Side Lesson 02: How to Read a 10-K

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1. Why This Is Important

The 10-K is the single document where the SEC requires a public company to tell the truth, in writing, signed by its CEO and CFO under personal criminal liability. It is the closest thing in capital markets to a sworn deposition — and unlike the glossy annual report mailed to shareholders, every word in the 10-K has been re-read by lawyers, auditors, and plaintiffs' counsel hunting for the next class action.

Four reasons every retail investor should know how to read one:

The information is identical to what hedge funds get. The

$400/seat Bloomberg analyst and the $0/seat retail investor are reading the same PDF. Whatever edge a professional has comes from interpretation, not from access. Week 8 already taught the three statements; this lesson teaches the wrapper around them — the parts most retail readers skip and most professionals read first.

It is the only place where the bad news lives. Press releases

curate. Earnings calls spin. The 10-K's Risk Factors and Legal Proceedings sections are written by lawyers whose job is to disclose enough that a future plaintiff can't claim the company hid anything. If something is going to blow up — a regulatory probe, a patent expiration, a customer concentration — it appears here first.

It is searchable. SEC EDGAR full-text search lets you query

every 10-K ever filed for a phrase. Find every company that mentioned "going concern" last quarter. Find every filer with a "material weakness" in internal controls. This is institutional- grade screening for free, and almost no retail investor uses it.

It rewards skill, not speed. A 10-K is 100-300 pages. Reading it

linearly takes a full weekend. Reading it like a professional takes 45 minutes — because you know the eight items that matter, you

Ctrl-F for the four phrases that signal trouble, and you skip the

85% that is boilerplate. This lesson is that 45-minute discipline.

The deeper point is that alpha is rare: what little does exist for a retail investor mostly lives in *reading the filings nobody else reads*. Not in clever models. Not in faster data. In the unglamorous discipline of opening EDGAR and using Ctrl-F.

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2. What You Need to Know

2.1 10-K, 10-Q, 8-K — the three filings that matter

The SEC requires public companies to file three core periodic disclosures. The 10-K is annual, the 10-Q is quarterly (filed three times a year — the fourth quarter is folded into the 10-K), and the 8-K is event-driven, filed within four business days whenever something material happens between the periodic filings.

A 10-Q is a 10-K's lighter cousin: unaudited financials, abbreviated MD&A, and updates to the risk factors only if something has changed. You read 10-Qs to track quarter-on-quarter trends; you read 10-Ks to understand the business. The 10-Q is the heart-rate monitor; the 10-K is the annual physical.

The 8-K is the surprise. Items 1.01 (material agreement), 2.02 (results of operations — earnings releases live here), 4.01/4.02 (auditor change, non-reliance on prior financials), 5.02 (departure of officer), and 8.01 (other material events) are the ones with trading consequences. A 4.02 8-K — "the previously issued financial statements should no longer be relied upon" — is the single worst filing a company can make. It almost always precedes a stock-price collapse and frequently a delisting.

Filing deadlines are tiered by company size. Large accelerated filers (public float above $700M) file the 10-K within 60 days of fiscal year-end and the 10-Q within 40 days. Accelerated filers ($75M-$700M) get 75 and 40. Non-accelerated filers get 90 and 45. A company that misses its deadline files a Form NT (notification of late filing) requesting a 15-day extension. A late filing is itself a signal. When a company can't close its books on time, something is wrong with the books, the people closing them, or both.

A note on fiscal years: not every company runs January–December. Apple's fiscal 2024 ended September 28, 2024. Microsoft's ends June

Walmart's ends late January (after the holiday-return cycle).

Always read the cover page first — the fiscal-year-end date sits in the upper right and changes how you interpret seasonality.

2.2 The standard four-part structure

Every 10-K follows the same regulation-mandated skeleton. Once you have the map, navigation is mechanical.

Part I — the business. Item 1 (Business) describes what the company does, its segments, its customers, its competitors. Item 1A (Risk Factors) is the lawyers' confessional — every non-trivial thing that could go wrong, in descending order of severity. Item 1B (Unresolved Staff Comments) flags any open questions from the SEC review staff; usually empty, but if populated it means the SEC is still arguing with management about disclosure. Item 2 (Properties), Item 3 (Legal Proceedings), and Item 4 (Mine Safety) round out the descriptive section.

Part II — the financials. Item 5 (Market for Registrant's Common Equity) covers buybacks and dividend history. Item 7 (Management's Discussion and Analysis — MD&A) is management's narrative explanation of the financial results, including non-GAAP reconciliations. Item 7A (Quantitative and Qualitative Disclosures About Market Risk) covers interest-rate, FX, and commodity exposures. Item 8 (Financial Statements and Supplementary Data) is the audited Income Statement, Balance Sheet, Cash Flow Statement, and Notes — the ground truth Week 8 taught. Item 9A (Controls and Procedures) contains the internal- controls assertion; if you see "material weakness" here, stop and read carefully.

Part III — governance. Items 10–14 cover directors, executive compensation, ownership, related-party transactions, and auditor fees. Most of this content is incorporated by reference to the DEF 14A (proxy statement) filed separately about a month after the 10-K. The compensation tables and the related-party-transaction disclosure are the highest-value items in this part.

Part IV — exhibits. Item 15 lists every contract, debt agreement, and certification. The exhibit index is dry but useful: this is where you find the actual loan covenants, the customer contracts that were material enough to file, and the CEO/CFO Section 302 certifications.

2.3 The eight items that actually matter

Reading a 10-K cover-to-cover is for new analysts and lawyers. For investing, focus on these eight:

Business segments (Item 1). What is the revenue mix and how is

it changing? A company that "makes phones" but really makes services-attached-to-phones is a different investment than a pure-hardware story. Apple's Services segment going from 12% of revenue in FY15 to 25% in FY24 is the single most important sentence in any Apple analyst's deck — and it is in Item 1.

Risk Factors (Item 1A). Read the first three only. They are

ordered by severity. New risk factors year-over-year are the most important — diff this section against last year's 10-K and the delta tells you what management is newly worried about.

Legal Proceedings (Item 3). Read every named lawsuit. Pay

attention to the disclosed "loss contingency" — companies must disclose a numeric range when loss is probable and estimable. Numeric ranges in Item 3 are real money; vague language is usually nuisance.

MD&A non-GAAP reconciliations (Item 7). Every adjusted EPS,

adjusted EBITDA, or organic-growth figure must reconcile back to the GAAP number. Read what is being added back. "Stock-based compensation" added back to adjusted EPS is a red flag — it is a real recurring expense paid in shares.

Income Statement (Item 8). Revenue, cost of revenue,

operating expenses, operating income, net income. Two-year and three-year columns are required, so you can see the trend immediately.

Cash Flow Statement (Item 8). Operating, investing, financing.

Week 20's lesson: net income can be manufactured; cash flow from operations is harder. The CFO line minus capex is free cash flow, the number that pays buybacks, dividends, and debt.

Notes on Debt (Item 8 notes). The debt note lists every

tranche, its maturity, its interest rate, and its covenants. The maturity wall is in this note. So is the language "in the event of default, the lenders may accelerate." Always check.

Subsequent Events (Item 8 notes, last note). Anything that

happened between fiscal year-end and the filing date that is material. Acquisitions, lawsuits, debt issuances, executive departures. This is where companies disclose the things that happened during the audit window.

2.4 Power tools: EDGAR full-text search and four Ctrl-F strings

Two free tools transform how you read filings.

The first is EDGAR full-text search at efts.sec.gov/LATEST/search- index?q=.... You can search every filing of every public US company for any phrase across any time window. Try "going concern" filed in the last 90 days — you will find every company whose auditor has expressed doubt about its ability to survive twelve more months. That is a screen no retail tool builds because it is too useful to give away for free, except the SEC already gives it away for free.

The second is Ctrl-F. When you open a 10-K, search for these four phrases before reading anything else:

• "going concern" — the auditor has flagged solvency risk
• "material weakness" — internal controls have failed
• "restate" / "restatement" — prior financials were wrong
• "subpoena" / "investigation" — a regulator is involved

If any of these phrases appears, read the surrounding paragraph carefully. If none of them appears, you have just done in 30 seconds what would otherwise take three hours of reading.

A worked example: Apple's FY2024 10-K (fiscal year ended September 28, 2024). Total revenue $391.0B, up 2% from FY23. The five reportable segments are iPhone $201.2B (up 0.3%), Services $96.2B (up 13%), Mac $30.0B (up 2%), Wearables/Home/Accessories $37.0B (down 7%), and iPad $26.7B (up 5%). The single number that matters most in that list is the delta: Services growing double digits while iPhone is flat is the entire story of Apple as an investment in 2024. That sentence comes from Item 1; the segment table comes from Note 12 (Segment Information). Two pages of the 10-K, total reading time five minutes, and you have the thesis.

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3. Common Misconceptions

"The 10-K is too long to read." It is, if you read it

linearly. The eight-item triage above takes 45 minutes for a company you already know and 2 hours for a new one.

