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FRONTIER CAPITAL MANAGEMENT CO LLC
> CCOI
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 1,256,479 | -1,599,429 | 56,918,499 | -61,173,297 | $45.30 |
| 12/31/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 2,855,908 | -1,378,696 | 118,091,796 | 58,214,495 | $41.35 |
| 12/31/2010 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 4,234,604 | 4,234,604 | 59,877,301 | 59,877,301 | $14.14 |
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