A transfer restriction is a condition written into the articles of association that controls or limits how shares in a limited company may be transferred. Restrictions let existing owners keep control over who becomes a new shareholder.
The most common are a pre-emption clause, a right of first refusal and a consent clause. A pre-emption clause, for example, gives existing owners the right to buy back shares that have changed hands. Such restrictions must be noted in the share ledger and affect how a transfer of shares is carried out.

A consent clause means the company must approve a transfer of shares before it may take place.
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A right of first refusal clause gives named persons the right to buy shares before they pass to a new owner.
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A pre-emption clause gives existing shareholders the right to buy back shares that have passed to a new owner.
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The articles of association are the basic rulebook that governs how a limited company operates.
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