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Institutional Ownership · SEC Form 13F

Who owns Natural Gas Services Group (NGS)


Which tracked institutional funds hold NGS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See NGS company fundamentals →

Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.

154
Institutional holders
11M
Shares held (tracked funds)
86.2%
Of shares outstanding

How the tape is positioned

51 tracked funds added or opened NGS while 19 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.

A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.

Conviction spread

NGS’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes NGS more heavily than its largest holder by dollar value does.

Book-share is each fund’s reported value in NGS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.

Institutional & insider positioning

Between 2026-Q1 and 2026-Q2, across 154 tracked filers holding NGS, 92 increased or opened the position and 59 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.

This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.

New buyers & exits

Funds opening or closing a position in NGS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.

New buyers 5

  • NORGES BANK$3M
  • XTX Topco Ltd$2M
  • NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$1M
  • Dynamic Technology Lab Private Ltd$689K
  • OneDigital Investment Advisors LLC$644K

Full exits 5

  • JANE STREET GROUP, LLC$3M
  • SIMPLEX TRADING, LLC$1M
  • Assenagon Asset Management S.A.$818K
  • ACADIAN ASSET MANAGEMENT LLC$628K
  • GSA CAPITAL PARTNERS LLP$575K

Largest adds

  • BlackRock, Inc.$12M
  • STATE STREET CORP$6M
  • DIMENSIONAL FUND ADVISORS LP$5M
  • AMERICAN CENTURY COMPANIES INC$5M
  • First Eagle Investment Management, LLC$4M
  • MORGAN STANLEY$4M

Largest trims

  • Walleye Capital LLC$2M
  • CANNELL CAPITAL LLC$2M
  • BANK OF AMERICA CORP /DE/$2M
  • Qube Research & Technologies Ltd$2M
  • MARSHALL WACE, LLP$1M
  • SEI INVESTMENTS CO$727K

Institutional holders

One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.

