Leonard Schleifer
Profile Summary
Leonard Schleifer is a U.S.-based healthcare billionaire with an estimated net worth of ~$2.8 billion. SEC records link him to Regeneron Pharmaceuticals and show personal insider filings associated with the company. RTB SEC EDGAR
Business & SEC Activity
SEC EDGAR lists 72 insider filings for Schleifer, including filings involving Regeneron Pharmaceuticals (REGN). Recent filings include Form 4 reports in January 2026, December 2025, and multiple dates in 2024; Form 4 reports changes in an insider's ownership of company securities. The record also includes Form 144 filings in 2024, which are notices of proposed sales of restricted or control securities. SEC EDGAR
Philanthropy
The Schleifer Family Foundation, based in Albany, New York, reported $13,163,102 in assets and $3,030,999 in grants paid for tax year 2023. It reported $78,837 in revenue and $3,032,749 in total expenses that year. ProPublica 990
Political Activity
The most recent 100 federal contribution records on file, covering July 7, 2014 through July 31, 2026, total at least $404,010.43; the FEC reports 107 contributions overall, so these figures cover only the sampled records. The sample includes $250,784.10 categorized as Unknown, $152,789.48 to Democratic recipients, and $436.85 to Democratic–Farmer–Labor recipients. The largest listed recipients were SMP ($120,000), Hillary Victory Fund ($52,700), DSCC ($50,000), Senate Majority PAC ($50,000), and DNC Services Corp./Democratic National Committee ($33,400). FEC
These donations are matched to this person by name only, so some may belong to a different person with the same name: FEC filings can include a donor's employer and city, but our matching does not check them against what we know about this person.
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
These figures cover the 100 most recent of 107 federal contributions on file, not the full record. The total, party split, top recipients and dates below are all computed over that sample, so each is a floor rather than a complete figure.
By Party (in the sample)
Every party in this sample is listed here. The bars are rounded for display; unrounded they total exactly $404,010.43.
Top Recipients (in the sample)
Matched by name only. These donations are matched to this person by name only, so some may belong to a different person with the same name: FEC filings can include a donor's employer and city, but our matching does not check them against what we know about this person.
SEC Filings
Associated Companies
Entities appearing alongside this person in SEC full-text search — an association, not necessarily ownership or control. Follow each link to the primary SEC record to judge for yourself.
Recent Insider Filings
Score Breakdown
The giving score 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 record we hold about this person — net worth, SEC filings, foundation 990s, news coverage, Wikidata. It measures our coverage, not how open the person is. Each further kind of record scores higher, up to eight. Political donation records matched to a person by name alone are not counted: they may belong to someone else with the same name. From October 7, 2026, our own AI-written summary and the profile photo are not counted either — neither is a public record — so grades that leaned on them moved down that day.
Data: SEC EDGAR, ProPublica 990s, GDELT / NewsAPI, Wikidata
Formula (v2): Giving score = 65% x Philanthropy + 35% x Data coverage
Scored on 10/16/2026 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.