Who owns Antero Midstream (AM)
Which tracked institutional funds hold AM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AM 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.
How the tape is positioned
90 tracked funds added or opened AM while 106 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
AM’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 AM more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in AM 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 502 tracked filers holding AM, 243 increased or opened the position and 243 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 AM 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 19
- SIR Capital Management, L.P.$11M
- Artisan Partners Limited Partnership$9M
- CAXTON ASSOCIATES LLP$9M
- Aventail Capital Group, LP$5M
- Holocene Advisors, LP$4M
- Jupiter Topco LLC$4M
Full exits 33
- CHICKASAW CAPITAL MANAGEMENT LLC$31M
- Thrivent Financial for Lutherans$16M
- Pacer Advisors, Inc.$13M
- Amundi$13M
- CANADA LIFE ASSURANCE Co$10M
- SG Americas Securities, LLC$9M
Largest adds
- BlackRock, Inc.$163M
- Covalis Capital LLP$47M
- GOLDMAN SACHS GROUP INC$19M
- FIRST TRUST ADVISORS LP$18M
- Connor, Clark & Lunn Investment Management Ltd.$17M
- UBS Group AG$17M
Largest trims
- Bank of New York Mellon Corp$51M
- PRUDENTIAL FINANCIAL INC$50M
- KAYNE ANDERSON CAPITAL ADVISORS LP$47M
- TORTOISE CAPITAL ADVISORS, L.L.C.$23M
- Invesco Ltd.$16M
- Fiera Capital Corp$16M
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.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 38,199,783 | $869M | 14.6% | 2026-Q2 |
| Invesco Ltd. trimmed | 20,746,981 | $472M | 7.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 18,193,196 | $414M | 6.9% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 14,958,776 | $340M | 5.7% | 2026-Q2 |
| STATE STREET CORP trimmed | 11,558,546 | $263M | 4.4% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 10,358,867 | $236M | 3.9% | 2026-Q2 |
| TORTOISE CAPITAL ADVISORS, L.L.C. trimmed | 10,183,484 | $232M | 3.9% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 9,010,119 | $205M | 3.4% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 7,434,848 | $169M | 2.8% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 6,917,415 | $157M | 2.6% | 2026-Q2 |
| MORGAN STANLEY added | 6,702,243 | $152M | 2.6% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 3,907,744 | $89M | 1.5% | 2026-Q2 |
| NORTHERN TRUST CORP added | 3,742,333 | $85M | 1.4% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 3,680,777 | $84M | 1.4% | 2026-Q2 |
| Clearbridge Investments, LLC trimmed | 3,679,103 | $84M | 1.4% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 3,625,697 | $83M | 1.4% | 2026-Q2 |
| Boston Trust Walden Corp added | 3,451,218 | $79M | 1.3% | 2026-Q2 |
| NORGES BANK trimmed | 3,413,527 | $78M | 1.3% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 3,189,797 | $73M | 1.2% | 2026-Q2 |
| Covalis Capital LLP added | 3,031,515 | $69M | 1.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 2,861,809 | $65M | 1.1% | 2026-Q2 |
| Gotham Asset Management, LLC added | 2,644,371 | $60M | 1.0% | 2026-Q2 |
| Clark Capital Management Group, Inc. added | 2,616,377 | $60M | 1.0% | 2026-Q2 |
| Blackstone Inc. trimmed | 2,612,875 | $59M | 1.0% | 2026-Q2 |
| WESTWOOD HOLDINGS GROUP INC added | 2,570,360 | $58M | 1.0% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 2,446,954 | $56M | 0.9% | 2026-Q2 |
| Orbis Allan Gray Ltd added | 2,420,433 | $55M | 0.9% | 2026-Q2 |
| KAYNE ANDERSON CAPITAL ADVISORS LP trimmed | 2,192,659 | $50M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 2,102,128 | $48M | 0.8% | 2026-Q2 |
| UBS Group AG added | 2,091,865 | $48M | 0.8% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 2,022,284 | $46M | 0.8% | 2026-Q2 |
| Brookfield Corp /ON/ | 1,935,500 | $44M | 0.7% | 2026-Q2 |
| FMR LLC added | 1,875,073 | $43M | 0.7% | 2026-Q2 |
| Brave Warrior Advisors, LLC trimmed | 1,823,631 | $41M | 0.7% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 1,808,051 | $41M | 0.7% | 2026-Q2 |
| EAGLE GLOBAL ADVISORS LLC added | 1,802,543 | $41M | 0.7% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 1,797,786 | $41M | 0.7% | 2026-Q2 |
| BARCLAYS PLC added | 1,525,823 | $35M | 0.6% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 1,516,739 | $35M | 0.6% | 2026-Q2 |
