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AUM

$2B+ (estimated based on net worth)

Principals

4

Principal Net Worth

$177.0B

Data Flags

Cargill family heiress; America's largest private company; inherited wealth; Forbes single source for individual ($1.8-2B)

MacMillan Family Office

SFOMedium Confidence

Los Angeles, California

Last verified: Jan 17, 2026

Details

Website
Unknown
Source of Wealth
Inherited (Cargill Inc. - food/agriculture)
Assets Under Management
$2B+ (estimated based on net worth)
Source File
research/organizations/macmillan-family-office.md
UID
fo-macmillan-family-office

Also Known As

Sarah MacMillan Family OfficeMacMillan CapitalCargill-MacMillan Family Office (collective)

Principals (4)

Sarah MacMillanPrincipal (Heiress)OWNS
$177B
William Duncan MacMillan (deceased)Cargill heirOWNS
Sisters (3)Cargill heiressesOWNS
Cargill-MacMillan extended familyVarious stakesOWNS

Team Members (2)

Miller ValueTitle TBD
WORKS_AT
Vince McTitle TBD
WORKS_AT

Related Entities (4)

Cargill, Inc.Subsidiary

~3% stake (inherited)

MacMillan Family FoundationFoundation

Philanthropic vehicle (reported)

Macmillan HoldingsHolding Company
Personal investmentsSubsidiary

Relationship Strength

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Sources (4)

Changelog

  • 2026-01-17Verification review - Forbes confirms $1.8-2B; Cargill family owns ~90% of company ($154B revenue 2025); single source only, keep at Medium
  • 2026-01-16Enriched with principal biography, career history (Cargill inheritance), net worth $1.8-2B, ~3% Cargill stake, family structure (14+ billionaires), updated confidence to Medium
  • 2026-01-15Auto-generated from principal Sarah MacMillan

Engagement & Preferences