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ROHM Co., Ltd.
Native name
Public KK
Traded as TYO: 6963
OSE: 6963
Industry Electronics
Founded Kyoto, Japan (September 17, 1958 (1958-09-17))
Founder Kenichiro Sato
Headquarters 21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585 Japan
Area served
Key people
Satoshi Sawamura, (CEO and President)

$ 3,110 billion (FY 2012)

(¥ 292,411 million) (FY 2012)

$ -9.798 million (FY 2012)

(¥ -921 million) (FY 2012)

$ -558.128 million (FY 2012)

(¥ -52,464 million) (FY 2012)
Total assets

$ 7,436 million (FY 2012)

(¥ 699,014 million) (FY 2012)
Total equity

$ 6,528 million (FY 2012)

(¥ 613,647 million) (FY 2012)
Number of employees
20,203 (as of March 31, 2013)
Website Official website
Footnotes / references

ROHM Semiconductor (ローム株式会社 Rōmu Kabushiki-gaisha) is a Japanese electronic parts manufacturer based in Kyoto, Japan. ROHM was incorporated as Toyo Electronics Industry Corporation by Kenichiro Sato (佐藤 研一郎) on September 17, 1958.

The company was initially known as R.ohm which was derived from R, for resistors, the original product, plus ohm, the unit of measure for resistance.

The name of the company was officially changed to ROHM in 1979 and then changed again to ROHM Semiconductor in January 2009.

When ROHM was established, resistors were its main product. Later, the company began manufacturing semiconductors. IC's and discrete semiconductors now account for about 80% of ROHM's revenue.

As of 2011, ROHM is among the Worldwide Top 20 Semiconductor Sales Leaders.


  • 1954 - Toyo Electronics Industry established
Carbon film resistors developed and marketed
  • 1966 - ROHM Wako Co., Ltd. established
  • 1969 - Began development of ICs
ROHM Apollo Co., Ltd. established (Japan)
  • 1970 - Established U.S. subsidiary company Exar in California
  • 1971 - Started research and development of integrated circuits (ICs) in Silicon Valley
ROHM Electronics GmbH established
Transistor developed and marketed
  • 1979 - Corporate name is changed from R.ohm to ROHM
  • 1984 - First in the world to succeed in the practical industrial use of laser diodes with MBE methodology
  • 1986 - Listed on the First Section of the Osaka Stock Exchange
Memory ICs developed and marketed
  • 1988 - Obtained basic patent of flash memory in the USA
  • 1989 - ROHM-WAKO Eletronics Sdn Bhd (RWEM) established (Malaysia) [2]
Rohm Electronics Philippines, Inc. (REPI) established
  • 1990 - Began sales of LED message boards
  • 1991 - Established ROHM Music Foundation
  • 1994 - Sells out remaining Exar ownership
  • 1996 - ROHM Wako Device Co., Ltd. established (Japan)
ROHM Electronics Korea Corporation established
ROHM Electronics (Philippines) Sales Corporation established
  • 1997 - Started mass production of red laser diodes for DVDs
  • 2002 - Optical Device Research Center opened
  • 2008 - Acquired Oki Electric Industry's semiconductor business.[3]
  • 2009 - Market leader Kionix, an MEMS supplier, becomes a subsidiary of ROHM.[4]
  • 2010 - Acquired MARUZEN ELECTRIC[5]
  • 2011 - Made a 50-year contract with Kyoto City Government for the naming rights of Kyoto Kaikan, naming "Rohm Theatre Kyoto" in July 2013


  1. ^ "Corporate Data". Retrieved March 27, 2014. 
  2. ^ "Annual Report 2013" (PDF). Retrieved March 27, 2014. 
  3. ^ "Rohm to buy Oki Electric's chip business".  
  4. ^ "Rohm Co., Ltd. Acquisition of Kionix, Inc.". I-Micronews. October 13, 2009. Retrieved March 27, 2014. 
  5. ^ "Company History". Retrieved March 27, 2014. 

External links

  • Official website (English)
  • Welcome to ROHM Semiconductor GmbH (Europe)
  • Welcome to ROHM Semiconductor USA, LLC
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