Forget filings for a minute: dilution is a pie cut into more slices
Your share count can stay the same while your ownership gets smaller. Start with a 100-share story.
Start in plain English
Picture a company as a pie.
On August 1, our fictional company, Pinecone Coffee, has 100 shares in stockholders' hands. For now, ignore how many shares its charter permits and set aside the filing vocabulary. This lesson only counts the 100 shares people actually hold today.
You own 10 shares, so you own:
10 ÷ 100 = 10%
On August 10, the company delivers 25 new shares to a new investor to fund another store. You still own 10 shares, but stockholders now hold 125 shares in total:
10 ÷ 125 = 8%
Your ownership fell from 10% to 8%. That is the basic idea of dilution.
Filings call the total shares currently held by stockholders shares outstanding. The same example can therefore be stated as: outstanding grew from 100 shares to 125. That is the only filing term you need in Lesson 1. Lesson 2 introduces authorized, issued, and Treasury Stock one at a time.
Numbers you do not need yet
The charter ceiling, the total ever issued, and shares repurchased by the company all matter. None is required to understand
10 ÷ 125 = 8%. The next lesson puts them into one ledger.
Dilution does not guarantee a price drop
The company may receive cash, repay debt, or expand when it issues shares. Your percentage becomes smaller, but the business may also become more valuable. Keep two questions separate:
- Did the share count grow? Filings and dated numbers can establish this fact.
- Was the financing worthwhile? That judgment needs much more information.
The only formula you need today
New ownership = your shares ÷ total shares after financing
To measure the percentage reduction in ownership:
Ownership dilution = 1 - old total shares ÷ new total shares
Here, 1 - 100 ÷ 125 = 20%. That means the ownership percentage declined 20%. It does not mean the stock price must decline 20%.
Remember one line
Dilution happens when the denominator grows; keeping the same shares does not preserve the same ownership.
Read the primary source
U.S. Securities and Exchange Commission (SEC): Offering Pathways