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General | Insiders | Insider Transactions | Monthly Overview | Weekly Overview

Overview of all insider trading transactions in COGENT COMMUNICATIONS HOLDINGS, INC.. Get notifications about new insider transactions in COGENT COMMUNICATIONS HOLDINGS, INC. for free.

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Date	Ticker	Company	Owner	Relationship	Transaction	Code	Cost ($)	Shares	Transaction Value ($)	Total Shares	% Holdings
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.74	684	13,505	7,106	7.8 K to 7.1 K (-8.78 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.74	80,590	1,591,233	836,609	917.2 K to 836.6 K (-8.79 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.74	1,676	33,092	17,390	19.1 K to 17.4 K (-8.79 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.74	4,596	90,747	47,710	52.3 K to 47.7 K (-8.79 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.74	59,787	1,180,482	620,644	680.4 K to 620.6 K (-8.79 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.11	1,944	39,095	22,137	24.1 K to 22.1 K (-8.07 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.11	723	14,540	8,226	8.9 K to 8.2 K (-8.08 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.11	684	13,756	7,790	8.5 K to 7.8 K (-8.07 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.11	80,590	1,620,713	917,199	997.8 K to 917.2 K (-8.08 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.11	1,676	33,705	19,066	20.7 K to 19.1 K (-8.08 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.11	4,596	92,428	52,306	56.9 K to 52.3 K (-8.08 %)
Jan 22 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.11	59,787	1,202,352	680,431	740.2 K to 680.4 K (-8.08 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.40	1,944	39,667	24,081	26 K to 24.1 K (-7.47 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.40	723	14,753	8,949	9.7 K to 8.9 K (-7.48 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.40	684	13,957	8,474	9.2 K to 8.5 K (-7.47 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.40	80,590	1,644,407	997,789	1.1 M to 997.8 K (-7.47 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.40	1,676	34,198	20,742	22.4 K to 20.7 K (-7.48 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.40	4,596	93,780	56,902	61.5 K to 56.9 K (-7.47 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.40	59,787	1,219,930	740,218	800 K to 740.2 K (-7.47 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.38	1,944	39,623	26,025	28 K to 26 K (-6.95 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.38	723	14,736	9,672	10.4 K to 9.7 K (-6.96 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.38	684	13,941	9,158	9.8 K to 9.2 K (-6.95 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.38	80,590	1,642,585	1,078,379	1.2 M to 1.1 M (-6.95 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.38	1,676	34,160	22,418	24.1 K to 22.4 K (-6.96 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.38	4,596	93,676	61,498	66.1 K to 61.5 K (-6.95 %)
Jan 18 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.38	59,787	1,218,579	800,005	859.8 K to 800 K (-6.95 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.35	1,944	39,557	27,969	29.9 K to 28 K (-6.50 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.35	723	14,712	10,395	11.1 K to 10.4 K (-6.50 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.35	684	13,918	9,842	10.5 K to 9.8 K (-6.50 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.35	80,590	1,639,869	1,158,969	1.2 M to 1.2 M (-6.50 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.35	1,676	34,104	24,094	25.8 K to 24.1 K (-6.50 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.35	4,596	93,521	66,094	70.7 K to 66.1 K (-6.50 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	20.35	59,787	1,216,564	859,792	919.6 K to 859.8 K (-6.50 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.51	1,296	25,282	29,913	31.2 K to 29.9 K (-4.15 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	18.34	648	11,886	31,209	31.9 K to 31.2 K (-2.03 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.51	482	9,403	11,118	11.6 K to 11.1 K (-4.16 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	18.34	241	4,420	