Who has been buying Otsuka Corporation stock?

18 distinct investors have filed 20 disclosed large-shareholding filings in Otsuka Corporation (4768), most recently on 2025-07-18. 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 Otsuka Corporation have?

Otsuka Corporation has 20 buy-side and 5 sell-side disclosures on record, covering ¥40.8B ($263.1M) in total reported value, spanning 2022-04-21 to 2025-07-18.

Where does StockDrifts get Otsuka 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.

Otsuka Corporation 4768

Company

株式会社大塚商会Otsuka Corporation

Investors

Buys

Total Value

¥40.8B ($263.1M)

Avg Return

+9.93%

Last Filing

2025-07-18

Otsuka Corporation (4768) has 20 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 18 distinct investors. Together those filings cover ¥40.8B ($263.1M) in reported transaction value. The earliest filing StockDrifts holds for Otsuka Corporation is dated 2022-04-21; the most recent is 2025-07-18. 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 +9.93%, 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
2026-08-05	SELL	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ. BlackRock Institutional Trust Company, N.A.	passive	3.9M	¥3,304	-7.0%	¥879M ($5.7M)
2026-08-05	BUY	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	921.7K	¥3,304	+7.0%	¥3.0B ($19.6M)
2026-08-05	BUY	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	1.8M	¥3,304	+7.0%	¥6.0B ($38.4M)
2026-08-05	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	6.8M	¥3,304	+7.0%	¥6.8B ($43.7M)
2026-08-05	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	3.4M	¥3,304	+7.0%	¥2.5B ($16.2M)
2026-08-05	BUY	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	389.1K	¥3,304	+7.0%	¥1.3B ($8.3M)
2026-08-05	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	498.5K	¥3,304	+7.0%	¥1.6B ($10.6M)
2026-08-05	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	753.9K	¥3,304	-7.0%	¥1.1B ($7.3M)
2026-08-05	SELL	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク BlackRock Financial Management, Inc.	passive	463.4K	¥3,304	-7.0%	¥1.6B ($10.5M)
2026-08-05	SELL	Market Buy	ブラックロック・アドバイザーズ・エルエルシー BlackRock Advisers, LLC	passive	187.7K	¥3,304	-7.0%	¥1.0B ($6.5M)
2026-08-05	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	4.3M	¥3,304	-7.0%	¥1.3B ($8.1M)
2026-06-19	BUY	negotiated	大塚装備株式会社	activist	127.2M	¥2,766.5	+9.0%	¥351.9B ($2.3B)
2026-06-19	BUY	negotiated	大塚裕司	activist	9.4M	¥2,766.5	+9.0%	¥25.9B ($167.1M)
2025-07-18	SELL	Market Buy	ジェー・ピー・モルガン・マンサール・マネジメント・リミテッド J.P. Morgan Mansart Management Limited	other	800.0K	¥2,863	-6.5%	¥2.1B ($13.3M)
2025-07-18	BUY	Market Buy	ジェー・ピー・モルガン・プライム・インク J.P. Morgan Prime Inc.	other	0	¥2,863	+6.5%	-
2025-07-18	BUY	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	1.3M	¥2,863	+6.5%	¥435M ($2.8M)
2025-07-18	BUY	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	4.3M	¥2,863	+6.5%	¥11.4B ($73.7M)
2025-07-18	SELL	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	12.2K	¥2,863	-6.5%	¥349M ($2.3M)
2025-07-18	BUY	Market Buy	JPモルガン・アセット・マネジメント(アジア・パシフィック)リミテッドLimited) JPMorgan Asset Management (Asia Pacific	other	494.9K	¥2,863	+6.5%	¥1.4B ($9.1M)
2025-07-18	SELL	Market Buy	ジェー・ピー・モルガン・インベストメント・マネージメント・インク J.P. Morgan Investment Management Inc.	passive	1.7M	¥2,863	-6.5%	¥979M ($6.3M)
2025-07-18	SELL	Market Buy	JPモルガン・アセット・マネジメント株式会社 JPMorgan Asset Management (Japan) Limited	passive	1.6M	¥2,863	-6.5%	¥97.9B ($631.7M)
