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NEW AMSTERDAM PARTNERS LLC
> MKSI
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2019 | MKS INSTRUMENTS INC | MKSI | 0 | -3,125 | 0 | -202,000 | |
| 12/31/2018 | MKS INSTRUMENTS INC | MKSI | 3,125 | -55,656 | 202,000 | -4,509,000 | $64.64 |
| 09/30/2018 | MKS INSTRUMENTS INC | MKSI | 58,781 | 5,844 | 4,711,000 | -355,000 | $80.14 |
| 06/30/2018 | MKS INSTRUMENTS INC | MKSI | 52,937 | 2,502 | 5,066,000 | -767,000 | $95.70 |
| 03/31/2018 | MKS INSTRUMENTS INC | MKSI | 50,435 | 50,435 | 5,833,000 | 5,833,000 | $115.65 |
| 12/31/2015 | MKS INSTRUMENTS INC | MKSI | 0 | -67,267 | 0 | -2,255,000 | |
| 09/30/2015 | MKS INSTRUMENTS INC | MKSI | 67,267 | 1,391 | 2,255,000 | -244,000 | $33.52 |
| 06/30/2015 | MKS INSTRUMENTS INC | MKSI | 65,876 | 65,876 | 2,499,000 | 2,499,000 | $37.93 |
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