TREX CO INC

Ticker: TREX CUSIP: 89531P105 Class: Common Stock

GILDER GAGNON HOWE & CO LLC's Holding History (CIK: 0000902464)

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

Q1 2015

Shares 706 Value ($000) $38 Avg Close $11.54 Range $9.51 - $13.78

Q3 2014

Shares 191,771 Value ($000) $6,630 Avg Close $8.38 Range $6.29 - $9.87

Q2 2014

Shares 464,610 Value ($000) $13,390 Avg Close $8.47 Range $7.07 - $10.13

Q1 2014

Shares 312,034 Value ($000) $22,828 Avg Close $8.95 Range $7.76 - $10.86

Q4 2013

Shares 368,687 Value ($000) $29,322 Avg Close $8.18 Range $5.78 - $10.38

Q3 2013

Shares 375,280 Value ($000) $18,588 Avg Close $5.82 Range $5.16 - $6.51

Q2 2013

Shares 337,692 Value ($000) $16,036,993 Avg Close $6.43 Range $5.66 - $7.25

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2015	706	$38	$11.54	$9.51 - $13.78
Q3 2014	191,771	$6,630	$8.38	$6.29 - $9.87
Q2 2014	464,610	$13,390	$8.47	$7.07 - $10.13
Q1 2014	312,034	$22,828	$8.95	$7.76 - $10.86
Q4 2013	368,687	$29,322	$8.18	$5.78 - $10.38
Q3 2013	375,280	$18,588	$5.82	$5.16 - $6.51
Q2 2013	337,692	$16,036,993	$6.43	$5.66 - $7.25