Japanese Companies Held by Activist Investors

Japanese listed companies for which at least one large shareholding or change report has been filed by an investor on our activist watchlist. Counts and dates reflect public filings only — a company staying on this list does not mean the investor still holds the position.

276 companies · as of latest filing: 2026-09-17

CompanyActivists on fileLatest filing date
KH Neochem Co.,Ltd.418922026-09-17
SMS CO.,LTD.217512026-09-16
KUSURI NO AOKI HOLDINGS CO.,LTD.354912026-09-16
GungHo Online Entertainment,Inc.376512026-09-16
SHARINGTECHNOLOGY.INC398912026-09-16
SOFT99corporation446412026-09-16
SHIBAURA MACHINE CO.,LTD.610412026-09-16
NIDEC CORPORATION659412026-09-16
ISB CORPORATION970212026-09-16
COMSYS Holdings Corporation172122026-09-15
M3,Inc.241312026-09-15
Infomart Corporation249222026-09-15
NIPPN CORPORATION200112026-09-14
LIFENET INSURANCE COMPANY715722026-09-14
Tokyo Kiraboshi Financial Group,Inc.717312026-09-14
TOA ROAD CORPORATION188212026-09-11
MEDIKIT CO.,LTD.774912026-09-11
NICHIREI CORPORATION287112026-09-10
J.FRONT RETAILING Co.,Ltd.308612026-09-10
YAMADA HOLDINGS CO.,LTD.983112026-09-10
KOBAYASHI PHARMACEUTICAL CO.,LTD.496712026-09-09
Yasuda Logistics Corporation932422026-09-09
SUZUKEN CO.,LTD.998712026-09-09
en Inc.484912026-09-07
NIKON CORPORATION773112026-09-07
SANYO SHOKAI LTD.801112026-09-07
ORO Co.,Ltd.398312026-09-04
Plus Alpha Consulting Co.,LTD.407112026-09-04
AIGAN CO.,LTD.985412026-09-04
A&D HOLON Holdings Company,Limited774512026-09-03
NIPPO LTD.991312026-09-03
MEDIPAL HOLDINGS CORPORATION745912026-09-02
Yamaha Motor Co.,Ltd.727212026-08-31
EXEDY Corporation727812026-08-28
Kakaku.com,Inc.237112026-08-27
WAKAMOTO PHARMACEUTICAL CO.,LTD.451212026-08-27
Wacom Co.,Ltd.672722026-08-26
Kawai Musical Instruments Manufacturing Co.,Ltd.795212026-08-26
Syuppin Co.,Ltd.317932026-08-25
Sanken Electric Co.,Ltd.670722026-08-25
Takihyo Co.,Ltd.998212026-08-25
KANTO DENKA KOGYO CO.,LTD.404712026-08-24
Mitsubishi Materials Corporation571112026-08-24
UACJ Corporation574112026-08-24
NORITZ CORPORATION594322026-08-24
MIURA CO.,LTD.600512026-08-24
AUCNET INC.396412026-08-21
YAGI & CO.,LTD.746012026-08-21
HAKUHODO DY HOLDINGS INCORPORATED243312026-08-20
EBARA JITSUGYO CO.,LTD.632822026-08-20
AIN HOLDINGS INC.962712026-08-20
CE Holdings Co.,Ltd.432012026-08-19
SANYO DENKI CO.,LTD.651612026-08-19
ValueCommerce Co.,Ltd.249112026-08-18
DENTSU SOKEN INC.481212026-08-17
NASU DENKI-TEKKO CO.,LTD.592222026-08-17
IWAKI CO.,LTD.623712026-08-17
TADANO LTD.639512026-08-14
CASIO COMPUTER CO.,LTD.695222026-08-13
MEISEI INDUSTRIAL Co.,Ltd.197622026-08-12
Tokuyama Corporation404312026-08-12
AEON Financial Service Co.,Ltd.857012026-08-12
SUMITOMO HEAVY INDUSTRIES,LTD.630212026-08-10
Japan Securities Finance Co.,Ltd.851112026-08-10
