Who has been buying NGK Insulators, Ltd. stock?

22 distinct investors have filed 25 disclosed large-shareholding filings in NGK Insulators, Ltd. (5333), most recently on 2026-02-19. 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 NGK Insulators, Ltd. have?

NGK Insulators, Ltd. has 25 buy-side and 24 sell-side disclosures on record, covering ¥85.6B ($552.4M) in total reported value, spanning 2021-10-06 to 2026-02-19.

Where does StockDrifts get NGK Insulators, 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.

NGK Insulators, Ltd. 5333

Company

日本碍子株式会社NGK Insulators, Ltd.

Investors

Buys

Total Value

¥85.6B ($552.4M)

Avg Return

+112.60%

Last Filing

2026-02-19

NGK Insulators, Ltd. (5333) has 25 disclosed large-shareholding filings and 24 disclosed disposals on record, filed by 22 distinct investors. Together those filings cover ¥85.6B ($552.4M) in reported transaction value. The earliest filing StockDrifts holds for NGK Insulators, Ltd. is dated 2021-10-06; the most recent is 2026-02-19. 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 +112.60%, 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
2026-05-22	BUY	Market Buy	BlackRock Investment ManagementLimited UK	passive	2.3M	¥5,861	+25.1%	¥514M ($3.3M)
2026-05-22	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.	passive	3.6M	¥5,861	+25.1%	¥5.1B ($33.2M)
2026-05-22	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ	passive	3.2M	¥5,861	+25.1%	¥1.7B ($11.1M)
2026-05-22	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	passive	679.8K	¥5,861	+25.1%	¥4.0B ($25.7M)
2026-05-22	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	passive	386.9K	¥5,861	+25.1%	¥2.3B ($14.6M)
2026-05-22	BUY	Market Buy	BlackRock Fund Managers Limited	passive	792.9K	¥5,861	+25.1%	¥171M ($1.1M)
2026-05-22	BUY	Market Buy	BlackRockBV Netherlands	passive	597.0K	¥5,861	+25.1%	¥343M ($2.2M)
2026-05-22	BUY	Market Buy	BlackRock Financial Management,Inc.	passive	363.2K	¥5,861	+25.1%	¥2.1B ($13.7M)
2026-05-22	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー	passive	806.1K	¥5,861	+25.1%	¥4.7B ($30.5M)
2026-05-22	BUY	Market Buy	ブラックロック・ジャパン株式会社	passive	5.1M	¥5,861	+25.1%	¥685M ($4.4M)
2026-02-19	SELL	Market Buy	第一生命保険株式会社 The Dai-ichi Life Insurance Company, Limited	passive	9.5M	¥4,388	-3.0%	¥25.0B ($161.3M)
2026-01-06	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	2.3M	¥3,410	+32.6%	¥10.3B ($66.2M)
2026-01-06	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	passive	2.8M	¥3,410	+32.6%	¥12.5B ($80.7M)
2026-01-06	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	3.0M	¥3,410	+32.6%	¥13.6B ($87.5M)
2026-01-06	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	671.8K	¥3,410	+32.6%	¥3.0B ($19.6M)
2026-01-06	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	771.9K	¥3,410	+32.6%	¥3.5B ($22.5M)
2026-01-06	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	547.4K	¥3,410	+32.6%	¥2.5B ($16.0M)
2026-01-06	BUY	Market Buy	ブラックロック・ジャパン株式会社	passive	5.1M	¥3,410	+32.6%	¥23.0B ($148.2M)
2025-09-19	BUY	unknown	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	8.7M	¥2,449.5	+84.6%	¥1.7B ($10.8M)
2025-09-19	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	6.0M	¥2,449.5	-84.6%	¥2.5B ($16.0M)
2025-05-21	SELL	Market Buy	第一生命保険株式会社 The Dai-ichi Life Insurance Company, Limited	passive	15.5M	¥1,753.5	-157.8%	¥7.5B ($48.2M)
2024-07-29	SELL	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	271.5K	¥2,079.5	-117.4%	¥65M ($419K)
2024-07-29	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	4.8M	¥2,079.5	+117.4%	¥714M ($4.6M)
