Sarah MacMillan
Profile Summary
Sarah MacMillan was born in 1954 and is listed as a U.S. billionaire based in California. Her net worth is estimated at ~$2.6 billion RTB.
Business & SEC Activity
MacMillan is listed in the diversified industry.
Philanthropy
The MacMillan Family Foundation Inc., based in New York, reported $473.6 million in assets, $82.6 million in revenue, $30.4 million in expenses, and $24.7 million in grants paid for tax year 2023 ProPublica 990. A Form 990 is a nonprofit tax filing that reports an organization’s finances and activities.
Political Activity
Federal campaign-finance records show 35 contributions totaling $4,187.47 between March 8, 1978, and November 2, 2024 FEC. The party breakdown lists $3,125 for Republican recipients and $1,062.47 categorized as unknown; named recipients include Minnesota Republican organizations, ActBlue, George Bush for President Inc. Compliance, and MoveOn.org Political Action FEC.
U.S. Presence
Philanthropy
Foundations are matched to a person by name, not by trustee records — so a same-surname family foundation can land here in error. Every entity below links to its full IRS filing; if one doesn’t belong, tell us at hello@skylarkcreations.com and we’ll pull it.
Political Contributions
By Party
Top Recipients
Matched by name only. These are the donations the FEC lists under this person’s name — so a different person with the same name can show up here too.
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 8/31/2026 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.