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                    Closing price on 5/13/2021
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        |           
                
                    | Open | 3.30 |  
                    | High | 3.40 |  
                    | Low | 3.20 |  
                    | Volume | 1,792,900 |  
                    | Split-adjusted Price | 3.40 |  
                
             | 
 |  ACM Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 5/13/2021 | 0.00 / 0.00% | 3.30 | 3.40 | 3.20 | 3.40 | 3.31 | 3.40 | 1,792,900 |   |  
            | 5/12/2021 | 0.00 / 0.00% | 3.40 | 3.40 | 3.20 | 3.40 | 3.32 | 3.40 | 1,238,100 |   |  			
            | 5/11/2021 | -0.10 / -2.86% | 3.50 | 3.60 | 3.30 | 3.40 | 3.42 | 3.40 | 962,100 |   |  
            | 5/10/2021 | +0.30 / +9.38% | 3.20 | 3.50 | 2.90 | 3.50 | 3.23 | 3.50 | 2,430,700 |   |  			
            | 5/7/2021 | -0.30 / -8.57% | 3.40 | 3.40 | 3.20 | 3.20 | 3.24 | 3.20 | 3,015,400 |   |  
            | 5/6/2021 | -0.20 / -5.41% | 3.70 | 3.70 | 3.40 | 3.50 | 3.48 | 3.50 | 2,250,400 |   |  			
            | 5/5/2021 | +0.20 / +5.71% | 3.50 | 3.70 | 3.30 | 3.70 | 3.60 | 3.70 | 1,820,500 |   |  
            | 5/4/2021 | -0.30 / -7.89% | 3.60 | 3.80 | 3.50 | 3.50 | 3.51 | 3.50 | 3,646,400 |   |  			
            | 4/29/2021 | +0.20 / +5.56% | 3.90 | 3.90 | 3.70 | 3.80 | 3.82 | 3.80 | 5,812,300 |   |  
            | 4/28/2021 | +0.30 / +9.09% | 3.30 | 3.60 | 3.30 | 3.60 | 3.59 | 3.60 | 885,800 |   |  			
            | 4/27/2021 | +0.30 / +10.00% | 3.00 | 3.30 | 2.70 | 3.30 | 3.06 | 3.30 | 2,169,500 |   |  
            | 4/26/2021 | -0.30 / -9.09% | 3.30 | 3.30 | 3.00 | 3.00 | 3.03 | 3.00 | 4,925,000 |   |  			
            | 4/23/2021 | -0.30 / -8.33% | 3.50 | 3.50 | 3.30 | 3.30 | 3.31 | 3.30 | 3,758,800 |   |  
            | 4/22/2021 | -0.30 / -7.69% | 3.80 | 3.90 | 3.60 | 3.60 | 3.66 | 3.60 | 3,034,500 |   |  			
            | 4/20/2021 | -0.10 / -2.50% | 3.60 | 4.30 | 3.60 | 3.90 | 3.70 | 3.90 | 7,454,200 |   |  
            | 4/19/2021 | -0.40 / -9.09% | 4.30 | 4.40 | 4.00 | 4.00 | 4.01 | 4.00 | 1,349,900 |   |  			
            | 4/16/2021 | -0.40 / -8.33% | 4.90 | 5.20 | 4.40 | 4.40 | 4.62 | 4.40 | 8,655,700 |   |  
            | 4/15/2021 | +0.40 / +9.09% | 4.50 | 4.80 | 4.50 | 4.80 | 4.77 | 4.80 | 3,126,100 |   |  			
            | 4/14/2021 | +0.40 / +10.00% | 4.10 | 4.40 | 3.60 | 4.40 | 4.08 | 4.40 | 5,274,300 |   |  
            | 4/13/2021 | +0.10 / +2.56% | 4.00 | 4.20 | 3.60 | 4.00 | 4.08 | 4.00 | 12,200,100 |   |  			
            | 4/12/2021 | +0.30 / +8.33% | 3.80 | 3.90 | 3.70 | 3.90 | 3.89 | 3.90 | 1,710,000 |   |  
            | 4/9/2021 | +0.30 / +9.09% | 3.50 | 3.60 | 3.30 | 3.60 | 3.58 | 3.60 | 2,822,800 |   |  			
            | 4/8/2021 | +0.30 / +10.00% | 3.30 | 3.30 | 2.80 | 3.30 | 3.23 | 3.30 | 14,993,900 |   |  
            | 4/7/2021 | +0.20 / +7.14% | 3.00 | 3.00 | 2.90 | 3.00 | 3.00 | 3.00 | 2,196,800 |   |  			
            | 4/6/2021 | +0.20 / +7.69% | 2.70 | 2.80 | 2.70 | 2.80 | 2.80 | 2.80 | 1,989,300 |   |  
            | 4/5/2021 | +0.20 / +8.33% | 2.50 | 2.60 | 2.30 | 2.60 | 2.56 | 2.60 | 4,753,700 |   |  			
            | 4/2/2021 | +0.20 / +9.09% | 2.30 | 2.40 | 2.10 | 2.40 | 2.26 | 2.40 | 7,029,900 |   |  
            | 4/1/2021 | +0.20 / +10.00% | 2.10 | 2.20 | 1.90 | 2.20 | 2.10 | 2.20 | 5,464,300 |   |  			
            | 3/31/2021 | +0.10 / +5.26% | 2.00 | 2.00 | 1.90 | 2.00 | 2.00 | 2.00 | 1,691,900 |   |  
            | 3/30/2021 | +0.10 / +5.56% | 1.90 | 1.90 | 1.80 | 1.90 | 1.90 | 1.90 | 3,655,700 |   |  |  |