Cogent Communications Holdings, Inc.

De Sa Paul bought 3,445 shares of CCOI on 30 June. They now own 33,792 CCOI shares.

Montagner Marc bought 3,445 shares of CCOI on 30 June. They now own 99,842 CCOI shares.

Howell Deneen C bought 3,445 shares of CCOI on 30 June. They now own 32,330 CCOI shares.

Kennedy Sheryl Lynn bought 3,445 shares of CCOI on 30 June. They now own 13,690 CCOI shares.

Howard Eve N bought 3,445 shares of CCOI on 30 June. They now own 27,306 CCOI shares.

Ferguson Lewis H bought 3,445 shares of CCOI on 30 June. They now own 24,539 CCOI shares.

Brooks Steven D bought 3,445 shares of CCOI on 30 June. They now own 58,693 CCOI shares.

Weed Thaddeus Gerard sold 4,850 shares of CCOI on 16 June. They now own 197,900 CCOI shares.

Kilmer Henry W sold 2,400 shares of CCOI on 15 June. They now own 38,600 CCOI shares.

Ferguson Lewis H sold 2,800 shares of CCOI on 28 May. They now own 21,094 CCOI shares.

Kennedy Sheryl Lynn sold 3,300 shares of CCOI on 14 May. They now own 10,245 CCOI shares.

Schaeffer Dave sold 1,000,000 shares of CCOI on 4 May. They now own 609,143 CCOI shares.

Schaeffer Dave bought 1,000,000 shares of CCOI on 4 May. They now own 1,258,990 CCOI shares.

Schaeffer Dave bought 1,000,000 shares of CCOI on 4 May. They now own 1,609,143 CCOI shares.

Schaeffer Dave bought 29,333 shares of CCOI on 1 April. They now own 258,990 CCOI shares.

Schaeffer Dave sold 58,667 shares of CCOI on 1 April. They now own 638,476 CCOI shares.

Schaeffer Dave sold 29,333 shares of CCOI on 1 April. They now own 609,143 CCOI shares.

Montagner Marc bought 3,445 shares of CCOI on 31 March. They now own 96,397 CCOI shares.

Howard Eve N bought 3,445 shares of CCOI on 31 March. They now own 23,861 CCOI shares.

Kennedy Sheryl Lynn bought 3,445 shares of CCOI on 31 March. They now own 13,545 CCOI shares.

Howell Deneen C bought 3,445 shares of CCOI on 31 March. They now own 28,885 CCOI shares.

De Sa Paul bought 3,445 shares of CCOI on 31 March. They now own 30,347 CCOI shares.

Ferguson Lewis H bought 3,445 shares of CCOI on 31 March. They now own 23,894 CCOI shares.

Brooks Steven D bought 3,445 shares of CCOI on 31 March. They now own 55,248 CCOI shares.

Kilmer Henry W sold 2,400 shares of CCOI on 6 March. They now own 41,000 CCOI shares.

Weed Thaddeus Gerard sold 4,850 shares of CCOI on 5 March. They now own 202,750 CCOI shares.

Kennedy Sheryl Lynn sold 3,300 shares of CCOI on 5 March. They now own 10,100 CCOI shares.

Ferguson Lewis H sold 2,206 shares of CCOI on 5 March. They now own 20,449 CCOI shares.

De Sa Paul bought 3,388 shares of CCOI on 31 December. They now own 26,902 CCOI shares.

Kilmer Henry W bought 9,600 shares of CCOI on 31 December. They now own 43,400 CCOI shares.

Weed Thaddeus Gerard bought 100,000 shares of CCOI on 31 December. They now own 207,600 CCOI shares.

Schaeffer Dave bought 229,657 shares of CCOI on 31 December. They now own 926,800 CCOI shares.

Brooks Steven D bought 3,388 shares of CCOI on 31 December. They now own 51,803 CCOI shares.

Kennedy Sheryl Lynn bought 3,388 shares of CCOI on 31 December. They now own 13,400 CCOI shares.

Harris Mark Andrew bought 5,000 shares of CCOI on 31 December. They now own 10,168 CCOI shares.

Harris Mark Andrew bought 100,000 shares of CCOI on 31 December. They now own 110,168 CCOI shares.

Chang John B. bought 9,600 shares of CCOI on 31 December. They now own 88,847 CCOI shares.

Howard Eve N bought 3,388 shares of CCOI on 31 December. They now own 20,416 CCOI shares.

Montagner Marc bought 3,388 shares of CCOI on 31 December. They now own 92,952 CCOI shares.

