Company history

Seto, in Aichi, has fired pottery since the Edo period — tableware, tiles, insulators. The Kanbe family's partnership, Maruwa Gōshi, was founded there in 1946, and by 1960 it had already turned away from household ceramics toward electronic uses. Incorporating as Maruwa Ceramic Co., Ltd. in April 1973 simply made that specialisation permanent: the new company's stated business was special porcelain for telecommunications equipment — the small ceramic parts inside fixed-line telephones, radio sets and industrial machinery.

The founding split the job in two. Kanbe Yoshiki, the elder brother and an arts graduate, took the presidency and ran the company; his younger brother Kanbe Makoto, a mechanical engineer from Aichi Institute of Technology who had joined after seeing what Kyocera was doing with alumina substrates, took manufacturing and sales as executive vice-president. He would not become president until 1992 — but the product decisions of the first two decades were his.

They were forced ones. Ceramics for fixed resistors, the business Maruwa started in, went nowhere: it sat fourth or fifth among seven rivals and could not grow on volume. Then a customer suggested substrates for chip resistors, and Maruwa put its effort into the unglamorous problem of scoring a substrate in a grid and breaking it evenly, at scale. That capability made its name — “MARUWA of chips” — and pulled orders from the majors. By the year to March 1995, circuit-use ceramics were 58.8% of sales against 15.0% for fixed resistors. The trade the company would run for the next fifty years was set here: don't chase rivals on scale, earn on a part ground precisely to what a customer needs.

In December 1989, sixteen years after incorporation, Maruwa put its first plant abroad — Maruwa (Malaysia) Sdn. Bhd. The late-1980s yen was pushing Japanese manufacturing into Southeast Asia, and Maruwa moved early for a company of its size. A Korean sales subsidiary followed in 1993 and a German one in 1994. For a regional mid-cap rooted in a pottery town, holding both Asian production and European distribution within twenty years was unusually fast.

The listing came next. In August 1995 the company registered its shares over-the-counter with the Japan Securities Dealers Association — its first appearance in the capital markets, twenty-two years in. Kanbe Makoto named the purpose plainly: money to enlarge the Malaysian plant and extend the overseas production network. He added a second reason — employees had held shares since early on and the shareholding association had spread, so going public was also a way of paying back the work already done. The stated ambition was not to lead Japan but to make products that could rank first or second in the world. In 1997 the head office left Seto for Owariasahi, a move away from the geography of the kiln.

Then, in three years, everything else was re-set. December 1998: listing on the second sections of the Tokyo and Nagoya exchanges, and, in the same month, Maruwa Europe Ltd. in Britain; February 1999: Maruwa America Corp. August 1999: the company dropped the Japanese-flavoured “Maruwa Ceramic” and became simply MARUWA — a ceramics specialist redefining itself as an electronic-components maker for customers, investors and recruits who had never heard of Seto. March 2000: promotion to the first sections in Tokyo and Nagoya, four years and seven months after the OTC registration; London and Singapore followed that December.

A Shanghai trading arm in 2003 completed the network — six countries in thirty years. Then MARUWA stepped outside its trade for the first time. MARUWA SHOMEI, set up in 2005, went into high-brightness LED lighting; the adjacency was real enough, since LEDs are semiconductors and their heat-dissipating substrates are ceramic. In December 2012 the company bought all of Yamagiwa, an old Tokyo lighting wholesaler, for $8.8M (¥700m) from the state turnaround body. Neither ever grew into a second pillar: lighting shrank to about a tenth of sales, and Yamagiwa later left the consolidated group in a restructuring.

The core business, meanwhile, showed what it was made of. The 2008 collapse hit an export-heavy components maker directly: sales for the year to March 2009 fell 19% to $161.6M (¥17bn), and MARUWA posted the first ordinary loss in its thirty-five years, ¥130m, alongside a ¥770m net loss. Kanbe Makoto, writing in the 日刊工業新聞 that November, likened the company to a flower standing up to the wind. Recovery took two years — ¥1.38bn ordinary profit in the year to March 2010, ¥3.09bn the year after. Ceramic components move with the world's capital-spending cycle; they fall hard and come back fast.

From there the line bends upward. Consolidated sales ran from ¥21.3bn in the year to March 2012 to ¥38.5bn by March 2017, while operating margin went from 7.3% to 23.8% — MARUWA had put capacity in place ahead of 5G standard-setting, semiconductor equipment investment and vehicle electrification rather than after them. Kanbe Makoto framed this as “material technology multiplied by element technology”: develop the material in-house, then layer circuit design, evaluation, mounting and simulation on top. In January 2021 he announced his own succession — chairman from April 2022, with his eldest son Kanbe Toshiro, then 44 and a 2001 joiner risen through the company, as president.

Three structural demands landed in the same few years — substrates for 5G, high-purity parts for semiconductor equipment, and power-semiconductor packages for electric vehicles — and a company forty-nine years old entered a growth phase in its original business. Sales for the year to March 2022 rose 31.1% to ¥54.3bn and ordinary profit 85.7% to ¥19.1bn. Records followed for four straight years, to $473.9M (¥72bn) in sales and ¥27.0bn ordinary profit in the year to March 2025, with operating margin parked in the mid-thirties and reaching 37.5%.

Kanbe Toshiro took the presidency in April 2022 at 45, his father staying on as representative chairman so that father and son share representative authority — founder-family governance, made explicit. Within three years a fourth demand appeared: high-heat-dissipation substrates for generative-AI servers. The FY2024 sales mix ran information and communications 36.6%, automotive 21.9%, semiconductors 15.0%, industrial equipment 13.9%, lighting 10.2% — the last of these the shrinking remnant of the 2005 diversification.

What funds all of it is a balance sheet with almost nothing on the right-hand side. At March 2025 total assets were ¥142.3bn against ¥127.9bn of equity — an 89.9% equity ratio, with interest-bearing debt run down to essentially zero and ¥71.6bn of cash, more than half the balance sheet. Capital spending has held near ¥10bn a year, the next major item being a new quartz-glass building at the Miharu plant in Fukushima, due March 2026. The founding family's holding company, Kanbe Art, owns 29.5%; with Kanbe Makoto's personal stake the family sits near a third, alongside trust banks and foreign institutions. The periphery is being folded up and the resources moved to quartz glass, one step from the core — the same selection the company has made at every turn.