11,600	11.8 K to 11.6 K (-2.04 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.51	456	8,896	10,526	11 K to 10.5 K (-4.15 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	18.34	228	4,182	10,982	11.2 K to 11 K (-2.03 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.51	53,727	1,048,096	1,239,559	1.3 M to 1.2 M (-4.15 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	18.34	26,864	492,748	1,293,286	1.3 M to 1.3 M (-2.03 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.51	1,117	21,790	25,770	26.9 K to 25.8 K (-4.15 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	18.34	559	10,253	26,887	27.4 K to 26.9 K (-2.04 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.51	3,064	59,772	70,690	73.8 K to 70.7 K (-4.15 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	18.34	1,532	28,100	73,754	75.3 K to 73.8 K (-2.03 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	19.51	39,858	777,542	919,579	959.4 K to 919.6 K (-4.15 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	18.34	19,928	365,525	959,437	979.4 K to 959.4 K (-2.03 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Option Exercise	M	6.00	4,000	24,000	278,119
Jan 16 2007	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	20.33	4,000	81,325	10,000	14 K to 10 K (-28.57 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Buy	M	6.00	4,000	24,000	14,000	10 K to 14 K (+40.00 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	ONEILL TIMOTHY G	VP Field Engineerin ...	Option Exercise	M	0.00	2,000	0	11,462
Jan 16 2007	COI	COGENT COMMUNICATI ...	ONEILL TIMOTHY G	VP Field Engineerin ...	Sell	S	20.06	2,000	40,120	10,000	12 K to 10 K (-16.67 %)
Jan 16 2007	COI	COGENT COMMUNICATI ...	ONEILL TIMOTHY G	VP Field Engineerin ...	Buy	M	0.00	2,000	0	12,000	10 K to 12 K (+20.00 %)
Jan 10 2007	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Grant	A	0.00	7,500	0	12,150	19.7 K to 12.2 K (-38.17 %)
Jan 10 2007	COI	COGENT COMMUNICATI ...	GLASSMEYER EDWARD F	Director	Grant	A	0.00	7,500	0	11,250	3.8 K to 11.3 K (+200.00 %)
Jan 10 2007	COI	COGENT COMMUNICATI ...	BROOKS STEVEN D	Director	Grant	A	0.00	7,500	0	1,224,025	1.2 M to 1.2 M (+0.62 %)
Jan 10 2007	COI	COGENT COMMUNICATI ...	BERTRAND JEAN JACQUES	Director	Grant	A	0.00	7,500	0	10,357	2.9 K to 10.4 K (+262.51 %)
Jan 09 2007	COI	COGENT COMMUNICATI ...	PETERSON KENNETH D JR	Director	Grant	A	0.00	7,500	0	11,250	3.8 K to 11.3 K (+200.00 %)
Jan 09 2007	COI	COGENT COMMUNICATI ...	LIEBHABER RICHARD	Director	Grant	A	0.00	5,625	0	6,710	1.1 K to 6.7 K (+518.43 %)
Jan 09 2007	COI	COGENT COMMUNICATI ...	Bath Blake	Director	Grant	A	0.00	625	0	625	0 to 625
Jan 04 2007	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Option Exercise	M	6.00	4,000	24,000	282,119
Jan 04 2007	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	16.57	4,000	66,274	10,000	14 K to 10 K (-28.57 %)
Jan 04 2007	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Buy	M	6.00	4,000	24,000	14,000	10 K to 14 K (+40.00 %)
Jan 04 2007	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Option Exercise	M	0.00	280	0	4,765
Jan 04 2007	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Sell	S	16.01	280	4,481	20,000	20.3 K to 20 K (-1.38 %)
Jan 04 2007	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Buy	M	0.00	280	0	20,280	20 K to 20.3 K (+1.40 %)
Jan 04 2007	COI	COGENT COMMUNICATI ...	BEURY ROBERT N JR	Chief Legal Officer	Option Exercise	M	0.00	400	0	9,029
Jan 04 2007	COI	COGENT COMMUNICATI ...	BEURY ROBERT N JR	Chief Legal Officer	Sell	S	16.44	400	6,576	10,000	10.4 K to 10 K (-3.85 %)
Jan 04 2007	COI	COGENT COMMUNICATI ...	BEURY ROBERT N JR	Chief Legal Officer	Sell	M	0.00	400	0	10,400	10.8 K to 10.4 K (-3.70 %)
Dec 21 2006	COI	COGENT COMMUNICATI ...	SCHLEIFER MARK A	VP of IP Engineerin ...	Option Exercise	M	0.00	600	0	3,815
Dec 21 2006	COI	COGENT COMMUNICATI ...	SCHLEIFER MARK A	VP of IP Engineerin ...	Sell	S	15.55	600	9,330	10,000	10.6 K to 10 K (-5.66 %)
Dec 21 2006	COI	COGENT COMMUNICATI ...	SCHLEIFER MARK A	VP of IP Engineerin ...	Buy	M	0.00	600	0	10,600	10 K to 10.6 K (+6.00 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Option Exercise	M	6.00	4,000	24,000	286,119
