NATURAL GAS SERVICES GROUP

Ticker: NGS CUSIP: 63886Q109 Class: Common Stock

AltraVue Capital, LLC's Holding History (CIK: 0001740837)

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

Q4 2020

Shares 464,454 Value ($000) $4,403 Avg Close $9.94 Range $8.27 - $12.10

Q3 2020

Shares 449,239 Value ($000) $3,796 Avg Close $7.49 Range $6.05 - $10.02

Q2 2020

Shares 228,798 Value ($000) $1,435 Avg Close $5.74 Range $3.96 - $8.23

Q1 2020

Shares 200,218 Value ($000) $893 Avg Close $9.28 Range $2.59 - $13.00

Q4 2019

Shares 308,886 Value ($000) $3,787 Avg Close $11.66 Range $10.44 - $12.91

Q3 2019

Shares 311,486 Value ($000) $3,990 Avg Close $13.56 Range $10.11 - $16.51

Q2 2019

Shares 280,996 Value ($000) $4,637 Avg Close $16.22 Range $14.71 - $18.54

Q1 2019

Shares 247,139 Value ($000) $4,278 Avg Close $17.65 Range $15.90 - $19.02

Q4 2018

Shares 229,099 Value ($000) $3,766 Avg Close $18.94 Range $15.26 - $20.99

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2020	464,454	$4,403	$9.94	$8.27 - $12.10
Q3 2020	449,239	$3,796	$7.49	$6.05 - $10.02
Q2 2020	228,798	$1,435	$5.74	$3.96 - $8.23
Q1 2020	200,218	$893	$9.28	$2.59 - $13.00
Q4 2019	308,886	$3,787	$11.66	$10.44 - $12.91
Q3 2019	311,486	$3,990	$13.56	$10.11 - $16.51
Q2 2019	280,996	$4,637	$16.22	$14.71 - $18.54
Q1 2019	247,139	$4,278	$17.65	$15.90 - $19.02
Q4 2018	229,099	$3,766	$18.94	$15.26 - $20.99