William MacMillan
Profile Summary
William MacMillan, born in 1954, is a U.S. billionaire in the diversified industry with an estimated net worth of ~$1.7B RTB. The data provided does not include a business biography or company history, so the profile is limited to his wealth, age, and giving records.
Philanthropy
Foundation filings show three MacMillan-linked foundations with combined assets of $111,127,775 and total grants paid of $3,097,722 ProPublica 990. The Katherine Wells Macmillan Foundation reported $3,097,197 in grants in 2023 on $110,762,761 in assets, while the Donald A Macmillan Foundation reported $525 in grants on $365,014 in assets; the Valerie Macmillan Foundation reported $0 in grants and $0 in assets ProPublica 990.
Political Activity
FEC records show 100 contributions totaling $18,723.24 from 2017-07-27 to 2024-10-26 FEC. The largest recipients were Donald J. Trump for President, Inc. ($5,650) and Trump Victory ($5,400), and the party breakdown shows $6,325 to Republican recipients, $468.54 to Democratic recipients, $2,000 to unknown-party recipients, and $9,929.70 categorized as Unknown FEC.
In the News
No validated news articles were provided in the dataset NewsAPI.
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.