Maddox Industrial Transformer has been named to the Inc. 5000 for the eighth consecutive year, extending its record as one of America’s fastest-growing private companies.

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Maddox Industrial Transformer Named to Inc. 5000 for Eighth Consecutive Year

Maddox Industrial Transformer Named to Inc. 5000 for Eighth Consecutive Year

Maddox ranked No. 1,367 nationally on the 2026 list. The company also earned top honors in industry and regional categories, landing at No. 28 in the industry Energy and Utilities rankings. Regionally, Maddox ranked No. 14 among fastest-growing companies in the Portland-Vancouver-Hillsboro, Oregon–Washington metro area and No. 29 in the state of Washington.

“Eight consecutive years on the Inc. 5000 is a milestone we don’t take for granted,” said Camden Spiller, CEO of Maddox Industrial Transformer. “It’s a direct reflection of the work our team puts in every single day, and the confidence our customers and industry partners place in us. As we grow, our focus remains the same: make it fast and easy for customers to get the transformers they need.”

Transformers that Power American Industry

Maddox supplies new and remanufactured transformers for commercial and industrial projects across North America. Its product offerings include padmount transformers, substation transformers, dry-type transformers and polemount transformers.

The company has supplied transformers for some of the nation’s largest data center and renewable energy projects. You can also find their transformers powering the lumber mills, manufacturing plants, and heavy industrial infrastructure that drives American industry.

“America’s electric grid needs transformers now more than ever,” said Mac Spiller, Chief Commercial Officer of Maddox. “Aging transformers across the grid need replacing, and new manufacturing facilities and infrastructure projects are adding to that demand. Our team has worked hard to grow alongside this demand without losing focus on our customers and their needs. Their commitment is what makes it possible for Maddox to earn a place on the Inc. 5000 list for another year.”

The NREL reported that 55% of in-service U.S. distribution transformers are already more than 33 years old and will need to be replaced soon. Combined with rising demand from reshored manufacturing facilities, electric vehicle charging infrastructure and renewable energy projects, required transformer capacity could increase by as much as 260% by 2050 compared with 2021 levels.

From a Garage Startup to a Nationwide Transformer Supplier

Maddox was founded by brothers Camden and Mac Spiller in 2015, shipping their first transformer from Camden’s garage in Vancouver, Washington. Later that year, they opened up their first facility near Greenville, South Carolina.

The company expanded its West Coast operations in 2018 with an office and production facility in Battle Ground, Washington. One year later, Maddox was recognized for the first time on the Inc. 5000 list at No. 283 also earning a place on the prestigious Inc. 500 list.

In 2020, Maddox expanded their South Carolina footprint to an additional office and production facility in Greer. The next year, they opened up a sales and customer service office in Idaho, followed by an Ohio production facility and office in 2023.

In 2025 Maddox opened their first Texas location in Houston. This year, Maddox expanded further with additional facilities and offices in Tennessee, Ohio, Washington state, and South Carolina.

Maddox Past Rankings on the Inc. 5000 List:

  1. No. 283 (2019)

  2. No. 1129 (2020)

  3. No. 1428 (2021)

  4. No. 1955 (2022)

  5. No. 1166 (2023)

  6. No. 556 (2024)

  7. No. 979 (2025)

  8. No. 1367 (2026)

About the Inc. 5000 List

This year’s Inc. 5000 recognizes a new class of companies redefining what growth looks like. From AI and advanced manufacturing to healthcare, consumer products, and professional services, these businesses are expanding their impact, creating jobs and proving that entrepreneurial ambition continues to fuel the U.S. economy. For the full Inc. 5000 list, honoree company profiles, and a searchable database by industry and location, please visit: www.inc.com/inc5000.

About Maddox Industrial Transformer

Maddox Industrial Transformer is a leading provider of new and remanufactured transformers for commercial and industrial projects across North America. With an extensive inventory, strategically located facilities and experienced transformer specialists, Maddox makes it fast and easy for customers to source the equipment they need.

For more information, visit www.maddox.com.

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