Who has been buying Sun-Wa Technos Corporation stock?

8 distinct investors have filed 8 disclosed large-shareholding filings in Sun-Wa Technos Corporation (8137), most recently on 2026-03-18. 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 Sun-Wa Technos Corporation have?

Sun-Wa Technos Corporation has 8 buy-side and 13 sell-side disclosures on record, covering ¥7.2B ($46.4M) in total reported value, spanning 2021-06-22 to 2026-03-18.

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.

Sun-Wa Technos Corporation 8137

Company

サンワテクノス株式会社Sun-Wa Technos Corporation

Investors

Buys

Total Value

¥7.2B ($46.4M)

Avg Return

+103.28%

Last Filing

2026-03-18

Sun-Wa Technos Corporation (8137) has 8 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥7.2B ($46.4M) in reported transaction value. The earliest filing StockDrifts holds for Sun-Wa Technos Corporation is dated 2021-06-22; the most recent is 2026-03-18. Across these filings the average return since disclosure is +103.28%, 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
2026-03-18	SELL	unknown	光通信株式会社 Hikari Tsushin K.K.	unknown	0	¥3,265	-42.1%	¥3.8B ($24.6M)
2026-03-13	BUY	Market Buy	加賀電子株式会社 KAGA ELECTRONICS CO.,LTD.	passive	1.9M	¥3,170	+46.4%	¥5.9B ($38.0M)
2025-09-29	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥2,677	-73.3%	¥30M ($194K)
2025-09-29	SELL	Market Buy	株式会社エスアイエル SIL Co., Ltd.	unknown	0	¥2,677	-73.3%	¥39M ($249K)
2024-11-06	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	unknown	0	¥2,153	-115.5%	¥55M ($357K)
2024-11-06	SELL	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	13.9K	¥2,153	-115.5%	¥290M ($1.9M)
2024-11-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥2,153	-	-
2024-09-25	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥1,967	-	-
2024-09-25	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	25.6K	¥1,967	-135.9%	¥316M ($2.0M)
2024-09-25	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	149.4K	¥1,967	-	-
2024-08-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥2,001	-	-
2024-08-19	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	186.9K	¥2,001	-131.9%	¥344M ($2.2M)
2024-08-19	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	149.4K	¥2,001	-	-
2024-08-01	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥2,104	-	-
2024-08-01	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	357.5K	¥2,104	-120.5%	¥365M ($2.4M)
2024-08-01	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	149.4K	¥2,104	-	-
2022-08-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥1,413	-	-
2022-08-16	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	530.3K	¥1,413	+228.4%	¥245M ($1.6M)
2022-08-16	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	149.4K	¥1,413	-	-
2022-07-20	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥1,339	-246.5%	¥200M ($1.3M)
2022-07-20	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	358.0K	¥1,339	+246.5%	¥215M ($1.4M)
2022-07-20	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	149.4K	¥1,339	-	¥200M ($1.3M)
2022-01-07	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	122.9K	¥1,474	-214.8%	¥109M ($702K)
2022-01-07	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	394.8K	¥1,474	-214.8%	¥33M ($214K)
2022-01-07	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	174.5K	¥1,474	-214.8%	¥111M ($717K)
2021-12-08	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.3M	¥1,800	-	-
2021-12-08	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	197.0K	¥1,800	+157.8%	¥326M ($2.1M)
2021-11-04	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	16.2K	¥1,591	-	¥26M ($166K)
2021-11-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.3M	¥1,591	+191.6%	¥242M ($1.6M)
2021-10-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.2M	¥1,483	+212.9%	¥276M ($1.8M)
2021-09-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	990.4K	¥1,530	+203.3%	¥280M ($1.8M)
2021-08-23	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	807.6K	¥1,288	+260.3%	¥1.0B ($6.7M)
2021-06-22	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	727.5K	¥1,179	-293.6%	¥216M ($1.4M)

Frequently asked questions

Who has been buying Sun-Wa Technos Corporation stock?: 8 distinct investors have filed 8 disclosed large-shareholding filings in Sun-Wa Technos Corporation (8137), most recently on 2026-03-18. 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 Sun-Wa Technos Corporation have?: Sun-Wa Technos Corporation has 8 buy-side and 13 sell-side disclosures on record, covering ¥7.2B ($46.4M) in total reported value, spanning 2021-06-22 to 2026-03-18.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.