Timee,Inc.215A12026-08-07
Denyo Co.,Ltd.651712026-08-07
YELLOW HAT LTD.988212026-08-07
Aoyama Zaisan Networks Company,Limited892922026-08-06
Mitsubishi Paper Mills Limited386412026-08-05
Sumitomo Osaka Cement Co.,Ltd.523212026-08-05
株式会社アイ・グリッド・ソリューションズ603A12026-08-05
INTER ACTION Corporation772522026-08-04
Prestige International Inc.429012026-08-03
AIRMAN CORPORATION636412026-08-03
Keihanshin Building Co.,Ltd.881812026-08-03
BroadBand Tower,Inc.377612026-07-31
STELLA CHEMIFA CORPORATION410922026-07-31
INTAGE HOLDINGS Inc.432622026-07-31
Bunka Shutter Co.,Ltd.593022026-07-31
Soken Chemical & Engineering Co.,Ltd.497212026-07-30
JAPAN PURE CHEMICAL CO.,LTD.497312026-07-29
NIKKON Holdings Co.,Ltd.907222026-07-29
Nippon Chemical Industrial Co.,Ltd.409212026-07-28
HIRAKAWA HEWTECH CORP.582112026-07-28
FUJIKURA COMPOSITES Inc.512112026-07-27
EIKEN CHEMICAL CO.,LTD.454932026-07-24
Nippon Paper Industries Co.,Ltd.386312026-07-23
INES Corporation974222026-07-23
inspec Inc.665612026-07-22
FUJI KYUKO CO.,LTD.901022026-07-22
KURABO INDUSTRIES LTD.310612026-07-21
TAKI CHEMICAL CO.,LTD.402512026-07-21
KOMATSU MATERE Co.,Ltd.358012026-07-16
DeNA Co.,Ltd.243212026-07-15
MACNICA HOLDINGS,INC.313212026-07-15
nms Holdings Corporation216212026-07-14
Tokyo Cosmos Electric Co.,Ltd.677212026-07-14
TOSEI CORPORATION892312026-07-13
Kyoto Financial Group,Inc.584412026-07-09
SEIBU HOLDINGS INC.902412026-07-09
NISHIO HOLDINGS CO.,LTD.969912026-07-09
GOLDCREST Co.,Ltd.887112026-07-07
Keikyu Corporation900612026-07-06
Money Forward,Inc.399412026-07-03
TOREX SEMICONDUCTOR LTD.661612026-07-03
THE PACK CORPORATION395022026-07-02
SENKO Group Holdings Co.,Ltd.906922026-07-02
NAGAWA CO.,Ltd966312026-07-02
Internet Initiative Japan Inc.377412026-07-01
eole Inc.233412026-06-30
TAKARA & COMPANY LTD.792112026-06-30
Monex Group,Inc.869812026-06-30
Foster Electric Company,Limited679422026-06-26
TEIKOKU ELECTRIC MFG. CO.,LTD.633312026-06-25
Ferrotec Corporation689022026-06-25
YCP Holdings (Global) Limited925712026-06-23
KADOKAWA CORPORATION946812026-06-23
AIR WATER INC.408822026-06-22
Sekisui Jushi Corporation421222026-06-19
TSURUMI MANUFACTURING CO.,LTD.635112026-06-18
THE KINKI SHARYO CO.,LTD.712212026-06-17
RICOH COMPANY,LTD.775212026-06-15
MITSUI MATSUSHIMA HOLDINGS CO.,LTD.151812026-06-12
NORITAKE CO.,LIMITED533112026-06-11
CAWACHI LIMITED266412026-06-10
uSonar Co.,Ltd.431A12026-06-10
Sanwa Holdings Corporation592912026-06-10
Daicel Corporation420212026-06-09
Kawasaki Kisen Kaisha,Ltd.910712026-06-09
Orient Corporation858512026-06-08
Alfresa Holdings Corporation278412026-06-05
Advanced Media,Inc.377312026-06-05
ALPS ALPINE CO.,LTD.677012026-06-04
TIEMCO LTD.750112026-06-03
Shinko Shoji Co.,Ltd.814112026-06-03
Datasection Inc.390512026-06-02
