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Friday, Apr 3, 2026
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Family Fortunes

James Slavik & Family
Chairman, Director
Mark IV Capital


THE MONEY: Family controls a sizeable stake in W.W. Grainger (NYSE: GWW), a supply company from Lake Forest, Ill., valued at about $24 billion. Beneficial ownership of company shares predates Grainger’s IPO in 1967.

THE MARK: Newport Beach’s Mark IV, founded in 1974, makes direct investments in commercial real estate, both in existing properties and new development. It also makes investments in private equities and venture capital. Slavik is also a founder and manager of Emerald Bay Ventures LLC, a private investment company.  

THE NUMBERS: W.W. Grainger shares are up nearly 40% year-over-year, boosting the stake of family’s varied interests in the company past $1 billion. Slavik, who regulatory filings indicate held a 6.5% beneficial stake in the company as of 2019, stepped down from the company’s board in 2020, after 30 years of service. Replaced on board by another family member who is reported to live in the St. Louis area, and whose beneficial stake in the company tops 8%, according to filings.

CONTROL: Slavik has been on prior editions of our Wealthiest list. He has previously contended that he’s just one of many beneficiaries in the supply company, and that his own worth is too low for our listings.

VENTURES: Serves on the advisory board for the Cove Fund, a seed capital fund affiliated with UCI Applied Innovation; is a founding director for UCI Applied Innovation.

PHILANTHROPY: Has served as a director of the Hoag Hospital Foundation.

• NET WORTH: $1.1 million
• SOURCE OF WEALTH: W.W. Grainger stock, real estate investments

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