Chang John B. - Insider Stock Trading

Filing Date	T Date	Ticker	Issuer	Inc	Sector	Ind	Industry	Owner	oSt	Rel	Title	T	TVal	Price	Qty	oc	Own	H
11/12/24 16:19	11/12/24	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-183	80.41	-2	-3	70	D
9/13/24 16:45	9/12/24	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-100	71.67	-1	-2	72	D
8/26/24 16:11	8/23/24	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-152	74.00	-2	-3	74	D
12/28/23 09:37	12/26/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-270	76.00	-4	-8	39	D
12/22/23 16:26	12/21/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-74	74.00	-1	-2	43	D
12/15/23 10:23	12/14/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-36	72.00	-1	-1	44	D
5/4/23 12:08	5/3/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-365	73.00	-5	-11	42	D
4/18/23 14:41	4/17/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-35	70.00	-1	-1	47	D
2/2/23 09:31	2/1/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	GC	S	-140	70.00	-2	-4	48	D
1/27/23 09:12	1/26/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	GC	S	-34	68.00	-1	-1	50	D
1/18/23 10:30	1/17/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	GC	S	-66	66.00	-1	-2	50	D
1/13/23 10:25	1/12/23	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	GC	S	-96	64.00	-2	-3	51	D
4/7/22 09:58	4/5/22	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	D		S.m	-36	71.00	-1	-1	41	D
4/4/22 10:22	4/1/22	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	D		S	-10	68.00	0	0	41	D
4/1/22 10:26	3/31/22	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-10	66.00	0	0	42	D
3/18/22 14:01	3/17/22	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-38	62.96	-1	-1	42	D
5/11/21 09:45	5/10/21	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-45	80.00	-1	-2	33	D
5/3/21 09:29	4/30/21	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-42	75.00	-1	-2	33	D
4/6/21 11:13	4/5/21	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-39	70.00	-1	-2	34	D
3/16/21 09:23	3/15/21	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-36	65.00	-1	-2	34	D
1/5/21 13:19	1/4/21	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-33	60.00	-1	-2	25	D
9/1/20 20:39	9/1/20	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-10	67.53	0	-1	26	D
7/31/20 16:52	7/31/20	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-45	90.00	-1	-2	26	D
7/22/20 11:42	7/21/20	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-43	85.00	-1	-2	27	D
3/4/20 16:14	3/3/20	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-49	81.39	-1	-2	27	D
3/3/20 11:38	3/2/20	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-23	76.66	0	-1	28	D
1/3/20 08:41	1/2/20	CCOI	Cogent Communications Holdings, Inc.	DE	Telco	Telco	Communications Services	Chang John B.	DC	O	VP,GC	S	-35	65.46	-1	-3	18	D

D	Derivative transaction in filing (usually option exercise)
M	Multiple transactions in filing; earliest reported transaction date and weighted average transaction price
A	Amended filing
E	Error detected in filing

S - Sale	Sale of securities on an exchange or to another person
S - Sale+OE	Sale of securities on an exchange or to another person (after option exercise)
F - Tax	Payment of exercise price or tax liability using portion of securities received from the company
P - Purchase	Purchase of securities on an exchange or from another person

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