Who has been buying inspec Inc. stock?

6 distinct investors have filed 7 disclosed large-shareholding filings in inspec Inc. (6656), most recently on 2026-04-14. 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 inspec Inc. have?

inspec Inc. has 7 buy-side and 14 sell-side disclosures on record, covering ¥2.9B ($19.0M) in total reported value, spanning 2021-04-14 to 2026-04-14.

Where does StockDrifts get inspec 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.

inspec Inc. 6656

Company

インスペック株式会社inspec Inc.

Investors

Buys

Total Value

¥2.9B ($19.0M)

Avg Return

-42.59%

Last Filing

2026-04-14

inspec Inc. (6656) has 7 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥2.9B ($19.0M) in reported transaction value. The earliest filing StockDrifts holds for inspec Inc. is dated 2021-04-14; the most recent is 2026-04-14. 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 -42.59%, 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
2026-07-22	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	391.2K	¥1,094	-20.2%	¥50M ($326K)
2026-07-09	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	345.0K	¥1,210	-25.0%	¥57M ($370K)
2026-07-02	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	297.7K	¥1,202	-21.5%	¥56M ($364K)
2026-06-30	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	250.8K	¥1,208	-7.6%	¥60M ($388K)
2026-06-15	BUY	unknown	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	201.1K	¥1,122	+7.8%	¥226M ($1.5M)
2026-04-14	BUY	negotiated	菅原美樹	activist	4.0K	¥619	+33.1%	¥2M ($16K)
2026-04-14	SELL	negotiated	菅原雅史	activist	194.3K	¥619	-33.1%	¥62M ($401K)
2026-04-14	SELL	Market Buy	ハヤテマネジメント株式会社 Hayate Management	activist	0	¥619	-33.1%	¥234M ($1.5M)
2025-06-25	BUY	negotiated	菅原美樹 Miki Sugawara	activist	4.0K	¥675	-3.4%	¥3M ($17K)
2025-06-25	BUY	negotiated	菅原美樹 Miki Sugawara	activist	4.0K	¥675	-3.4%	¥3M ($17K)
2025-06-25	SELL	negotiated	菅原雅史 Masashi Sugawara	activist	300.9K	¥675	+3.4%	¥33M ($215K)
2025-06-25	SELL	negotiated	菅原雅史 Masashi Sugawara	activist	300.9K	¥675	+3.4%	¥33M ($215K)
2025-04-18	SELL	Market Buy	ハヤテインベストメント株式会社 Hayate Investment	activist	0	¥579	-12.6%	¥219M ($1.4M)
2025-04-18	BUY	Market Buy	ハヤテマネジメント株式会社 Hayate Management	activist	416.5K	¥579	+12.6%	¥241M ($1.6M)
2025-03-27	BUY	negotiated	菅原美樹 Miki Sugawara	activist	4.0K	¥590	+10.5%	¥2M ($15K)
2025-03-27	BUY	negotiated	菅原美樹 Miki Sugawara	activist	4.0K	¥590	+10.5%	¥2M ($15K)
2025-03-27	SELL	negotiated	菅原雅史 Masashi Sugawara	activist	351.1K	¥590	-10.5%	¥27M ($175K)
2025-03-27	SELL	negotiated	菅原雅史 Masashi Sugawara	activist	351.1K	¥590	-10.5%	¥27M ($175K)
2024-04-26	BUY	Market Buy	ハヤテパートナーズピーティーイーエルティーディー(HAYATE PARTNERS PTE LTD) HAYATE PARTNERS PTE LTD	activist	0	¥962	-32.2%	¥368M ($2.4M)
2024-04-26	BUY	Market Buy	ハヤテインベストメント株式会社 Hayate Investment	activist	416.5K	¥962	-32.2%	¥363M ($2.3M)
2024-04-26	SELL	Market Buy	ハヤテパートナーズピーティーイーエルティーディー(HAYATE PARTNERS PTE LTD) HAYATE PARTNERS PTE LTD	activist	0	¥962	+32.2%	¥368M ($2.4M)
2024-04-26	BUY	Market Buy	ハヤテインベストメント株式会社 Hayate Investment	activist	420.4K	¥962	-32.2%	¥366M ($2.4M)
2024-04-26	BUY	Market Buy	ハヤテインベストメント株式会社 Hayate Investment	activist	420.4K	¥962	-32.2%	¥366M ($2.4M)
2023-01-30	SELL	negotiated	菅原美樹 Miki Sugawara	activist	4.0K	¥1,019	+36.0%	¥406K ($3K)
2023-01-30	BUY	negotiated	菅原雅史 Masashi Sugawara	activist	397.4K	¥1,019	-36.0%	¥388M ($2.5M)
2023-01-30	BUY	negotiated	菅原雅史 Masashi Sugawara	activist	397.4K	¥1,019	-36.0%	¥388M ($2.5M)
2023-01-30	SELL	negotiated	菅原美樹 Miki Sugawara	activist	4.0K	¥1,019	+36.0%	¥406K ($3K)
2022-08-24	SELL	Market Buy	ハヤテパートナーズピーティーイーエルティーディー(HAYATE PARTNERS PTE LTD) HAYATE PARTNERS PTE LTD	activist	420.4K	¥1,364	+52.2%	¥63M ($406K)
2022-08-08	SELL	Market Buy	ハヤテパートナーズピーティーイーエルティーディー(HAYATE PARTNERS PTE LTD) HAYATE PARTNERS PTE LTD	activist	471.4K	¥1,239	+47.4%	¥50M ($320K)
2022-06-15	SELL	Market Buy	ハヤテパートナーズピーティーイーエルティーディー(HAYATE PARTNERS PTE LTD) HAYATE PARTNERS PTE LTD	activist	516.2K	¥1,327	+50.9%	¥54M ($345K)
2022-06-08	SELL	Market Buy	ハヤテパートナーズピーティーイーエルティーディー(HAYATE PARTNERS PTE LTD) HAYATE PARTNERS PTE LTD	activist	561.6K	¥1,635	+60.1%	¥63M ($404K)
2021-04-15	BUY	negotiated	菅原美樹 Miki Sugawara	activist	4.0K	¥2,082	-68.7%	¥8M ($54K)
2021-04-15	BUY	Market Buy	菅原美樹 Miki Sugawara	activist	4.0K	¥2,082	-68.7%	¥8M ($54K)
2021-04-15	BUY	Market Buy	菅原雅史 Masashi Sugawara	activist	383.7K	¥2,082	-68.7%	¥140M ($906K)
2021-04-15	BUY	negotiated	菅原雅史 Masashi Sugawara	activist	383.7K	¥2,082	-68.7%	¥140M ($906K)
2021-04-14	BUY	Market Buy	ハヤテパートナーズピーティーイーエルティーディー(HAYATE PARTNERS PTE LTD) HAYATE PARTNERS PTE LTD	activist	605.8K	¥2,110	-69.1%	¥1.3B ($8.2M)

Frequently asked questions

Who has been buying inspec Inc. stock?: 6 distinct investors have filed 7 disclosed large-shareholding filings in inspec Inc. (6656), most recently on 2026-04-14. 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 inspec Inc. have?: inspec Inc. has 7 buy-side and 14 sell-side disclosures on record, covering ¥2.9B ($19.0M) in total reported value, spanning 2021-04-14 to 2026-04-14.
Where does StockDrifts get inspec 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 inspec Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.