Who has been buying ULVAC, Inc. stock?

36 distinct investors have filed 59 disclosed large-shareholding filings in ULVAC, Inc. (6728), most recently on 2026-05-07. 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 ULVAC, Inc. have?

ULVAC, Inc. has 59 buy-side and 36 sell-side disclosures on record, covering ¥115.6B ($745.7M) in total reported value, spanning 2021-06-21 to 2026-05-07.

Where does StockDrifts get ULVAC, Inc. 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.

ULVAC, Inc. 6728

Company

株式会社アルバックULVAC, Inc.

Investors

Buys

Total Value

¥115.6B ($745.7M)

Avg Return

+55.08%

Last Filing

2026-05-07

ULVAC, Inc. (6728) has 59 disclosed large-shareholding filings and 36 disclosed disposals on record, filed by 36 distinct investors. Together those filings cover ¥115.6B ($745.7M) in reported transaction value. The earliest filing StockDrifts holds for ULVAC, Inc. is dated 2021-06-21; the most recent is 2026-05-07. 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 +55.08%, 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
2026-08-07	BUY	Market Buy	ニッセイ信用保証株式会社	passive	192.3K	¥8,779	+6.7%	¥1.7B ($10.9M)
2026-08-07	SELL	unknown	ニッセイアセットマネジメント株式会社	other	40.3K	¥8,779	-6.7%	¥173M ($1.1M)
2026-08-07	BUY	Market Buy	日本生命保険相互会社	passive	3.2M	¥8,779	+6.7%	¥28.5B ($183.6M)
2026-08-07	BUY	Market Buy	野村アセットマネジメント株式会社	other	2.3M	¥8,779	+6.7%	¥390M ($2.5M)
2026-08-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	57.9K	¥8,779	+6.7%	¥508M ($3.3M)
2026-08-07	SELL	unknown	野村證券株式会社	other	213.0K	¥8,779	-6.7%	¥5.8B ($37.2M)
2026-08-05	BUY	Market Buy	ウエリントン・マネージメント・カンパニー・エルエルピー Wellington Management Company LLP	other	418.3K	¥9,401	-0.3%	¥1.4B ($9.3M)
2026-08-05	SELL	unknown	ウエリントン・マネージメント・ホンコン・リミテッド Wellington Management Hong Kong Ltd	other	403.7K	¥9,401	+0.3%	¥3.0B ($19.5M)
2026-08-05	BUY	Market Buy	ウエリントン・マネージメント・ジャパン・ピーティーイー・リミテッド Wellington Management Japan Pte Ltd	other	1.5M	¥9,401	-0.3%	¥4.8B ($31.1M)
2026-08-05	SELL	unknown	ウエリントン・マネージメント・インターナショナル・リミテッド Wellington Management International Ltd	other	858.9K	¥9,401	+0.3%	¥1.4B ($9.3M)
2026-07-23	BUY	Market Buy	日本生命保険相互会社	passive	3.2M	¥9,986	-6.2%	¥32.4B ($208.8M)
2026-07-23	BUY	Market Buy	ニッセイ信用保証株式会社	passive	192.3K	¥9,986	-6.2%	¥1.9B ($12.4M)
2026-07-23	BUY	unknown	ニッセイアセットマネジメント株式会社	other	57.3K	¥9,986	-6.2%	¥572M ($3.7M)
2026-07-06	BUY	Market Buy	野村アセットマネジメント株式会社	other	2.3M	¥9,768	-3.8%	¥241M ($1.6M)
2026-07-06	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	35.7K	¥9,768	+3.8%	¥6.2B ($40.1M)
2026-07-06	BUY	Market Buy	野村證券株式会社	other	869.2K	¥9,768	-3.8%	¥5.5B ($35.8M)
2026-06-22	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	672.7K	¥10,290	-7.7%	¥152M ($983K)
2026-06-22	BUY	Market Buy	野村證券株式会社	other	300.7K	¥10,290	-7.7%	¥1.2B ($7.5M)
2026-06-22	BUY	Market Buy	野村アセットマネジメント株式会社	other	2.3M	¥10,290	-7.7%	¥559M ($3.6M)
2026-06-05	BUY	unknown	エフアイエルインベストメントアドバイザーズユーケーリミテッドLimited) FIL Investment Advisors (UK	other	59.6K	¥8,829	+14.2%	¥526M ($3.4M)
2026-06-05	BUY	Market Buy	エフアイエルインベストメンツインターナショナル FIL Investments International	other	4.0M	¥8,829	+14.2%	¥6.4B ($41.3M)
2026-05-19	BUY	Market Buy	野村アセットマネジメント株式会社	other	2.2M	¥9,234	-4.4%	¥1.0B ($6.5M)
2026-05-19	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	658.4K	¥9,234	-4.4%	¥3.0B ($19.1M)
2026-05-19	BUY	Market Buy	野村證券株式会社	other	185.3K	¥9,234	-4.4%	¥638M ($4.1M)
2026-05-07	BUY	unknown	野村アセットマネジメント株式会社	other	2.1M	¥10,485	-15.8%	¥22.1B ($142.5M)
