Riken Corundum

5395.TTSE STANDARD

Filed as Riken Corundum Company Limited. (2022-08–2024-08)

Major holders (5%+) · 1

Holder	Stake	Change	Filed
OKAMOTO INDUSTRIES, INC.	97.81%	+8.17pp	2024-10-17

Each holder's own ratio from its most recent large-shareholding report.

Former and minor holders (below 5%) · 1

Simplex Asset Management Co., Ltd. 0.00% 2024-10-07

Ownership history · 3

Filed	Holder	Ratio	Change	Purpose
2024-10-17	OKAMOTO INDUSTRIES, INC.2024-10-17	97.81%	+8.17pp	Material proposals to management (activist); Parent-subsidiary relationship
2024-10-07	Simplex Asset Management Co., Ltd.2024-10-07	0.00%	new	Pure investment; Held for clients (discretionary / trust)
2024-09-30	OKAMOTO INDUSTRIES, INC.2024-09-30	89.64%	new	Going-private / tender offer related

Each holder in 5% reports, joint holders included. Purpose is classified from the filed text.