Complete Guide to SEC Filings: 10-K, 10-Q, and 8-K

Published on October 06, 2026 | 12 min read

Complete Guide to SEC Filings: 10-K, 10-Q, and 8-K

Key Takeaways

10-K provides a detailed picture of a company's full-year financial performance, business, risks, and operations.
10-Q helps investors understand how the company is performing during the year and what has changed since the last annual report.
8-K is used to communicate significant developments, such as acquisitions, management changes, major agreements, or other important events.
The 10-K gives the big picture, the 10-Q shows recent financial trends, and the 8-K highlights major developments between regular reports.

When you invest in the US stock market, you will come across various terms such as 10-K, 10-Q, and 8-K. At first, these may seem difficult, but they are actually very important documents that provide insight into what is happening at the organisation listed on the US stock exchange.

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Companies listed on US stock exchanges are required to file certain documents with the US Securities and Exchange Commission (SEC) to comply with applicable rules and regulations. These documents contain information on the company's financial performance, business activities, risks, significant events, and other developments. Anyone can access these documents through the SEC's EDGAR system, as they are publicly available.

Among the different types of SEC filings, 10-K, 10-Q, and 8-K are three of the most important ones.

10-K tells an investor about the company’s yearly performance.
10-Q reflects a company’s quarterly performance.
8-K tells you about important events that happen between regular reporting periods.

For an investor, these filings are helpful because they are primary sources of information. Rather than relying solely on press releases, analysts' views, and social media, investors can go straight to these filings and find out what the company has reported during the said period. In this article, we explain what 10-K, 10-Q, and 8-K filings are, why they are important, and more.

What is a 10-K?

A 10-K is the annual report filed by the company with the SEC. It offers investors a view of the company’s business and financial performance for the whole fiscal year.

Think of a 10-K as the company’s report card. If you want to understand a company, the 10-K is one of the best sources to start your research. A 10-K contains more information than just revenue and profit.

A typical 10-K can include details about the company’s business, its financial statements, risk factors, management’s discussion of results, legal proceedings, major shareholders, executive compensation, and other important matters.

A company usually submits one 10-K each year. The deadline changes based on the company's filing status. Some larger companies may file their 10-K sooner than smaller companies.

Information Contained in a 10-K

One of the first sections in a 10-K is the business section, which describes the actual operations of the company.

For example, when researching a tech company, the 10-K describes its products and services, customers, markets, and competitors. Moreover, it might describe how the company earns money.

Another important section is the Risk Factors section. It should be noted that the company is required to disclose risks that could affect its operations. These could include competition, changes in customer demand, regulatory risks, cyber risks, supply chain risks, interest rate risks, foreign exchange risks, and much more.

The risk section is especially helpful, as investors tend to focus more on the growth of the company and forget about the risks associated with the business.

In addition, the 10-K includes the financial statements of the company. They usually include the income statement, balance sheet, and cash flow statement.

The income statement is helpful for understanding the company’s revenues, expenses, and profits.
The balance sheet is helpful for understanding the assets, liabilities, and shareholders' equity of the firm.
The cash flow statement describes the inflows and outflows of cash for the firm.

Management's Discussion and Analysis

Another part of the 10-K is Management's Discussion and Analysis, commonly called MD&A. This section explains the company’s financial and operational results and the events that impact them.

For example, revenue may have gone up by 15%. The numbers tell you that revenue has increased. MD&A explains if the increase came from higher prices, more customers, a new product, or an acquisition. This makes MD&A an important section for investors who want to understand the story behind the numbers.

Also Read: Different Methods to Invest in the US Stock Market: A Complete Guide

What is a 10-Q?

A 10-Q is a quarterly report filed by listed companies with the Securities and Exchange Commission. It gives investors an idea of the company’s position during the period. While the 10-K provides a yearly review, the 10-Q offers updates every three months.

Most public companies in the United States file three 10-Q reports each year. The fourth quarter usually does not have a 10-Q because it is covered by the annual 10-K filing.

For example, a company that follows a calendar year will typically release:

First quarter- 10-Q
Second quarter- 10-Q
Third quarter- 10-Q
Full year-10-K

This gives investors regular updates about the company's financial performance.

Information Contained in 10-Q

A 10-Q gives details for one quarter and the year-to-date period. It includes statements, management discussion, risk factors, and legal issues, and it provides valuable information. The financial statements in a 10-Q are usually shorter than those in a 10-K. They still offer useful insights.

You can check the recent 10-Q to see if revenue is rising, if margins are shifting, if debt is going up, or if cash is dropping. You can also spot any developing trends.

That’s why investors often compare the 10-Q with earlier quarters and with the 10-Q from the same period last year. It helps them track performance over time.

Importance of 10-Q

Businesses can change rapidly. A company that seemed strong six months ago may now have new problems today. Likewise, a company that was struggling last year may now show great improvement in its latest quarter.

The 10-Q helps investors avoid relying on old annual information, giving them fresh data that shows the current state of the company.

For example, imagine a company reported strong results in its 10-K. A few months later, demand for its products starts falling.

The latest 10-Q may show:

Lower sales
Higher inventory
Lower operating margins
Increased borrowing
Lower cash flow

These changes could be important signals for investors.

What is an 8-K?

The 8-K is not the same as the 10-K or the 10-Q.

Unlike an annual or quarterly report, an 8-K is usually filed when a company has an important event to share with investors.

The SEC calls the 8-K a current report. Companies use the 8-K to disclose events that investors might need to know before the next quarterly or annual report. That makes the 8-K especially important for investors who want to keep up with a company. Companies can file multiple 8-Ks during the year whenever events occur that trigger an applicable disclosure requirement.

