Signing the share purchase agreement transfers the shares as between buyer and seller. It does not, by itself, update a single corporate record — that takes a separate, deliberate set of filings.
Key takeaways
For a federally incorporated target, section 50 of the Canada Business Corporations Act sets out the corporation's core obligation: it “shall maintain a securities register recording securities issued in registered form,” showing the names and addresses of security holders, the number of securities each holds, and the date and particulars of every issue and transfer. The section is explicit about what registration actually does — “Registration of the issue or transfer of a security in the central securities register … is complete and valid registration for all purposes.”
That is a narrower statement than it might read at first: the register is what makes a transfer effective and complete for corporate-law purposes, distinct from whatever the purchase agreement says about when beneficial ownership passes. A buyer who has signed and funded but whose name has not been entered in the register has not finished the job.
A treadstonelaw.ca piece on post-purchase record-keeping lays out the practical checklist that follows a closing: “board resolutions approving the share transfer and, where the articles or a unanimous shareholders' agreement require it, any consents or waivers of rights of first refusal,” along with director resignations and new appointments and an officer appointment resolution, plus “an updated shareholder register showing the new owner.” Together with new share certificates issued to the buyer and a copy of the purchase agreement kept with the corporate records, that is the core of what a minute book needs to show a closed transaction actually closed.
One Ontario closing-mechanics guide is explicit about the deadline that sits on top of the internal paperwork: “Directors, officers and the registered office must be updated under the Corporations Information Act within 15 days of the change.” That is a separate obligation from anything in the minute book — it is the public record, and it runs on a fixed clock regardless of how quickly the internal resolutions get signed.
The updating-corporate-records piece adds the sensible last step: once the internal and public records are current, obtain a fresh certificate of status to confirm the public record actually reflects what was filed — useful for the buyer's own diligence file, and often required by a lender financing part of the price.
Section 146 of the CBCA treats a unanimous shareholder agreement, or USA, as running with the shares rather than sitting alongside them. Subsection (3) states that “a purchaser or transferee of shares subject to a unanimous shareholder agreement is deemed to be a party” to it, and subsection (4) gives that purchaser real teeth if nobody said anything: the buyer “may, no later than 30 days after they become aware” of the USA's existence, “rescind the transaction.”
That is a genuinely dangerous gap for a buyer who did not ask the question directly during diligence and did not receive a clear negative answer in the disclosure schedule. A USA does not have to be filed publicly to bind the buyer — confirming its existence, or its absence, in writing is worth a specific representation in the purchase agreement, not an assumption drawn from a clean corporate search. It sits alongside the other closing-day surprises covered in what can still go wrong on the closing day.
The 15-day Corporations Information Act filing above is Ontario's own regime, sitting on top of whatever a federally incorporated corporation owes Corporations Canada for its own notice of change. A target incorporated provincially outside Ontario will have its own companies-office filing and its own deadline — the mechanics above describe the federal securities-register rule and the Ontario public filing specifically, and neither should be assumed to describe every province without checking that province's own corporate statute.
The CBCA does not leave the record-keeping obligation as a suggestion. Section 20 backs it with a real consequence: a corporation that fails to comply “without reasonable cause” is liable to a fine of up to $5,000. A buyer who inherits a target's sloppy corporate records — a securities register several transfers out of date, minute-book resolutions never actually signed — is not just buying an administrative headache. Bringing the record current, including the buyer's own transfer, is what closes that exposure, which is one more reason the 15-day clock above is worth calendaring the day the deal closes rather than filed away as a reminder for later.
The updating-corporate-records guidance above recommends obtaining a fresh certificate of status once the internal and public records are current, and the reason is practical rather than ceremonial: a lender financing part of the purchase price, or a landlord asked to consent to an assignment, will often want independent confirmation that the corporation's public filings genuinely reflect the ownership and management the buyer is representing. A certificate obtained before those filings are current simply confirms the stale record — the sequencing matters as much as the step itself.
A buyer closes the purchase of all the shares of an Ontario-incorporated target on a Tuesday. By the following Monday, the corporate lawyer has filed the board resolutions approving the transfer, resigned the outgoing sole director, appointed the buyer's nominee, cancelled the seller's share certificate and issued a new one to the buyer, and updated the securities register to show the new holder — all inside the 15-day Corporations Information Act window that started running the day the directors changed.
Three weeks later, reviewing an old email thread the seller's counsel had forwarded during diligence, the buyer's lawyer notices a reference to a “shareholders' agreement” that was never produced. A direct question to the seller confirms a unanimous shareholder agreement existed between the seller and a former co-owner, terminated only informally years earlier and never formally revoked in writing. Because the buyer raised it and got a documented answer inside days of first suspecting it, the 30-day rescission clock under s.146(4) never became a live issue — it would have, had the thread gone unnoticed for a month.
No. The agreement transfers the shares as between the parties, but the corporation's own securities register has to be updated separately — under the CBCA, registration in that register is what makes the transfer “complete and valid” for corporate-law purposes, and it does not happen by itself.
Under CBCA s.146, the buyer is deemed a party to it regardless. If the buyer was not given notice of it and later finds out, the Act gives the buyer 30 days from becoming aware of the agreement to rescind the entire transaction — which is why confirming its existence or absence belongs in the representations, not left to a clean corporate search.
The 15-day Corporations Information Act deadline described here is Ontario's own filing requirement. Every province runs its own companies-office regime with its own forms and timelines — the specific 15-day figure should not be assumed to apply outside Ontario without checking the target's own province of incorporation.
A short call is enough to map which registers, resolutions and public filings your specific closing actually needs.
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