KONICA MINOLTA,INC.490212026-06-02
DOWA HOLDINGS CO.,LTD.571412026-06-02
DAIHO CORPORATION182212026-05-28
MEITO CO.,LTD.220712026-05-27
Synchro Food Co.,Ltd.396322026-05-27
NIPPON KAYAKU CO.,LTD.427212026-05-27
IZUTSUYA CO.,LTD.826012026-05-26
ICOM INCORPORATED682012026-05-22
Pasona Group Inc.216812026-05-21
KPP GROUP HOLDINGS CO.,LTD.927412026-05-21
Kao Corporation445212026-05-20
YAMATO INTERNATIONAL INC.812712026-05-20
NIPPON EXPRESS HOLDINGS,INC.914712026-05-20
KANSAI PAINT CO.,LTD.461312026-05-19
NISSAN TOKYO SALES HOLDINGS CO.,LTD.829122026-05-18
Rengo Co.,Ltd.394112026-05-14
CALBEE,Inc.222912026-05-13
DIC Corporation463112026-05-13
TOKYO STEEL MANUFACTURING CO.,LTD.542312026-05-13
SUNCORPORATION673622026-05-13
HORIBA,Ltd.685612026-05-13
Aichi Financial Group,Inc.738912026-05-13
KOKUYO CO.,LTD.798412026-05-13
The Ogaki Kyoritsu Bank,Ltd.836112026-05-13
THE SHIGA BANK,LTD.836612026-05-13
The Hyakugo Bank,Ltd.836812026-05-13
Senshu Ikeda Holdings,Inc.871412026-05-13
eGuarantee,Inc.877122026-05-13
TAKARA HOLDINGS INC.253112026-05-12
Kanadevia Corporation700412026-05-12
ICHIKOH INDUSTRIES,LTD.724412026-05-12
DKK Co.,Ltd.670612026-05-11
KYB Corporation724212026-05-11
Human Technologies,Inc.562112026-05-08
Kumagai Gumi Co.,Ltd.186112026-05-01
NEOJAPAN Inc.392112026-05-01
SEPTENI HOLDINGS CO.,LTD.429312026-05-01
OYO Corporation975512026-04-23
TEIJIN LIMITED340112026-04-21
Ichiyoshi Securities Co.,Ltd.862412026-04-21
Fuva Brain Limited392712026-04-16
YODOKO,Ltd.545112026-04-16
YOMEISHU SEIZO CO.,LTD.254012026-04-15
FUJI MEDIA HOLDINGS,INC.467632026-04-15
TEIKOKU SEN-I Co.,Ltd.330222026-04-08
TAIYO HOLDINGS CO.,LTD.462612026-04-08
ASKA Pharmaceutical Holdings Co.,Ltd.488622026-04-08
SAWAI GROUP HOLDINGS Co.,Ltd.488712026-04-08
Teikoku Tsushin Kogyo Co.,Ltd.676322026-04-08
Helios Techno Holding Co.,Ltd.692722026-04-08
MURAKAMI CORPORATION729222026-04-08
MEIKO TRANS CO.,LTD.935712026-04-08
Cyber Security Cloud,Inc.449312026-04-07
Tamron Co.,Ltd.774012026-04-07
Yamatane Corporation930512026-04-07
Fujibo Holdings,Inc.310412026-04-06
TAMAI STEAMSHIP CO.,LTD912712026-03-31
Hokuetsu Corporation386512026-03-30
ASIRO Inc.737812026-03-26
KITAGAWA SEIKI CO.,LTD.632712026-03-24
SAXA,Inc.667512026-03-16
Mercuria Holdings Co.,Ltd.734722026-03-16
MAX CO.,LTD.645412026-03-12
Takashimaya Company,Limited823312026-03-05
Japan Asia Investment Company,Limited851812026-03-05
BUFFALO INC.667612026-03-04
NCD Co.,Ltd.478312026-03-03
SQUARE ENIX HOLDINGS CO.,LTD.968412026-03-03
Dai-ichi Life Holdings,Inc.875012026-02-27
Oriental Shiraishi Corporation178612026-02-26
Fudo Tetra Corporation181312026-02-26
OSAKA STEEL CO.,LTD.544922026-02-26
HEIWA REAL ESTATE CO.,LTD.880312026-02-26
BEAUTY GARAGE Inc.318012026-02-25
Inui Global Logistics Co.,Ltd.930822026-02-20
Anicom Holdings,Inc.871512026-02-16