It is important to note that there can be many reasons for a corporation to file an 8-K. Here are some possible events:

Events related to bankruptcy
Announcements about acquisitions or mergers
Changes in management
Resignations or appointments of directors
Significant agreements
Events relating to financial liabilities
Earnings release
Changes in control of the company
Specific legal events
Vote results

Importance of 8-K for Investors

An 8-K can sometimes have a quicker effect on a stock compared to a 10-K or 10-Q.

For example, a company is trading at $50 per share. Suddenly, the company announces that it has lost one of its major customers. That information could change investors' expectations about revenue and profit.

The company may disclose the event through an 8-K, allowing investors to receive the information without waiting for the quarterly report. This is why investors who actively follow a stock often monitor 8-K filings.

It will be easier to recall the three filings when one considers the timings and reasons behind them.

Difference Between 10-K, 10-Q, and 8-K

The easiest way to remember the three filings is to think about time and purpose.

Filing	Main Purpose	Frequency	What It Tells Investors
10-K	Annual report	Usually once a year	Detailed picture of the full fiscal year
10-Q	Quarterly report	Usually three times a year	Recent financial and business performance
8-K	Current report	Whenever applicable events occur	Important events and developments

Another simple way to look at them is:

10-K: "How did the company perform during the year?"
10-Q: "How is the company doing this quarter?"
8-K: "What important thing just happened?" Once you understand this difference, these filings become much easier to read.

Why Are SEC Filings Important?

One of the biggest advantages of SEC filings is that they provide information from an official source. Investors often hear stories about companies through financial websites, television channels, social media, or investment newsletters. These sources can be useful, but they are secondary sources.

The company's SEC filings are closer to the source. This does not mean that investors should blindly trust every statement in a filing. Companies naturally present their business from management's perspective, and financial statements require interpretation. However, these filings provide a strong foundation for research.

They also make it easier to compare companies. Suppose you are comparing two companies in the same industry. You can look at their 10-K filings and compare revenue growth, profitability, debt, cash flow, risks, and business models. You can then use their latest 10-Q filings to see which company is currently performing better.

Common Mistakes New Investors Make

There are various mistakes that an investor should avoid while looking at these financial documents.

One common mistake is looking only at the company's earnings announcement.
Earnings numbers are important, but they are only part of the story.
Another mistake is reading only the income statement.
A company can report strong profits while having weak cash flow or rising debt. Looking at the balance sheet and cash flow statement can reveal a different picture.
Investors should also avoid ignoring the Risk Factors section.
It may not be the most exciting part of a filing, but it can tell you what could go wrong with the investment.
Finally, investors should not treat one filing as the complete story.
A single quarter can be affected by temporary factors. Looking at several 10-Qs, the latest 10-K, and relevant 8-Ks gives a much better understanding of the business.

The US stock market produces a huge amount of information, and SEC filings are one of the most important sources investors can use. The 10-K, 10-Q, and 8-K each have a different purpose.

The 10-K provides a detailed annual view of the company. It helps investors understand the business model, financial performance, risks, and overall condition of the company.

The 10-Q provides a quarterly update. It helps investors understand what has changed since the last annual report and whether the company is moving in the right direction.

The 8-K focuses on important events. It can alert investors to developments such as management changes, acquisitions, major agreements, earnings announcements, and other significant events. Companies generally use 8-K filings to report qualifying events rather than waiting for the next regular report.

For a beginner, the easiest approach is not to try to read everything at once. Start with the 10-K to understand the company. Then read the latest 10-Q to understand its current financial position. Finally, check recent 8-K filings to see what important events have happened.

FAQs

What is a 10-K filing?

A 10-K is a company's annual report filed with the SEC. It provides a detailed overview of the company's business, financial performance, risks, cash flow, debt, and other important information for the full fiscal year.

What is a 10-Q filing?

A 10-Q is a quarterly report that provides an update on a company's financial and business performance. Most public companies file three 10-Q reports each year, while the fourth quarter is generally covered in the annual 10-K.

What is an 8-K filing?

An 8-K is a current report used to inform investors about important events that happen between regular quarterly or annual reports. These events can include management changes, acquisitions, major agreements, earnings releases, and other significant developments.

What is the main difference between a 10-K and a 10-Q?

The main difference is the reporting period. A 10-K covers the company's full fiscal year and is more detailed, while a 10-Q provides a quarterly update on the company's financial and business performance.

How is an 8-K different from a 10-K and 10-Q?

A 10-K and 10-Q are regular financial reports, while an 8-K is generally filed when a specific important event occurs. An 8-K can therefore provide investors with information between scheduled reporting periods.

Why are SEC filings important for investors?

SEC filings provide investors with information directly from the company. They can help investors understand financial performance, business risks, debt, cash flow, management changes, and other factors before making investment decisions.

Where can investors find 10-K, 10-Q, and 8-K filings?

Investors can find these filings through the SEC's EDGAR database, which provides public access to company filings. It is one of the most useful sources for researching US-listed companies.

Which filing should a beginner read first?

A beginner can start with the 10-K to understand the company's overall business and financial position. After that, the latest 10-Q can be used to understand recent performance, while 8-K filings can help track important events and developments.

About Author

Sachin Gupta

Senior Sub-Editor

is a seasoned financial writer with over eight years of experience across global markets, including Australia, the UK, and New Zealand. He specialises in simplifying complex financial concepts, making them accessible and engaging for a wide range of readers. When he’s not writing or traveling, he can often be found exploring the mountains, drawing inspiration from the calm and clarity of the outdoors.