Who has been buying Otec Corporation stock?

7 distinct investors have filed 7 disclosed large-shareholding filings in Otec Corporation (1736), most recently on 2025-10-03. 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 Otec Corporation have?

Otec Corporation has 7 buy-side and 2 sell-side disclosures on record, covering ¥3.3B ($21.1M) in total reported value, spanning 2021-04-05 to 2025-10-03.

Where does StockDrifts get Otec 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.

Otec Corporation 1736

Company

株式会社オーテックOtec Corporation

Investors

Buys

Total Value

¥3.3B ($21.1M)

Avg Return

+112.23%

Last Filing

2025-10-03

Otec Corporation (1736) has 7 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥3.3B ($21.1M) in reported transaction value. The earliest filing StockDrifts holds for Otec Corporation is dated 2021-04-05; the most recent is 2025-10-03. 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 +112.23%, 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
2025-10-03	BUY	unknown	日本継手株式会社 nippon pipe fitting corp	strategic	3.1M	¥1,749	+37.0%	¥5.5B ($35.4M)
2025-10-03	BUY	unknown	日本継手株式会社 Nippon Pipe Fitting Corp.	strategic	1.0M	¥1,749	+37.0%	¥1.8B ($11.8M)
2025-10-03	BUY	unknown	日本鋼管継手株式会社 Nippon Kokan Pipe Fitting Mfg. Co. Ltd.	strategic	1.0M	¥1,749	+37.0%	¥1.8B ($11.8M)
2025-10-01	BUY	unknown	日本鋼管継手株式会社 Nippon Kokan Pipe Fitting Mfg. Co. Ltd.	strategic	1.0M	¥1,785	+34.3%	¥1.9B ($12.0M)
2025-09-26	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	139.5K	¥1,802	+33.0%	¥251M ($1.6M)
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	587.1K	¥1,802	+33.0%	¥18M ($119K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.2M	¥1,802	+33.0%	¥2.1B ($13.6M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥1,802	+33.0%	¥22M ($139K)
2025-07-22	BUY	unknown	オーテック共栄会理事長小川義隆 Ogawa Yoshitaka	strategic	865.1K	¥1,428	+67.9%	¥1.2B ($8.0M)
2023-06-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	0	¥798.67	-200.1%	¥436M ($2.8M)
2023-06-16	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	46.5K	¥789	+203.8%	¥37M ($237K)
2023-06-16	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	192.0K	¥789	+203.8%	¥151M ($977K)
2023-06-16	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	390.5K	¥789	+203.8%	¥450K ($3K)
2023-06-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	395.0K	¥789	+203.8%	¥312M ($2.0M)
2023-06-15	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	46.5K	¥773.33	+210.0%	¥36M ($232K)
2023-06-15	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	389.9K	¥773.33	+210.0%	¥128M ($825K)
2023-06-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	395.0K	¥773.33	+210.0%	¥305M ($2.0M)
2023-06-14	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	46.5K	¥766.67	+212.7%	¥36M ($230K)
2023-06-14	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	224.6K	¥766.67	+212.7%	¥172M ($1.1M)
2023-06-14	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	395.0K	¥766.67	-212.7%	¥36M ($231K)
2021-04-05	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	441.5K	¥789.33	+203.7%	¥11M ($70K)

Frequently asked questions

Who has been buying Otec Corporation stock?: 7 distinct investors have filed 7 disclosed large-shareholding filings in Otec Corporation (1736), most recently on 2025-10-03. 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 Otec Corporation have?: Otec Corporation has 7 buy-side and 2 sell-side disclosures on record, covering ¥3.3B ($21.1M) in total reported value, spanning 2021-04-05 to 2025-10-03.
Where does StockDrifts get Otec 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 Otec Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.