Martha MacMillan
Profile Summary
Martha MacMillan is a U.S.-based billionaire associated with Minnesota and the diversified industry, born in 1951. She has an estimated net worth of ~$1.7B. Her recorded federal political giving spans 1980 to 2023 and totals $120,787 across 34 contributions. RTB FEC
Philanthropy
ProPublica nonprofit filings list three Macmillan family foundations with combined assets of $111,127,775. In the most recent filings shown, the Katherine Wells Macmillan Foundation (MN) reported $110,762,761 in assets in tax year 2023 and $0 in grants paid, despite $41,837,081 in total revenue. The Donald A Macmillan Foundation (TX) reported $365,014 in assets in tax year 2023 and $0 in grants paid; overall, the listed foundations show $0 total grants paid. ProPublica 990
Political Activity
FEC records show 34 contributions totaling $120,787 from 1980-01-30 to 2023-10-30. The largest recipients were Romney Victory Inc ($50,000) and the Republican National Committee ($31,800), followed by Klobuchar for Minnesota ($5,400) and Romney for President Inc. ($5,000). By party coding, $59,850 went to Republicans, $4,500 to Democrats, $5,400 to DFL, and $51,037 is 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.