Schaeffer Dave bought 229,657 shares of CCOI on 31 December. They now own 229,657 CCOI shares.

Chang John B. bought 100,000 shares of CCOI on 31 December. They now own 188,847 CCOI shares.

Ferguson Lewis H bought 3,388 shares of CCOI on 31 December. They now own 22,655 CCOI shares.

Howell Deneen C bought 3,388 shares of CCOI on 31 December. They now own 25,440 CCOI shares.

Weed Thaddeus Gerard bought 19,400 shares of CCOI on 31 December. They now own 107,600 CCOI shares.

Schaeffer Dave sold 229,657 shares of CCOI on 31 December. They now own 697,143 CCOI shares.

Weed Thaddeus Gerard sold 7,300 shares of CCOI on 11 December. They now own 88,200 CCOI shares.

Kilmer Henry W sold 4,800 shares of CCOI on 8 December. They now own 33,800 CCOI shares.

Ferguson Lewis H sold 4,000 shares of CCOI on 2 December. They now own 19,267 CCOI shares.

Chang John B. bought 2,400 shares of CCOI on 1 December. They now own 79,247 CCOI shares.

Kilmer Henry W bought 2,400 shares of CCOI on 1 December. They now own 38,600 CCOI shares.

Weed Thaddeus Gerard bought 2,400 shares of CCOI on 1 December. They now own 95,500 CCOI shares.

Kennedy Sheryl Lynn sold 2,400 shares of CCOI on 11 November. They now own 10,012 CCOI shares.

Montagner Marc bought 2,395 shares of CCOI on 30 September. They now own 89,564 CCOI shares.

Brooks Steven D bought 2,395 shares of CCOI on 30 September. They now own 48,415 CCOI shares.

Kennedy Sheryl Lynn bought 2,395 shares of CCOI on 30 September. They now own 12,412 CCOI shares.

Ferguson Lewis H bought 2,395 shares of CCOI on 30 September. They now own 23,267 CCOI shares.

Howell Deneen C bought 2,395 shares of CCOI on 30 September. They now own 22,052 CCOI shares.

De Sa Paul bought 2,395 shares of CCOI on 30 September. They now own 23,514 CCOI shares.

Howard Eve N bought 2,395 shares of CCOI on 30 September. They now own 17,028 CCOI shares.

Kilmer Henry W sold 2,400 shares of CCOI on 5 September. They now own 36,200 CCOI shares.

Harris Mark Andrew bought 0 shares of CCOI on 2 September. They now own 4,500 CCOI shares.

Harris Mark Andrew bought 668 shares of CCOI on 2 September. They now own 5,168 CCOI shares.

Weed Thaddeus Gerard sold 4,900 shares of CCOI on 2 September. They now own 93,100 CCOI shares.

Kennedy Sheryl Lynn sold 2,000 shares of CCOI on 21 August. They now own 10,017 CCOI shares.

Schaeffer Dave sold 818,909 shares of CCOI on 8 August. They now own 697,143 CCOI shares.

Schaeffer Dave sold 1,840,669 shares of CCOI on 7 August. They now own 1,516,052 CCOI shares.

Ferguson Lewis H bought 1,968 shares of CCOI on 30 June. They now own 20,872 CCOI shares.

Howell Deneen C bought 1,968 shares of CCOI on 30 June. They now own 19,657 CCOI shares.

Kennedy Sheryl Lynn bought 1,968 shares of CCOI on 30 June. They now own 12,017 CCOI shares.

De Sa Paul bought 1,968 shares of CCOI on 30 June. They now own 21,119 CCOI shares.

Howard Eve N bought 1,968 shares of CCOI on 30 June. They now own 14,633 CCOI shares.

Montagner Marc bought 1,968 shares of CCOI on 30 June. They now own 87,169 CCOI shares.

Brooks Steven D bought 1,968 shares of CCOI on 30 June. They now own 46,020 CCOI shares.

Schaeffer Dave sold 45,000 shares of CCOI on 16 June. They now own 3,381,721 CCOI shares.

Schaeffer Dave sold 25,000 shares of CCOI on 16 June. They now own 3,356,721 CCOI shares.

Schaeffer Dave sold 45,000 shares of CCOI on 13 June. They now own 3,436,721 CCOI shares.

Schaeffer Dave sold 10,000 shares of CCOI on 13 June. They now own 3,426,721 CCOI shares.

Schaeffer Dave sold 45,000 shares of CCOI on 12 June. They now own 3,491,721 CCOI shares.

Schaeffer Dave sold 10,000 shares of CCOI on 12 June. They now own 3,481,721 CCOI shares.

