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WILLIAM HARRIS INVESTORS INC
> CCOI
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 0 | -125,210 | 0 | -4,609,000 | |
| 09/30/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 125,210 | -94,913 | 4,609,000 | -4,209,000 | $36.81 |
| 06/30/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 220,123 | 220,123 | 8,818,000 | 8,818,000 | $40.06 |
| 03/31/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 249,748 | 249,748 | 9,748,000 | 9,748,000 | $39.03 |
| 12/31/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 246,492 | 246,492 | 8,551,000 | 8,551,000 | $34.69 |
| 09/30/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 248,197 | 248,197 | 6,741,000 | 6,741,000 | $27.16 |
| 06/30/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 41,651 | 41,651 | 1,409,000 | 1,409,000 | $33.83 |
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