Who has been buying Computer Management Co., Ltd. stock?

4 distinct investors have filed 15 disclosed large-shareholding filings in Computer Management Co., Ltd. (4491), most recently on 2025-10-10. 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 Computer Management Co., Ltd. have?

Computer Management Co., Ltd. has 15 buy-side and 12 sell-side disclosures on record, covering ¥341M ($2.2M) in total reported value, spanning 2021-10-12 to 2025-10-10.

Where does StockDrifts get Computer Management Co., 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.

Computer Management Co., Ltd. 4491

Company

コンピューターマネージメント株式会社Computer Management Co., Ltd.

Investors

Buys

Total Value

¥341M ($2.2M)

Avg Return

+93.93%

Last Filing

2025-10-10

Computer Management Co., Ltd. (4491) has 15 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥341M ($2.2M) in reported transaction value. The earliest filing StockDrifts holds for Computer Management Co., Ltd. is dated 2021-10-12; the most recent is 2025-10-10. 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 +93.93%, 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
2025-10-10	SELL	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	unknown	0	¥2,529	-19.2%	¥40M ($256K)
2025-10-10	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	150.6K	¥2,529	-19.2%	¥5M ($30K)
2025-10-10	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	136.6K	¥2,529	-19.2%	¥9M ($60K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	15.6K	¥3,145	-4.1%	¥49M ($317K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥3,145	-4.1%	¥480M ($3.1M)
2025-09-26	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	140.2K	¥3,145	+4.1%	¥31M ($203K)
2025-09-19	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥3,015	+0.0%	¥460M ($3.0M)
2025-09-19	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	150.3K	¥3,015	+0.0%	¥6M ($40K)
2025-09-19	SELL	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	15.6K	¥3,015	+0.0%	¥57M ($365K)
2025-08-22	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥2,940	+2.5%	¥447M ($2.9M)
2025-08-22	SELL	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	34.5K	¥2,940	-2.5%	¥60M ($387K)
2025-08-22	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥2,940	-2.5%	¥599K ($4K)
2025-07-18	SELL	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	54.8K	¥2,604	-15.8%	¥55M ($352K)
2025-07-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥2,604	+15.8%	¥397M ($2.6M)
2025-07-18	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥2,604	+15.8%	¥396M ($2.6M)
2025-06-02	BUY	unknown	有限会社シー・エム・ケー CMK Ltd.	strategic	731.5K	¥2,501	+20.6%	¥162M ($1.0M)
2025-06-02	SELL	unknown	有限会社シー・エム・ケー CMK Ltd.	strategic	731.5K	¥2,501	-20.6%	¥162M ($1.0M)
2025-06-02	BUY	unknown	有限会社シー・エム・ケー CMK Ltd.	strategic	731.5K	¥2,501	+20.6%	¥162M ($1.0M)
2025-04-14	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	75.8K	¥1,666	+81.0%	¥35M ($228K)
2025-04-14	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥1,666	+81.0%	¥254M ($1.6M)
2025-04-14	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥1,666	+81.0%	¥254M ($1.6M)
2024-11-27	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	54.5K	¥1,612	+87.0%	¥33M ($214K)
2024-11-27	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥1,612	+87.0%	¥246M ($1.6M)
2024-11-27	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥1,612	+87.0%	¥245M ($1.6M)
2024-08-21	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥1,560	+93.3%	¥238M ($1.5M)
2024-08-21	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥1,560	+93.3%	¥237M ($1.5M)
2024-08-21	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	34.1K	¥1,560	+93.3%	¥32M ($207K)
2024-06-04	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	13.4K	¥1,647	+83.1%	¥22M ($142K)
2024-06-04	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	152.5K	¥1,647	+83.1%	¥13M ($82K)
2024-06-04	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥1,647	-83.1%	¥335K ($2K)
2024-01-04	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	144.6K	¥1,520	+98.4%	¥36M ($231K)
2024-01-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥1,520	+98.4%	¥231M ($1.5M)
2023-09-27	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	121.0K	¥1,458	+106.8%	¥30M ($193K)
2023-09-27	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥1,458	+106.8%	¥222M ($1.4M)
2023-07-06	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	100.6K	¥1,503	-100.6%	¥306K ($2K)
2023-07-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	152.2K	¥1,503	+100.6%	¥31M ($203K)
2023-06-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	131.2K	¥1,417	+112.8%	¥30M ($193K)
2023-06-16	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	100.6K	¥1,417	+112.8%	¥143M ($920K)
2023-03-16	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	100.6K	¥1,457	+106.9%	¥147M ($946K)
2023-03-16	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	109.9K	¥1,457	+106.9%	¥31M ($201K)
2022-09-01	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	44.3K	¥1,502.5	+100.7%	¥16M ($102K)
2022-09-01	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	50.3K	¥1,502.5	+100.7%	¥76M ($488K)
2022-03-14	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	50.3K	¥1,577.5	+91.1%	¥79M ($512K)
2022-03-14	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	33.7K	¥1,577.5	+91.1%	¥17M ($111K)
2022-01-25	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	50.3K	¥1,475	+104.4%	¥74M ($479K)
2022-01-25	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	22.9K	¥1,475	+104.4%	¥15M ($99K)
2021-12-09	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	12.5K	¥1,720	+75.3%	¥19M ($124K)
2021-12-09	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	50.3K	¥1,720	+75.3%	¥87M ($558K)
2021-10-12	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	50.3K	¥1,640	+83.8%	¥82M ($532K)
2021-10-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.3K	¥1,640	+83.8%	¥2M ($14K)

Frequently asked questions

Who has been buying Computer Management Co., Ltd. stock?: 4 distinct investors have filed 15 disclosed large-shareholding filings in Computer Management Co., Ltd. (4491), most recently on 2025-10-10. 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 Computer Management Co., Ltd. have?: Computer Management Co., Ltd. has 15 buy-side and 12 sell-side disclosures on record, covering ¥341M ($2.2M) in total reported value, spanning 2021-10-12 to 2025-10-10.
Where does StockDrifts get Computer Management Co., 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 Computer Management Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.