Schaeffer Dave sold 10,000 shares of CCOI on 11 June. They now own 3,536,721 CCOI shares.

Schaeffer Dave sold 45,000 shares of CCOI on 11 June. They now own 3,546,721 CCOI shares.

Schaeffer Dave sold 15,000 shares of CCOI on 10 June. They now own 3,591,721 CCOI shares.

Schaeffer Dave sold 40,000 shares of CCOI on 10 June. They now own 3,606,721 CCOI shares.

Schaeffer Dave sold 40,000 shares of CCOI on 9 June. They now own 3,661,721 CCOI shares.

Schaeffer Dave sold 15,000 shares of CCOI on 9 June. They now own 3,646,721 CCOI shares.

Weed Thaddeus Gerard sold 4,900 shares of CCOI on 9 June. They now own 98,000 CCOI shares.

Schaeffer Dave sold 30,000 shares of CCOI on 6 June. They now own 3,701,721 CCOI shares.

Schaeffer Dave sold 50,000 shares of CCOI on 6 June. They now own 3,731,721 CCOI shares.

Kilmer Henry W sold 2,400 shares of CCOI on 6 June. They now own 38,600 CCOI shares.

Schaeffer Dave sold 35,000 shares of CCOI on 5 June. They now own 3,781,721 CCOI shares.

Schaeffer Dave sold 40,000 shares of CCOI on 5 June. They now own 3,816,721 CCOI shares.

Schaeffer Dave sold 25,000 shares of CCOI on 4 June. They now own 3,856,721 CCOI shares.

Bubeck James sold 2,000 shares of CCOI on 4 June. They now own 55,142 CCOI shares.

Schaeffer Dave sold 50,000 shares of CCOI on 4 June. They now own 3,881,721 CCOI shares.

Schaeffer Dave sold 15,000 shares of CCOI on 3 June. They now own 3,931,721 CCOI shares.

Schaeffer Dave sold 50,000 shares of CCOI on 3 June. They now own 3,946,721 CCOI shares.

Schaeffer Dave sold 50,000 shares of CCOI on 2 June. They now own 4,011,721 CCOI shares.

Chang John B. sold 398 shares of CCOI on 2 June. They now own 76,847 CCOI shares.

Schaeffer Dave sold 15,000 shares of CCOI on 2 June. They now own 3,996,721 CCOI shares.

Schaeffer Dave sold 25,000 shares of CCOI on 30 May. They now own 4,061,721 CCOI shares.

Schaeffer Dave sold 25,000 shares of CCOI on 29 May. They now own 4,086,721 CCOI shares.

Weed Thaddeus Gerard sold 100 shares of CCOI on 28 May. They now own 102,900 CCOI shares.

Schaeffer Dave sold 20,000 shares of CCOI on 28 May. They now own 4,111,721 CCOI shares.

Ferguson Lewis H sold 1,100 shares of CCOI on 28 May. They now own 18,904 CCOI shares.

Schaeffer Dave sold 20,000 shares of CCOI on 27 May. They now own 4,131,721 CCOI shares.

Schaeffer Dave sold 25,000 shares of CCOI on 23 May. They now own 4,151,721 CCOI shares.

Schaeffer Dave sold 25,000 shares of CCOI on 22 May. They now own 4,176,721 CCOI shares.

Schaeffer Dave sold 40,000 shares of CCOI on 21 May. They now own 4,201,721 CCOI shares.

Schaeffer Dave sold 15,000 shares of CCOI on 20 May. They now own 4,241,721 CCOI shares.

Schaeffer Dave sold 15,000 shares of CCOI on 16 May. They now own 4,256,721 CCOI shares.

Weed Thaddeus Gerard sold 0 shares of CCOI on 16 May. They now own 103,000 CCOI shares.

Weed Thaddeus Gerard sold 100 shares of CCOI on 16 May. They now own 102,900 CCOI shares.

Schaeffer Dave sold 40,000 shares of CCOI on 15 May. They now own 4,271,721 CCOI shares.

Schaeffer Dave sold 30,000 shares of CCOI on 14 May. They now own 4,311,721 CCOI shares.

Chang John B. bought 504 shares of CCOI on 13 May. They now own 3,089 CCOI shares.

Kennedy Sheryl Lynn sold 1,450 shares of CCOI on 13 May. They now own 10,049 CCOI shares.

Schaeffer Dave sold 42,628 shares of CCOI on 13 May. They now own 4,341,721 CCOI shares.

Chang John B. sold 756 shares of CCOI on 13 May. They now own 77,245 CCOI shares.

