Who has been buying OPTiM Corporation stock?

5 distinct investors have filed 4 disclosed large-shareholding filings in OPTiM Corporation (3694), most recently on 2026-02-20. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.

How many insider filings does OPTiM Corporation have?

OPTiM Corporation has 4 buy-side and 12 sell-side disclosures on record, covering ¥4.5B ($29.1M) in total reported value, spanning 2023-06-26 to 2026-02-20.

Where does StockDrifts get OPTiM Corporation insider data?

From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.

Do insider buys in Japanese stocks predict returns?

Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

OPTiM Corporation 3694

Company

株式会社オプティムOPTiM Corporation

Investors

Buys

Total Value

¥4.5B ($29.1M)

Avg Return

-30.57%

Last Filing

2026-02-20

OPTiM Corporation (3694) has 4 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥4.5B ($29.1M) in reported transaction value. The earliest filing StockDrifts holds for OPTiM Corporation is dated 2023-06-26; the most recent is 2026-02-20. All of it is parsed from EDINET large-shareholding (5%+) reports, the official disclosure system operated by the Financial Services Agency (Japan). Across these filings the average return since disclosure is -30.57%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2026-07-23	SELL	unknown	アセットマネジメントOne株式会社	other	348.6K	¥390	-13.3%	¥9M ($55K)
2026-07-23	SELL	unknown	みずほ信託銀行株式会社	other	2.1M	¥390	-13.3%	¥215M ($1.4M)
2026-02-20	SELL	unknown	菅谷俊二 Shunji Sugaya	activist	33.0M	¥458	+5.7%	¥329M ($2.1M)
2025-12-25	BUY	unknown	アセットマネジメントOne株式会社	other	372.7K	¥507	+14.8%	¥161M ($1.0M)
2025-12-25	SELL	unknown	みずほ信託銀行株式会社	other	2.7M	¥507	+14.8%	¥1.2B ($7.5M)
2025-12-23	SELL	Market Buy	アセットマネジメントOne株式会社	other	372.7K	¥503	+14.1%	¥161M ($1.0M)
2025-12-23	BUY	Market Buy	みずほ信託銀行株式会社	other	5.4M	¥503	-14.1%	¥2.3B ($15.1M)
2025-12-19	SELL	unknown	菅谷俊二 Shunji Sugaya	activist	33.7M	¥510	+15.3%	¥62M ($400K)
2025-12-19	BUY	unknown	菅谷俊二 Shunji Sugaya	activist	33.7M	¥510	-15.3%	¥17.2B ($110.9M)
2025-12-03	BUY	negotiated	NTT東日本株式会社 NTT EAST, Inc.	strategic	3.2M	¥503	-14.1%	¥106M ($681K)
2025-12-03	SELL	negotiated	NTT東日本株式会社 NTT EAST, Inc.	strategic	3.2M	¥503	+14.1%	¥106M ($681K)
2025-07-23	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	389.7K	¥517	+16.4%	¥354M ($2.3M)
2025-07-23	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	2.7M	¥517	-16.4%	¥1.4B ($9.0M)
2025-06-20	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	unknown	0	¥551	+21.6%	¥33M ($216K)
2025-06-20	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.1M	¥551	+21.6%	¥298M ($1.9M)
2025-06-20	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	2.7M	¥551	-21.6%	¥1.5B ($9.6M)
2025-05-09	BUY	Market Buy	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	62.0K	¥667	-35.2%	¥41M ($267K)
2025-05-09	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.6M	¥667	-35.2%	¥335M ($2.2M)
2025-05-09	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	2.7M	¥667	-35.2%	¥1.8B ($11.6M)
2025-01-10	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	2.7M	¥680	-36.5%	¥1.8B ($11.8M)
2025-01-10	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.1M	¥680	-36.5%	¥760M ($4.9M)
2024-12-23	BUY	unknown	菅谷俊二 Shunji Sugaya	activist	33.8M	¥700	-38.3%	¥290M ($1.9M)
2024-12-23	SELL	unknown	菅谷俊二 Shunji Sugaya	activist	33.8M	¥700	+38.3%	¥290M ($1.9M)
2024-12-23	BUY	unknown	菅谷俊二 Shunji Sugaya	activist	33.8M	¥700	-38.3%	¥290M ($1.9M)
2024-01-25	SELL	unknown	菅谷俊二 sugaya shunji	activist	34.2M	¥963	+55.1%	¥436M ($2.8M)
2023-06-26	SELL	unknown	菅谷俊二 Shunji Sugaya	activist	34.7M	¥1,021	+57.7%	¥569M ($3.7M)
2023-06-26	SELL	unknown	菅谷俊二 Shunji Sugaya	activist	34.7M	¥1,021	+57.7%	¥569M ($3.7M)
2023-06-26	BUY	unknown	菅谷俊二 Shunji Sugaya	activist	34.7M	¥1,021	-57.7%	¥569M ($3.7M)

Frequently asked questions

Who has been buying OPTiM Corporation stock?: 5 distinct investors have filed 4 disclosed large-shareholding filings in OPTiM Corporation (3694), most recently on 2026-02-20. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.
How many insider filings does OPTiM Corporation have?: OPTiM Corporation has 4 buy-side and 12 sell-side disclosures on record, covering ¥4.5B ($29.1M) in total reported value, spanning 2023-06-26 to 2026-02-20.
Where does StockDrifts get OPTiM Corporation insider data?: From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.
Do insider buys in Japanese stocks predict returns?: Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Source filings

Every trade listed above is disclosed in EDINET large-shareholding (5%+) reports, filed with the Financial Services Agency (Japan). View the original EDINET filings for OPTiM Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.