Who has been buying H.I.S. Co., Ltd. stock?

18 distinct investors have filed 29 disclosed large-shareholding filings in H.I.S. Co., Ltd. (9603), most recently on 2026-05-13. 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 H.I.S. Co., Ltd. have?

H.I.S. Co., Ltd. has 29 buy-side and 23 sell-side disclosures on record, covering ¥40.8B ($263.2M) in total reported value, spanning 2021-03-22 to 2026-05-13.

Where does StockDrifts get H.I.S. 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.

H.I.S. Co., Ltd. 9603

Company

株式会社エイチ・アイ・エスH.I.S. Co., Ltd.

Investors

Buys

Total Value

¥40.8B ($263.2M)

Avg Return

-44.94%

Last Filing

2026-05-13

H.I.S. Co., Ltd. (9603) has 29 disclosed large-shareholding filings and 23 disclosed disposals on record, filed by 18 distinct investors. Together those filings cover ¥40.8B ($263.2M) in reported transaction value. The earliest filing StockDrifts holds for H.I.S. Co., Ltd. is dated 2021-03-22; the most recent is 2026-05-13. 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 -44.94%, 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
2026-05-13	BUY	unknown	澤田まゆみ	strategic	900.8K	¥1,038	+2.8%	¥935M ($6.0M)
2026-05-13	BUY	block_purchase	有限会社秀インター	strategic	4.0M	¥1,038	+2.8%	¥99M ($642K)
2026-05-13	BUY	unknown	澤田秀雄	strategic	18.0M	¥1,038	+2.8%	¥18.6B ($120.3M)
2026-05-13	BUY	unknown	澤田秀太	activist	666.4K	¥1,038	+2.8%	¥692M ($4.5M)
2026-01-21	BUY	unknown	澤田まゆみ	strategic	900.8K	¥1,339	+19.3%	¥974M ($6.3M)
2026-01-21	BUY	unknown	有限会社秀インター	strategic	3.9M	¥1,339	-19.3%	¥4.2B ($27.3M)
2026-01-21	BUY	unknown	澤田秀雄	strategic	18.0M	¥1,339	+19.3%	¥19.4B ($125.2M)
2026-01-21	BUY	Market Buy	澤田まゆみ	strategic	900.8K	¥1,339	+19.3%	¥974M ($6.3M)
2026-01-21	BUY	Market Buy	有限会社秀インター	strategic	3.9M	¥1,339	-19.3%	¥4.2B ($27.3M)
2026-01-21	BUY	Market Buy	澤田秀雄	strategic	18.0M	¥1,339	+19.3%	¥19.4B ($125.2M)
2025-01-08	BUY	unknown	有限会社秀インター Hideinter Co., Ltd.	strategic	3.8M	¥1,388	-22.1%	¥5.2B ($33.6M)
2025-01-08	BUY	unknown	澤田まゆみ Mayumi Sawada	strategic	900.8K	¥1,388	-22.1%	¥1.3B ($8.1M)
2025-01-08	BUY	unknown	有限会社秀インター Hideinter Co., Ltd.	strategic	3.8M	¥1,388	-22.1%	¥5.2B ($33.6M)
2025-01-08	SELL	unknown	澤田秀雄 Hideo Sawada	strategic	18.0M	¥1,388	+22.1%	¥1.1B ($7.4M)
2025-01-08	SELL	unknown	澤田秀雄 Hideo Sawada	strategic	19.0M	¥1,388	+22.1%	¥1.7B ($10.9M)
2025-01-08	BUY	unknown	澤田まゆみ Mayumi Sawada	strategic	900.8K	¥1,388	-22.1%	¥1.3B ($8.1M)
2024-04-24	BUY	negotiated	有限会社秀インター Hideinter Co., Ltd.	strategic	3.8M	¥1,783	-39.4%	¥356M ($2.3M)
2024-04-24	BUY	unknown	澤田秀雄 Hideo Sawada	strategic	20.7M	¥1,783	-39.4%	¥36.9B ($237.9M)
2024-04-24	BUY	unknown	澤田まゆみ Mayumi Sawada	activist	900.8K	¥1,783	-39.4%	¥1.6B ($10.4M)
2024-04-24	BUY	unknown	有限会社秀インター Hideinter Co., Ltd.	strategic	3.8M	¥1,783	-39.4%	¥6.7B ($43.2M)
2024-04-24	SELL	negotiated	澤田まゆみ Mayumi Sawada	activist	900.8K	¥1,783	+39.4%	¥43M ($276K)
2024-04-24	SELL	negotiated	澤田秀雄 Hideo Sawada	activist	20.7M	¥1,783	+39.4%	¥1.5B ($9.4M)
2024-04-04	SELL	negotiated	澤田秀雄 Hideo Sawada	activist	20.7M	¥1,904	+43.2%	¥1.6B ($10.0M)
2024-04-04	SELL	negotiated	澤田秀雄 Hideo Sawada	activist	20.7M	¥1,904	+43.2%	¥1.6B ($10.0M)
2024-04-04	SELL	negotiated	澤田まゆみ Mayumi Sawada	activist	900.8K	¥1,904	+43.2%	¥46M ($294K)
2024-04-04	BUY	negotiated	有限会社秀インター Hideinter Co., Ltd.	strategic	3.8M	¥1,904	-43.2%	¥380M ($2.5M)
2024-04-04	SELL	negotiated	澤田まゆみ Mayumi Sawada	activist	900.8K	¥1,904	+43.2%	¥106M ($687K)
