COGENT COMMUNICATIONS HLDGS

Ticker: CCOI CUSIP: 19239V302 Class: Common Stock

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

Note: Option positions (PUT/CALL) are excluded.

Q2 2016

Shares 359,509 Value ($000) $14,402 Avg Close $24.32 Range $22.65 - $26.11

Q1 2016

Shares 366,459 Value ($000) $14,303 Avg Close $21.23 Range $18.11 - $24.16

Q4 2015

Shares 352,500 Value ($000) $12,228 Avg Close $19.64 Range $15.90 - $22.21

Q3 2014

Shares 221,022 Value ($000) $7,853 Avg Close $19.66 Range $18.35 - $21.27

Q2 2014

Shares 128,672 Value ($000) $4,446 Avg Close $20.24 Range $18.87 - $21.66

Q1 2014

Shares 221,022 Value ($000) $7,853 Avg Close $22.15 Range $17.84 - $24.59

Q4 2013

Shares 217,231 Value ($000) $8,778 Avg Close $20.46 Range $17.72 - $23.32

Q2 2013

Shares 144,325 Value ($000) $4,063 Avg Close $15.51 Range $14.03 - $16.52

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2016	359,509	$14,402	$24.32	$22.65 - $26.11
Q1 2016	366,459	$14,303	$21.23	$18.11 - $24.16
Q4 2015	352,500	$12,228	$19.64	$15.90 - $22.21
Q3 2014	221,022	$7,853	$19.66	$18.35 - $21.27
Q2 2014	128,672	$4,446	$20.24	$18.87 - $21.66
Q1 2014	221,022	$7,853	$22.15	$17.84 - $24.59
Q4 2013	217,231	$8,778	$20.46	$17.72 - $23.32
Q2 2013	144,325	$4,063	$15.51	$14.03 - $16.52