2025-07-03	BUY	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	1.2M	¥2,929	+4.1%	¥3.5B ($22.3M)
2025-07-03	BUY	Market Buy	ジェー・ピー・モルガン・マンサール・マネジメント・リミテッド J.P. Morgan Mansart Management Limited	other	1.5M	¥2,929	+4.1%	¥4.4B ($28.5M)
2025-07-03	BUY	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	317.2K	¥2,929	+4.1%	¥929M ($6.0M)
2025-07-03	BUY	Market Buy	ジェー・ピー・モルガン・インベストメント・マネージメント・インク J.P. Morgan Investment Management Inc.	passive	2.0M	¥2,929	+4.1%	¥5.9B ($38.0M)
2025-07-03	BUY	Market Buy	JPモルガン・アセット・マネジメント株式会社 JPMorgan Asset Management (Japan) Limited	passive	1.9M	¥2,929	+4.1%	¥5.7B ($36.7M)
2025-07-03	BUY	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	12.2M	¥2,929	+4.1%	¥35.7B ($230.5M)
2025-07-03	BUY	Market Buy	JPモルガン・アセット・マネジメント(アジア・パシフィック)リミテッドLimited) JPMorgan Asset Management (Asia Pacific	other	494.9K	¥2,929	+4.1%	¥1.4B ($9.4M)
2023-12-20	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	2.4M	¥2,978.5	+2.3%	¥7.1B ($46.0M)
2023-12-20	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	2.1M	¥2,978.5	+2.3%	¥6.2B ($40.1M)
2023-12-20	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	1.3M	¥2,978.5	+2.3%	¥3.9B ($25.4M)
2023-12-20	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	244.0K	¥2,978.5	+2.3%	¥727M ($4.7M)
2023-12-20	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	542.4K	¥2,978.5	+2.3%	¥1.6B ($10.4M)
2023-12-20	BUY	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク(BlackRock Financial Management BlackRock Financial Management, Inc.	passive	481.5K	¥2,978.5	+2.3%	¥1.4B ($9.3M)
2023-12-20	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー(BlackRock Advisers BlackRock Advisers, LLC	passive	248.2K	¥2,978.5	+2.3%	¥739M ($4.8M)
2023-12-20	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	2.3M	¥2,978.5	+2.3%	¥7.0B ($45.1M)
2022-05-30	BUY	negotiated	大塚装備株式会社 Otsuka Equipment Co., Ltd.	activist	63.6M	¥2,075	+46.9%	¥10.1B ($65.1M)
2022-05-30	SELL	negotiated	大塚裕司 Yuji Otsuka	activist	4.7M	¥2,075	-46.9%	¥10.1B ($65.4M)
2022-05-12	BUY	negotiated	大塚装備株式会社 Otsuka Equipment Co., Ltd.	activist	58.7M	¥1,900	+60.4%	¥111.6B ($719.9M)
2022-05-12	BUY	negotiated	大塚裕司 Yuji Otsuka	activist	9.6M	¥1,900	+60.4%	¥18.2B ($117.1M)
2022-04-27	BUY	negotiated	大塚装備株式会社 Otsuka Equipment Co., Ltd.	activist	9.8M	¥2,137.5	+42.6%	¥20.9B ($135.0M)
2022-04-27	BUY	negotiated	大塚裕司 Yuji Otsuka	activist	947.0K	¥2,137.5	+42.6%	¥2.0B ($13.1M)
2022-04-21	BUY	negotiated	大塚装備株式会社 Otsuka Equipment Co., Ltd.	activist	58.7M	¥2,090	+45.8%	¥122.7B ($791.9M)
2022-04-21	BUY	Market Buy	大塚装備株式会社 Otsuka Equipment Co., Ltd.	activist	58.7M	¥2,090	+45.8%	¥122.7B ($791.9M)
2022-04-21	BUY	Market Buy	大塚裕司 Yuji Otsuka	activist	9.6M	¥2,090	+45.8%	¥8.1B ($52.3M)
2022-04-21	BUY	negotiated	大塚裕司 Yuji Otsuka	activist	9.6M	¥2,090	+45.8%	¥8.1B ($52.3M)

Frequently asked questions

Who has been buying Otsuka Corporation stock?: 18 distinct investors have filed 20 disclosed large-shareholding filings in Otsuka Corporation (4768), most recently on 2025-07-18. 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 Otsuka Corporation have?: Otsuka Corporation has 20 buy-side and 5 sell-side disclosures on record, covering ¥40.8B ($263.1M) in total reported value, spanning 2022-04-21 to 2025-07-18.
Where does StockDrifts get Otsuka 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 Otsuka Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.