Who has been buying Systena Corporation stock?

10 distinct investors have filed 9 disclosed large-shareholding filings in Systena Corporation (2317), most recently on 2026-04-13. 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 Systena Corporation have?

Systena Corporation has 9 buy-side and 13 sell-side disclosures on record, covering ¥3.3B ($21.3M) in total reported value, spanning 2021-04-21 to 2026-04-13.

Where does StockDrifts get Systena 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.

Systena Corporation 2317

Company

株式会社システナSystena Corporation

Investors

Buys

Total Value

¥3.3B ($21.3M)

Avg Return

-10.56%

Last Filing

2026-04-13

Systena Corporation (2317) has 9 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥3.3B ($21.3M) in reported transaction value. The earliest filing StockDrifts holds for Systena Corporation is dated 2021-04-21; the most recent is 2026-04-13. 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 -10.56%, 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
2026-04-13	BUY	subscription	逸見愛親	activist	17.0M	¥414	+4.3%	¥7.1B ($45.5M)
2026-04-13	BUY	subscription	逸見愛親	activist	17.0M	¥414	+4.3%	¥7.1B ($45.5M)
2026-04-13	SELL	subscription	逸見由美子	strategic	1.7M	¥414	-4.3%	¥35M ($228K)
2026-04-13	BUY	subscription	セバス・アセットマネジメント有限会社	strategic	1.1M	¥414	+4.3%	¥455M ($2.9M)
2026-04-13	BUY	subscription	ファンタジー・ローズ有限会社	strategic	1.1M	¥414	+4.3%	¥456M ($2.9M)
2026-04-13	BUY	subscription	ガヤ・アセットマネージャー有限会社	strategic	2.1M	¥414	+4.3%	¥890M ($5.7M)
2026-04-13	SELL	subscription	逸見由美子	strategic	1.7M	¥414	-4.3%	¥35M ($228K)
2026-04-13	BUY	subscription	SMSホールディングス有限会社	activist	104.2M	¥414	+4.3%	¥43.2B ($278.4M)
2026-04-13	BUY	subscription	ファンタジー・ローズ有限会社	strategic	1.1M	¥414	+4.3%	¥456M ($2.9M)
2026-04-13	BUY	subscription	セバス・アセットマネジメント有限会社	strategic	1.1M	¥414	+4.3%	¥455M ($2.9M)
2026-04-13	BUY	subscription	ガヤ・アセットマネージャー有限会社	strategic	2.1M	¥414	+4.3%	¥890M ($5.7M)
2026-04-13	BUY	subscription	SMSホールディングス有限会社	activist	104.2M	¥414	+4.3%	¥43.2B ($278.4M)
2025-11-07	BUY	Market Buy	ファンタジー・ローズ有限会社 Fantasy Rose Co., Ltd.	strategic	1.1M	¥516	-14.9%	¥66M ($425K)
2025-11-07	SELL	Market Buy	セバス・アセットマネジメント有限会社 Sebas Asset Management Co., Ltd.	strategic	1.1M	¥516	+14.9%	¥44M ($284K)
2025-11-07	SELL	Market Buy	ガヤ・アセットマネージャー有限会社 Gaya Asset Manager Co., Ltd.	strategic	2.1M	¥516	+14.9%	¥132M ($851K)
2025-11-07	BUY	Market Buy	SMSホールディングス有限会社 SMS Holdings Corporation	activist	104.2M	¥516	-14.9%	¥3.3B ($21.1M)
2025-11-07	BUY	Market Buy	逸見由美子 Yumiko Itsumi	strategic	1.8M	¥516	-14.9%	¥88M ($567K)
2023-08-04	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.9M	¥254	-72.8%	¥996M ($6.4M)
2023-08-04	SELL	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	9.3M	¥254	-72.8%	¥195M ($1.3M)
2023-04-06	SELL	Market Buy	ワサッチ・アドバイザーズ・エルピー Wasatch Advisors, LP	passive	18.3M	¥278	-57.9%	¥1.8B ($11.6M)
2023-03-22	SELL	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	22.1M	¥299	-46.8%	¥1.3B ($8.7M)
2023-03-22	BUY	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	22.1M	¥299	+46.8%	¥1.3B ($8.7M)
2023-02-21	SELL	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	12.8M	¥340	-29.1%	¥1.7B ($11.3M)
2023-02-21	BUY	Market Buy	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	10.0M	¥340	+29.1%	¥199M ($1.3M)
2023-01-17	SELL	Market Buy	ワサッチ・アドバイザーズ・エルピー Wasatch Advisors, LP	passive	26.2M	¥386	-13.7%	¥400M ($2.6M)
2023-01-17	BUY	Market Buy	ワサッチ・アドバイザーズ・エルピー Wasatch Advisors, LP	passive	24.8M	¥386	+13.7%	¥940M ($6.1M)
2022-09-30	SELL	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	26.6M	¥403	-8.9%	¥1.8B ($11.8M)
2022-09-30	BUY	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	26.6M	¥403	+8.9%	¥1.8B ($11.8M)
2022-06-27	SELL	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	31.1M	¥414	-6.0%	¥448M ($2.9M)
2022-06-27	BUY	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	31.1M	¥414	+6.0%	¥448M ($2.9M)
2022-06-27	BUY	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	31.1M	¥414	+6.0%	¥448M ($2.9M)
2022-06-27	BUY	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	31.1M	¥414	+6.0%	¥448M ($2.9M)
2022-03-03	BUY	Market Buy	ワサッチ・アドバイザーズ・インク Wasatch Advisors, Inc.	passive	27.2M	¥428	+2.6%	¥2.0B ($12.9M)
2021-09-13	BUY	Market Buy	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	8.1M	¥612.5	-28.3%	¥718M ($4.6M)
2021-06-15	BUY	Market Buy	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	6.9M	¥491.5	-10.7%	¥582M ($3.8M)
2021-06-15	BUY	unknown	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	6.9M	¥491.5	-10.7%	¥582M ($3.8M)
2021-05-07	BUY	acquisition	モンドリアン・インベストメント・パートナーズ・リミテッド(Mondrian Investment Partners Limited) Mondrian Investment Partners Limited	other	5.7M	¥570	-23.0%	¥3.3B ($21.0M)
2021-04-21	SELL	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	4.5M	¥548.5	+20.0%	¥668M ($4.3M)
2021-04-21	BUY	Market Buy	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	2.4M	¥548.5	-20.0%	¥284M ($1.8M)

Frequently asked questions

Who has been buying Systena Corporation stock?: 10 distinct investors have filed 9 disclosed large-shareholding filings in Systena Corporation (2317), most recently on 2026-04-13. 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 Systena Corporation have?: Systena Corporation has 9 buy-side and 13 sell-side disclosures on record, covering ¥3.3B ($21.3M) in total reported value, spanning 2021-04-21 to 2026-04-13.
Where does StockDrifts get Systena 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 Systena Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.