"The annual report and the 10-K are the same thing." They are

not. The annual report is marketing. The 10-K is sworn legal disclosure. Always read the 10-K version.

"Risk factors are boilerplate, you can skip them." The first

three are usually company-specific and updated yearly. The delta between this year and last year is the highest-value reading in the entire document.

"Adjusted earnings is the right number to use." Adjusted

numbers are useful for trend analysis only when you understand exactly what management is excluding. GAAP is the contract.

"If the auditor signed off, the financials are correct."

Auditors give a reasonable assurance opinion. Material misstatements have slipped past every Big Four firm. "Material weakness in internal controls" is the auditor admitting they are not confident.

"Subsequent events are minor footnotes." Sometimes. But the

biggest M&A announcements, debt-covenant amendments, and regulatory settlements live in the Subsequent Events note precisely because they happened after fiscal year-end but had to be disclosed.

"EDGAR is hard to use." EDGAR's UI is dated, but full-text

search at efts.sec.gov works perfectly and is free.

"International filings are equivalent." They are not. A

foreign private issuer files a 20-F, which is annual but less detailed and less timely than a 10-K. Defaulting to US-listed names is part of why the disclosure regime is what it is.

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4. Q&A Section

Q1. How long does it take to file a 10-K after fiscal year-end? 60 days for large accelerated filers (public float above $700M), 75 days for accelerated filers, 90 days for non-accelerated filers. Companies that miss file Form NT 10-K asking for a 15-day extension.

Q2. What is the difference between a 10-K and an annual report? The annual report is the marketing document mailed to shareholders. The 10-K is the legally binding SEC filing. Increasingly, large companies print the 10-K as their annual report (Berkshire, JPMorgan), but smaller companies still issue glossy versions separately. Always read the 10-K.

Q3. Are 10-Ks audited? Yes. The financial statements (Item 8) are audited by an independent registered public accounting firm. The rest of the 10-K is reviewed by the auditor for consistency with the financials but not separately audited.

Q4. What does "material weakness" actually mean? It means the company's internal financial controls have a deficiency severe enough that it could result in a material misstatement of the financial statements, undetected. It is the auditor's strongest public negative signal short of refusing to sign.

Q5. Where exactly do I find segment data? Item 1 (Business) gives the qualitative segment description. The quantitative segment revenue/operating-income table lives in the Notes to Financial Statements, usually titled "Segment Information" — typically Note 11, 12, or 13 depending on the company.

Q6. What is "going concern" language? Under PCAOB AS 2415, the auditor must add an emphasis paragraph if there is *substantial doubt about the entity's ability to continue as a going concern* for the next twelve months. It is the auditor warning the market that the company may not survive a year. Almost every 10-K that contains those two words is followed by either bankruptcy, dilutive equity raise, or distressed debt restructuring within 18 months.

Q7. How do I diff this year's 10-K against last year's? The SEC's EDGAR Online Inline XBRL viewer at sec.gov shows side-by-side comparison automatically. Free third-party tools like Last10K or DiffWords (paid) handle the rest. For free, copy-paste both Risk Factors sections into a text diff tool.

Q8. What are XBRL exhibits? Every 10-K filed since 2009 must be tagged in eXtensible Business Reporting Language — a machine-readable markup that lets any tool extract any line item programmatically. This is what powers every "stock data" service you use.

Q9. Should I read all of Item 1A Risk Factors? No. Read the first three (ordered by severity by SEC convention) and the *new ones added since last year*. The remaining 30-50 risk factors are mostly boilerplate copied from peer-company filings and Latham & Watkins templates.

Q10. What about 10-Ks from foreign companies listed in the US? Foreign private issuers file 20-F instead of 10-K. The 20-F is annual, contains similar information, but is filed less promptly (four months after fiscal year-end vs. 60 days) and uses IFRS or home-country GAAP rather than US GAAP. ADRs of TSMC, ASML, Toyota, Novo Nordisk all file 20-Fs.

Q11. How do I find a company's most recent 10-K? Go to sec.gov/edgar, type the ticker into the search box, click Filings, filter by Form Type "10-K". Most recent is at the top. Or use the direct URL pattern: sec.gov/cgi-bin/browse-edgar?action=getcompany& CIK=&type=10-K&dateb=&owner=include&count=40.

Q12. Do I need to read the proxy (DEF 14A) too? For positions you plan to hold longer than a year — yes. The proxy is where executive pay, related-party transactions, and the actual voting items sit. The ratio of CEO comp to median-employee comp, the auditor-fee table, and the change-of-control golden-parachute disclosures are all in the proxy and almost nowhere else.