Niterra Co.,Ltd.533412026-02-13
Japan System Techniques Co.,Ltd.432312026-02-12
DAIHATSU INFINEARTH MFG.CO.,LTD.602312026-02-06
JAPAN PULP AND PAPER COMPANY LIMITED803212026-02-06
Broadmedia Corporation434712026-02-04
RINNAI CORPORATION594712026-01-30
DAITO TRUST CONSTRUCTION CO.,LTD.187812026-01-27
NITTO KOHKI CO.,LTD.615112026-01-23
ATSUGI CO.,LTD.352912026-01-20
DTS CORPORATION968212026-01-20
WAVELOCK HOLDINGS CO.,LTD.794012025-12-25
PACIFIC METALS CO.,LTD.554122025-12-22
Sugimura Warehouse Co.,Ltd.930712025-12-22
Sumitomo Rubber Industries,Ltd.511012025-12-12
Maxell,Ltd.681012025-11-27
NITTOKU CO.,LTD.614512025-11-25
Stanley Electric Co.,Ltd.692312025-11-20
YOROZU CORPORATION729412025-11-20
MegaChips Corporation687512025-11-19
Nippon Fine Chemical Co.,Ltd.436212025-11-14
KANAME KOGYO CO.,LTD.656612025-11-07
System D Inc.380412025-10-29
NAFCO Co.,Ltd.279012025-10-22
Maruzen Showa Unyu Co.,Ltd.906812025-10-22
NICHIREKI GROUP CO.,LTD.501112025-10-17
NPC Incorporated625512025-10-17
ZUIKO CORPORATION627912025-10-17
UNISOL Holdings Corporation712812025-10-17
SANTEN PHARMACEUTICAL CO.,LTD.453612025-10-08
TOSOH CORPORATION404212025-10-02
Digital Garage,Inc.481912025-09-30
Trend Micro Incorporated470412025-09-29
Vertex Corporation529012025-09-29
Sata Construction Co.,Ltd.182612025-09-22
IRISO ELECTRONICS CO.,LTD.690812025-09-22
Ai Holdings Corporation307612025-09-19
MITSUI-SOKO HOLDINGS Co.,Ltd.930212025-09-12
RACCOON HOLDINGS,Inc.303112025-09-11
Wakita & Co.,LTD.812512025-08-29
TOHO HOLDINGS CO.,LTD.812912025-08-27
Nihon Tokushu Toryo Co.,Ltd.461912025-08-25
Ezaki Glico Co.,Ltd.220622025-08-22
ULVAC, Inc.672812025-08-22
Suruga Bank Ltd.835812025-08-22
Daito Pharmaceutical Co.,Ltd.457712025-08-15
KONISHI CO.,LTD.495612025-08-05
Valuence Holdings Inc.927012025-08-01
TSI HOLDINGS CO.,LTD.360812025-07-31
YAMATO CORPORATION196712025-07-30
EXEO Group,Inc.195112025-07-15
WIN-Partners Co.,Ltd.318312025-07-07
Nxera Pharma Co.,Ltd.456512025-06-25
TSUKISHIMA HOLDINGS CO.,LTD.633212025-05-28
AICHI STEEL CORPORATION548212025-05-23
K&O Energy Group Inc.166312025-05-22
YOTAI REFRACTORIES CO.,LTD.535712025-05-21
Nissha Co.,Ltd.791512025-05-21
PIOLAX,INC.598812025-04-14
Oji Holdings Corporation386112025-04-08
NIPPON SHOKUBAI CO.,LTD.411412025-03-28
Takachiho Co.,Ltd.822512025-03-26
Iida Group Holdings Co.,Ltd.329112025-03-21
DENTSU GROUP INC.432412025-03-21
FURUKAWA CO.,LTD.571512025-02-20

“Activists on file” counts distinct investors on our watchlist that have filed at least one large shareholding or change report for the company — it is not a current holder count. Once a stake drops to 5% or below, further changes may not be observable via EDINET. Source: EDINET (the Financial Services Agency’s electronic disclosure system), aggregated daily.