Who has been buying SPK Corporation stock?

4 distinct investors have filed 15 disclosed large-shareholding filings in SPK Corporation (7466), most recently on 2025-09-26. 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 SPK Corporation have?

SPK Corporation has 15 buy-side and 2 sell-side disclosures on record, covering ¥1.0B ($6.5M) in total reported value, spanning 2021-04-12 to 2025-09-26.

Where does StockDrifts get SPK 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.

SPK Corporation 7466

Company

SPK株式会社SPK Corporation

Investors

Buys

Total Value

¥1.0B ($6.5M)

Avg Return

+53.35%

Last Filing

2025-09-26

SPK Corporation (7466) has 15 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.0B ($6.5M) in reported transaction value. The earliest filing StockDrifts holds for SPK Corporation is dated 2021-04-12; the most recent is 2025-09-26. 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 +53.35%, 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
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	454.7K	¥1,196.5	+10.8%	¥59M ($379K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	750.5K	¥1,196.5	+10.8%	¥898M ($5.8M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥1,196.5	+10.8%	¥905M ($5.8M)
2025-08-06	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	405.9K	¥1,197.5	+10.7%	¥125M ($808K)
2025-08-06	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	750.5K	¥1,197.5	+10.7%	¥899M ($5.8M)
2025-08-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥1,197.5	+10.7%	¥906M ($5.8M)
2025-04-15	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	300.8K	¥1,011.5	+31.1%	¥108M ($696K)
2025-04-15	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	750.5K	¥1,011.5	+31.1%	¥759M ($4.9M)
2025-04-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥1,011.5	+31.1%	¥765M ($4.9M)
2025-02-18	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	194.3K	¥1,061	+25.0%	¥111M ($716K)
2025-02-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	750.5K	¥1,061	+25.0%	¥796M ($5.1M)
2025-02-18	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥1,061	+25.0%	¥803M ($5.2M)
2024-12-04	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	89.6K	¥1,000.5	+32.5%	¥90M ($578K)
2024-12-04	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	750.5K	¥1,000.5	+32.5%	¥16M ($101K)
2024-12-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥1,000.5	+32.5%	¥757M ($4.9M)
2024-10-03	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥980.5	+35.2%	¥742M ($4.8M)
2024-10-03	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	734.8K	¥980.5	+35.2%	¥104M ($668K)
2024-08-14	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	629.0K	¥1,063	+24.7%	¥118M ($760K)
2024-08-14	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥1,063	+24.7%	¥804M ($5.2M)
2024-05-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	518.0K	¥1,018.5	+30.2%	¥108M ($694K)
2024-05-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥1,018.5	+30.2%	¥770M ($5.0M)
2023-11-30	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥914.5	+45.0%	¥692M ($4.5M)
2023-11-30	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	413.4K	¥914.5	+45.0%	¥96M ($617K)
2023-09-07	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	398.8K	¥1,029.5	-28.8%	¥240M ($1.5M)
2023-07-24	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	631.9K	¥911.5	-45.5%	¥135M ($873K)
2022-11-22	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	308.2K	¥704	+88.3%	¥75M ($484K)
2022-11-22	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	756.5K	¥704	+88.3%	¥736K ($5K)
2022-10-05	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	201.7K	¥698.5	+89.8%	¥74M ($481K)
2022-10-05	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	755.8K	¥698.5	+89.8%	¥528M ($3.4M)
2022-07-28	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	94.7K	¥710	+86.8%	¥67M ($434K)
2022-07-28	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	755.8K	¥710	+86.8%	¥13M ($86K)
2022-05-17	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	736.7K	¥662	+100.3%	¥70M ($451K)
2021-04-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	631.4K	¥658.5	+101.4%	¥72M ($462K)

Frequently asked questions

Who has been buying SPK Corporation stock?: 4 distinct investors have filed 15 disclosed large-shareholding filings in SPK Corporation (7466), most recently on 2025-09-26. 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 SPK Corporation have?: SPK Corporation has 15 buy-side and 2 sell-side disclosures on record, covering ¥1.0B ($6.5M) in total reported value, spanning 2021-04-12 to 2025-09-26.
Where does StockDrifts get SPK 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 SPK Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.