Who has been buying Photosynth inc. stock?

11 distinct investors have filed 16 disclosed large-shareholding filings in Photosynth inc. (4379), most recently on 2026-03-10. 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 Photosynth inc. have?

Photosynth inc. has 16 buy-side and 9 sell-side disclosures on record, covering ¥11.6B ($74.5M) in total reported value, spanning 2021-11-12 to 2026-03-10.

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.

Photosynth inc. 4379

Company

株式会社PhotosynthPhotosynth inc.

Investors

Buys

Total Value

¥11.6B ($74.5M)

Avg Return

-17.36%

Last Filing

2026-03-10

Photosynth inc. (4379) has 16 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥11.6B ($74.5M) in reported transaction value. The earliest filing StockDrifts holds for Photosynth inc. is dated 2021-11-12; the most recent is 2026-03-10. Across these filings the average return since disclosure is -17.36%, 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
2026-06-26	BUY	Market Buy	光通信株式会社	passive	1.2M	¥379	+34.0%	¥46M ($295K)
2026-06-26	BUY	Market Buy	株式会社UH Partners 2	passive	1.2M	¥379	-	-
2026-06-26	BUY	Market Buy	株式会社UH Partners 3	passive	44.1K	¥379	-	¥17M ($108K)
2026-06-26	BUY	Market Buy	株式会社UH6	passive	85.3K	¥379	-	¥32M ($209K)
2026-06-26	SELL	unknown	株式会社UH5	unknown	0	¥379	-34.0%	¥33M ($210K)
2026-06-05	BUY	Market Buy	エフアイエルインベストメントマネジメントホンコンリミテッド(FIL Investment Management (Hong Kong) Limited) FIL Investment Management (Hong Kong) Limited	other	1.2M	¥415	+22.4%	¥71M ($457K)
2026-06-05	BUY	Market Buy	エフアイエルインベストメントマネジメントホンコンリミテッド(FIL Investment Management (Hong Kong) Limited) FIL Investment Management (Hong Kong) Limited	other	1.4M	¥415	+22.4%	¥66M ($427K)
2026-03-10	BUY	Market Buy	河瀬航大	activist	3.3M	¥498	+2.0%	¥235M ($1.5M)
2026-03-10	SELL	Market Buy	Kawase&Co.合同会社	activist	70.0K	¥498	-2.0%	¥779K ($5K)
2026-03-10	BUY	Market Buy	河瀬航大	activist	3.3M	¥498	+2.0%	¥235M ($1.5M)
2026-03-10	SELL	Market Buy	Kawase&Co.合同会社	activist	70.0K	¥498	-2.0%	¥779K ($5K)
2026-01-22	BUY	Market Buy	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.3M	¥430	+18.1%	¥87M ($564K)
2026-01-22	BUY	Market Buy	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.3M	¥430	+18.1%	¥87M ($564K)
2026-01-09	BUY	Market Buy	光通信株式会社	passive	1.0M	¥433	+17.3%	¥72M ($468K)
2026-01-09	BUY	Market Buy	株式会社UH5	passive	85.3K	¥433	-	-
2026-01-09	BUY	Market Buy	株式会社UH Partners 2	passive	1.2M	¥433	-	-
2025-12-24	BUY	Market Buy	光通信株式会社	passive	875.9K	¥453	+12.1%	¥79M ($512K)
2025-12-24	BUY	Market Buy	株式会社UH Partners 2	passive	1.2M	¥453	-	-
2025-12-24	BUY	Market Buy	株式会社UH5	passive	85.3K	¥453	-	-
2025-12-12	SELL	Market Buy	農林中金キャピタル株式会社 Norinchukin Capital Co., Ltd.	passive	0	¥359	-41.5%	¥436M ($2.8M)
2025-12-12	BUY	Market Buy	光通信株式会社	passive	700.8K	¥359	+41.5%	¥252M ($1.6M)
2025-12-12	BUY	Market Buy	株式会社UH Partners 2	passive	1.2M	¥359	+41.5%	¥432M ($2.8M)
2025-12-12	BUY	Market Buy	株式会社UH5	passive	85.3K	¥359	+41.5%	¥31M ($198K)
2025-10-07	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.1M	¥346	-46.8%	¥76M ($492K)
2025-10-07	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.1M	¥346	-46.8%	¥76M ($492K)
2025-09-05	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.4M	¥338	-50.3%	¥71M ($460K)
2025-09-05	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.4M	¥338	-50.3%	¥71M ($460K)
2022-12-20	SELL	Market Buy	農林中央金庫 The Norinchukin Bank	passive	0	¥300	-69.3%	¥364M ($2.3M)
2022-12-09	BUY	Market Buy	農林中金キャピタル株式会社 Norinchukin Capital Co., Ltd.	passive	1.2M	¥325	+56.3%	¥391M ($2.5M)
2022-02-07	SELL	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	676.8K	¥481	-5.6%	¥84M ($540K)
2022-01-21	BUY	Market Buy	農林中央金庫 The Norinchukin Bank	passive	1.2M	¥549	-	¥5M ($33K)
2022-01-13	SELL	Market Buy	農林中央金庫 The Norinchukin Bank	passive	1.2M	¥639	+20.5%	¥6M ($38K)
2021-12-21	SELL	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	0	¥747	+32.0%	¥6M ($38K)
2021-12-21	BUY	unknown	大和企業投資株式会社 Daiwa Corporate Investment Co., Ltd.	passive	122.2K	¥747	-	-
2021-12-06	BUY	unknown	大和企業投資株式会社 Daiwa Corporate Investment Co., Ltd.	passive	122.2K	¥959	-47.0%	¥117M ($756K)
2021-12-06	BUY	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	788.9K	¥959	-47.0%	¥757M ($4.9M)
2021-11-22	BUY	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.5M	¥1,290	-60.6%	¥2.0B ($12.7M)
2021-11-22	BUY	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.5M	¥1,290	-60.6%	¥2.0B ($12.7M)
2021-11-19	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	842.5K	¥1,348	-62.3%	¥1.1B ($7.3M)
2021-11-18	BUY	Market Buy	農林中央金庫 The Norinchukin Bank	passive	1.2M	¥1,386	-63.4%	¥1.7B ($10.7M)
2021-11-12	BUY	unknown	河瀬航大 KODAI KAWSE	activist	2.6M	¥1,319	-61.5%	¥3.5B ($22.4M)
2021-11-12	BUY	unknown	Kawase&Co.合同会社 Kawase&Co. LLC	activist	70.0K	¥1,319	-61.5%	¥92M ($596K)

Frequently asked questions

Who has been buying Photosynth inc. stock?: 11 distinct investors have filed 16 disclosed large-shareholding filings in Photosynth inc. (4379), most recently on 2026-03-10. 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 Photosynth inc. have?: Photosynth inc. has 16 buy-side and 9 sell-side disclosures on record, covering ¥11.6B ($74.5M) in total reported value, spanning 2021-11-12 to 2026-03-10.
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.