| 
            Q3 2018
           | 
          24 | 
          54,087 | 
          
            
              BRK-B, BKNG, META, AER
            
           | 
          
            13F-HR
           | 
          11/14/2018 | 
          000095012318011687 | 
        
        
          | 
            Q2 2018
           | 
          26 | 
          62,762 | 
          
            
              BRK-B, CSCO calls, BRO, SNE
            
           | 
          
            13F-HR
           | 
          8/14/2018 | 
          000095012318008726 | 
        
        
          | 
            Q1 2018
           | 
          25 | 
          66,445 | 
          
            
              SPY calls, BRK-B, SPY puts, GOOG
            
           | 
          
            13F-HR
           | 
          5/15/2018 | 
          000095012318005564 | 
        
        
          | 
            Q4 2017
           | 
          30 | 
          63,090 | 
          
            
              SPY calls, BRK-B, SPY puts, GOOG
            
           | 
          
            13F-HR
           | 
          2/14/2018 | 
          000095012318002162 | 
        
        
          | 
            Q3 2017
           | 
          29 | 
          57,752 | 
          
            
              SPY, BRK-B, GOOG, IBKR
            
           | 
          
            13F-HR
           | 
          11/14/2017 | 
          000095012317010649 | 
        
        
          | 
            Q2 2017
           | 
          23 | 
          37,891 | 
          
            
              BRK-B, IBKR, FC, META calls
            
           | 
          
            13F-HR
           | 
          8/14/2017 | 
          000095012317007772 | 
        
        
          | 
            Q1 2017
           | 
          22 | 
          47,092 | 
          
            
              TSLA puts, BRK-B, SPY, IAC
            
           | 
          
            13F-HR
           | 
          5/15/2017 | 
          000095012317005122 | 
        
        
          | 
            Q4 2016
           | 
          22 | 
          46,399 | 
          
            
              SPY calls, BRK-B, CTSH, ALLEGHANY CORP DEL
            
           | 
          
            13F-HR
           | 
          2/14/2017 | 
          000095012317002203 | 
        
        
          | 
            Q3 2016
           | 
          30 | 
          52,909 | 
          
            
              SPY puts, BRK-B, ALLEGHANY CORP DEL, IAC
            
           | 
          
            13F-HR
           | 
          11/14/2016 | 
          000095012316022165 | 
        
        
          | 
            Q2 2016
           | 
          36 | 
          69,073 | 
          
            
              SPY puts, BRK-B, AAPL, ALLEGHANY CORP DEL
            
           | 
          
            13F-HR
           | 
          8/15/2016 | 
          000095012316019983 | 
        
        
          | 
            Q1 2016
           | 
          27 | 
          48,926 | 
          
            
              ALLEGHANY CORP DEL, BRK-B, AAPL, TTEK
            
           | 
          
            13F-HR
           | 
          5/16/2016 | 
          000095012316017473 | 
        
        
          | 
            Q4 2015
           | 
          18 | 
          34,632 | 
          
            
              BRK-B, AAPL, ALLEGHANY CORP DEL, TTEK
            
           | 
          
            13F-HR
           | 
          2/16/2016 | 
          000095012316014839 | 
        
        
          | 
            Q3 2015
           | 
          33 | 
          66,485 | 
          
            
              ALLEGHANY CORP DEL, KLIC, TRK, BRK-B
            
           | 
          
            13F-HR
           | 
          11/16/2015 | 
          000095012315012097 | 
        
        
          | 
            Q2 2015
           | 
          27 | 
          58,532 | 
          
            
              ALLEGHANY CORP DEL, KLIC, TRK, ISCA
            
           | 
          
            13F-HR
           | 
          8/14/2015 | 
          000095012315009254 | 
        
        
          | 
            Q1 2015
           | 
          31 | 
          72,017 | 
          
            
              ALLEGHANY CORP DEL, ISCA, KLIC, BRK-B
            
           | 
          
            13F-HR
           | 
          5/15/2015 | 
          000095012315006285 | 
        
        
          | 
            Q4 2014
           | 
          27 | 
          62,046 | 
          
            
              ALLEGHANY CORP DEL, KLIC, ISCA, TTEK
            
           | 
          
            13F-HR
           | 
          2/17/2015 | 
          000095012315002481 | 
        
        
          | 
            Q3 2014
           | 
          28 | 
          71,168 | 
          
            
              ALLEGHANY CORP DEL, KLIC, TTEK, VOXX
            
           | 
          
            13F-HR
           | 
          11/14/2014 | 
          000095012314011951 | 
        
        
          | 
            Q2 2014
           | 
          30 | 
          70,774 | 
          
            
              ALLEGHANY CORP DEL, KLIC, VOXX, EMC calls
            
           | 
          
            13F-HR
           | 
          8/14/2014 | 
          000095012314008909 | 
        
        
          | 
            Q1 2014
           | 
          28 | 
          61,965 | 
          
            
              ALLEGHANY CORP DEL, KLIC, DDS, EMC calls
            
           | 
          
            13F-HR
           | 
          5/15/2014 | 
          000095012314006116 | 
        
        
          | 
            Q4 2013
           | 
          29 | 
          86,425 | 
          
            
              TTEK, INGR, EMC, ACN
            
           | 
          
            13F-HR
           | 
          2/14/2014 | 
          000095012314002251 |