Expert answer

Is buying a foreign parent with a Canadian subsidiary reviewable?

It can be, under two separate federal laws. The Competition Act reaches a purchase of voting shares of a corporation that controls an entity carrying on an operating business in Canada, once its size and voting-share tests are met. The Investment Canada Act applies when a non-Canadian acquires control of a Canadian business, and national security review has no size floor.

Reviewed

A Canadian subsidiary does not stay outside Canadian review just because the buyer is purchasing its foreign parent. Two federal regimes can still apply, and they ask different questions. One looks at competition in the target’s Canadian business, the other at who the buyer is.

The Competition Act looks at the Canadian footprint

Part IX of the Competition Act applies to a proposed acquisition of voting shares of a corporation that carries on an operating business, or controls an entity that does, subject to size tests that count assets in Canada or revenues from sales in, from or into Canada, and to a test of how much of the corporation’s voting power the buyer would hold. An operating business is a business undertaking in Canada to which employees ordinarily report for work. The Competition Bureau says whether notification is required turns on thresholds for the size of the parties and the transaction.

Deals below the threshold can still be challenged

Notification is not the only route. The Competition Bureau says mergers that do not require pre-merger notification may still raise competition concerns and be investigated, and it may challenge a merger that was never notified for a period after closing. Contacting the Bureau before closing is the course it encourages.

The Investment Canada Act looks at the buyer

ISED says all non-Canadians who acquire control of an existing Canadian business are subject to the Investment Canada Act and must file either a notification or an application for review, unless an exemption applies. Which filing a purchase of a foreign parent triggers depends on rules in the Act and in ISED’s guidelines and interpretation notes, so a non-Canadian buyer should check them early. The Act also allows national security review of foreign investments of any size.

Questions to settle first

  • Is the buyer a Canadian or a non-Canadian under the Act?
  • Does the parent control an entity carrying on an operating business in Canada?
  • What are the Canadian assets and revenues, measured as the Competition Act requires?
  • Does the Canadian business touch a sector that raises national security questions?

Sources

This answer is checked against primary sources. Links were last confirmed on the dates shown.

  1. 01
    Innovation, Science and Economic Development CanadaGovernment
    Investment Canada Act
    ised-isde.canada.ca·Checked Oct 1, 2026
  2. 02
    Government of CanadaGovernment
    Competition Act
    laws-lois.justice.gc.ca·Checked Aug 16, 2026
  3. 03
    Competition Bureau CanadaGovernment
    Overview of the merger review process
    competition-bureau.canada.ca·Checked Aug 16, 2026
  4. 04
    Competition Bureau CanadaGovernment
    Notifiable transactions — Form and certificate
    competition-bureau.canada.ca·Checked Aug 16, 2026

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