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BLAIR WILLIAM & CO
> CCOI
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 381,460 | -42,782 | 25,668,446,000 | -1,364,284,000 | $67,290.01 |
| 03/31/2023 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 424,242 | -22,377 | 27,032,730,000 | 1,539,690,000 | $63,720.07 |
| 12/31/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 446,619 | -41,883 | 25,493,040,000 | 25,467,560,000 | $57,080.06 |
| 09/30/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 488,502 | 63,213 | 25,480,000 | -361,000 | $52.16 |
| 06/30/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 425,289 | -21,641 | 25,841,000 | -3,813,000 | $60.76 |
| 03/31/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 446,930 | -626 | 29,654,000 | -3,098,000 | $66.35 |
| 12/31/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 447,556 | 21,647 | 32,752,000 | 2,581,000 | $73.18 |
| 09/30/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 425,909 | 85,551 | 30,171,000 | 4,001,000 | $70.84 |
| 06/30/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 340,358 | 62,595 | 26,170,000 | 9,540,000 | $76.89 |
| 12/31/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 277,763 | 64,195 | 16,630,000 | 3,805,000 | $59.87 |
| 09/30/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 213,568 | 53,190 | 12,825,000 | 418,000 | $60.05 |
| 06/30/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 160,378 | 6,487 | 12,407,000 | -207,000 | $77.36 |
| 03/31/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 153,891 | -25,233 | 12,614,000 | 826,000 | $81.97 |
| 12/31/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 179,124 | 2,852 | 11,788,000 | 2,075,000 | $65.81 |
| 09/30/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 176,272 | -2,854 | 9,713,000 | -920,000 | $55.10 |
| 06/30/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 179,126 | -2,109 | 10,633,000 | 801,000 | $59.36 |
| 03/31/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 181,235 | 4,424 | 9,832,000 | 1,838,000 | $54.25 |
| 12/31/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 176,811 | 2,368 | 7,994,000 | -1,740,000 | $45.21 |
| 09/30/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 174,443 | -100 | 9,734,000 | 413,000 | $55.80 |
| 06/30/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 174,543 | 8,953 | 9,321,000 | 2,134,000 | $53.40 |
| 03/31/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 165,590 | 2,235 | 7,187,000 | -213,000 | $43.40 |
| 12/31/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 163,355 | -4,418 | 7,400,000 | -804,000 | $45.30 |
| 09/30/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 167,773 | 14,788 | 8,204,000 | 2,069,000 | $48.90 |
| 06/30/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 152,985 | 1,763 | 6,135,000 | -133,000 | $40.10 |
| 03/31/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 151,222 | 1,825 | 6,268,000 | 90,000 | $41.45 |
| 12/31/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 149,397 | -7,450 | 6,178,000 | 404,000 | $41.35 |
| 09/30/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 156,847 | 11,562 | 5,774,000 | -46,000 | $36.81 |
| 06/30/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 145,285 | 145,285 | 5,820,000 | 5,820,000 | $40.06 |
| 03/31/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 148,510 | 43,385 | 5,796,000 | 2,837,000 | $39.03 |
| 12/31/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 149,460 | 44,335 | 5,184,000 | 2,225,000 | $34.68 |
| 09/30/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 162,510 | 57,385 | 4,413,000 | 1,454,000 | $27.16 |
| 06/30/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 141,800 | 36,675 | 4,798,000 | 1,839,000 | $33.84 |
| 03/31/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 130,294 | 25,169 | 4,603,000 | 1,644,000 | $35.33 |
| 12/31/2014 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 129,819 | 24,694 | 4,594,000 | 1,635,000 | $35.39 |
| 09/30/2014 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 106,129 | 1,004 | 3,566,000 | 607,000 | $33.60 |
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