2024-04-04	BUY	negotiated	有限会社秀インター Hideinter Co., Ltd.	strategic	3.8M	¥1,904	-43.2%	¥137M ($883K)
2023-09-25	SELL	Market Buy	ゴールドマン・サックス・アセット・マネジメント・ホンコン・リミテッドLimited) Goldman Sachs Asset Management(Hong Kong	other	68.8K	¥1,809	+40.2%	¥14M ($93K)
2023-09-25	SELL	Market Buy	ゴールドマン・サックス・アセット・マネジメント・インターナショナル Goldman Sachs Asset Management International	other	76.8K	¥1,809	+40.2%	¥14M ($93K)
2023-09-25	SELL	Market Buy	ゴールドマン・サックス・アセット・マネジメント・エル・ピー(Goldman Sachs Asset Management Goldman Sachs Asset Management	other	2.5M	¥1,809	+40.2%	¥159M ($1.0M)
2023-09-25	SELL	Market Buy	ゴールドマン・サックス・アセット・マネジメント株式会社 Goldman Sachs Asset Management Co., Ltd.	other	117.5K	¥1,809	+40.2%	¥101M ($652K)
2023-09-25	BUY	Market Buy	ゴールドマン・サックス・アンド・カンパニー・エルエルシー Goldman Sachs & Co. LLC	other	-12.8K	¥1,809	-40.2%	-
2023-09-25	SELL	Market Buy	ゴールドマン・サックス・インターナショナル Goldman Sachs International	other	582.3K	¥1,809	+40.2%	¥1.3B ($8.3M)
2023-09-25	BUY	Market Buy	ゴールドマン・サックス証券株式会社 Goldman Sachs Japan Co.,Ltd.	other	6.1K	¥1,809	-40.2%	¥1.4B ($9.3M)
2023-08-22	BUY	unknown	ゴールドマン・サックス・アセット・マネジメント・ホンコン・リミテッドLimited) Goldman Sachs Asset Management(Hong Kong	other	83.7K	¥2,000	-46.0%	¥167M ($1.1M)
2023-08-22	BUY	unknown	ゴールドマン・サックス・アセット・マネジメント・インターナショナル Goldman Sachs Asset Management International	other	86.6K	¥2,000	-46.0%	¥173M ($1.1M)
2023-08-22	BUY	unknown	ゴールドマン・サックス・アセット・マネジメント・エル・ピー(Goldman Sachs Asset Management Goldman Sachs Asset Management	other	2.6M	¥2,000	-46.0%	¥5.2B ($33.7M)
2023-08-22	BUY	unknown	ゴールドマン・サックス・アセット・マネジメント株式会社 Goldman Sachs Asset Management Co., Ltd.	other	177.6K	¥2,000	-46.0%	¥355M ($2.3M)
2023-08-22	BUY	unknown	ゴールドマン・サックス・アンド・カンパニー・エルエルシー Goldman Sachs & Co. LLC	other	-12.8K	¥2,000	-46.0%	-
2023-08-22	BUY	unknown	ゴールドマン・サックス・インターナショナル Goldman Sachs International	other	1.3M	¥2,000	-46.0%	¥2.6B ($16.7M)
2023-08-22	BUY	unknown	ゴールドマン・サックス証券株式会社 Goldman Sachs Japan Co.,Ltd.	other	0	¥2,000	-46.0%	-
2023-04-21	BUY	subscription	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	1.4M	¥2,002	-46.0%	¥1.0B ($6.6M)
2023-04-21	SELL	subscription	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	86.0K	¥2,002	+46.0%	¥304M ($2.0M)
2023-04-21	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥2,002	-46.0%	-
2023-04-21	SELL	subscription	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.3M	¥2,002	+46.0%	¥1.4B ($8.9M)
2022-10-07	BUY	subscription	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	242.1K	¥2,161	-50.0%	¥523M ($3.4M)
2022-10-07	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥2,161	-50.0%	-
2022-10-07	BUY	subscription	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥2,161	-50.0%	¥6.4B ($41.3M)
2022-10-07	BUY	subscription	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	892.7K	¥2,161	-50.0%	¥1.9B ($12.4M)

Showing the 50 most recent of 72 filings.

Frequently asked questions

Who has been buying H.I.S. Co., Ltd. stock?: 18 distinct investors have filed 29 disclosed large-shareholding filings in H.I.S. Co., Ltd. (9603), most recently on 2026-05-13. 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 H.I.S. Co., Ltd. have?: H.I.S. Co., Ltd. has 29 buy-side and 23 sell-side disclosures on record, covering ¥40.8B ($263.2M) in total reported value, spanning 2021-03-22 to 2026-05-13.
Where does StockDrifts get H.I.S. 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 H.I.S. Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.