2024-07-29	BUY	negotiated	MUFGセキュリティーズEMEA MUFG Securities EMEA plc	other	1.4M	¥2,079.5	+117.4%	¥3.0B ($19.1M)
2024-07-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	8.0M	¥2,079.5	-117.4%	¥1.2B ($7.5M)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	7.2M	¥2,079.5	+117.4%	¥15.0B ($96.7M)
2024-05-08	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.4M	¥2,106.5	+114.6%	¥17.7B ($114.5M)
2024-05-08	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	7.3M	¥2,106.5	+114.6%	¥15.4B ($99.4M)
2024-04-04	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	18.0M	¥2,020	+123.8%	¥63M ($407K)
2024-04-04	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	120.8K	¥2,020	+123.8%	¥16.6B ($106.9M)
2024-04-04	SELL	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	683.3K	¥2,020	-123.8%	¥11.2B ($72.4M)
2023-12-05	SELL	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	5.6M	¥1,723.5	-162.3%	¥269M ($1.7M)
2023-12-05	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	915.5K	¥1,723.5	+162.3%	¥1.6B ($10.2M)
2023-12-05	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 BlackRock Institutional Trust Company, N.A.	passive	1.5M	¥1,723.5	-162.3%	¥3.3B ($21.2M)
2023-12-05	SELL	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	2.6M	¥1,723.5	-162.3%	¥2.3B ($14.6M)
2023-12-05	SELL	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	422.1K	¥1,723.5	-162.3%	¥2.7B ($17.3M)
2023-12-05	SELL	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	638.4K	¥1,723.5	-162.3%	¥1.8B ($11.4M)
2023-12-05	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	471.0K	¥1,723.5	-162.3%	¥591M ($3.8M)
2023-12-05	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 BlackRock Financial Management, Inc.	passive	411.5K	¥1,723.5	-162.3%	¥484M ($3.1M)
2023-12-05	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	18.0M	¥1,723.5	-162.3%	¥1.4B ($9.0M)
2023-12-05	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	4.3M	¥1,723.5	+162.3%	¥6.8B ($43.7M)
2023-12-05	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	53.2K	¥1,723.5	+162.3%	¥92M ($592K)
2023-10-16	SELL	Market Buy	三菱UFJ不動産投資顧問株式会社 Mitsubishi UFJ Real Estate Investment Advisors Co., Ltd.	unknown	0	¥1,879.5	-140.5%	¥586M ($3.8M)
2023-10-16	BUY	Market Buy	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	326.9K	¥1,879.5	+140.5%	¥614M ($4.0M)
2023-10-16	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.4M	¥1,879.5	+140.5%	¥8.3B ($53.7M)
2023-10-16	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	8.5M	¥1,879.5	-140.5%	¥3.2B ($20.4M)
2023-10-16	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	7.2M	¥1,879.5	+140.5%	¥235M ($1.5M)
2023-07-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.5M	¥1,661.5	-172.1%	¥155M ($1.0M)
2023-07-06	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	7.0M	¥1,661.5	-172.1%	¥5.5B ($35.8M)
2023-04-05	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	894.8K	¥1,732	+161.0%	¥486M ($3.1M)

Showing the 50 most recent of 68 filings.

Frequently asked questions

Who has been buying NGK Insulators, Ltd. stock?: 22 distinct investors have filed 25 disclosed large-shareholding filings in NGK Insulators, Ltd. (5333), most recently on 2026-02-19. 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 NGK Insulators, Ltd. have?: NGK Insulators, Ltd. has 25 buy-side and 24 sell-side disclosures on record, covering ¥85.6B ($552.4M) in total reported value, spanning 2021-10-06 to 2026-02-19.
Where does StockDrifts get NGK Insulators, 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 NGK Insulators, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.