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.80	200	3,160	10,000	10.2 K to 10 K (-1.96 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.77	100	1,577	10,200	10.3 K to 10.2 K (-0.97 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.76	200	3,152	10,300	10.5 K to 10.3 K (-1.90 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.69	48	753	10,500	10.5 K to 10.5 K (-0.46 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.68	200	3,136	10,548	10.7 K to 10.5 K (-1.86 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.67	300	4,701	10,748	11 K to 10.7 K (-2.72 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.66	100	1,566	11,048	11.1 K to 11 K (-0.90 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.65	3	47	11,148	11.2 K to 11.1 K (-0.03 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.64	797	12,465	11,151	11.9 K to 11.2 K (-6.67 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.63	52	813	11,948	12 K to 11.9 K (-0.43 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.62	100	1,562	12,000	12.1 K to 12 K (-0.83 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.61	200	3,122	12,100	12.3 K to 12.1 K (-1.63 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.60	81	1,264	12,300	12.4 K to 12.3 K (-0.65 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.59	281	4,381	12,381	12.7 K to 12.4 K (-2.22 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.58	38	592	12,662	12.7 K to 12.7 K (-0.30 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.55	300	4,665	12,700	13 K to 12.7 K (-2.31 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.54	200	3,108	13,000	13.2 K to 13 K (-1.52 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.53	600	9,318	13,200	13.8 K to 13.2 K (-4.35 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.52	200	3,104	13,800	14 K to 13.8 K (-1.43 %)
Dec 18 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Buy	M	6.00	4,000	24,000	14,000	10 K to 14 K (+40.00 %)
Dec 15 2006	COI	COGENT COMMUNICATI ...	GLASSMEYER EDWARD F	Director	Sell	J	0.00	25,468	0	0	25.5 K to 0 (-100.00 %)
Dec 15 2006	COI	COGENT COMMUNICATI ...	GLASSMEYER EDWARD F	Director	Sell	J	0.00	11,550	0	0	11.6 K to 0 (-100.00 %)
Dec 15 2006	COI	COGENT COMMUNICATI ...	GLASSMEYER EDWARD F	Director	Sell	J	0.00	852,973	0	0	853 K to 0 (-100.00 %)
Dec 15 2006	COI	COGENT COMMUNICATI ...	Karnes Jeffrey	VP Sales & CRO	Sell	S	15.65	1,200	18,782	22,017	23.2 K to 22 K (-5.17 %)
Dec 15 2006	COI	COGENT COMMUNICATI ...	LIEBHABER RICHARD	Director	Buy	J	0.00	1,085	0	1,085	0 to 1.1 K
Dec 11 2006	COI	COGENT COMMUNICATI ...	GLASSMEYER EDWARD F	Director	Sell	J	0.00	31,477	0	25,468	56.9 K to 25.5 K (-55.28 %)
Dec 11 2006	COI	COGENT COMMUNICATI ...	GLASSMEYER EDWARD F	Director	Sell	J	0.00	14,275	0	11,550	25.8 K to 11.6 K (-55.28 %)
Dec 11 2006	COI	COGENT COMMUNICATI ...	GLASSMEYER EDWARD F	Director	Sell	J	0.00	1,054,248	0	852,973	1.9 M to 853 K (-55.28 %)
Dec 04 2006	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Option Exercise	M	0.00	367	0	5,045
Dec 04 2006	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Sell	S	15.81	367	5,801	20,000	20.4 K to 20 K (-1.80 %)
Dec 04 2006	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Buy	M	0.00	367	0	20,367	20 K to 20.4 K (+1.84 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Option Exercise	M	6.00	4,000	24,000	290,119
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.83	300	4,749	10,000	10.3 K to 10 K (-2.91 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.82	100	1,582	10,300	10.4 K to 10.3 K (-0.96 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.80	400	6,320	10,400	10.8 K to 10.4 K (-3.70 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.72	349	5,486	10,800	11.1 K to 10.8 K (-3.13 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.71	351	5,514	11,149	11.5 K to 11.1 K (-3.05 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.68	300	4,704	11,500	11.8 K to 11.5 K (-2.54 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.67	1,000	15,670	11,800	12.8 K to 11.8 K (-7.81 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.54	300	4,662	12,800	13.1 K to 12.8 K (-2.29 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.52	200	3,104	13,100	13.3 K to 13.1 K (-1.50 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.51	100	1,551	13,300	13.4 K to 13.3 K (-0.75 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.44	15	232	13,400	13.4 K to 13.4 K (-0.11 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.43	185	2,855	13,415	13.6 K to 13.4 K (-1.36 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.42	200	3,084	13,600	13.8 K to 13.6 K (-1.45 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.41	200	3,082	13,800	14 K to 13.8 K (-1.43 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Buy	M	0.00	4,000	0	14,000	10 K to 14 K (+40.00 %)
