AUM
Estimated $7-8B (based on Lone Star holdings)
Principals
3
Principal Net Worth
$7.3B
Data Flags
Irish citizen (tax purposes), Boston Medical Center philanthropy
Grayken Family Office
SFOHigh ConfidenceDallas, TX / Ireland
Last verified: Jan 17, 2026
Details
- Website
- Unknown
- Source of Wealth
- Private Equity (Lone Star Funds)
- Assets Under Management
- Estimated $7-8B (based on Lone Star holdings)
- Source File
- research/organizations/grayken-family-office.md
- UID
- fo-grayken-family-office
Also Known As
John Grayken Family OfficeGrayken CapitalGrays Creek Capital
Related Entities (3)
Relationship Strength
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Sources (6)
- https://www.bloomberg.com/billionaires/profiles/john-p-grayken/
- https://www.forbes.com/profile/john-grayken/
- https://www.lonestarfunds.com/about-us/team/john-grayken/
- https://www.perenews.com/john-grayken-the-man-behind-the-mandate/
- https://www.wbur.org/news/2017/03/06/boston-medical-center-addiction-center
- https://theorg.com/org/lone-star-funds/org-chart/john-p-grayken
Changelog
- 2026-01-17Upgraded to High confidence - verified net worth via Forbes (#443) AND Bloomberg Billionaires. Added recent activity: Hillenbrand $3.8B acquisition (Oct 2025), AOC $2.3B sale (Mar 2025), Coral Gables acquisition, SENQCIA sale
- 2026-01-16Enriched with full biography (Wharton/HBS, Irish citizenship 1999), Lone Star founding, $95B committed capital, philanthropy, net worth update ($7.3B), updated confidence to Medium
- 2026-01-15Auto-generated from principal John Grayken