At least twenty-five per cent, ordinarily — but the CBCA raises that to a majority for a short list of prescribed business sectors, and Ontario's own statute has no residency requirement at all.
Short answer
The ordinary CBCA rule is that at least 25% of a corporation's directors must be resident Canadians, or one director if the board has fewer than four. That threshold jumps to a majority for corporations active in a short, regulation-defined list of sectors — uranium mining, book publishing, book sales and film or video distribution among them. The rule is federal only: an Ontario-incorporated (OBCA) company carries no director-residency requirement at all.
CBCA s.105(3) sets the general floor: “Subject to subsection (3.1), at least twenty-five per cent of the directors of a corporation must be resident Canadians. However, if a corporation has less than four directors, at least one director must be a resident Canadian.” CBCA s.105(3) s.105(3.1) raises that bar to a majority for a corporation that “engages in an activity in Canada in a prescribed business sector,” and the Canada Business Corporations Regulations, 2001 name exactly four such sectors at s.16: “(a) uranium mining; (b) book publishing or distribution; (c) book sales, where the sale of books is the primary part of the corporation’s business; and (d) film or video distribution.” SOR/2001-512, s.16 A film or video distribution company therefore needs a majority-resident board, not a quarter, purely because of its sector.
Ontario repealed its own director-residency requirement in 2021. A company incorporated under the Business Corporations Act (Ontario) can seat a board of any residency mix — the constraint that binds a CBCA company's directors disappears entirely on continuance into Ontario, rather than merely relaxing. Whether a foreign buyer needs to find resident-Canadian directors at all, in other words, turns first on which statute incorporated the target, and only then on its sector.
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