Cargill MacMillan III
Profile Summary
Cargill MacMillan III (born 1959) is a U.S.-based billionaire in the diversified industry, with an estimated net worth of ~$1.7B. He is listed as being based in Colorado. His recorded political giving and foundation activity show contributions to national party committees and multiple private foundations with varying levels of grantmaking. RTB FEC ProPublica 990
Philanthropy
Across three foundations tied to his name, total reported foundation assets were $23,308,866 and total grants paid were $269,620 (based on the tax years available). Article Iii Foundation (2023) reported $126,310 in assets and $269,620 in grants paid, with $269,620 in revenue and $136,521 in expenses. Aspen Foundation Iii (2015) reported $2,919,956 in assets and $0 in grants paid, and Elkes Foundation Iii (2023) reported $20,262,600 in assets and $0 in grants paid. ProPublica 990
Political Activity
From 2022-10-07 to 2023-06-15, he made 4 reported federal contributions totaling $4,100, all to the Republican National Committee. The party breakdown in the available data shows $4,100 to Republican recipients and no other parties. FEC
U.S. Presence
Philanthropy
Political Contributions
By Party
Top Recipients
Score Breakdown
The PBS is a weighted average of 2 components. The formula is open and versioned — the weight percentages below show how much each component contributes to the final score.
Evidenced charitable giving — built on what they actually give each year, not parked assets. Dominated by generosity (annual giving relative to net worth — the share of your fortune you give), plus the absolute scale of that giving, plus a small nudge for signing the Giving Pledge (a commitment, not a realized action).
Data: ProPublica 990 charitable disbursements, net worth, The Giving Pledge registry
How much sourced, public accountability data exists — net worth, political contributions, SEC filings, foundation 990s, news coverage, and a verified profile. More public disclosure scores higher.
Data: FEC, SEC EDGAR, ProPublica 990s, GDELT / NewsAPI, Wikidata
Formula (v2): PBS = 65% x Philanthropy + 35% x Transparency
Scored on 6/23/2026 on a 0–100 scale. The score uses only the signals we have populated data for. Goal Impact, Controversy, and Community Approval are deferred until that data exists — Phase 1 goal adoption, controversy detection, and community votes respectively.
All data is sourced from public records. Each section links to its original source.