Who has been buying Infomart Corporation stock?

15 distinct investors have filed 31 disclosed large-shareholding filings in Infomart Corporation (2492), most recently on 2026-04-20. 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 Infomart Corporation have?

Infomart Corporation has 31 buy-side and 26 sell-side disclosures on record, covering ¥38.6B ($249.3M) in total reported value, spanning 2021-04-20 to 2026-04-20.

Where does StockDrifts get Infomart Corporation 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.

Infomart Corporation 2492

Company

株式会社インフォマートInfomart Corporation

Investors

Buys

Total Value

¥38.6B ($249.3M)

Avg Return

+8.88%

Last Filing

2026-04-20

Infomart Corporation (2492) has 31 disclosed large-shareholding filings and 26 disclosed disposals on record, filed by 15 distinct investors. Together those filings cover ¥38.6B ($249.3M) in reported transaction value. The earliest filing StockDrifts holds for Infomart Corporation is dated 2021-04-20; the most recent is 2026-04-20. 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 +8.88%, 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
2026-08-10	BUY	Market Buy	オアシスマネジメントカンパニーリミテッド(Oasis Management Company Ltd.) Oasis Management Company Ltd.	activist	26.1M	¥562	+9.3%	¥1.8B ($11.6M)
2026-08-04	BUY	Market Buy	オアシスマネジメントカンパニーリミテッド(Oasis Management Company Ltd.) Oasis Management Company Ltd.	activist	22.9M	¥527	+16.5%	¥1.5B ($9.6M)
2026-07-29	BUY	Market Buy	オアシスマネジメントカンパニーリミテッド(Oasis Management Company Ltd.) Oasis Management Company Ltd.	activist	20.0M	¥563	+9.1%	¥1.9B ($12.0M)
2026-07-22	SELL	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	857.8K	¥525	-16.9%	¥716M ($4.6M)
2026-07-22	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	7.6M	¥525	-16.9%	¥2.6B ($16.8M)
2026-07-22	BUY	Market Buy	オアシスマネジメントカンパニーリミテッド(Oasis Management Company Ltd.) Oasis Management Company Ltd.	activist	16.8M	¥525	+16.9%	¥1.7B ($10.8M)
2026-07-02	BUY	unknown	オアシスマネジメントカンパニーリミテッド(Oasis Management Company Ltd.) Oasis Management Company Ltd.	activist	13.6M	¥400	+42.3%	¥5.4B ($35.0M)
2026-04-20	SELL	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	2.2M	¥464	+16.8%	¥683M ($4.4M)
2026-04-20	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	12.5M	¥464	+16.8%	¥782M ($5.0M)
2026-04-03	BUY	private	株式会社第一ライフグループ Daiichi Life Group, Inc.	strategic	40.1M	¥471	-15.5%	¥18.9B ($121.9M)
2026-04-03	BUY	private	株式会社第一ライフグループ Daiichi Life Group, Inc.	strategic	40.1M	¥471	-15.5%	¥18.9B ($121.9M)
2026-03-05	BUY	private	第一生命ホールディングス株式会社 Dai-ichi Life Holdings, Inc.	strategic	40.1M	¥400	+16.0%	¥16.1B ($103.6M)
2026-02-05	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー(Baillie Gifford & Co) Baillie Gifford & Co	other	17.3M	¥393	-18.1%	¥1.1B ($7.1M)
2025-12-04	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	64.5M	¥373	+24.4%	¥1.0B ($6.6M)
2025-10-17	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	61.7M	¥316	+46.8%	¥697M ($4.5M)
2025-09-19	SELL	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	3.5M	¥351	-32.2%	¥282M ($1.8M)
2025-09-19	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	16.6M	¥351	-32.2%	¥738M ($4.8M)
2025-09-04	SELL	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	59.5M	¥356	-30.3%	¥951M ($6.1M)
2025-08-22	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	18.7M	¥374	-24.1%	¥437M ($2.8M)
2025-08-22	SELL	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	4.3M	¥374	-24.1%	¥669M ($4.3M)
2025-01-10	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	62.2M	¥291	+59.5%	¥913M ($5.9M)
2024-10-29	BUY	Market Buy	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	6.1M	¥369	+25.8%	¥287M ($1.9M)
2024-10-29	BUY	Market Buy	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	19.9M	¥369	+25.8%	¥689M ($4.4M)
2024-10-21	BUY	Market Buy	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	5.3M	¥365	+27.1%	¥28M ($183K)
2024-10-21	BUY	Market Buy	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	18.0M	¥365	+27.1%	¥928M ($6.0M)
2024-08-07	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	59.1M	¥246	+88.6%	¥785M ($5.1M)
2024-07-03	SELL	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	5.3M	¥308	-50.6%	¥431M ($2.8M)
2024-07-03	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	15.5M	¥308	-50.6%	¥447M ($2.9M)
2024-05-13	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	55.9M	¥306	+51.6%	¥953M ($6.1M)
2024-03-18	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	6.4M	¥399	+16.3%	¥2.6B ($16.5M)
2024-03-18	BUY	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	98.7K	¥399	+16.3%	¥3.1B ($20.1M)
2024-03-18	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	1.3M	¥399	+16.3%	¥522M ($3.4M)
2024-03-18	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	3.2M	¥399	-16.3%	¥31M ($200K)
2024-03-01	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	52.8M	¥432	+7.4%	¥1.2B ($8.0M)
2024-02-21	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	49.9M	¥378	+22.8%	¥1.2B ($7.5M)
2023-12-18	BUY	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	2.6M	¥428	+8.4%	¥1.1B ($7.1M)
2023-12-18	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	3.2M	¥428	+8.4%	¥1.4B ($8.9M)
2023-12-18	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	1.3M	¥428	+8.4%	¥558M ($3.6M)
2023-12-18	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	6.4M	¥428	+8.4%	¥2.7B ($17.7M)
2023-11-16	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	46.8M	¥459	+1.1%	¥1.2B ($8.0M)
2023-11-01	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	44.1M	¥351	+32.2%	¥1.0B ($6.7M)
2023-07-28	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	41.2M	¥405	+14.6%	¥1.1B ($7.1M)
2023-07-11	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	38.4M	¥334	+38.9%	¥1.1B ($7.2M)
2023-06-05	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	137.6K	¥258	-79.8%	¥589M ($3.8M)
2023-06-05	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.2M	¥258	+79.8%	¥107M ($691K)
2023-06-05	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	3.1M	¥258	-79.8%	¥161M ($1.0M)
2023-06-05	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	6.4M	¥258	+79.8%	¥1.7B ($10.7M)
2022-11-04	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド(Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	activist	35.1M	¥445	+4.3%	¥1.3B ($8.5M)
2022-04-05	SELL	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	104.0K	¥720	+35.6%	¥411M ($2.7M)
2022-04-05	BUY	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	321.0K	¥720	-35.6%	¥231M ($1.5M)

Showing the 50 most recent of 73 filings.

Frequently asked questions

Who has been buying Infomart Corporation stock?: 15 distinct investors have filed 31 disclosed large-shareholding filings in Infomart Corporation (2492), most recently on 2026-04-20. 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 Infomart Corporation have?: Infomart Corporation has 31 buy-side and 26 sell-side disclosures on record, covering ¥38.6B ($249.3M) in total reported value, spanning 2021-04-20 to 2026-04-20.
Where does StockDrifts get Infomart Corporation 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 Infomart Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.