Historical shareholding details of
                        
                        Mr. D. Mark DeWalch
                        
                        holdings in Black Stone Minerals L.P. - Unit (BSM)
                    
                    
                        Monthly changes of
                        
                        Mr. D. Mark DeWalch
                        
                        shareholding in Black Stone Minerals L.P. - Unit
                        over the previous
                        months 
                    
                    
            
                
                    
                        | 
                            
                                Month
                            
                         | 
                        Name | 
                        Total no. shares held | 
                        
                        Percent Holding | 
                        
                        
                    
                    
                        
                        
                    
                
                
                    
                        
                            
                        
                        
                            | 
                                Oct 03, 2025
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                376,940
                             | 
                            
                            
                                0.18%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Jul 03, 2025
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                375,514
                             | 
                            
                            
                                0.18%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Apr 04, 2025
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                374,081
                             | 
                            
                            
                                0.18%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Jan 13, 2025
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                372,854
                             | 
                            
                            
                                0.18%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Jan 03, 2025
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                359,530
                             | 
                            
                            
                                0.17%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Oct 04, 2024
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                358,246
                             | 
                            
                            
                                0.17%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Aug 15, 2024
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                357,005
                             | 
                            
                            
                                0.17%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Jul 05, 2024
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                322,805
                             | 
                            
                            
                                0.16%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Apr 05, 2024
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                321,609
                             | 
                            
                            
                                0.16%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Feb 26, 2024
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                320,436
                             | 
                            
                            
                                0.16%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Jan 11, 2024
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                317,186
                             | 
                            
                            
                                0.15%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Nov 17, 2023
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                304,879
                             | 
                            
                            
                                0.15%
                             | 
                            
                            
                        
                    
                        
                            
                                
                                    | 
                                     | 
                                    
                                    
                                
                                
                        
                        
                            | 
                                Mar 06, 2023
                             | 
                            
                                
                                    Mr. D. Mark Dewalch
                                
                             | 
                            
                                260,879
                             | 
                            
                            
                                0.13%
                             | 
                            
                            
                        
                    
                
            
         
                 
                
                    
                        View all ownership details of Black Stone Minerals L.P. - Unit