Major Shareholders
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| Major shareholders | |||||||||||
| Major shareholders | |||||||||||
| Name | 
                                                JMC従業員持株会
                                                
                                             | 
                                                楽天証券株式会社
                                                
                                             | 
                                                鈴木 浩之
                                                
                                             | 
                                                株式会社SBI証券
                                                
                                             | 
                                                渡邊 大知
                                                
                                             | — | 
                                                JMC役員持株会
                                                
                                             | 
                                                JPモルガン証券株式会社
                                                
                                             | 
                                                渡邊商事株式会社
                                                
                                             | 
                                                松井証券株式会社
                                                
                                             | 
                                                山﨑 晴太郎
                                                
                                             | 
| Address | 
                                                神奈川県横浜市港北区新横浜2-5-5
                                                
                                             | 
                                                東京都港区南青山2-6-21
                                                
                                             | 
                                                東京都町田市
                                                
                                             | 
                                                東京都港区六本木1-6-1
                                                
                                             | 
                                                神奈川県横浜市都筑区
                                                
                                             | — | 
                                                神奈川県横浜市港北区新横浜2-5-5
                                                
                                             | 
                                                東京都千代田区丸の内2-7-3
                                                
                                             | 
                                                東京都渋谷区神南1-15-3
                                                
                                             | 
                                                東京都千代田区麹町1-4
                                                
                                             | 
                                                東京都世田谷区
                                                
                                             | 
| Number of shares held | 
                                                62,100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                175,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                404,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                84,376
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,264,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,478,376
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                59,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                73,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                214,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                63,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                76,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Shareholding ratio (excluding treasury shares) | 
                                                0.0112
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0317
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0730
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0152
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.2285
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.4478
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0108
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0133
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0387
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0115
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0138
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |