Who has been buying Systems Design Co., Ltd. stock?

5 distinct investors have filed 15 disclosed large-shareholding filings in Systems Design Co., Ltd. (3766), most recently on 2025-12-23. 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 Systems Design Co., Ltd. have?

Systems Design Co., Ltd. has 15 buy-side and 0 sell-side disclosures on record, covering ¥941M ($6.1M) in total reported value, spanning 2022-09-16 to 2025-12-23.

Where does StockDrifts get Systems Design 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.

Systems Design Co., Ltd. 3766

Company

システムズ・デザイン株式会社Systems Design Co., Ltd.

Investors

Buys

Total Value

¥941M ($6.1M)

Avg Return

+16.86%

Last Filing

2025-12-23

Systems Design Co., Ltd. (3766) has 15 disclosed large-shareholding filings and 0 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥941M ($6.1M) in reported transaction value. The earliest filing StockDrifts holds for Systems Design Co., Ltd. is dated 2022-09-16; the most recent is 2025-12-23. 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 +16.86%, 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
2026-05-18	BUY	Market Buy	株式会社UH Partners 2	passive	256.4K	¥1,297	+0.1%	¥333M ($2.1M)
2026-05-18	BUY	Market Buy	株式会社EPARK	passive	31.5K	¥1,297	+0.1%	¥41M ($264K)
2026-05-18	BUY	Market Buy	株式会社UH Partners 3	passive	36.4K	¥1,297	+0.1%	¥5M ($35K)
2026-05-18	BUY	Market Buy	光通信株式会社	passive	256.0K	¥1,297	+0.1%	¥332M ($2.1M)
2026-05-18	BUY	Market Buy	株式会社UH5	passive	12.8K	¥1,297	+0.1%	¥17M ($107K)
2025-12-23	BUY	Market Buy	株式会社UH5	passive	12.8K	¥1,292	-7.5%	¥15M ($99K)
2025-12-23	BUY	Market Buy	株式会社UH Partners 3	passive	32.3K	¥1,292	-7.5%	¥39M ($249K)
2025-12-23	BUY	Market Buy	株式会社UH Partners 2	passive	256.4K	¥1,292	+7.5%	¥306M ($2.0M)
2025-12-23	BUY	Market Buy	光通信株式会社	passive	256.0K	¥1,292	+7.5%	¥306M ($2.0M)
2025-09-26	BUY	Market Buy	株式会社UH5 UH5 Co., Ltd.	passive	5.9K	¥1,341	-10.9%	¥8M ($51K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	4.1K	¥1,341	-10.9%	¥563M ($3.6M)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	256.4K	¥1,341	-10.9%	¥9M ($61K)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥1,341	-10.9%	¥343M ($2.2M)
2025-08-22	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	247.6K	¥1,330	-10.2%	¥65M ($417K)
2025-08-07	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	198.7K	¥1,295	-7.7%	¥257M ($1.7M)
2025-06-09	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	249.7K	¥1,136	+5.2%	¥40M ($257K)
2025-06-09	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥1,136	+5.2%	¥291M ($1.9M)
2025-01-09	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	214.6K	¥1,003	+19.1%	¥35M ($226K)
2025-01-09	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥1,003	+19.1%	¥257M ($1.7M)
2024-08-13	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	179.4K	¥924	+29.3%	¥33M ($213K)
2024-08-13	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥924	+29.3%	¥237M ($1.5M)
2024-04-18	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥915	+30.6%	¥234M ($1.5M)
2024-04-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	143.8K	¥915	+30.6%	¥32M ($207K)
2024-01-12	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	108.8K	¥812	+47.2%	¥56M ($363K)
2024-01-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥812	+47.2%	¥208M ($1.3M)
2023-10-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥782	+52.8%	¥200M ($1.3M)
2023-10-16	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	39.4K	¥782	+52.8%	¥28M ($178K)
2023-07-13	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	4.1K	¥813	+47.0%	¥3M ($22K)
2023-07-13	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	256.0K	¥813	+47.0%	¥26M ($171K)
2022-09-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	223.2K	¥638	+87.3%	¥24M ($157K)

Frequently asked questions

Who has been buying Systems Design Co., Ltd. stock?: 5 distinct investors have filed 15 disclosed large-shareholding filings in Systems Design Co., Ltd. (3766), most recently on 2025-12-23. 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 Systems Design Co., Ltd. have?: Systems Design Co., Ltd. has 15 buy-side and 0 sell-side disclosures on record, covering ¥941M ($6.1M) in total reported value, spanning 2022-09-16 to 2025-12-23.
Where does StockDrifts get Systems Design 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 Systems Design Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.