Who has been buying SIIX Corporation stock?

17 distinct investors have filed 46 disclosed large-shareholding filings in SIIX Corporation (7613), most recently on 2026-04-07. 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 SIIX Corporation have?

SIIX Corporation has 46 buy-side and 31 sell-side disclosures on record, covering ¥18.3B ($117.9M) in total reported value, spanning 2021-08-20 to 2026-04-07.

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.

SIIX Corporation 7613

Company

シークス株式会社SIIX Corporation

Investors

Buys

Total Value

¥18.3B ($117.9M)

Avg Return

+9.18%

Last Filing

2026-04-07

SIIX Corporation (7613) has 46 disclosed large-shareholding filings and 31 disclosed disposals on record, filed by 17 distinct investors. Together those filings cover ¥18.3B ($117.9M) in reported transaction value. The earliest filing StockDrifts holds for SIIX Corporation is dated 2021-08-20; the most recent is 2026-04-07. Across these filings the average return since disclosure is +9.18%, 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
2026-04-07	SELL	negotiated	株式会社りそな銀行	strategic	283.2K	¥1,265	-24.7%	¥2.4B ($15.4M)
2026-04-07	BUY	negotiated	りそなアセットマネジメント株式会社	other	550.1K	¥1,265	+24.7%	¥236M ($1.5M)
2026-04-07	SELL	unknown	株式会社三井住友銀行	other	281.7K	¥1,265	-24.7%	¥2.4B ($15.3M)
2026-04-07	SELL	unknown	SMBC日興証券株式会社	other	26.1K	¥1,265	-24.7%	¥64M ($411K)
2026-04-07	BUY	unknown	三井住友DSアセットマネジメント株式会社	passive	1.9M	¥1,265	+24.7%	¥268M ($1.7M)
2026-03-30	SELL	negotiated	株式会社三菱UFJ銀行	strategic	93.9K	¥1,193	-32.3%	¥746M ($4.8M)
2026-03-30	SELL	negotiated	三菱UFJ信託銀行株式会社	passive	978.0K	¥1,193	-32.3%	¥355M ($2.3M)
2026-03-30	BUY	negotiated	三菱UFJアセットマネジメント株式会社	passive	416.3K	¥1,193	+32.3%	¥42M ($272K)
2026-03-30	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社	other	67.2K	¥1,193	-32.3%	¥96M ($621K)
2026-03-23	SELL	unknown	村井史郎(相続人代表葛葉千美)	other	0	¥1,152	-37.0%	¥221M ($1.4M)
2026-03-23	BUY	unknown	有限会社フォーティ・シックス	strategic	2.4M	¥1,152	-	-
2026-01-13	BUY	unknown	株式会社三井住友銀行	other	2.2M	¥1,311	-	-
2026-01-13	SELL	unknown	SMBC日興証券株式会社	other	73.9K	¥1,311	-20.4%	¥1.5B ($10.0M)
2026-01-13	SELL	unknown	三井住友DSアセットマネジメント株式会社	passive	1.7M	¥1,311	-20.4%	¥40M ($256K)
2025-10-29	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	1.3M	¥1,353	+16.6%	¥1.2B ($8.0M)
2025-10-29	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,353	-	-
2025-10-29	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥1,353	+16.6%	¥27M ($176K)
2025-10-22	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,378	-	-
2025-10-22	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥1,378	+14.5%	¥444M ($2.9M)
2025-10-22	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	340.4K	¥1,378	+14.5%	¥326M ($2.1M)
2025-09-05	SELL	unknown	村井史郎(相続人代表葛葉千美) Shiro Murai (Heir Representative Chimi Kuzuha)	strategic	190.0K	¥1,352	-16.7%	¥1.6B ($10.6M)
2025-09-05	SELL	unknown	村井史郎 Shiro Murai	unknown	0	¥1,352	-16.7%	¥1.9B ($12.2M)
2025-09-05	BUY	unknown	有限会社フォーティ・シックス Forty Six Co., Ltd.	strategic	2.4M	¥1,352	+16.7%	¥266M ($1.7M)
2025-09-05	BUY	unknown	有限会社フォーティ・シックス Forty Six Co., Ltd.	strategic	2.4M	¥1,352	+16.7%	¥266M ($1.7M)
2025-08-22	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.4M	¥1,288	+22.5%	¥792M ($5.1M)
2025-08-22	SELL	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	108.2K	¥1,288	-22.5%	¥6M ($42K)
2025-08-22	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,288	-	-
2025-01-22	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	108.8K	¥1,153	-36.9%	¥1.8B ($11.5M)
2025-01-22	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,153	-	-
2025-01-22	BUY	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	778.7K	¥1,153	-	-
2024-12-06	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	1.7M	¥1,144	+37.9%	¥974M ($6.3M)
2024-12-06	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,144	-	-
2024-12-06	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	779.0K	¥1,144	-	-
2024-12-02	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.3M	¥1,133	+39.3%	¥1.4B ($9.3M)
2024-12-02	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	720.0K	¥1,133	+39.3%	¥816M ($5.3M)
2024-12-02	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	382.9K	¥1,133	+39.3%	¥434M ($2.8M)
2024-12-02	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	148.2K	¥1,133	+39.3%	¥168M ($1.1M)
2024-11-22	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	811.8K	¥1,156	+36.5%	¥757M ($4.9M)
2024-11-22	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,156	-	-
2024-11-22	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	779.0K	¥1,156	-36.5%	¥6M ($38K)
2024-06-20	BUY	unknown	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	1.6M	¥1,310	+20.5%	¥2.1B ($13.2M)
2024-06-20	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	452.9K	¥1,310	+20.5%	¥33M ($213K)
2024-02-02	SELL	Market Buy	スパークス・アセット・マネジメント株式会社 SPARX Asset Management Co., Ltd.	passive	1.9M	¥1,581	+0.2%	¥1.2B ($7.6M)
2024-01-22	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	155.2K	¥1,464	-7.8%	¥1.7B ($11.1M)
2024-01-22	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,464	-	-
2024-01-22	SELL	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	784.8K	¥1,464	-7.8%	¥89M ($571K)
2024-01-11	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	1.3M	¥1,490	+5.9%	¥533M ($3.4M)
2024-01-11	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	2.2M	¥1,490	-	-
2024-01-11	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	846.1K	¥1,490	+5.9%	¥263M ($1.7M)
2023-12-07	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	978.6K	¥1,483	+6.4%	¥785M ($5.1M)

Showing the 50 most recent of 99 filings.

Frequently asked questions

Who has been buying SIIX Corporation stock?: 17 distinct investors have filed 46 disclosed large-shareholding filings in SIIX Corporation (7613), most recently on 2026-04-07. 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 SIIX Corporation have?: SIIX Corporation has 46 buy-side and 31 sell-side disclosures on record, covering ¥18.3B ($117.9M) in total reported value, spanning 2021-08-20 to 2026-04-07.
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.