William Harris Investors
William Harris Investors is a single-family office headquartered in Chicago. Founded in 1976 by philanthropist and entrepreneur Irving B.

William Harris Investors
William Harris Investors is a single-family office headquartered in Chicago. Founded in 1976 by philanthropist and entrepreneur Irving B. Harris after the sale of the Toni Home Permanent Company to Gillette, the firm manages multi-generational assets and provides investment, wealth planning, and trust services, alongside comprehensive portfolio management across public and private markets, real estate, and alternatives.
General information
Firm type
Single Family Office
Year founded
1976
AUM
—
Location
Region
North America
Country
—
City
Chicago
Corporate office
225 West Wacker Drive Suite 2150
Frequently asked questions
What is William Harris Investors?
William Harris Investors is a single family office headquartered in Chicago.
When was William Harris Investors founded?
William Harris Investors was founded in 1976.
Where is William Harris Investors headquartered?
William Harris Investors is headquartered in Chicago, in the North America region.
What does Altss track for William Harris Investors?
Altss maintains an OSINT-verified profile of William Harris Investors covering investment focus (ESG policy, ticket size, target IRR, currency preference, regional focuses, industry focuses, technological focuses), team (service providers and advisors), deals (company deals and fund commitments), assets (real estate, public market positions, private companies, art and cultural holdings, philanthropy and foundations), and network (club memberships, associations, and event participation). Detailed values are available to Altss subscribers.
What is William Harris Investors's website?
William Harris Investors's public website is www.whi.com. Verified contact details for principals and decision-makers are available to Altss subscribers.
What type of firm is William Harris Investors?
William Harris Investors is classified by Altss as a Single Family Office within the North America region.
How does Altss source intelligence on William Harris Investors?
Altss combines OSINT (open-source intelligence) with regulatory filings, public disclosures, and licensed data partners. Source provenance is tracked to support compliance-ready research workflows.
How fresh is the Altss profile for William Harris Investors?
William Harris Investors's profile is part of Altss's continuous-refresh dataset, with a full update cycle at least every 30 days and priority changes applied as new information is verified.
Company types
Confirmed
Pipeline
Indicated
Negative
Industry focuses
Confirmed
Pipeline
Indicated
Negative
Regional focuses
Confirmed
Pipeline
Indicated
Negative
Technological focuses
Confirmed
Pipeline
Indicated
Negative
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Get accessInvestment stages
Confirmed
Pipeline
Indicated
Negative
Emerging interests
Hard exclusions
ESG policy
Direct deal program
Emerging manager LP program
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Get accessManager maturity preference
Confirmed
Indicated
Ticket size (USD M, min/max)
Preferred fund size (USD M, min/max)
Investment horizon (years, min/max)
Target IRR (%)
Max leverage
Liquidity terms
Currency preference
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Get accessPhilanthropy-only themes
Political donations
Service Providers & Advisors
| Category | Firm | Years Active | Primary Contact |
|---|---|---|---|
Company Deals
| Date | Company | Type | Sector | Geography | Role | Amount | Deal Lead | Co-investors | Insight |
|---|---|---|---|---|---|---|---|---|---|
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Get accessFund Commitments
| Date | Fund | Strategy | Geography | Role | Fund size | Vintage |
|---|---|---|---|---|---|---|
Club Memberships and Associations & Advisors
| Organization | Role | Since | Notes |
|---|---|---|---|
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Get accessEvent & Conference Participation
| Event | Role | Date | Location |
|---|---|---|---|
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Continuous refresh with full update cycles at least every 30 days.
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