About SxS Partners
Fifty years in Japan. Still accelerating.
From an electronics business founded in Kanagawa in 1973 to a market development partner for international companies today.
Our mission
Simple solutions that make market development possible.
Japan is one of the world's largest technology markets — and one of the hardest to build momentum in. Many companies, from start-ups to large enterprises, struggle to establish a successful presence here.
SxS Partners exists to change that. Our experienced people find the line through the corners: the challenges, the culture, and the structure it takes to win in this market.
Charles Stewart brings decades of experience working between Japan and international technology businesses, with a focus on partner development, commercial leadership and practical execution. Explore our experience →
How ECO-INTER K.K. became SxS Partners. Read the story →
What we deliver
- A bilingual team, fluent in Western and Japanese business culture
- Proactive management, communication and negotiation
- Accurate work with regular, transparent reporting
- A network of proven, trusted service providers
- Experience with leading market channel partners
- Flexibility, cost-effectiveness and control
How delivery works
Direct expertise. Specialist delivery. One agreed plan.
Some work is led and delivered directly by SxS. Other services are delivered through designated specialist providers, or through a combination of both. We agree the scope, responsibilities, communication and reporting before the work begins.
- SxS-led
Strategy, partner and commercial development, leadership and coaching, led by SxS.
- Specialist provider
Specialist work such as administration, technical localization and technical support, delivered by designated providers.
- SxS + specialist provider
Work that combines SxS involvement with specialist delivery, agreed for each engagement.
Since 1973
Our history.
- 1973
ECO-INTER K.K. is founded
A small-business founder and inventor establishes ECO-INTER K.K. in Kanagawa, offering media production, equipment and electronic testing services across Japan and Southeast Asia.
- 1985
Back to the first company
The founder returns to lead his first company, which grows into one of the region's largest industrial electrical installation and technology product sales businesses.
- 2018
A new driver
Charles Stewart takes over ECO-INTER K.K., beginning the company's next stage of development.
- 2019
Services first
The company becomes a services business, focused on market development for international companies in Japan.
- 2023
Fifty years: SxS Partners
In 2023, ECO-INTER K.K. marks its 50th anniversary and becomes SxS Partners K.K.
- Now
Market development & fractional leadership
Market development services and fractional leadership for companies building their business in Japan — with a network that reaches across the Asia-Pacific.
Your next step
Ready to get started in Japan?
Tell us about your product and where you are today.
Start a conversation