Seth Klarman
Profile Summary
Stocktwits described Seth Klarman as a billionaire investor and reported on investments by his Baupost Group. NewsAPI RTB reports an estimated net worth of ~$1.5B. RTB
Business & SEC Activity
Stocktwits reported that Baupost took a new position of nearly $13 million in Pershing Square Inc. during the second quarter of 2026 and established a nearly $137 million position in CME Group. NewsAPI The outlet also reported that Baupost increased its Amazon and Alphabet holdings, with Amazon becoming its largest disclosed equity holding. NewsAPI
Philanthropy
Form 990 filings show that the Boston-based Klarman Family Foundation reported $744,037,214 in assets, $72,505,265 in revenue, and $109,524,195 in expenses for tax year 2023. ProPublica 990 The foundation reported paying $96,090,690 in grants that year. ProPublica 990
Political Activity
FEC filings show at least 100 federal contributions in the most recent 100 contributions on file, covering December 17, 2025, through June 30, 2026; those sampled contributions totaled $1,221,700. FEC The sample allocated $1,189,200 to Democratic recipients, $18,500 to recipients of unknown party, $10,500 to independent recipients, and $3,500 to Republican recipients. FEC The largest recipients in the sample were the DCCC and DSCC, at $450,000 each; the California Democratic Party, Democratic Party of Wisconsin Federal, and Maine Democratic Party each received $10,000. 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.
In the News
Stocktwits reported in August 2026 that Baupost's disclosed equity portfolio added Pershing Square and CME Group while increasing Amazon and Alphabet positions. NewsAPI 247wallst.com reported that Klarman had exited Vaxcyte by May 2026. NewsAPI
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 1,864 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 $1,221,700.
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.