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BOSTON FINANCIAL MANGEMENT LLC
> CCOI
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 594,389 | -12,320 | 39,996,452,000 | 1,336,956,000 | $67,290.03 |
| 03/31/2023 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 606,709 | -6,160 | 38,659,496,000 | 3,676,946,000 | $63,720.00 |
| 12/31/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 612,869 | 1,732 | 34,982,550,000 | 34,950,673,000 | $57,079.98 |
| 09/30/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 611,137 | 3,280 | 31,877,000 | -5,056,000 | $52.16 |
| 06/30/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 607,857 | 6,161 | 36,933,000 | -2,990,000 | $60.76 |
| 03/31/2022 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 601,696 | -7,332 | 39,923,000 | -4,646,000 | $66.35 |
| 12/31/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 609,028 | 4,468 | 44,569,000 | 1,742,000 | $73.18 |
| 09/30/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 604,560 | 4,859 | 42,827,000 | -3,284,000 | $70.84 |
| 06/30/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 599,701 | 10,635 | 46,111,000 | 5,607,000 | $76.89 |
| 03/31/2021 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 589,066 | 5,098 | 40,504,000 | 5,542,000 | $68.76 |
| 12/31/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 583,968 | -11,802 | 34,962,000 | -814,000 | $59.87 |
| 09/30/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 595,770 | 23,066 | 35,776,000 | -8,528,000 | $60.05 |
| 06/30/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 572,704 | 9,048 | 44,304,000 | -1,899,000 | $77.36 |
| 03/31/2020 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 563,656 | 8,774 | 46,203,000 | 9,686,000 | $81.97 |
| 12/31/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 554,882 | 8,424 | 36,517,000 | 6,407,000 | $65.81 |
| 09/30/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 546,458 | 15,981 | 30,110,000 | -1,379,000 | $55.10 |
| 06/30/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 530,477 | 8,169 | 31,489,000 | 3,154,000 | $59.36 |
| 03/31/2019 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 522,308 | 23,038 | 28,335,000 | 5,763,000 | $54.25 |
| 12/31/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 499,270 | 36,584 | 22,572,000 | -3,246,000 | $45.21 |
| 09/30/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 462,686 | 71,666 | 25,818,000 | 4,938,000 | $55.80 |
| 06/30/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 391,020 | 4,048 | 20,880,000 | 4,085,000 | $53.40 |
| 03/31/2018 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 386,972 | 10,941 | 16,795,000 | -239,000 | $43.40 |
| 12/31/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 376,031 | 16,261 | 17,034,000 | -559,000 | $45.30 |
| 09/30/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 359,770 | 21,123 | 17,593,000 | 4,013,000 | $48.90 |
| 06/30/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 338,647 | 46,246 | 13,580,000 | 992,000 | $40.10 |
| 03/31/2017 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 292,401 | 292,401 | 12,588,000 | 12,588,000 | $43.05 |
| 06/30/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 0 | -133,720 | 0 | -5,219,000 | |
| 03/31/2016 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 133,720 | 133,720 | 5,219,000 | 5,219,000 | $39.03 |
| 12/31/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 113,767 | 42,464 | 3,947,000 | 2,010,000 | $34.69 |
| 09/30/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 71,303 | 71,303 | 1,937,000 | 1,937,000 | $27.17 |
| 06/30/2015 | COGENT COMMUNICATIONS HOLDINGS, INC. | CCOI | 45,200 | 45,200 | 1,530,000 | 1,530,000 | $33.85 |
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