Schaeffer Dave sold 11,372 shares of CCOI on 12 May. They now own 4,384,349 CCOI shares.

Schaeffer Dave sold 48,317 shares of CCOI on 4 April. They now own 4,395,721 CCOI shares.

Brooks Steven D bought 1,352 shares of CCOI on 31 March. They now own 44,052 CCOI shares.

Howell Deneen C bought 1,352 shares of CCOI on 31 March. They now own 17,689 CCOI shares.

Howard Eve N bought 1,352 shares of CCOI on 31 March. They now own 12,665 CCOI shares.

Bath Blake bought 1,352 shares of CCOI on 31 March. They now own 12,606 CCOI shares.

Montagner Marc bought 1,352 shares of CCOI on 31 March. They now own 85,201 CCOI shares.

Kennedy Sheryl Lynn bought 1,352 shares of CCOI on 31 March. They now own 11,499 CCOI shares.

De Sa Paul bought 1,352 shares of CCOI on 31 March. They now own 19,151 CCOI shares.

Ferguson Lewis H bought 1,352 shares of CCOI on 31 March. They now own 20,004 CCOI shares.

Ferguson Lewis H sold 956 shares of CCOI on 12 March. They now own 18,652 CCOI shares.

Chang John B. sold 357 shares of CCOI on 10 March. They now own 78,358 CCOI shares.

Kilmer Henry W sold 2,400 shares of CCOI on 7 March. They now own 41,000 CCOI shares.

Chang John B. bought 715 shares of CCOI on 5 March. They now own 2,585 CCOI shares.

Chang John B. sold 715 shares of CCOI on 5 March. They now own 78,715 CCOI shares.

Bubeck James sold 2,000 shares of CCOI on 4 March. They now own 57,142 CCOI shares.

Schaeffer Dave sold 60,000 shares of CCOI on 4 March. They now own 4,444,038 CCOI shares.

Weed Thaddeus Gerard sold 4,900 shares of CCOI on 3 March. They now own 103,000 CCOI shares.

Kennedy Sheryl Lynn sold 1,425 shares of CCOI on 3 March. They now own 10,147 CCOI shares.

Brooks Steven D sold 299 shares of CCOI on 21 January. They now own 42,700 CCOI shares.

Schaeffer Dave bought 96,000 shares of CCOI on 14 January. They now own 4,504,038 CCOI shares.

Schaeffer Dave bought 84,000 shares of CCOI on 14 January. They now own 4,408,038 CCOI shares.

Kilmer Henry W bought 9,600 shares of CCOI on 9 January. They now own 43,400 CCOI shares.

Weed Thaddeus Gerard bought 19,400 shares of CCOI on 9 January. They now own 107,900 CCOI shares.

Chang John B. bought 9,600 shares of CCOI on 9 January. They now own 79,430 CCOI shares.

Bubeck James bought 9,600 shares of CCOI on 9 January. They now own 59,142 CCOI shares.

Montagner Marc bought 1,254 shares of CCOI on 1 January. They now own 83,849 CCOI shares.

Howard Eve N bought 1,254 shares of CCOI on 1 January. They now own 11,313 CCOI shares.

Ferguson Lewis H bought 1,254 shares of CCOI on 1 January. They now own 19,608 CCOI shares.

Bath Blake bought 1,254 shares of CCOI on 1 January. They now own 11,254 CCOI shares.

De Sa Paul bought 1,254 shares of CCOI on 1 January. They now own 17,799 CCOI shares.

Brooks Steven D bought 1,254 shares of CCOI on 1 January. They now own 42,999 CCOI shares.

Howell Deneen C bought 1,254 shares of CCOI on 1 January. They now own 16,337 CCOI shares.

Kennedy Sheryl Lynn bought 1,254 shares of CCOI on 1 January. They now own 11,572 CCOI shares.

Chang John B. sold 970 shares of CCOI on 18 December. They now own 69,830 CCOI shares.

Chang John B. bought 485 shares of CCOI on 18 December. They now own 935 CCOI shares.

Schaeffer Dave sold 20,000 shares of CCOI on 16 December. They now own 4,228,038 CCOI shares.

Kilmer Henry W sold 4,800 shares of CCOI on 12 December. They now own 33,800 CCOI shares.

Bubeck James sold 1,920 shares of CCOI on 9 December. They now own 49,542 CCOI shares.

Chang John B. sold 900 shares of CCOI on 4 December. They now own 70,800 CCOI shares.

Weed Thaddeus Gerard sold 4,800 shares of CCOI on 2 December. They now own 88,500 CCOI shares.

