Who has been buying Sanki Service Corporation stock?

12 distinct investors have filed 41 disclosed large-shareholding filings in Sanki Service Corporation (6044), most recently on 2025-10-31. 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 Sanki Service Corporation have?

Sanki Service Corporation has 41 buy-side and 25 sell-side disclosures on record, covering ¥2.2B ($14.3M) in total reported value, spanning 2021-05-06 to 2025-10-31.

Where does StockDrifts get Sanki Service 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.

Sanki Service Corporation 6044

Company

株式会社三機サービスSanki Service Corporation

Investors

Buys

Total Value

¥2.2B ($14.3M)

Avg Return

+58.06%

Last Filing

2025-10-31

Sanki Service Corporation (6044) has 41 disclosed large-shareholding filings and 25 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥2.2B ($14.3M) in reported transaction value. The earliest filing StockDrifts holds for Sanki Service Corporation is dated 2021-05-06; the most recent is 2025-10-31. 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 +58.06%, 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
2025-10-31	BUY	Market Buy	シンメンテホールディングス株式会社 Shin Maint Holdings Co.,Ltd.	other	613.1K	¥2,173	-22.3%	¥147M ($951K)
2025-09-29	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	90.4K	¥1,905	-11.4%	¥172M ($1.1M)
2025-09-29	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	255.8K	¥1,905	-11.4%	¥33M ($210K)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	445.3K	¥1,905	-11.4%	¥848M ($5.5M)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	444.8K	¥1,905	-11.4%	¥847M ($5.5M)
2025-09-04	BUY	Market Buy	シンメンテホールディングス株式会社 Shin Maint Holdings Co.,Ltd.	other	545.3K	¥1,756	-3.9%	¥116M ($746K)
2025-07-24	BUY	Market Buy	シンメンテホールディングス株式会社 Shin Maint Holdings Co.,Ltd.	other	479.3K	¥1,371	+23.1%	¥105M ($675K)
2025-06-05	BUY	unknown	シンメンテホールディングス株式会社 Shin Maint Holdings Co.,Ltd.	other	330.0K	¥1,103	+53.0%	¥364M ($2.3M)
2025-06-05	BUY	Market Buy	シンメンテホールディングス株式会社 Shin Maint Holdings Co.,Ltd.	other	403.2K	¥1,103	+53.0%	¥81M ($520K)
2025-01-09	BUY	unknown	シンメンテホールディングス株式会社 Shin Maint Holdings Co.,Ltd.	other	330.0K	¥996	+69.5%	¥329M ($2.1M)
2023-03-07	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	445.3K	¥927	+82.1%	¥413M ($2.7M)
2023-03-07	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	444.8K	¥927	+82.1%	¥412M ($2.7M)
2023-03-07	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	90.4K	¥927	+82.1%	¥84M ($541K)
2023-03-07	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	238.7K	¥927	+82.1%	¥62M ($398K)
2022-12-08	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	172.7K	¥907	+86.1%	¥21M ($139K)
2022-12-08	BUY	unknown	中島薫子 Kaoruko Nakajima	strategic	75.0K	¥907	+86.1%	¥68M ($439K)
2022-12-08	BUY	unknown	中島義兼 Yoshikane Nakashima	other	429.8K	¥907	+86.1%	¥25M ($162K)
2022-12-08	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	444.8K	¥907	-86.1%	¥43M ($277K)
2022-12-08	BUY	Market Buy	中島義兼 Yoshikane Nakashima	other	430.9K	¥907	+86.1%	¥221M ($1.4M)
2022-12-08	SELL	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	90.4K	¥907	-86.1%	¥9M ($58K)
2022-12-08	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	445.3K	¥907	-86.1%	¥44M ($281K)
2022-12-08	BUY	unknown	中島薫子 Kaoruko Nakajima	strategic	75.0K	¥907	+86.1%	¥8M ($49K)
2022-12-08	BUY	unknown	中島薫子 Kaoruko Nakajima	strategic	75.0K	¥907	+86.1%	¥6M ($39K)
2022-12-08	BUY	unknown	株式会社中島産業 Nakajima Sangyo Co., Ltd.	activist	325.0K	¥907	+86.1%	¥295M ($1.9M)
2022-12-08	BUY	unknown	中島義兼 Yoshikane Nakashima	other	429.8K	¥907	+86.1%	¥390M ($2.5M)
2022-12-08	BUY	unknown	中島義兼 Yoshikane Nakashima	other	990.3K	¥907	+86.1%	¥885M ($5.7M)
2022-12-08	SELL	Market Buy	中島薫子 Kaoruko Nakajima	strategic	225.0K	¥907	-86.1%	¥28M ($181K)
2022-12-08	BUY	unknown	中島薫子 Kaoruko Nakajima	strategic	225.0K	¥907	+86.1%	¥23M ($147K)
2022-12-08	BUY	unknown	株式会社中島産業 Nakajima Sangyo Co., Ltd.	activist	325.0K	¥907	+86.1%	¥10M ($67K)
2022-12-08	BUY	unknown	株式会社中島産業 Nakajima Sangyo Co., Ltd.	activist	325.0K	¥907	+86.1%	¥35M ($229K)
2022-12-08	BUY	unknown	中島諒子 Ryoko Nakashima	strategic	97.5K	¥907	+86.1%	¥15M ($94K)
2022-12-08	BUY	unknown	中島諒子 Ryoko Nakashima	strategic	97.5K	¥907	+86.1%	¥88M ($571K)
2022-12-08	BUY	unknown	中島義兼 Yoshikane Nakashima	other	429.8K	¥907	+86.1%	¥44M ($281K)
2022-12-07	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	71.9K	¥916	-84.3%	¥2M ($14K)
2022-12-07	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	106.5K	¥916	-84.3%	¥4M ($28K)
2022-12-07	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	87.3K	¥916	-84.3%	¥48M ($309K)
2022-10-28	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	90.4K	¥909	+85.7%	¥82M ($530K)
2022-10-28	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	134.1K	¥909	+85.7%	¥55M ($352K)
2022-10-28	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	445.3K	¥909	+85.7%	¥405M ($2.6M)
2022-10-28	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	444.8K	¥909	+85.7%	¥404M ($2.6M)
2022-10-05	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	90.4K	¥890	+89.7%	¥80M ($519K)
2022-10-05	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	74.4K	¥890	+89.7%	¥53M ($345K)
2022-10-05	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	445.3K	¥890	+89.7%	¥396M ($2.6M)
2022-10-05	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	444.8K	¥890	+89.7%	¥396M ($2.6M)
2022-08-08	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	90.4K	¥979	+72.4%	¥89M ($571K)
2022-08-08	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	445.3K	¥979	+72.4%	¥45M ($289K)
2022-08-08	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	444.8K	¥979	+72.4%	¥435M ($2.8M)
2022-08-08	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	14.2K	¥979	+72.4%	¥14M ($90K)
2022-08-04	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	111.2K	¥977	+72.8%	¥3M ($19K)
2022-08-04	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	74.4K	¥977	+72.8%	¥74M ($480K)

Showing the 50 most recent of 110 filings.

Frequently asked questions

Who has been buying Sanki Service Corporation stock?: 12 distinct investors have filed 41 disclosed large-shareholding filings in Sanki Service Corporation (6044), most recently on 2025-10-31. 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 Sanki Service Corporation have?: Sanki Service Corporation has 41 buy-side and 25 sell-side disclosures on record, covering ¥2.2B ($14.3M) in total reported value, spanning 2021-05-06 to 2025-10-31.
Where does StockDrifts get Sanki Service 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 Sanki Service Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.