2026-05-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	335.9K	¥10,485	-15.8%	¥3.5B ($22.7M)
2026-05-07	BUY	unknown	野村證券株式会社	other	117.1K	¥10,485	-15.8%	¥1.2B ($7.9M)
2026-02-05	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	3.9M	¥8,240	+18.4%	¥4.8B ($30.7M)
2025-12-18	BUY	Market Buy	ウエリントン・マネージメント・カンパニー・エルエルピー Wellington Management Company LLP	other	264.9K	¥6,565	-48.6%	¥2.6B ($16.7M)
2025-12-18	BUY	Market Buy	ウエリントン・マネージメント・ホンコン・リミテッド Wellington Management Hong Kong Ltd	other	726.1K	¥6,565	+48.6%	¥7.1B ($45.7M)
2025-12-18	BUY	Market Buy	ウエリントン・マネージメント・ジャパン・ピーティーイー・リミテッド Wellington Management Japan Pte Ltd	other	997.7K	¥6,565	+48.6%	¥9.7B ($62.8M)
2025-12-18	SELL	Market Buy	ウエリントン・マネージメント・インターナショナル・リミテッド Wellington Management International Ltd	other	1.0M	¥6,565	-48.6%	¥9.9B ($63.8M)
2025-11-20	BUY	Market Buy	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	2.0M	¥6,679	+46.1%	¥3.7B ($24.0M)
2025-11-20	SELL	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	1.1M	¥6,679	-46.1%	¥462M ($3.0M)
2025-11-20	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	233.9K	¥6,679	+46.1%	¥1.6B ($10.1M)
2025-10-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.8M	¥6,680	+46.1%	¥11.7B ($75.7M)
2025-10-06	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	5.0K	¥6,680	-46.1%	¥66M ($425K)
2025-10-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	567.7K	¥6,680	+46.1%	¥1.5B ($9.6M)
2025-09-19	BUY	unknown	ウエリントン・マネージメント・ホンコン・リミテッド Wellington Management Hong Kong Ltd	other	489.1K	¥6,668	+46.3%	¥3.3B ($21.0M)
2025-09-19	BUY	unknown	ウエリントン・マネージメント・ジャパン・ピーティーイー・リミテッド Wellington Management Japan Pte Ltd	other	951.8K	¥6,668	+46.3%	¥6.3B ($40.9M)
2025-09-19	BUY	Market Buy	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	1.4M	¥6,668	+46.3%	¥3.3B ($21.0M)
2025-09-19	SELL	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	1.2M	¥6,668	-46.3%	¥889M ($5.7M)
2025-09-19	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	233.9K	¥6,668	+46.3%	¥1.6B ($10.1M)
2025-09-19	BUY	unknown	ウエリントン・マネージメント・インターナショナル・リミテッド Wellington Management International Ltd	other	1.0M	¥6,668	+46.3%	¥6.9B ($44.4M)
2025-08-22	BUY	Market Buy	Baku株式会社 Baku Co., Ltd.	activist	130.9K	¥6,156	+58.5%	¥806M ($5.2M)
2025-08-22	SELL	Market Buy	タイヨウ・パシフィック・パートナーズ・エルピー Taiyo Pacific Partners L.P.	activist	1.9M	¥6,156	-58.5%	¥3.3B ($21.0M)
2025-08-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.8M	¥5,499	+77.5%	¥9.7B ($62.3M)
2025-08-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	345.0K	¥5,499	+77.5%	¥1.9B ($12.2M)
2025-08-06	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	505.7K	¥5,499	+77.5%	¥2.8B ($17.9M)
2025-07-31	BUY	Market Buy	Baku株式会社 Baku Co., Ltd.	activist	130.9K	¥5,607	+74.0%	¥734M ($4.7M)

Showing the 50 most recent of 152 filings.

Frequently asked questions

Who has been buying ULVAC, Inc. stock?: 36 distinct investors have filed 59 disclosed large-shareholding filings in ULVAC, Inc. (6728), most recently on 2026-05-07. 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 ULVAC, Inc. have?: ULVAC, Inc. has 59 buy-side and 36 sell-side disclosures on record, covering ¥115.6B ($745.7M) in total reported value, spanning 2021-06-21 to 2026-05-07.
Where does StockDrifts get ULVAC, Inc. 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 ULVAC, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.