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        Signature
      
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        /s/ Paul J. Angelico
      
      
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        Stock symbol
      
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        CEMI
      
      
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        Transactions as of
      
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        Oct 28, 2022
      
      
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        Transactions value $
      
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        -$36,888
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        5/2/2023, 04:39 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | CEMI | Common Stock | Options Exercise |  | +10.6K | +29.53% |  | 46.5K | Oct 28, 2022 | Direct | F1 | 
          
            | transaction | CEMI | Common Stock | Tax liability | -$1.22K | -3.82K | -8.23% | $0.32 | 42.7K | Oct 28, 2022 | Direct | F2 | 
          
            | transaction | CEMI | Common Stock | Options Exercise |  | +29.3K | +68.78% |  | 72K | Mar 11, 2023 | Direct | F1 | 
          
            | transaction | CEMI | Common Stock | Tax liability | -$4.65K | -10.6K | -14.69% | $0.44 | 61.4K | Mar 11, 2023 | Direct | F2 | 
          
            | transaction | CEMI | Common Stock | Options Exercise |  | +7.89K | +12.84% |  | 69.3K | Mar 15, 2023 | Direct | F1 | 
          
            | transaction | CEMI | Common Stock | Tax liability | -$1.11K | -2.84K | -4.1% | $0.39 | 66.5K | Mar 15, 2023 | Direct | F2 | 
          
            | transaction | CEMI | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -$29.9K | -66.5K | -100% | $0.45 | 0 | Apr 26, 2023 | Direct | F3 | 
      
    
   
  
    Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes | 
      
      
          
            | transaction | CEMI | Restricted stock units | Options Exercise | $0 | -10.6K | -100% | $0.00* | 0 | Oct 28, 2022 | Common stock | 10.6K |  | Direct | F1, F4 | 
          
            | transaction | CEMI | Restricted stock units | Options Exercise | $0 | -29.3K | -33.33% | $0.00 | 58.7K | Mar 11, 2023 | Common stock | 29.3K |  | Direct | F1, F5 | 
          
            | transaction | CEMI | Restricted stock units | Options Exercise | $0 | -7.89K | -50% | $0.00 | 7.89K | Mar 15, 2023 | Common stock | 7.89K |  | Direct | F1, F6 | 
          
            | transaction | CEMI | Restricted stock units | Disposed to Issuer |  | -66.6K | -100% |  | 0 | Apr 27, 2023 | Common stock | 66.6K |  | Direct | F1, F7 | 
          
            | transaction | CEMI | Incentive stock options | Disposed to Issuer |  | -29.9K | -100% |  | 0 | Apr 27, 2023 | Common stock | 29.9K | $2.36 | Direct | F8 | 
          
            | transaction | CEMI | Incentive stock options | Disposed to Issuer |  | -177K | -100% |  | 0 | Apr 27, 2023 | Common stock | 177K | $4.65 | Direct | F8 | 
          
            | transaction | CEMI | Incentive stock options | Disposed to Issuer |  | -170K | -100% |  | 0 | Apr 27, 2023 | Common stock | 170K | $1.25 | Direct | F8 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  Paul Angelico is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.
  
    Explanation of Responses: