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23. Estate of Harrison McCain
Net Worth: $3.79 billion
Change from 2017 Ranking: ▲2.4%
Major company holdings: McCain Foods
This side of the McCain clan has the largest share in the family firm, McCain Foods. Last April, the company announced a $65-million expansion of a potato processing plant in Florenceville, N.B., the town where it was founded. The business also made its debut as a tech investor, contributing to Series B funding for Fredericton drone crop-monitoring startup Resson Aerospace, and announced a research program in the works aimed at developing precision agriculture technologies for the potato industry.