Bloomberg Billionaires Index

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# 420 Shigenobu Nagamori $5.86B

Random fact: First sale was to 3M for smaller motors in tape recorders.


Nagamori is the founder and chairman of Nidec, the world’s biggest maker of the motors found in hard disk drives. The Kyoto, Japan-based company is publicly traded and had revenue of 1.6 trillion yen ($15.3 billion) for the year ended March 2021. Since its founding in 1973, Nidec has purchased more than 50 companies.

As of :
Last change -$5.67M ( -0.1%)
YTD change -$3.17B ( -35.1%)
Biggest asset 6594 JP Equity
Country / Region Japan
Age 77
Industry Industrial
View net worth over:   Max 1 year 1 quarter 1 month 1 week

Relative Value

Shigenobu Nagamori's net worth of $5.86B can buy ...

troy ounces of gold
barrels of crude oil

... and is equivalent to ...

of the GDP of the United States
of the total wealth of the 500 richest people in the world
of the top 100 U.S. college endowments
of the top 200 U.S. executives’ total awarded compensation
of U.S. existing home sales
times the median U.S. household income

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Net Worth Summary

Private asset
Public asset
Misc. liabilities
Confidence rating:

The majority of Nagamori's fortune is derived from a 12% stake in Nidec, a maker of computer components and appliances. Nidec is the world's largest maker of hard disk drive motors, according to its website. 

He owns his 12% stake directly and through a personal asset firm, SN Kosan, according to its 2021 third-quarter report. About 6% of his shares are assumed to have been pledged as collateral and are removed from the net worth analysis.

The value of his cash investments is based on an analysis of dividends, insider transactions, taxes and market performance.

Shiro Ikushimi, a spokesman at Nidec, declined to comment on the net worth calculation.


Birthdate: 8/28/1944
Family: Married, 2 children

Shigenobu Nagamori was born into a farming family in Kyoto in 1944. The youngest of six siblings, he opened his own tutoring school to cover the cost of attending high school to study in the electrical department.

After studying electrical engineering at university, Nagamori worked for two engineering companies before establishing Nidec in 1973. Starting with just three employees, he built small motors in a prefabricated shed next to his mother's farmhouse. Failing to land any orders from Japanese companies, Nagamori traveled to the U.S. and signed a contract with 3M to make motors for a tape recorder. That sale proved to be the breakthrough that led to more orders from the U.S. and later Japan.

Nidec's precision motors are now used in everything from refrigerators to cars. It employs more than 96,000 people globally.

Nagamori says he'll continue working until 2030, his target for increasing annual sales to 10 trillion yen. When it does come time to find a successor, he plans to use the same metric his company uses for company promotions: who makes the most money for Nidec.

  • 1944 Nagamori is born in Kyoto, Japan.
  • 1967 Graduates from the predecessor of Polytechnic University near Tokyo.
  • 1973 Establishes Nidec with three employees.
  • 1988 Nidec begins trading on the Osaka Stock Exchange.
  • 1992 Expands operations to China.
  • 1998 Nidec debuts on the Tokyo Stock Exchange.
  • 2001 Begins trading on the New York Stock Exchange.
  • 2016 Delists stocks from the New York Stock Exchange.