America’s Fastest Transformer Supplier
Maddox Transformer Group is the leading U.S. supplier of new and remanufactured transformers, including padmount, substation, and dry-type units.
Maddox designs, supplies, and warranties padmount, substation, polemount, and dry-type transformers to ANSI, NEMA, DOE, and IEEE standards as applicable.
Maddox also supplies pad-mounted and metal-enclosed switchgear to provide safe switching and overcurrent protection for your electrical systems.
Unlike other OEMs who prioritize the needs of electric utilities, Maddox supports commercial and industrial projects with faster lead times and more responsive support.
We support American infrastructure by supplying transformers to businesses of every size: from family-owned dry cleaners and restaurants to Fortune 100 companies, global data center hyperscalers, and everyone in between.
Maddox has been recognized as one of America’s fastest growing privately-owned companies by the Inc. 5000 list for eight consecutive years.
We deliver transformers in less time, and with less headaches, while still supplying transformers to NEMA, ANSI, DOE, and IEEE standards as applicable.
Transformers available for same-day delivery.
Build-to-spec with short lead times.
Manufacturing capabilities for any design.
Helpful transformer people, not call centers.
The difference between us and other transformer manufacturers is our focus on speed and an easy buying experience.
With seven transformer facilities across America and customers in all 50 states, Maddox offers the scale of a national manufacturer and the service of a local supplier.
Headquarters
2210 NE 118th Street Vancouver, WA 98604
4320 Pleasant Valley Road Greenville, SC 29651
99 Park Industrial Road Fountain Inn, SC 29644
9175 Moffat Industrial Drive Cincinnati, OH 45103
99 Park Industrial RoadWarehouse D Fountain Inn, SC 29644
9175 Moffat Industrial Drive Building CCincinnati, OH 45103
117 Pelham Commerce Way Greenville, SC 29681
814 South Main Street Spokane, WA 83843
2400 Timberloch Place Suite 600 Houston, TX 77380
5590 SC-101 Woodruff, SC 29388
Founded by a team with decades of experience in transformers dating back to the 1980s, Maddox has a strong heritage of supplying new and remanufacturing reliable transformers.
With over 95 years of combined industry experience between them, our leaders understand the challenges facing America’s electrical infrastructure.
Founded in 2015 by a group of transformer industry veterans, and headquartered in Vancouver, WA, Maddox has achieved exponential growth thanks to our amazing team delivering a reliable product.
Camden Spiller founds
Maddox alongside industry
leaders in Greenville, SC
Maddox expands to the
west coast with a facility in
Vancouver, WA
Maddox opens facility in
Greenville, SC to increase 3-
Phase padmount production
Maddox expands
operations to the midwest
with a facility in Cincinnati, OH
Maddox named to the
Inc. 5000 for a sixth
consecutive year
Maddox opens its first location in
Houston, TX, to serve customers
in "the energy capital of the world."
Maddox lays the groundwork
for additional 3-Phase
padmount production with a
10-acre site in Woodruff, SC
We’re building a culture where every employee can thrive, find purpose, and work alongside a close-knit team. The result has been a one-of-a-kind employee experience.
Tired of long lead times and unresponsive customer service? Get your next transformer fast and hassle-free from Maddox's large portfolio of products.
Maddox is committed to serving electrical professionals from every field by sharing up-to-date industry news and high-quality technical information.
New to the industry? Learn everything you need to know about transformers here.
Stay updated on the latest projects.
What are the main products Maddox Transformer sells?
Maddox sells reliable low and medium voltage transformers that include dry-type, padmount, and substation units.
Which industries does Maddox Transformer specialize in serving?
Maddox is focused on serving commercial and industrial customers such as contractors, renewables, data centers, and end users.
Where is Maddox Transformer located?
Maddox is headquartered in Vancouver, WA, with additional facilities throughout the United States in South Carolina, Ohio, Washington, Idaho, Texas and Tennessee.
Is Maddox Transformer currently hiring?
As one of America’s fastest-growing privately owned companies we’re always hiring. Visit our careers page for current openings.
Does Maddox Transformer sell both new and remanufactured transformers?
Yes, Maddox sells both new and remanufactured transformers, including new stock and made-to-order units.
How long has Maddox Transformers been in business?
Maddox was founded in 2015 by a team with experience leading transformer companies since the 1970s.
Is Maddox a good place to work?
According to Glassdoor, 100% of employees would recommend Maddox Transformer as a good place to work.
How do I place an order with Maddox Transformer?
Submit a request for quote form and a transformer expert will contact you within 30 minutes to provide price and lead time.
Are Maddox padmount transformers BABA compliant?
Many Maddox products are made in the USA, but not all. Our goal is to provide the majority of our products domestically, while leveraging global supply as needed. We specify “American Made” on our quotes when applicable. Maddox can also provide padmounts to meet “Build America, Buy America” requirements. Ask for BABA in your quote and learn more about BABA here.
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