This study analyzes ownership and directorship links among larger Canadian-owned corporations. These links have received insufficient attention from Canadian economists. It shows that these corporations did not undergo the radical changes predicted for their counterparts in other countries: proprietor ownership remains high, and the board of directors persists as the centre of power. / Ownership links form the basis for the development and empirical investigation of the "Shadow Group" concept. The taxonomical classification of shadow groups reveals complex structures accompanying diversification strategies. Interlocking directorships exist among "core" corporations inside the groups and are frequent between the shadow groups and the rest of the economy. / Shadow groups were at the heart of mergers and acquisitions between 1978 and 1981. A case study shows that external growth (especially takeovers) is their characteristic tactic for expansion. Hence, the necessity exists for amending economic theories to account for the behaviour of these groups.

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