NATURAL GAS SERVICES GROUP

Institution	Shares	Value ($000)
Phocas Financial Corp.	43,688	$1,470
EAM Investors, LLC	34,637	$1,166
BRASADA CAPITAL MANAGEMENT, LP	15,000	$516
Rothschild Wealth LLC	17,000	$572
FCA CORP /TX	7,000	$236
OCCUDO QUANTITATIVE STRATEGIES LP	7,898	$266
MANGROVE PARTNERS IM, LLC	6,199	$209
Kemnay Advisory Services Inc.	3,374	$114
Trexquant Investment LP	19,299	$649
LPL Financial LLC	106,720	$3,591
Calamos Advisors LLC	20,754	$698
PRUDENTIAL FINANCIAL INC	35,736	$1,203
SEI INVESTMENTS CO	24,485	$824
INTECH INVESTMENT MANAGEMENT LLC	6,208	$209
STATE OF WISCONSIN INVESTMENT BOARD	11,116	$374
Connor, Clark & Lunn Investment Management Ltd.	9,659	$325
SIMPLEX TRADING, LLC	12,432	$418
D. E. Shaw & Co., Inc.	14,156	$476
HSBC HOLDINGS PLC	7,240	$244
AQR CAPITAL MANAGEMENT LLC	7,092	$239

Increased Positions (45)

CROWN ADVISORS MANAGEMENT, INC.

Value ($000) $3 (+37.4%) Shares 80,000 (+14.3%)

PERRITT CAPITAL MANAGEMENT INC

Value ($000) $572 (+36.3%) Shares 17,000 (+13.3%)

ARTHUR M. COHEN & ASSOCIATES, LLC

Value ($000) $484 (+121.8%) Shares 14,390 (+84.5%)

R Squared Ltd

Value ($000) $340 (+39.6%) Shares 10,099 (+16.1%)

Invesco Ltd.

Value ($000) $3,562 (+531.2%) Shares 105,842 (+425.0%)

CITADEL ADVISORS LLC

Value ($000) $2,848 (+1121.0%) Shares 84,643 (+915.6%)

AMERICAN CENTURY COMPANIES INC

Value ($000) $9,342 (+47.3%) Shares 277,637 (+22.5%)

Bank of New York Mellon Corp

Value ($000) $3,104 (+252.0%) Shares 92,233 (+192.8%)

Russell Investments Group, Ltd.

Value ($000) $5,592 (+45.6%) Shares 166,177 (+21.1%)

TWO SIGMA INVESTMENTS, LP

Value ($000) $2,045 (+76.3%) Shares 60,764 (+46.6%)

MORGAN STANLEY

Value ($000) $5,881 (+47.3%) Shares 174,755 (+22.5%)

BlackRock, Inc.

Value ($000) $26,627 (+24.9%) Shares 791,307 (+3.9%)

VANGUARD GROUP INC

Value ($000) $21,554 (+25.9%) Shares 640,540 (+4.7%)

Qube Research & Technologies Ltd

Value ($000) $3,530 (+33.8%) Shares 104,901 (+11.3%)

BANK OF AMERICA CORP /DE/

Value ($000) $1,290 (+85.5%) Shares 38,335 (+54.3%)

BNP PARIBAS ARBITRAGE, SA

Value ($000) $954 (+102.9%) Shares 28,352 (+68.8%)

STIFEL FINANCIAL CORP

Value ($000) $777 (+95.9%) Shares 23,096 (+62.9%)

GEODE CAPITAL MANAGEMENT, LLC

Value ($000) $8,321 (+24.4%) Shares 247,201 (+3.5%)

NEW YORK STATE COMMON RETIREMENT FUND

Value ($000) $305 (+252.1%) Shares 9,078 (+192.8%)

Steward Partners Investment Advisory, LLC

Value ($000) $167 (+547.0%) Shares 4,965 (+437.9%)

Institution	Prev Shares	Curr Shares	Change
CROWN ADVISORS MANAGEMENT, INC.	70,000	80,000	+10,000 (+14.3%)
PERRITT CAPITAL MANAGEMENT INC	15,000	17,000	+2,000 (+13.3%)
ARTHUR M. COHEN & ASSOCIATES, LLC	7,800	14,390	+6,590 (+84.5%)
R Squared Ltd	8,699	10,099	+1,400 (+16.1%)
Invesco Ltd.	20,160	105,842	+85,682 (+425.0%)
CITADEL ADVISORS LLC	8,334	84,643	+76,309 (+915.6%)
AMERICAN CENTURY COMPANIES INC	226,658	277,637	+50,979 (+22.5%)
Bank of New York Mellon Corp	31,503	92,233	+60,730 (+192.8%)
Russell Investments Group, Ltd.	137,237	166,177	+28,940 (+21.1%)
TWO SIGMA INVESTMENTS, LP	41,439	60,764	+19,325 (+46.6%)
MORGAN STANLEY	142,648	174,755	+32,107 (+22.5%)
BlackRock, Inc.	761,628	791,307	+29,679 (+3.9%)
VANGUARD GROUP INC	611,653	640,540	+28,887 (+4.7%)
Qube Research & Technologies Ltd	94,239	104,901	+10,662 (+11.3%)
BANK OF AMERICA CORP /DE/	24,847	38,335	+13,488 (+54.3%)
BNP PARIBAS ARBITRAGE, SA	16,800	28,352	+11,552 (+68.8%)
STIFEL FINANCIAL CORP	14,176	23,096	+8,920 (+62.9%)
GEODE CAPITAL MANAGEMENT, LLC	238,897	247,201	+8,304 (+3.5%)
NEW YORK STATE COMMON RETIREMENT FUND	3,100	9,078	+5,978 (+192.8%)
Steward Partners Investment Advisory, LLC	923	4,965	+4,042 (+437.9%)