FundSharesReported value% of valueQuarter
BlackRock, Inc. added961,577$41M8.9%2026-Q2
DIMENSIONAL FUND ADVISORS LP added850,080$37M7.9%2026-Q2
AEGIS FINANCIAL CORP trimmed584,872$25M5.4%2026-Q2
VANGUARD CAPITAL MANAGEMENT LLC added513,031$22M4.8%2026-Q2
WEBER CAPITAL MANAGEMENT LLC /ADV trimmed479,712$21M4.4%2026-Q2
TWO SIGMA INVESTMENTS, LP added410,330$18M3.8%2026-Q2
AMERICAN CENTURY COMPANIES INC added408,165$18M3.8%2026-Q2
AMERIPRISE FINANCIAL INC added380,171$16M3.5%2026-Q2
ROYCE & ASSOCIATES LP added363,319$16M3.4%2026-Q2
First Eagle Investment Management, LLC added347,685$15M3.2%2026-Q2
MORGAN STANLEY added322,382$14M3.0%2026-Q2
GEODE CAPITAL MANAGEMENT, LLC added320,351$14M3.0%2026-Q2
STATE STREET CORP added303,156$13M2.8%2026-Q2
Pacific Ridge Capital Partners, LLC trimmed303,023$13M2.8%2026-Q2
RENAISSANCE TECHNOLOGIES LLC trimmed214,142$9M2.0%2026-Q2
BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed199,064$9M1.8%2026-Q2
AWM Investment Company, Inc. trimmed189,732$8M1.8%2026-Q2
CITADEL ADVISORS LLC added184,747$8M1.7%2026-Q2
MILLENNIUM MANAGEMENT LLC trimmed178,871$8M1.7%2026-Q2
Phocas Financial Corp. trimmed154,426$7M1.4%2026-Q2
Russell Investments Group, Ltd. trimmed147,583$6M1.4%2026-Q2
RBF Capital, LLC140,000$6M1.3%2026-Q2
CANNELL CAPITAL LLC trimmed122,387$5M1.1%2026-Q2
Qube Research & Technologies Ltd trimmed122,284$5M1.1%2026-Q2
VANGUARD PORTFOLIO MANAGEMENT LLC added116,937$5M1.1%2026-Q2
NORTHERN TRUST CORP added115,575$5M1.1%2026-Q2
BNP PARIBAS FINANCIAL MARKETS added106,639$5M1.0%2026-Q2
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added100,072$4M0.9%2026-Q2
Bank of New York Mellon Corp added97,801$4M0.9%2026-Q2
Empowered Funds, LLC trimmed89,710$4M0.8%2026-Q2
Connor, Clark & Lunn Investment Management Ltd. added80,456$3M0.7%2026-Q2
CROWN ADVISORS MANAGEMENT, INC.80,000$3M0.7%2026-Q2
PRUDENTIAL FINANCIAL INC trimmed79,890$3M0.7%2026-Q2
VANGUARD FIDUCIARY TRUST CO added79,132$3M0.7%2026-Q2
Uniplan Investment Counsel, Inc. added77,249$3M0.7%2026-Q2
RAYMOND JAMES FINANCIAL INC trimmed75,487$3M0.7%2026-Q2
MARSHALL WACE, LLP trimmed69,089$3M0.6%2026-Q2
NORGES BANK new61,000$3M0.6%2026-Q2
Trexquant Investment LP added56,780$2M0.5%2026-Q2
Invesco Ltd. added55,943$2M0.5%2026-Q2
GOLDMAN SACHS GROUP INC trimmed52,547$2M0.5%2026-Q2
WHITE PINE CAPITAL LLC added48,615$2M0.5%2026-Q2
BANK OF AMERICA CORP /DE/ trimmed46,336$2M0.4%2026-Q2
Steward Partners Investment Advisory, LLC added44,841$2M0.4%2026-Q2
RICE HALL JAMES & ASSOCIATES, LLC trimmed43,343$2M0.4%2026-Q2
JPMORGAN CHASE & CO trimmed42,744$2M0.4%2026-Q2
D. E. Shaw & Co., Inc. added40,422$2M0.4%2026-Q2
Numerai GP LLC added40,236$2M0.4%2026-Q2
XTX Topco Ltd added39,550$2M0.4%2026-Q2
FIRST TRUST ADVISORS LP added36,690$2M0.3%2026-Q2
CHARLES SCHWAB INVESTMENT MANAGEMENT INC added34,417$1M0.3%2026-Q2
NEW YORK STATE COMMON RETIREMENT FUND added34,005$1M0.3%2026-Q2
Informed Momentum Co LLC trimmed33,651$1M0.3%2026-Q2
UBS Group AG trimmed31,141$1M0.3%2026-Q2
Calamos Advisors LLC added30,246$1M0.3%2026-Q2
TrueWealth Advisors, LLC trimmed27,120$1M0.3%2026-Q2
NOMURA ASSET MANAGEMENT INTERNATIONAL INC. new24,700$1M0.2%2026-Q2
Point72 Asset Management, L.P. trimmed23,832$1M0.2%2026-Q2
SEI INVESTMENTS CO trimmed23,115$997K0.2%2026-Q2
AQR CAPITAL MANAGEMENT LLC added22,399$966K0.2%2026-Q2
STIFEL FINANCIAL CORP added21,546$929K0.2%2026-Q2
Squarepoint Ops LLC added20,887$901K0.2%2026-Q2
Jump Financial, LLC added19,657$848K0.2%2026-Q2
Creative Planning added19,533$843K0.2%2026-Q2
Nuveen, LLC added19,110$824K0.2%2026-Q2
ARTHUR M. COHEN & ASSOCIATES, LLC added18,846$813K0.2%2026-Q2
HSBC HOLDINGS PLC added18,533$805K0.2%2026-Q2
North Star Investment Management Corp.17,000$733K0.2%2026-Q2
LAZARD ASSET MANAGEMENT LLC added16,874$728K0.2%2026-Q2
STRS OHIO added16,100$695K0.1%2026-Q2
FMR LLC added16,011$691K0.1%2026-Q2
Dynamic Technology Lab Private Ltd added15,978$689K0.1%2026-Q2
OneDigital Investment Advisors LLC new14,931$644K0.1%2026-Q2
Voleon Capital Management LP added14,711$635K0.1%2026-Q2
PRINCIPAL FINANCIAL GROUP INC added14,043$606K0.1%2026-Q2
RHUMBLINE ADVISERS added13,520$583K0.1%2026-Q2
Vanguard Global Advisers, LLC added13,313$574K0.1%2026-Q2
Kestra Advisory Services, LLC13,000$561K0.1%2026-Q2
Quadrature Capital Ltd trimmed12,328$532K0.1%2026-Q2
DEUTSCHE BANK AG\ added11,743$507K0.1%2026-Q2
WELLS FARGO & COMPANY/MN added10,985$474K0.1%2026-Q2
BARCLAYS PLC added10,581$456K0.1%2026-Q2
CITIGROUP INC added10,568$456K0.1%2026-Q2
STATE OF WISCONSIN INVESTMENT BOARD trimmed10,520$454K0.1%2026-Q2
PDT Partners, LLC10,075$435K0.1%2026-Q2
PRICE T ROWE ASSOCIATES INC /MD/ added9,730$420K0.1%2026-Q2
R Squared Ltd trimmed9,711$419K0.1%2026-Q2
LPL Financial LLC added9,698$418K0.1%2026-Q2
Quantbot Technologies LP added9,309$402K0.1%2026-Q2
Susquehanna Portfolio Strategies, LLC new8,372$361K0.1%2026-Q2
Aquatic Capital Management LLC added8,286$357K0.1%2026-Q2
Walleye Capital LLC trimmed7,998$345K0.1%2026-Q2
LOS ANGELES CAPITAL MANAGEMENT LLC trimmed7,825$338K0.1%2026-Q2
Y-Intercept (Hong Kong) Ltd new7,793$336K0.1%2026-Q2
Boston Partners trimmed7,588$327K0.1%2026-Q2
OSAIC HOLDINGS, INC. added7,553$326K0.1%2026-Q2
SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed7,401$319K0.1%2026-Q2
Engineers Gate Manager LP trimmed7,314$316K0.1%2026-Q2
Illumine Investment Management, LLC trimmed0$1M0.3%2026-Q2
BRASADA CAPITAL MANAGEMENT, LP trimmed0$647K0.1%2026-Q2

Ownership over time

Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.

HoldersTotal shares

Reading this table

Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.

About 13F filings

A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.

Learn how to read institutional ownership