Who owns Arq, Inc. (ARQ)
Which tracked institutional funds hold ARQ, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ARQ company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
7 tracked funds added or opened ARQ while 13 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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
ARQ’s largest tracked holder by dollar value, AIGH Capital Management LLC, sizes it at 1.5% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.5pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ARQ 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 2025-Q4 and 2026-Q1, across 95 tracked filers holding ARQ, 52 increased or opened the position and 49 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 ARQ between the 2025-Q4 and 2026-Q1 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 2
- VANGUARD CAPITAL MANAGEMENT LLC$4M
- VANGUARD FIDUCIARY TRUST CO$521K
Full exits 4
- AIGH Capital Management LLC$7M
- VANGUARD GROUP INC$6M
- Alta Fundamental Advisers LLC$3M
- GRATIA CAPITAL, LLC$507K
Largest adds
- AQR CAPITAL MANAGEMENT LLC$2M
- Peapod Lane Capital LLC$1M
- MARSHALL WACE, LLP$620K
- D. E. Shaw & Co., Inc.$474K
- BANK OF AMERICA CORP /DE/$261K
Largest trims
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$2M
- BlackRock, Inc.$1M
- DIMENSIONAL FUND ADVISORS LP$1M
- MORGAN STANLEY$888K
- GEODE CAPITAL MANAGEMENT, LLC$493K
- Marex Group plc$468K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 2,097,522 | $5M | 7.2% | 2026-Q1 |
| ROYCE & ASSOCIATES LP added | 1,748,444 | $4M | 6.0% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,431,450 | $4M | 4.9% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 1,082,304 | $3M | 3.7% | 2026-Q1 |
| MARSHALL WACE, LLP added | 809,705 | $2M | 2.8% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 801,231 | $2M | 2.7% | 2026-Q1 |
| Peapod Lane Capital LLC added | 775,349 | $2M | 2.6% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 762,190 | $2M | 2.6% | 2026-Q1 |
| STATE STREET CORP added | 564,598 | $1M | 1.9% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 410,570 | $1M | 1.4% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 351,188 | $899K | 1.2% | 2026-Q1 |
| DCF Advisers, LLC added | 327,803 | $839K | 1.1% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 289,158 | $740K | 1.0% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 249,187 | $638K | 0.9% | 2026-Q1 |
| NORTHERN TRUST CORP added | 228,356 | $585K | 0.8% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 203,770 | $522K | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 203,537 | $521K | 0.7% | 2026-Q1 |
| Round Rock Advisors LLC new | 190,708 | $488K | 0.7% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 189,890 | $486K | 0.6% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 184,246 | $472K | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 140,926 | $361K | 0.5% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 133,045 | $341K | 0.5% | 2026-Q1 |
| MORGAN STANLEY trimmed | 116,028 | $297K | 0.4% | 2026-Q1 |
| Corient Private Wealth LLC trimmed | 77,500 | $198K | 0.3% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 75,796 | $194K | 0.3% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 74,780 | $191K | 0.3% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 1,110 | $187K | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp | 73,079 | $187K | 0.2% | 2026-Q1 |
| XTX Topco Ltd trimmed | 72,660 | $186K | 0.2% | 2026-Q1 |
| STRS OHIO added | 72,400 | $185K | 0.2% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 69,775 | $179K | 0.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 65,117 | $167K | 0.2% | 2026-Q1 |
| Marex Group plc trimmed | 60,000 | $154K | 0.2% | 2026-Q1 |
| GABELLI FUNDS LLC | 52,000 | $133K | 0.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 45,519 | $117K | 0.2% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | 42,326 | $108K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 41,196 | $105K | 0.1% | 2026-Q1 |
| Invesco Ltd. added | 37,738 | $97K | 0.1% | 2026-Q1 |
| Scientech Research LLC new | 34,628 | $89K | 0.1% | 2026-Q1 |
| Nuveen, LLC | 33,406 | $86K | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 30,543 | $78K | 0.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 28,700 | $73K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 22,592 | $58K | 0.1% | 2026-Q1 |