Bubeck James sold 1,920 shares of CCOI on 2 December. They now own 51,462 CCOI shares.

Kilmer Henry W bought 2,400 shares of CCOI on 1 December. They now own 38,600 CCOI shares.

Chang John B. bought 2,400 shares of CCOI on 1 December. They now own 71,700 CCOI shares.

Bubeck James bought 2,400 shares of CCOI on 1 December. They now own 53,382 CCOI shares.

Weed Thaddeus Gerard bought 2,400 shares of CCOI on 1 December. They now own 93,300 CCOI shares.

Kilmer Henry W bought 2,400 shares of CCOI on 1 December. They now own 38,600 CCOI shares.

Schaeffer Dave sold 24,364 shares of CCOI on 26 November. They now own 4,248,038 CCOI shares.

Schaeffer Dave sold 35,636 shares of CCOI on 25 November. They now own 4,272,402 CCOI shares.

Bath Blake sold 6,220 shares of CCOI on 21 November. They now own 10,000 CCOI shares.

Ferguson Lewis H sold 846 shares of CCOI on 18 November. They now own 18,354 CCOI shares.

Chang John B. sold 2,280 shares of CCOI on 12 November. They now own 69,300 CCOI shares.

Howard Eve N sold 3,500 shares of CCOI on 11 November. They now own 10,059 CCOI shares.

Kennedy Sheryl Lynn sold 1,350 shares of CCOI on 11 November. They now own 10,318 CCOI shares.

Montagner Marc bought 1,452 shares of CCOI on 1 October. They now own 82,595 CCOI shares.

Ferguson Lewis H bought 1,452 shares of CCOI on 1 October. They now own 19,200 CCOI shares.

Brooks Steven D bought 1,452 shares of CCOI on 1 October. They now own 42,045 CCOI shares.

Bath Blake bought 1,452 shares of CCOI on 1 October. They now own 16,220 CCOI shares.

De Sa Paul bought 1,452 shares of CCOI on 1 October. They now own 16,545 CCOI shares.

Kennedy Sheryl Lynn bought 1,452 shares of CCOI on 1 October. They now own 11,668 CCOI shares.

Howard Eve N bought 1,452 shares of CCOI on 1 October. They now own 13,559 CCOI shares.

Brooks Steven D bought 1,452 shares of CCOI on 1 October. They now own 41,745 CCOI shares.

Howell Deneen C bought 1,452 shares of CCOI on 1 October. They now own 15,083 CCOI shares.

Chang John B. sold 1,400 shares of CCOI on 12 September. They now own 71,580 CCOI shares.

Kennedy Sheryl Lynn sold 1,550 shares of CCOI on 10 September. They now own 10,216 CCOI shares.

Schaeffer Dave sold 65,000 shares of CCOI on 10 September. They now own 4,308,038 CCOI shares.

Kilmer Henry W sold 2,400 shares of CCOI on 4 September. They now own 36,200 CCOI shares.

Bubeck James sold 1,920 shares of CCOI on 4 September. They now own 50,982 CCOI shares.

Weed Thaddeus Gerard sold 2,400 shares of CCOI on 3 September. They now own 90,900 CCOI shares.

Schaeffer Dave sold 60,000 shares of CCOI on 27 August. They now own 4,373,038 CCOI shares.

Chang John B. sold 2,055 shares of CCOI on 23 August. They now own 72,980 CCOI shares.

Ferguson Lewis H sold 1,550 shares of CCOI on 22 August. They now own 17,748 CCOI shares.

Bath Blake bought 1,675 shares of CCOI on 1 July. They now own 14,768 CCOI shares.

Howard Eve N bought 1,675 shares of CCOI on 1 July. They now own 12,107 CCOI shares.

Ferguson Lewis H bought 1,675 shares of CCOI on 1 July. They now own 19,298 CCOI shares.

Howell Deneen C bought 1,675 shares of CCOI on 1 July. They now own 13,631 CCOI shares.

Montagner Marc bought 1,675 shares of CCOI on 1 July. They now own 81,143 CCOI shares.

De Sa Paul bought 1,675 shares of CCOI on 1 July. They now own 15,093 CCOI shares.

Kennedy Sheryl Lynn bought 1,675 shares of CCOI on 1 July. They now own 11,766 CCOI shares.

Brooks Steven D bought 1,675 shares of CCOI on 1 July. They now own 40,593 CCOI shares.

Schaeffer Dave sold 60,000 shares of CCOI on 14 June. They now own 4,433,038 CCOI shares.

Schaeffer Dave sold 60,000 shares of CCOI on 12 June. They now own 4,493,038 CCOI shares.