Who has been buying Sinanen Holdings Co., Ltd. stock?

6 distinct investors have filed 37 disclosed large-shareholding filings in Sinanen Holdings Co., Ltd. (8132), most recently on 2026-05-01. 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 Sinanen Holdings Co., Ltd. have?

Sinanen Holdings Co., Ltd. has 37 buy-side and 1 sell-side disclosures on record, covering ¥12.7B ($81.8M) in total reported value, spanning 2021-05-11 to 2026-05-01.

Where does StockDrifts get Sinanen Holdings Co., Ltd. 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.

Sinanen Holdings Co., Ltd. 8132

Company

シナネンホールディングス株式会社Sinanen Holdings Co., Ltd.

Investors

Buys

Total Value

¥12.7B ($81.8M)

Avg Return

+61.28%

Last Filing

2026-05-01

Sinanen Holdings Co., Ltd. (8132) has 37 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥12.7B ($81.8M) in reported transaction value. The earliest filing StockDrifts holds for Sinanen Holdings Co., Ltd. is dated 2021-05-11; the most recent is 2026-05-01. 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 +61.28%, 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
2026-05-01	BUY	Market Buy	株式会社UH Partners 2	passive	1.1M	¥6,980	+7.3%	¥7.5B ($48.1M)
2026-05-01	BUY	Market Buy	株式会社アイビー	passive	165.1K	¥6,980	+7.3%	¥771M ($5.0M)
2026-05-01	BUY	Market Buy	株式会社エヌオーアイ	passive	963.3K	¥6,980	+7.3%	¥6.7B ($43.4M)
2026-05-01	BUY	Market Buy	株式会社エスアイエル	passive	815.1K	¥6,980	+7.3%	¥5.7B ($36.7M)
2026-05-01	BUY	Market Buy	株式会社UH Partners 3	passive	818.2K	¥6,980	+7.3%	¥5.7B ($36.8M)
2026-05-01	BUY	Market Buy	光通信株式会社	passive	819.3K	¥6,980	+7.3%	¥5.7B ($36.9M)
2025-11-10	BUY	Market Buy	株式会社アイビー IB, Inc.	passive	54.6K	¥6,640	+7.8%	¥363M ($2.3M)
2025-11-10	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	963.3K	¥6,640	+7.8%	¥484M ($3.1M)
2025-11-10	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥6,640	+7.8%	¥411M ($2.7M)
2025-11-10	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥6,640	+7.8%	¥411M ($2.7M)
2025-11-10	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥6,640	+7.8%	¥535M ($3.5M)
2025-11-10	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	819.3K	¥6,640	+7.8%	¥411M ($2.7M)
2025-09-29	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	963.3K	¥6,890	+3.9%	¥593M ($3.8M)
2025-09-29	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥6,890	+3.9%	¥5.6B ($36.2M)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥6,890	+3.9%	¥7.4B ($47.5M)
2025-09-29	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥6,890	+3.9%	¥5.6B ($36.4M)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	819.3K	¥6,890	+3.9%	¥49M ($319K)
2025-06-30	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	811.9K	¥6,250	+14.6%	¥5.1B ($32.7M)
2025-06-30	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥6,250	+14.6%	¥5.1B ($32.9M)
2025-06-30	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥6,250	+14.6%	¥5.1B ($33.0M)
2025-06-30	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥6,250	+14.6%	¥6.7B ($43.1M)
2025-06-30	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	877.0K	¥6,250	+14.6%	¥762M ($4.9M)
2025-05-21	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥6,440	+11.2%	¥6.9B ($44.4M)
2025-05-21	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	811.9K	¥6,440	+11.2%	¥5.2B ($33.7M)
2025-05-21	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	755.6K	¥6,440	+11.2%	¥769M ($5.0M)
2025-05-21	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥6,440	+11.2%	¥5.2B ($33.9M)
2025-05-21	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥6,440	+11.2%	¥5.3B ($34.0M)
2025-02-19	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	636.1K	¥6,270	+14.2%	¥404M ($2.6M)
2025-02-19	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥6,270	+14.2%	¥427M ($2.8M)
2025-02-19	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥6,270	+14.2%	¥434M ($2.8M)
2025-02-19	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥6,270	+14.2%	¥562M ($3.6M)
2025-02-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	811.9K	¥6,270	+14.2%	¥434M ($2.8M)
2025-01-22	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥6,480	+10.5%	¥5.3B ($34.1M)
2025-01-22	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥6,480	+10.5%	¥5.3B ($34.2M)
2025-01-22	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥6,480	+10.5%	¥6.9B ($44.6M)
2025-01-22	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	811.9K	¥6,480	+10.5%	¥5.3B ($33.9M)
2025-01-22	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	624.1K	¥6,480	+10.5%	¥845M ($5.5M)
2024-10-09	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	492.9K	¥6,240	+14.7%	¥822M ($5.3M)
2024-10-09	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥6,240	+14.7%	¥5.1B ($32.8M)
2024-10-09	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	811.9K	¥6,240	+14.7%	¥5.1B ($32.7M)
2024-10-09	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥6,240	+14.7%	¥5.1B ($32.9M)
2024-10-09	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥6,240	+14.7%	¥6.7B ($43.0M)
2024-06-17	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	361.2K	¥4,730	+51.4%	¥623M ($4.0M)
2024-06-17	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥4,730	+51.4%	¥3.9B ($24.9M)
2024-06-17	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥4,730	+51.4%	¥3.9B ($25.0M)
2024-06-17	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.1M	¥4,730	+51.4%	¥5.1B ($32.6M)
2024-06-17	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	811.9K	¥4,730	+51.4%	¥3.8B ($24.8M)
2024-02-09	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	229.8K	¥4,015	+78.3%	¥529M ($3.4M)
2024-02-09	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	815.1K	¥4,015	+78.3%	¥3.3B ($21.1M)
2024-02-09	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	818.2K	¥4,015	+78.3%	¥3.3B ($21.2M)

Showing the 50 most recent of 109 filings.

Frequently asked questions

Who has been buying Sinanen Holdings Co., Ltd. stock?: 6 distinct investors have filed 37 disclosed large-shareholding filings in Sinanen Holdings Co., Ltd. (8132), most recently on 2026-05-01. 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 Sinanen Holdings Co., Ltd. have?: Sinanen Holdings Co., Ltd. has 37 buy-side and 1 sell-side disclosures on record, covering ¥12.7B ($81.8M) in total reported value, spanning 2021-05-11 to 2026-05-01.
Where does StockDrifts get Sinanen Holdings Co., Ltd. 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 Sinanen Holdings Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.