical. "In March, we received a subpoena relating to..." is an event. Read the verbs.
• Is it specific to this company? A named customer, product, facility or regulator is signal. Generic macroeconomic risk is not.
• Did it change? Compare this year's risk factors with last year's. A new risk factor, or a hypothetical that has become a past-tense event, is often the most important sentence in the filing.

Item 3: legal proceedings, and what is left out

Item 3 calls for material pending legal proceedings, other than ordinary routine litigation incidental to the business.^[1][3] Two details matter for a buyer:

• Regulation S-K lets a company omit a claim primarily for damages if the amount involved doesn't exceed 10% of consolidated current assets, unless it shares issues with other proceedings.^[3] So small cases can be absent by design, and a cluster of similar small cases may still matter.
• Some proceedings must be disclosed regardless, including material bankruptcy proceedings, material proceedings where a director, officer or 5% holder is adverse to the company, and certain environmental proceedings.^[3]

Read the contingencies note in the financial statements alongside Item 3. Litigation that management considers reasonably possible but not probable often appears there with more detail.

Going concern: the most important sentence in a filing

Under US GAAP, management must disclose when conditions raise substantial doubt about the company's ability to meet its obligations within one year after the financial statements are issued, and must say whether its plans alleviate that doubt.^[4] Search the notes for "substantial doubt". If it appears, read it before anything else. We cover what it means for a buyer in What Does a Going Concern Warning Mean for a Buyer?

Auditor changes: Item 9 and the 8-K

Item 9 covers a narrow case: after an auditor change, a material transaction accounted for differently from how the former auditor apparently would have required.^[1][6] Anything there is serious. The change itself is usually announced earlier, on Form 8-K under Item 4.01, which requires the disclosures set out in Item 304 of Regulation S-K.^[5][6] Those include:^[6]

• whether the auditor resigned, declined to stand for re-election or was dismissed;
• whether either of the past two audit reports carried an adverse opinion, a disclaimer, or a qualification or modification as to uncertainty, audit scope or accounting principles;
• whether the audit committee recommended or approved the change;
• whether there were disagreements with the former auditor.

An auditor resignation close to a filing deadline, or one followed by a smaller firm, deserves a phone call to whoever you can reach. Form 8-K also has a separate item, 4.02, for non-reliance on previously issued financial statements: the formal way a company says earlier numbers can't be relied on.^[5] Check the target's 8-K history for both.

Item 9A: material weaknesses

A material weakness in internal control over financial reporting means the company has told you its own controls over the numbers you are valuing have a significant gap. Note whether it is new, whether a remediation plan exists, and whether it touches revenue, inventory or the close process.

Item 13: related-party transactions

Item 13 draws on Item 404 of Regulation S-K, which requires disclosure of transactions since the start of the last fiscal year, or proposed ones, over $120,000 in which a related person has a direct or indirect material interest. For smaller reporting companies the threshold is the lower of $120,000 and 1% of average total assets over the last two years.^[1][7] Read for leases from founders, loans to executives, and suppliers owned by family members. Then ask the question the filing doesn't answer: will these continue after closing, and on what terms?

A 20-minute first pass

1. Search the notes for "substantial doubt".
2. Read Item 9 and Item 9A.
3. Pull the target's recent 8-Ks and check Items 4.01 and 4.02.
4. Read Item 3, then the contingencies note.
5. Diff Item 1A against the prior year, and read only what changed.
6. Read Item 13.

This won't find everything. It finds the issues that most often change a decision, in the time it takes to read one section in full.

Where software helps

A screening tool reads the whole filing, not just the items above, and checks every finding against the text it quotes. Anweshna's accuracy figures are measured on real SEC filings: on our most recent completed run, the deal-blocking gate scored 94.1% precision and 84.2% recall across 20 annotated filings and 35 labelled category-cases. The sample is small enough that one case moves the figures several points; the method is on our accuracy page.

Bottom line

Read a 10-K in the order the risk sits, not the order it is printed: going concern, auditor, controls, litigation, what changed in the risk factors, and related parties. Then read the verbs: a past tense is an event, and a "could" usually isn't.

Screen a 10-K for red flags →