Sarah MacMillan
Profile Summary
Sarah MacMillan (born 1954) is a U.S.-based billionaire in the diversified industry, associated with California, with an estimated net worth of ~$2.6B. Public records show political contributions spanning 1978 through 2024 and multiple private foundations connected to the Macmillan name. RTB FEC ProPublica 990
Philanthropy
ProPublica-reported IRS Form 990 filings show three foundations: the Katherine Wells Macmillan Foundation (MN, 2023) reported total assets of $110,762,761 and grants paid of $0; the Donald A Macmillan Foundation (TX, 2023) reported assets of $365,014 and grants paid of $0. Across the listed foundations, total reported foundation assets were $111,127,775 and total grants paid were $0, indicating no grantmaking in the reported years. ProPublica 990
Political Activity
Federal Election Commission records show 35 contributions totaling $4,187.47 from 1978-03-08 to 2024-11-02. The largest recipients include the Minnesota Independent-Republican Finance Committee ($2,125) and Independent-Republicans of Minnesota ($1,000), with additional giving to ActBlue ($552.47) and George Bush for President Inc Compliance ($500). The party breakdown shows $3,125 to Republican recipients and $1,062.47 categorized as Unknown. 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.