NATURAL GAS SERVICES GROUP

Ticker: NGS CUSIP: 63886Q109 Class: Common Stock

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

InstitutionSharesValue ($000)
DIMENSIONAL FUND ADVISORS LP855,645$28,793
BlackRock, Inc.791,307$26,627
AWM Investment Company, Inc.676,652$22,769
AEGIS FINANCIAL CORP671,112$22,583
VANGUARD GROUP INC640,540$21,554
AMERIPRISE FINANCIAL INC513,625$17,283
WEBER CAPITAL MANAGEMENT LLC /ADV498,581$16,777
ROYCE & ASSOCIATES LP354,816$11,940
Pacific Ridge Capital Partners, LLC345,662$11,632
CANNELL CAPITAL LLC326,252$10,978
First Eagle Investment Management, LLC295,239$9,935
AMERICAN CENTURY COMPANIES INC277,637$9,342
RENAISSANCE TECHNOLOGIES LLC256,442$8,629
GEODE CAPITAL MANAGEMENT, LLC247,201$8,321
BRIDGEWAY CAPITAL MANAGEMENT, LLC213,503$7,184
STATE STREET CORP198,877$6,692
MORGAN STANLEY174,755$5,881
Russell Investments Group, Ltd.166,177$5,592
RBF Capital, LLC140,000$4,711
Mill Road Capital Management LLC109,000$3,668
LPL Financial LLC106,720$3,591
Invesco Ltd.105,842$3,562
Qube Research & Technologies Ltd104,901$3,530
MILLENNIUM MANAGEMENT LLC99,106$3,335
Empowered Funds, LLC96,149$3,235
RAYMOND JAMES FINANCIAL INC93,312$3,140
Bank of New York Mellon Corp92,233$3,104
CITADEL ADVISORS LLC84,643$2,848
NORTHERN TRUST CORP80,238$2,700
CROWN ADVISORS MANAGEMENT, INC.80,000$3
TWO SIGMA INVESTMENTS, LP60,764$2,045
WHITE PINE CAPITAL LLC51,655$1,738
RICE HALL JAMES & ASSOCIATES, LLC44,203$1,487
GOLDMAN SACHS GROUP INC43,722$1,471
Phocas Financial Corp.43,688$1,470
BANK OF AMERICA CORP /DE/38,335$1,290
PRUDENTIAL FINANCIAL INC35,736$1,203
FIRST TRUST ADVISORS LP34,828$1,172
EAM Investors, LLC34,637$1,166
TWO SIGMA ADVISERS, LP32,030$1,078
TrueWealth Advisors, LLC30,869$1,039
CHARLES SCHWAB INVESTMENT MANAGEMENT INC29,872$1,005
JPMORGAN CHASE & CO28,635$964
BNP PARIBAS ARBITRAGE, SA28,352$954
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP27,633$930
SEI INVESTMENTS CO24,485$824
ACADIAN ASSET MANAGEMENT LLC24,393$1
STIFEL FINANCIAL CORP23,096$777
UBS Group AG21,734$731
BARCLAYS PLC21,384$720
Calamos Advisors LLC20,754$698
Trexquant Investment LP19,299$649
Squarepoint Ops LLC17,919$603
PERRITT CAPITAL MANAGEMENT INC17,000$572
Rothschild Wealth LLC17,000$572
Creative Planning16,676$561
Nuveen, LLC15,054$507
BRASADA CAPITAL MANAGEMENT, LP15,000$516
ARTHUR M. COHEN & ASSOCIATES, LLC14,390$484
D. E. Shaw & Co., Inc.14,156$476
PDT Partners, LLC13,994$471
Boston Partners12,735$429
RHUMBLINE ADVISERS12,641$425
SIMPLEX TRADING, LLC12,432$418
WELLS FARGO & COMPANY/MN11,320$381
STATE OF WISCONSIN INVESTMENT BOARD11,116$374
AlphaQuest LLC10,405$350
R Squared Ltd10,099$340
Kestra Advisory Services, LLC10,000$337
Connor, Clark & Lunn Investment Management Ltd.9,659$325
Brandywine Global Investment Management, LLC9,385$316
NEW YORK STATE COMMON RETIREMENT FUND9,078$305
Allspring Global Investments Holdings, LLC9,024$310
DEUTSCHE BANK AG\8,165$275
OCCUDO QUANTITATIVE STRATEGIES LP7,898$266
STRS OHIO7,800$262
HSBC HOLDINGS PLC7,240$244
AQR CAPITAL MANAGEMENT LLC7,092$239
LAZARD ASSET MANAGEMENT LLC7,091$239
FCA CORP /TX7,000$236
OSAIC HOLDINGS, INC.6,818$229
PRICE T ROWE ASSOCIATES INC /MD/6,472$0
State of Wyoming6,227$210
INTECH INVESTMENT MANAGEMENT LLC6,208$209
MANGROVE PARTNERS IM, LLC6,199$209
MetLife Investment Management, LLC6,124$206
FMR LLC5,845$197
Steward Partners Investment Advisory, LLC4,965$167
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.4,745$160
ROYAL BANK OF CANADA4,602$154
Kemnay Advisory Services Inc.3,374$114
CANADA PENSION PLAN INVESTMENT BOARD3,300$111
SG Americas Securities, LLC3,152$0
Police & Firemen's Retirement System of New Jersey2,863$96
CITIGROUP INC2,612$88
LOM Asset Management Ltd1,537$52
Ameritas Investment Partners, Inc.1,051$35
Legal & General Group Plc976$33
State of Alaska, Department of Revenue909$0
ZIONS BANCORPORATION, NATIONAL ASSOCIATION /UT/790$27
31 other institutions6,059$183
Total (131 institutions)9,822,468$326,662