Where is JSJ's headquarters located?

JSJ's headquarters is located in Grand Haven (United States).

How big is JSJ's investment team?

JSJ has a team of 12, including 8 partners.

How many companies has JSJ invested in?

JSJ has invested in 4 companies, including UV Partners & Sparks Belting.

JSJ - 2026 Investor Profile, Portfolio, Team & Exits

Most viewed in 2019

JSJ is a private equity firm founded in 1919. It is primarily based in Grand Haven, United States. As of Jul 2026, JSJ has a portfolio of 4 companies, comprising 4 funding rounds and 2 acquisitions. The firm primarily invests in companies based in United States. Its portfolio is spread across sectors like Life Sciences and HealthTech. Most recently it acquired stakes in McLoone on Feb 06, 2025.

Overall JSJ portfolio has seen 2 acquisitions, namely Sparks Belting, Hudson Technologies.

JSJ has a team of 12 people, including 8 partners.

Key Metrics

Founded Year

1919

Location

Grand Haven, United States

Portfolio Companies

UV Partners, Sparks Belting & 2 more

Portfolio Sectors

Life Sciences, HealthTech

Portfolio Locations

United States

Acquisition Deals

McLoone, Dake Corp

Investment Deals

UV Partners, Sparks Belting & 2 more

View JSJ's full profile

JSJ has a portfolio of 4 companies. They have invested in a total of 4 companies. Their most recent investment was in UV Partners (Series A round) on Jul 01, 2018. Here are the most recent investments by JSJ:

Date	Company	Round	Amount	Co-Investors
Jul 01, 2018	UV Partners	Series A	2131	-

View all investments by JSJ

JSJ has acquired 2 companies. Their most recent acquisition was of McLoone on Feb 06, 2025. Here are the most recent acquisitions by JSJ:

Acquisition Date	Company	Short Description	Total Funding	Founded Year
Feb 06, 2025	McLoone	Limited information available	-	1954
Nov 25, 2019	Dake Corp	Manufacturer of durable machine tools for metalworking	-	1887

Here is the portfolio snapshot of JSJ:

Investments by Year

The maximum number of investments were made in 2018

Portfolio by Location

Companies are primarily in United States

Portfolio by Sector

Companies are primarily in Life Sciences

JSJ has a team of 12 members including 8 Partners and 3 Principals located in United States, China and 1 more location. JSJ's team does not sit on the board of any company as of now.

Here is a list of top team members in JSJ:

Name	Designation	Location	Board Memberships	Contact Details
Harvey Liang	Partner	Tianjin	-	1 Email
Patrick McCrate	Partner	Tulsa	-	-
Ariful Mondal	Partner	Kolkata	-	-
Bruce Olmsted	Partner	Grand Haven	-	1 Email
F Johnson	Partner	Grand Haven	-	-
Juan Carloos	Partner	-	-	-
Jaspreet Kaur	Partner	Salt Lake City	-	-
Erick Johnson	Principal	Grand Haven	-	1 Email
James Nutt	Principal	Grand Rapids	-	-
Michael Metzger	Principal	Grand Haven	-	1 Email