Decreased Positions (29)

Mill Road Capital Management LLC

Value ($000) $3,668 (-67.6%) Shares 109,000 (-73.1%)

CANNELL CAPITAL LLC

Value ($000) $10,978 (+9.2%) Shares 326,252 (-9.1%)

Pacific Ridge Capital Partners, LLC

Value ($000) $11,632 (+6.2%) Shares 345,662 (-11.7%)

BRIDGEWAY CAPITAL MANAGEMENT, LLC

Value ($000) $7,184 (+9.9%) Shares 213,503 (-8.6%)

WHITE PINE CAPITAL LLC

Value ($000) $1,738 (+17.8%) Shares 51,655 (-2.0%)

State of Wyoming

Value ($000) $210 (-19.6%) Shares 6,227 (-33.1%)

AlphaQuest LLC

Value ($000) $350 (-16.0%) Shares 10,405 (-30.1%)

RENAISSANCE TECHNOLOGIES LLC

Value ($000) $8,629 (+2.4%) Shares 256,442 (-14.8%)

MILLENNIUM MANAGEMENT LLC

Value ($000) $3,335 (-29.5%) Shares 99,106 (-41.4%)

ROYCE & ASSOCIATES LP

Value ($000) $11,940 (+18.0%) Shares 354,816 (-1.9%)

UBS Group AG

Value ($000) $731 (-64.4%) Shares 21,734 (-70.4%)

Squarepoint Ops LLC

Value ($000) $603 (-29.8%) Shares 17,919 (-41.6%)

PDT Partners, LLC

Value ($000) $471 (+8.9%) Shares 13,994 (-9.4%)

NORTHERN TRUST CORP

Value ($000) $2,700 (+9.2%) Shares 80,238 (-9.2%)

First Eagle Investment Management, LLC

Value ($000) $9,935 (+18.4%) Shares 295,239 (-1.5%)

LAZARD ASSET MANAGEMENT LLC

Value ($000) $239 (-23.4%) Shares 7,091 (-36.3%)

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

Value ($000) $930 (+6.8%) Shares 27,633 (-11.2%)

Boston Partners

Value ($000) $429 (-4.9%) Shares 12,735 (-20.9%)

RHUMBLINE ADVISERS

Value ($000) $425 (+0.3%) Shares 12,641 (-16.6%)

JPMORGAN CHASE & CO

Value ($000) $964 (+10.3%) Shares 28,635 (-8.2%)

Institution	Prev Shares	Curr Shares	Change
Mill Road Capital Management LLC	404,745	109,000	-295,745 (-73.1%)
CANNELL CAPITAL LLC	359,021	326,252	-32,769 (-9.1%)
Pacific Ridge Capital Partners, LLC	391,287	345,662	-45,625 (-11.7%)
BRIDGEWAY CAPITAL MANAGEMENT, LLC	233,503	213,503	-20,000 (-8.6%)
WHITE PINE CAPITAL LLC	52,702	51,655	-1,047 (-2.0%)
State of Wyoming	9,313	6,227	-3,086 (-33.1%)
AlphaQuest LLC	14,891	10,405	-4,486 (-30.1%)
RENAISSANCE TECHNOLOGIES LLC	300,942	256,442	-44,500 (-14.8%)
MILLENNIUM MANAGEMENT LLC	169,023	99,106	-69,917 (-41.4%)
ROYCE & ASSOCIATES LP	361,571	354,816	-6,755 (-1.9%)
UBS Group AG	73,303	21,734	-51,569 (-70.4%)
Squarepoint Ops LLC	30,704	17,919	-12,785 (-41.6%)
PDT Partners, LLC	15,452	13,994	-1,458 (-9.4%)
NORTHERN TRUST CORP	88,324	80,238	-8,086 (-9.2%)
First Eagle Investment Management, LLC	299,739	295,239	-4,500 (-1.5%)
LAZARD ASSET MANAGEMENT LLC	11,129	7,091	-4,038 (-36.3%)
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	31,115	27,633	-3,482 (-11.2%)
Boston Partners	16,105	12,735	-3,370 (-20.9%)
RHUMBLINE ADVISERS	15,159	12,641	-2,518 (-16.6%)
JPMORGAN CHASE & CO	31,197	28,635	-2,562 (-8.2%)

Exited Positions (10)

Acuitas Investments, LLC

Value ($000) $6,065 Shares 216,700

Inspire Investing, LLC

Value ($000) $1,094 Shares 39,094

Inspire Advisors, LLC

Value ($000) $323 Shares 11,539

ExodusPoint Capital Management, LP

Value ($000) $395 Shares 14,105

JACOBS LEVY EQUITY MANAGEMENT, INC

Value ($000) $641 Shares 22,915

nVerses Capital, LLC

Value ($000) $10 Shares 500

JANE STREET GROUP, LLC

Value ($000) $483 Shares 17,254

MACQUARIE GROUP LTD

Value ($000) $18 Shares 650

SRS Capital Advisors, Inc.

Value ($000) $1 Shares 31

True Wealth Design, LLC

Value ($000) $0 Shares 1

Institution	Prev Shares	Prev Value ($000)
Acuitas Investments, LLC	216,700	$6,065
Inspire Investing, LLC	39,094	$1,094
Inspire Advisors, LLC	11,539	$323
ExodusPoint Capital Management, LP	14,105	$395
JACOBS LEVY EQUITY MANAGEMENT, INC	22,915	$641
nVerses Capital, LLC	500	$10
JANE STREET GROUP, LLC	17,254	$483
MACQUARIE GROUP LTD	650	$18
SRS Capital Advisors, Inc.	31	$1
True Wealth Design, LLC	1	$0