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Home›
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WS Investments
AddedMar 20, 2024
UpdatedJun 28, 2026
WS Investments

WS Investments

Operating

WS Investment Co.: Law firm's fund since 1978, managed by Mario Rosati. Pre-IPO investor in tech giants.

Location
Palo Alto, CA, US
Founded
1978
Firm
Compare
Portfolio
Employees

WS Investment Co. is the investment fund of law firm Wilson Sonsini Goodrich & Rosati. The fund was formed in 1978 and has been managed throughout by Mario Rosati. All fundraising is internal, with mandatory participation by partners and is occasionally opened to associates.

Among other investments, the fund was a pre-IPO investor in Google, Brocade (partner Larry Sonsini contributed the options he received from his post as a director), Juniper Networks and Avanex.

WS Investments - Portfolio Snapshot

Portfolio activity breakdown across disclosed investments and stages

Total Investments34
Current Portfolio Count22
Total Portfolio Exits3

Top Investment Stages

Seed9 (32.1%)
Series A8 (28.6%)
Series Unknown5 (17.9%)
Series B4 (14.3%)
Pre-Seed2 (7.1%)

Stage Mix

Seed 32%Series A 29%Series Unknown 18%Series B 14%Pre-Seed 7%

Concentration shown as share of disclosed investments by stage.

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WS Investments - Classification

NAICS
  • 520000Finance and Insurance
  • 523000Securities, Commodity Contracts, and Other Financial Investments and Related Activities
  • 523900Other Financial Investment Activities
  • 523990All Other Financial Investment Activities
  • 523999Miscellaneous Financial Investment Activities
SIC
  • 6700Holding And Other Investment Offices
  • 6720Investment Offices
  • 6722Management Investment Offices, Open-end
Show 5 more industry codes
NAICS
  • 525000Funds, Trusts, and Other Financial Vehicles
  • 523910Miscellaneous Intermediation
SIC
  • 6000Depository Institutions
  • 6790Miscellaneous Investing
  • 6799Investors, Not Elsewhere Classified