What Is Dilution? A Plain-English Guide for Canadian DIY Investors

Dilution is what happens to your slice of a company when it issues more shares. You own the same number of shares, but each one is a smaller piece of the business — and earnings, cash flow and dividends are split across more shares.

Educational glossary entry — not a recommendation. Examples are hypothetical.

Direct answer

Dilution is the reduction in existing shareholders’ ownership percentage (and often in per-share earnings) caused by new shares being issued — through equity raises, stock-based pay, convertible securities, warrants, or share-paid acquisitions. Measure it as new shares ÷ existing shares. Dilution isn’t automatically bad: if the company earns more on the new money than the cost of the shares it issued, per-share value can still rise (“accretive”). The test is always per share, not total.

Where dilution comes from

Source	How it shows up	Typical size	Where to find it
Equity raise (bought deal, marketed offering, private placement)	Lump of new shares, often at a discount	Can be 5–20%+ in one go	News release, prospectus supplement on SEDAR+
Stock options, RSUs, PSUs	Slow annual creep	Often 0.5–3% a year	Notes to financial statements; management information circular
Convertible debentures / preferreds	New shares if converted	Depends on conversion price	Notes; diluted EPS calculation
Warrants	New shares if exercised	Common in small caps and miners	Notes; financing news releases
Share-paid acquisitions	Target holders receive your company’s shares	Can be large	Deal news release, circular
Dividend reinvestment plan (DRIP) issued from treasury	Small ongoing issuance, sometimes at a discount	1–3% a year at some REITs and utilities	Distribution/DRIP disclosure

Basic vs diluted EPS

Companies report two earnings per share figures under IFRS (IAS 33). Basic EPS uses the weighted average shares actually outstanding. Diluted EPS adds shares that would exist if in-the-money options, warrants and convertibles were exercised or converted (options and warrants use the treasury stock method). A wide gap between the two tells you a lot of potential dilution is sitting in the capital structure.

Hypothetical	Shares	Net income	EPS
Basic	100M	$200M	$2.00
Diluted (options + convertible add 8M)	108M	$200M*	$1.85

*Convertible interest saved is added back to net income in a real diluted EPS calculation; ignored here for simplicity.

Is this raise good or bad? A quick check

Question	Reassuring answer	Warning sign
Why raise?	Funding a specific, high-return project or deal	Paying down a debt crisis, or no clear use
How big?	Small relative to shares outstanding	20%+, or repeated raises every year
At what price?	Near market price	Deep discount, plus warrants sweeteners
Per-share math	FFO/EPS/cash flow per share rises after the deal	Totals rise but per-share figures fall
Insider participation	Insiders buying in the offering	Insiders selling alongside

The full triage of equity-raise filings for stocks you already own — prospectus supplements, material change reports and how fast to act — is in SEDAR+ alerts and filing types.

Related reading

• How to read quarterly earnings for TSX companies (basic vs diluted share counts)
• How to read non-GAAP metrics critically (stock-based pay add-backs)
• What is free cash flow? — track it per share
• Documenting sell criteria before you buy (dilution as a kill criterion)

Sources

• IFRS Foundation, IAS 33 Earnings per Share (basic and diluted EPS, treasury stock method).
• National Instrument 44-101 Short Form Prospectus Distributions and 44-102 Shelf Distributions (how Canadian equity raises are filed).

Media credits

• Hero: “Mont Blanc Lavender Purple ink on Water.jpg” by Luigi Crespo, CC BY 2.0, via Wikimedia Commons. Cropped and resized to 1280×720. Real photograph, not AI-generated.

By Andrew · stocksummarizer.com