Kazumasa Okubo大久保 和正

Major shareholder of Japan Electronic Materials Corporation

Net worth (est.)
¥4.9B
#757 in Japan
Listed shares · incl. ¥2.2B via asset-management cos.
Executive pay
—
Not disclosed
Dividends (a year)
¥75.0M
#1029
Own name ¥40.9M / via companies ¥34.2M
Total income (est.)
¥75.0M
#2164
Pay + dividends, before tax
Taxes (est.)
¥14.7M
#3216
Income tax ¥11.3M / resident tax ¥3.4M
Other assets (est.)
¥751M
¥5.6B with shares
After-tax income 2024–2026 (incl. ¥576M from share sales), before spending
Inheritance tax (est.)
¥1.2B
#826
If a spouse and two children inherit in statutory shares (change)

Other assets (est.): the sum of each year's after-tax income (pay + dividends in own name − estimated taxes and social insurance) dividends retained by asset-management companies (less about 20% corporate tax), and proceeds from share sales (the drop in shares from the previous year × share price, less 20.315% tax, or about 30% for asset-management companies), for the years we have data. Spending, real estate, donations and savings from earlier years are not reflected.

Asset-management companies: Okubo Kogyoest. (their holdings are included in net worth)

Holdings

CompanyHeld bySharesStakePriceValueDividends
Japan Electronic Materials Corporation
6855 · FY ending Mar 2026
Own name 511,000 3.49% ¥5,210 ¥2.7B ¥40.9M
Japan Electronic Materials Corporation
6855 · FY ending Mar 2026
Okubo Kogyo 427,000 2.91% ¥5,210 ¥2.2B ¥34.2M

By year

YearNet worthPayDividendsTotal incomeTaxes (est.)After tax (est.)Share sales (after tax)
2026¥4.9B—¥75.0M¥75.0M¥14.7M¥26.2M¥95.8M
2025¥1.8B¥35.3M¥68.4M¥104M¥30.4M¥38.8M¥480M
2024¥3.5B¥39.2M¥51.0M¥90.3M¥24.9M¥32.7M—

Grouped by the calendar year of each company's fiscal year-end. Years in which the person was not among the top 10 shareholders of a company exclude that company.

Inheritance tax (estimate)

Estate ¥4.8B = listed shares in own name ¥2.7B + shares held via asset-management companies ¥1.4B (value ¥2.2B less 37% corporate tax on unrealized gains) + other assets (est.) ¥751M

Total inheritance tax paid: ¥1.2B (25.0% of the estate).

HeirInheritsTaxAfter tax
Spouse¥2.4B¥0¥2.4B
Each child¥1.2B¥601M¥602M

Japanese inheritance tax, assuming the estate is split in statutory shares. A spouse pays no tax up to ¥160M or the statutory share, whichever is larger. Family size is not in the securities reports, so you can choose it (with no children, parents or siblings also become heirs, so the real figure differs). Business-succession deferrals, lifetime gifts, donations to foundations, debts and other reliefs are not reflected.

Estimates from annual securities reports (EDINET). The English name is romanized automatically and may differ from the spelling the person uses. Methodology · Corrections and removal requests: contact