Dec 01 2006	COI	COGENT COMMUNICATI ...	SCHAEFFER DAVE	Chairman & CEO	Sell	S	15.30	500,000	7,650,000	855,410	1.4 M to 855.4 K (-36.89 %)
Nov 28 2006	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Option Exercise	M	4.88	3,125	15,250	6,875
Nov 28 2006	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Sell	S	16.19	3,125	50,599	20,000	23.1 K to 20 K (-13.51 %)
Nov 28 2006	COI	COGENT COMMUNICATI ...	WEED THADDEUS GERARD	VP, CFO	Buy	M	4.88	3,125	15,250	23,125	20 K to 23.1 K (+15.63 %)
Nov 17 2006	COI	COGENT COMMUNICATI ...	BERTRAND JEAN JACQUES	Director	Sell	S	14.64	553	8,096	2,857	3.4 K to 2.9 K (-16.22 %)
Nov 17 2006	COI	COGENT COMMUNICATI ...	BERTRAND JEAN JACQUES	Director	Sell	S	14.64	209,255	3,063,493	0	209.3 K to 0 (-100.00 %)
Nov 17 2006	COI	COGENT COMMUNICATI ...	BERTRAND JEAN JACQUES	Director	Sell	S	14.64	790,192	11,568,411	2,850,860	3.6 M to 2.9 M (-21.70 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	14.64	20,743	303,678	31,857	52.6 K to 31.9 K (-39.44 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	14.64	7,710	112,874	11,841	19.6 K to 11.8 K (-39.44 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	14.64	7,300	106,872	11,210	18.5 K to 11.2 K (-39.44 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	14.64	859,629	12,584,969	1,320,150	2.2 M to 1.3 M (-39.44 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	14.64	17,872	261,646	27,446	45.3 K to 27.4 K (-39.44 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	14.64	49,023	717,697	75,286	124.3 K to 75.3 K (-39.44 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	MARGALIT EREL N	Director	Sell	S	14.64	637,723	9,336,265	979,365	1.6 M to 979.4 K (-39.44 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	WEINGARTEN TIM	Director	Sell	S	14.64	63,801	934,047	63,944	127.7 K to 63.9 K (-49.94 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	WEINGARTEN TIM	Director	Sell	S	14.64	3,259	47,712	3,267	6.5 K to 3.3 K (-49.94 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	WEINGARTEN TIM	Director	Sell	S	14.64	391,205	5,727,241	392,086	783.3 K to 392.1 K (-49.94 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	WEINGARTEN TIM	Director	Sell	S	14.64	39,086	572,219	39,174	78.3 K to 39.2 K (-49.94 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	WEINGARTEN TIM	Director	Sell	S	14.64	15,725	230,214	15,760	31.5 K to 15.8 K (-49.94 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	WEINGARTEN TIM	Director	Sell	S	14.64	175,377	2,567,519	175,772	351.1 K to 175.8 K (-49.94 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	WEINGARTEN TIM	Director	Sell	S	14.64	711,547	10,417,048	713,149	1.4 M to 713.1 K (-49.94 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	BROOKS STEVEN D	Director	Sell	S	14.64	950,000	13,908,000	1,216,525	2.2 M to 1.2 M (-43.85 %)
Nov 16 2006	COI	COGENT COMMUNICATI ...	Karnes Jeffrey	VP Sales & CRO	Sell	S	15.96	1,200	19,151	23,217	24.4 K to 23.2 K (-4.91 %)
Nov 15 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Option Exercise	M	6.00	4,000	24,000	294,119
Nov 15 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	16.12	100	1,612	10,000	10.1 K to 10 K (-0.99 %)
Nov 15 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	16.01	600	9,606	10,100	10.7 K to 10.1 K (-5.61 %)
Nov 15 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.98	200	3,196	10,700	10.9 K to 10.7 K (-1.83 %)
Nov 15 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.93	100	1,593	10,900	11 K to 10.9 K (-0.91 %)
Nov 15 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.92	450	7,164	11,000	11.5 K to 11 K (-3.93 %)
Nov 15 2006	COI	COGENT COMMUNICATI ...	Harrison R Reed	President & COO	Sell	S	15.90	1,050	16,695	11,450	12.5 K to 11.5 K (-8.40 %)

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