Who has been buying Japan Securities Finance Co., Ltd. stock?

10 distinct investors have filed 22 disclosed large-shareholding filings in Japan Securities Finance Co., Ltd. (8511), most recently on 2025-10-17. 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 Japan Securities Finance Co., Ltd. have?

Japan Securities Finance Co., Ltd. has 22 buy-side and 14 sell-side disclosures on record, covering ¥9.1B ($59.0M) in total reported value, spanning 2021-03-17 to 2025-10-17.

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.

Japan Securities Finance Co., Ltd. 8511

Company

日本証券金融株式会社Japan Securities Finance Co., Ltd.

Investors

Buys

Total Value

¥9.1B ($59.0M)

Avg Return

+145.94%

Last Filing

2025-10-17

Japan Securities Finance Co., Ltd. (8511) has 22 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥9.1B ($59.0M) in reported transaction value. The earliest filing StockDrifts holds for Japan Securities Finance Co., Ltd. is dated 2021-03-17; the most recent is 2025-10-17. Across these filings the average return since disclosure is +145.94%, 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
2026-08-10	SELL	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	18.5M	¥2,537	+1.2%	¥2.2B ($14.4M)
2025-10-17	SELL	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	20.5M	¥1,808	-38.7%	¥1.4B ($8.8M)
2025-09-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.5M	¥1,877	-	-
2025-09-19	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	1.8M	¥1,877	-33.6%	¥132M ($853K)
2025-09-19	SELL	negotiated	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	1.0M	¥1,877	-33.6%	¥33M ($213K)
2025-03-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.5M	¥1,869	+34.1%	¥2.8B ($18.0M)
2025-03-21	BUY	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	1.9M	¥1,869	+34.1%	¥3.5B ($22.4M)
2025-03-21	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.1M	¥1,869	+34.1%	¥2.0B ($12.8M)
2025-01-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.5M	¥2,006	-	¥3.0B ($19.3M)
2025-01-21	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	1.8M	¥2,006	-25.0%	¥1.0B ($6.5M)
2025-01-21	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.1M	¥2,006	+25.0%	¥88M ($569K)
2025-01-21	SELL	negotiated	日本証券代行株式会社(2025年1月1日付で三井住友信託銀行株式会社へ吸収合併) Japan Securities Agents Co., Ltd. (merged with Sumitomo Mitsui Trust Bank, Ltd. on January 1, 2025)	unknown	0	¥2,006	-25.0%	¥2.7B ($17.3M)
2024-08-09	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	21.2M	¥1,603	+56.4%	¥1.5B ($9.7M)
2024-02-05	SELL	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	3.5M	¥1,580	-58.7%	¥1.5B ($9.7M)
2023-04-27	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	20.3M	¥990	+153.2%	¥1.0B ($6.6M)
2023-01-10	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	2.6M	¥1,102	-127.5%	¥910M ($5.9M)
2023-01-10	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.1M	¥1,102	-127.5%	¥159M ($1.0M)
2023-01-10	BUY	unknown	日本証券代行株式会社 Japan Securities Agent Co., Ltd.	other	1.5M	¥1,102	-	-
2022-08-19	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	3.4M	¥852	-194.3%	¥851M ($5.5M)
2022-08-19	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.2M	¥852	+194.3%	¥106M ($686K)
2022-08-19	BUY	unknown	日本証券代行株式会社 Japan Securities Agent Co., Ltd.	other	1.5M	¥852	-	-
2022-03-22	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	4.8M	¥968	-	-
2022-03-17	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	4.8M	¥931	+169.3%	¥27M ($173K)
2022-03-04	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	4.4M	¥913	-174.6%	¥999M ($6.4M)
2022-03-04	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.1M	¥913	-174.6%	¥35M ($226K)
2022-03-04	BUY	unknown	日本証券代行株式会社 Japan Securities Agent Co., Ltd.	other	1.5M	¥913	+174.6%	¥53M ($339K)
2022-02-15	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	21.0M	¥903	+177.6%	¥919M ($5.9M)
2021-12-16	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	20.0M	¥844	+197.0%	¥875M ($5.6M)
2021-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	3.5M	¥845	-	-
2021-12-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	64.0K	¥845	+196.7%	¥5.3B ($34.1M)
2021-12-07	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	1.1M	¥845	-196.7%	¥57M ($366K)
2021-12-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.1M	¥845	-196.7%	¥227M ($1.5M)
2021-10-12	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	19.0M	¥846	+196.3%	¥845M ($5.4M)
2021-09-07	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	18.0M	¥896	+179.8%	¥860M ($5.5M)
2021-05-21	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	4.8M	¥849	+195.3%	¥4.1B ($26.3M)
2021-05-14	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	17.0M	¥830	+202.1%	¥829M ($5.3M)
2021-04-07	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	16.0M	¥838	+199.2%	¥957M ($6.2M)
2021-04-02	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	14.9M	¥682.345	+267.4%	¥707M ($4.6M)
2021-03-29	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	13.8M	¥681.493	+267.9%	¥1.0B ($6.8M)
2021-03-22	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	3.5M	¥656.284	+282.0%	¥88M ($569K)
2021-03-22	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	459.1K	¥656.284	-	¥301M ($1.9M)
2021-03-22	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	1.1M	¥656.284	+282.0%	¥340M ($2.2M)
2021-03-22	SELL	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.4M	¥656.284	-282.0%	¥668M ($4.3M)
2021-03-17	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	12.3M	¥591.58	+323.8%	¥823M ($5.3M)

Frequently asked questions

Who has been buying Japan Securities Finance Co., Ltd. stock?: 10 distinct investors have filed 22 disclosed large-shareholding filings in Japan Securities Finance Co., Ltd. (8511), most recently on 2025-10-17. 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 Japan Securities Finance Co., Ltd. have?: Japan Securities Finance Co., Ltd. has 22 buy-side and 14 sell-side disclosures on record, covering ¥9.1B ($59.0M) in total reported value, spanning 2021-03-17 to 2025-10-17.
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.