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Century Capital Management, LLC
> PRLB
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2017 | Proto Labs Inc | PRLB | 0 | -44,316 | 0 | -2,265,000 | |
| 03/31/2017 | Proto Labs Inc | PRLB | 44,316 | -68,036 | 2,265,000 | -3,504,000 | $51.11 |
| 12/31/2016 | Proto Labs Inc | PRLB | 112,352 | -8,031 | 5,769,000 | -1,443,000 | $51.35 |
| 09/30/2016 | Proto Labs Inc | PRLB | 120,383 | -65,885 | 7,212,000 | -7,147,000 | $59.91 |
| 06/30/2016 | Proto Labs Inc | PRLB | 122,499 | -63,769 | 7,051,000 | -7,308,000 | $57.56 |
| 03/31/2016 | Proto Labs Inc | PRLB | 186,268 | 186,268 | 14,359,000 | 14,359,000 | $77.09 |
| 12/31/2015 | Proto Labs Inc | PRLB | 180,712 | 28,264 | 11,510,000 | 1,296,000 | $63.69 |
| 09/30/2015 | Proto Labs Inc | PRLB | 152,448 | 71,709 | 10,214,000 | 4,766,000 | $67.00 |
| 06/30/2015 | Proto Labs Inc | PRLB | 80,739 | -1,546 | 5,448,000 | -312,000 | $67.48 |
| 03/31/2015 | Proto Labs Inc | PRLB | 82,285 | 82,285 | 5,760,000 | 5,760,000 | $70.00 |
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