SJE Company History

1975
Company Founded
Stephen P. Johnston registers Electro Systems as a business and begins production of the Tank Alert alarm system in his garage.
1977
Business Incorporated
sj electro systems inc logo
The business is incorporated and renamed S.J. Electro Systems, Inc.
1980
New Building Addition
old building
An addition is built that doubles the size of the facility.
1984-1986
INC Magazine
inc magazine covers
S.J. Electro Systems, Inc. makes INC magazine’s list of the “500 fastest growing privately held companies in the nation” three years running.
1987
ESOP Adopted
S.J. Electro Systems Board of Directors adopts an Employee Stock Ownership Plan (ESOP).
1988
New Building
construction of old building
A new building! S.J. Electro Systems, Inc. completes and occupies a new 30,000 square foot pre-cast concrete manufacturing building.
1992
Control Panels Added
control panels
S.J. Electro Systems, Inc. adds a new product line and establishes expertise in designing and manufacturing control panels (Rhombus Technology).
1992
New Logo Introduced
sje logo in 1992
With the creation of the Rhombus Technology panel line, SJE gets a new logo redesign.
1994
Founder Retires

Founder Stephen P. Johnston retires as CEO of SJE.

1994
Lois Solheim Becomes CEO
Lois Solheim is named the new CEO.
1997
SJE Rhombus
sje rhombus logo

S.J. Electro Systems, Inc. begins doing business as SJE Rhombus.

1998
100% Employee Owned, Building Expansion
old sign

SJE Rhombus becomes 100% employee-owned and 33,000 sq. ft. was added to the existing manufacturing building. Lois Solheim retires as CEO. Laurie Lewandowski is named the new CEO.

1998
Laurie Lewandowski Becomes CEO
laurie lewandowski

Laurie Lewandowski becomes CEO after Lois Solheim retires.

2002
Tamarack Engineering Acquired
tamarack engineering logo

SJE Rhombus acquires Tamarack Engineering, an embedded controls engineering firm located near Minneapolis, MN.

2004
PCB Production
pcb team

Printed Circuit Board production moves from C&D Electronics to SJE Rhombus in Detroit Lakes, MN. Surface mount PCB equipment is installed and production for the Embedded Controls Group begins.

2005
Control Works, Inc., Acquired
control works inc logo

SJE Rhombus acquires Control Works, Inc., a custom control panel facility located in Milford, Ohio.

2007
Suzhou Facility Added
old suzhou building

SJE Rhombus opens a facility in Suzhou, China to better serve pump OEMs currently producing products in China.

2007
Compucon Co. Acquired

SJE Rhombus acquires Compucon Co. in New Hope, MN, increasing their engineering and PCB capabilities.

2008
Best Controls Co. Acquired
best controls logo

SJE Rhombus acquires Best Controls Co. in Clearwater, FL – a manufacturer of custom panels and pump controllers.

2008
csi controls logo

SJE Rhombus acquires CSI Controls in Ashland, Ohio – a manufacturer of custom panels and on-site controls.

Learn More

2010
Floatless Technology
c-level

SJE Rhombus develops new line of innovative products using “floatless” technology.

2012
Dave Thomas Becomes CEO
dave thomas

Dave Thomas is named CEO after Laurie Lewandowski retires.

2013
PRIMEX™ Brand Created
primex logo

SJE Rhombus unifies the Engineered Control Solutions businesses (Best Controls, Co., CSI Controls, Control Works, Inc.) under the new master brand PRIMEX™.

2014
5-Year Limited Warranty

SJE Rhombus expands from a three-year to an industry-leading 5-year limited warranty on most wholesale catalog products.

2015
40th Anniversary
40th anniversary logo

 SJE Rhombus celebrates 40th Anniversary (1975-2015) with a company picnic.

2015
ICS Healy-Ruff™ Acquired
ics healy ruff logo

SJE Rhombus acquires ICS Healy-Ruff™ in Plymouth, MN – a manufacturer and integrator of municipal control systems – and positions them within the PRIMEX engineered brand.

2016
MCC Control Systems Acquired
mcc control systems logo

SJE Rhombus acquires MCC Control Systems in Vacaville, CA – a systems integrator and automation solutions provider for municipal water, wastewater and industrial applications – and positions them within the PRIMEX engineered brand.

2017
CSI Controls Rebranding
csi controls

CSI Controls gets a new logo and rebranding.

2017
SJE Rhombus Rebranding
sje rhombus logo

 SJE Rhombus gets a new logo and rebranding for the first time in nearly 20 years.

2017
Company Name Becomes SJE

Company name becomes SJE, with separate brands for SJE Rhombus, CSI Controls and PRIMEX.

2017
ESOP Company of the Year
esop award 2017

SJE Rhombus is named 2017 ESOP Company of the Year by the National ESOP (Employee Stock Ownership Plan) Association.

2018
new ashland facility 2018

Construction begins on a new facility in Ashland, OH, with more space than the old facility in the same city.

Learn More

2019
dave thomas cutting ribbon

The newly finished Ashland, OH, facility hosts a grand opening celebration.

Learn More

2019
our values logo

SJE announces a new purpose statement and values.

Learn More

2020
President and CEO Dave Thomas addresses Detroit Lakes employee owners

SJE meets the its Vision 2020 goal of reaching a $100 share price by 2020.

Learn More

2021

SJE was acquired by Audax Private Equity, a leading alternative investment manager with offices in Boston, New York and San Fransisco.

Learn More

2021
l w allen and altronex logos

SJE acquires L. W. Allen and Altronex, based in Madison, WI. L. W. Allen is a factory-authorized distributor and Altronex is a custom control system provider.

Website: www.lwallen.com

2021

SJE acquires Ohio Electric Control, based in Ashland, OH. OEC specializes in custom control panels for a variety of industries.

Website: www.ohioelectriccontrol.com

2022
horlick control solutions by sje

SJE acquires Horlick, based in Randolph, MA. Horlick specializes in motor generator sets and control panels.

Website: www.horlick.com

2023
bjorn haldorsen

Bjorn Haldorsen becomes CEO of SJE.

2024
ICON Technologies Acquired

SJE acquires ICON, based in Tampa, FL. ICON specializes in solid state motor control solutions.

Website: www.icon-tech.com

2024
Revere Acquired

SJE acquires Revere, based in Hoover, AL. Revere is a premier turnkey provider of controls and automation solutions performing a full suite of engineering services for water and industrial applications.

Website: www.reverecontrol.com

2025
AMI Acquired

SJE acquires AMI, based in Las Vegas, NV. AMI Global is a leading IIoT technology company providing end-to-end remote connectivity solutions for industrial equipment with a deep expertise in the broader pump application and water wastewater markets.

Website: www.amiglobal.com

2025
LangeTech Acquired

SJE acquires AMI, based in Chesterfield, MO. LangeTech Inc. is a supplier of consulting, programming and engineering services for the Automation Industry. Our specialty is listening to our customers’ needs and developing solutions that solve their business challenges.

Website: www.langetech.com

2026
Anchor Scientific Acquired

SJE acquires Anchor Scientific, a manufacturer and distributor of switches and controllers for the water and wastewater industry. The acquisition expands SJE’s portfolio of liquid level floats and related products, growing its presence within the municipal, commercial, and residential markets.

Website: www.anchorscientific.com

SJE Inc: Industry Leading Control Solutions
Privacy Overview

This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.