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EMERALD ADVISERS, LLC
> CCOI
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2023 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 240,186 | -10,483 | 15,304,652,000 | 15,289,421,000 | $63,720.00 |
| 06/30/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 250,669 | -11,530 | 15,231,000 | -2,166,000 | $60.76 |
| 03/31/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 262,199 | 26,561 | 17,397,000 | 153,000 | $66.35 |
| 12/31/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 235,638 | -16,902 | 17,244,000 | -646,000 | $73.18 |
| 09/30/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 252,540 | -45,313 | 17,890,000 | -5,012,000 | $70.84 |
| 06/30/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 297,853 | -39,785 | 22,902,000 | 2,688,000 | $76.89 |
| 12/31/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 337,638 | 29 | 20,214,000 | -59,000 | $59.87 |
| 09/30/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 337,609 | -16,460 | 20,273,000 | -7,118,000 | $60.05 |
| 06/30/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 354,069 | -59,309 | 27,391,000 | -6,494,000 | $77.36 |
| 03/31/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 413,378 | 57,946 | 33,885,000 | 10,494,000 | $81.97 |
| 12/31/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 355,432 | 37,569 | 23,391,000 | 5,877,000 | $65.81 |
| 09/30/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 317,863 | -27,319 | 17,514,000 | -2,976,000 | $55.10 |
| 06/30/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 345,182 | -4,070 | 20,490,000 | 1,543,000 | $59.36 |
| 03/31/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 349,252 | -8,069 | 18,947,000 | 2,793,000 | $54.25 |
| 12/31/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 357,321 | 56,514 | 16,154,000 | -631,000 | $45.21 |
| 09/30/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 300,807 | -9,890 | 16,785,000 | 194,000 | $55.80 |
| 06/30/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 310,697 | -3,490 | 16,591,000 | 2,955,000 | $53.40 |
| 03/31/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 314,187 | -5,514 | 13,636,000 | -846,000 | $43.40 |
| 12/31/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 319,701 | -163,661 | 14,482,000 | -9,154,000 | $45.30 |
| 09/30/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 483,362 | -89,376 | 23,636,000 | 669,000 | $48.90 |
| 06/30/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 572,738 | -32,750 | 22,967,000 | -3,099,000 | $40.10 |
| 03/31/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 605,488 | -31,079 | 26,066,000 | -256,000 | $43.05 |
| 12/31/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 636,567 | 397,750 | 26,322,000 | 17,531,000 | $41.35 |
| 09/30/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 238,817 | 238,817 | 8,791,000 | 8,791,000 | $36.81 |
| 03/31/2008 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 0 | -205,741 | 0 | -4,878,000 | |
| 12/31/2007 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 205,741 | 205,741 | 4,878,000 | 4,878,000 | $23.71 |
| 09/30/2007 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 226,501 | 226,501 | 5,287,000 | 5,287,000 | $23.34 |
| 06/30/2007 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 260,810 | 260,810 | 7,790,000 | 7,790,000 | $29.87 |
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