| SIMPLEX TRADING, LLC added | 21,981 | $56K | 0.1% | 2026-Q1 |
| Mariner, LLC added | 19,214 | $49K | 0.1% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 19,128 | $49K | 0.1% | 2026-Q1 |
| MERCER GLOBAL ADVISORS INC /ADV new | 18,814 | $48K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 16,868 | $44K | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 17,560 | $44K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 12,700 | $42K | 0.1% | 2026-Q1 |
| AIGH Capital Management LLC trimmed | 2,273,092 | $7M | 9.9% | 2025-Q4 stale |
| VANGUARD GROUP INC added | 1,830,017 | $6M | 8.0% | 2025-Q4 stale |
| WELLINGTON MANAGEMENT GROUP LLP | 686,105 | $5M | 6.6% | 2025-Q3 stale |
| Vitol Holding B.V. | 511,392 | $4M | 4.9% | 2025-Q3 stale |
| York Capital Management Global Advisors, LLC | 442,959 | $3M | 4.2% | 2025-Q3 stale |
| Alta Fundamental Advisers LLC trimmed | 781,088 | $3M | 3.4% | 2025-Q4 stale |
| CenterBook Partners LP new | 230,869 | $2M | 2.2% | 2025-Q3 stale |
| First Eagle Investment Management, LLC new | 160,731 | $1M | 1.5% | 2025-Q3 stale |
| GatePass Capital, LLC new | 88,968 | $637K | 0.9% | 2025-Q3 stale |
| Walleye Capital LLC added | 83,520 | $598K | 0.8% | 2025-Q3 stale |
| GRATIA CAPITAL, LLC trimmed | 155,000 | $507K | 0.7% | 2025-Q4 stale |
| LAZARD ASSET MANAGEMENT LLC added | 110,783 | $362K | 0.5% | 2025-Q4 stale |
| Trexquant Investment LP added | 48,921 | $350K | 0.5% | 2025-Q3 stale |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 83,327 | $347K | 0.5% | 2025-Q1 stale |
| Maven Securities LTD added | 80,421 | $335K | 0.4% | 2025-Q1 stale |
| ExodusPoint Capital Management, LP added | 42,108 | $301K | 0.4% | 2025-Q3 stale |
| DEUTSCHE BANK AG\ added | 34,264 | $245K | 0.3% | 2025-Q3 stale |
| Rothschild Wealth LLC new | 75,000 | $245K | 0.3% | 2025-Q4 stale |
| Perritt Capital Management Inc | 75,000 | $245K | 0.3% | 2025-Q4 stale |
| Aristides Capital LLC trimmed | 43,487 | $234K | 0.3% | 2025-Q2 stale |
| CITADEL ADVISORS LLC trimmed | 63,401 | $207K | 0.3% | 2025-Q4 stale |
| Point72 Asset Management, L.P. new | 61,032 | $200K | 0.3% | 2025-Q4 stale |
| Numerai GP LLC new | 26,503 | $190K | 0.3% | 2025-Q3 stale |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 34,522 | $185K | 0.2% | 2025-Q2 stale |
| Worth Venture Partners, LLC new | 22,500 | $161K | 0.2% | 2025-Q3 stale |
| 1492 Capital Management LLC trimmed | 44,306 | $145K | 0.2% | 2025-Q4 stale |
| GAMMA Investing LLC added | 546 | $131K | 0.2% | 2025-Q1 stale |
| MetLife Investment Management, LLC trimmed | 18,034 | $129K | 0.2% | 2025-Q3 stale |
| Cerity Partners LLC | 28,428 | $119K | 0.2% | 2025-Q1 stale |
| Jump Financial, LLC added | 33,129 | $108K | 0.1% | 2025-Q4 stale |
| Centiva Capital, LP new | 13,631 | $98K | 0.1% | 2025-Q3 stale |
| AXQ CAPITAL, LP new | 13,374 | $96K | 0.1% | 2025-Q3 stale |
| AlphaQuest LLC new | 11,618 | $83K | 0.1% | 2025-Q3 stale |
| COMMONWEALTH EQUITY SERVICES, LLC new | 11,500 | $82K | 0.1% | 2025-Q3 stale |
| LOS ANGELES CAPITAL MANAGEMENT LLC new | 11,325 | $76K | 0.1% | 2025-Q4 stale |
| STATE OF WISCONSIN INVESTMENT BOARD added | 22,965 | $75K | 0.1% | 2025-Q4 stale |
| Jain Global LLC new | 22,800 | $75K | 0.1% | 2025-Q4 stale |
| SummitTX Capital, L.P. new | 16,600 | $69K | 0.1% | 2025-Q1 stale |
| Brandywine Global Investment Management, LLC | 16,050 | $67K | 0.1% | 2025-Q1 stale |
| ALGERT GLOBAL LLC added | 20,170 | $66K | 0.1% | 2025-Q4 stale |
| Catalyst Funds Management Pty Ltd new | 15,000 | $63K | 0.1% | 2025-Q1 stale |
| GROUP ONE TRADING LLC trimmed | 14,911 | $62K | 0.1% | 2025-Q1 stale |
| Corebridge Financial, Inc. added | 14,123 | $59K | 0.1% | 2025-Q1 stale |
| Squarepoint Ops LLC trimmed | 17,113 | $56K | 0.1% | 2025-Q4 stale |
| Voya Investment Management LLC trimmed | 10,249 | $55K | 0.1% | 2025-Q2 stale |
| SEI INVESTMENTS CO new | 15,877 | $52K | 0.1% | 2025-Q4 stale |
| Trail Ridge Investment Advisors, LLC | 12,220 | $51K | 0.1% | 2025-Q1 stale |
| Dynamic Technology Lab Private Ltd added | 14,337 | $47K | 0.1% | 2025-Q4 stale |
| INTECH INVESTMENT MANAGEMENT LLC trimmed | 13,805 | $45K | 0.1% | 2025-Q4 stale |
| SG Americas Securities, LLC trimmed | 10,495 | $44K | 0.1% | 2025-Q1 stale |
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.
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.