| RR Advisors, LLC | 1,513,610 | $34M | 0.6% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 1,228,188 | $28M | 0.5% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 1,175,694 | $27M | 0.4% | 2026-Q2 |
| MILLER HOWARD INVESTMENTS INC /NY trimmed | 1,104,337 | $25M | 0.4% | 2026-Q2 |
| NEOS Investment Management LLC added | 1,084,544 | $25M | 0.4% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 1,050,469 | $24M | 0.4% | 2026-Q2 |
| ALPS ADVISORS INC trimmed | 1,014,764 | $23M | 0.4% | 2026-Q2 |
| EXCHANGE TRADED CONCEPTS, LLC added | 971,678 | $22M | 0.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 927,025 | $21M | 0.4% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 917,641 | $21M | 0.3% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 897,676 | $20M | 0.3% | 2026-Q2 |
| Fiera Capital Corp trimmed | 894,031 | $20M | 0.3% | 2026-Q2 |
| Cetera Investment Advisers added | 882,377 | $20M | 0.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 798,718 | $18M | 0.3% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 792,754 | $18M | 0.3% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 790,794 | $18M | 0.3% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 754,663 | $17M | 0.3% | 2026-Q2 |
| Columbus Macro, LLC trimmed | 750,707 | $17M | 0.3% | 2026-Q2 |
| California Public Employees Retirement System added | 729,527 | $17M | 0.3% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 728,849 | $17M | 0.3% | 2026-Q2 |
| Freestone Grove Partners LP added | 698,696 | $16M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 664,500 | $15M | 0.3% | 2026-Q2 |
| Edgestream Partners, L.P. added | 660,363 | $15M | 0.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 644,890 | $15M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 582,381 | $13M | 0.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 571,156 | $13M | 0.2% | 2026-Q2 |
| LPL Financial LLC trimmed | 558,179 | $13M | 0.2% | 2026-Q2 |
| SHAH CAPITAL MANAGEMENT trimmed | 556,830 | $13M | 0.2% | 2026-Q2 |
| Nuveen, LLC trimmed | 490,706 | $11M | 0.2% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 490,453 | $11M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 483,752 | $11M | 0.2% | 2026-Q2 |
| Abacus FCF Advisors LLC added | 474,204 | $11M | 0.2% | 2026-Q2 |
| SIR Capital Management, L.P. trimmed | 467,598 | $11M | 0.2% | 2026-Q2 |
| Walleye Capital LLC added | 459,598 | $10M | 0.2% | 2026-Q2 |
| Grey Fox Wealth Advisors, LLC added | 457,767 | $10M | 0.2% | 2026-Q2 |
| Waverly Advisors, LLC trimmed | 444,256 | $10M | 0.2% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 420,453 | $10M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 401,028 | $9M | 0.2% | 2026-Q2 |
| Artisan Partners Limited Partnership new | 395,008 | $9M | 0.2% | 2026-Q2 |
| CAXTON ASSOCIATES LLP added | 394,955 | $9M | 0.2% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC added | 388,248 | $9M | 0.1% | 2026-Q2 |
| Ruffer LLP added | 384,010 | $9M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 383,063 | $9M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 361,240 | $8M | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 345,749 | $8M | 0.1% | 2026-Q2 |
| Retirement Systems of Alabama trimmed | 343,883 | $8M | 0.1% | 2026-Q2 |
| Maryland State Retirement & Pension System added | 329,651 | $7M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 318,412 | $7M | 0.1% | 2026-Q2 |
| CIBC Bancorp USA Inc. added | 287,782 | $7M | 0.1% | 2026-Q2 |
| HENNESSY ADVISORS INC trimmed | 286,910 | $7M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 278,189 | $6M | 0.1% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM trimmed | 277,091 | $6M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 273,410 | $6M | 0.1% | 2026-Q2 |
| EVERGREEN CAPITAL MANAGEMENT LLC trimmed | 272,802 | $6M | 0.1% | 2026-Q2 |
| Phocas Financial Corp. trimmed | 272,106 | $6M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 256,771 | $6M | 0.1% | 2026-Q2 |
| Sanctuary Advisors, LLC added | 254,942 | $6M | 0.1% | 2026-Q2 |
| Hennion & Walsh Asset Management, Inc. added | 254,560 | $6M | 0.1% | 2026-Q2 |
| Quantbot Technologies LP added | 253,117 | $6M | 0.1% | 2026-Q2 |
| CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT added | 251,000 | $6M | 0.1% | 2026-Q2 |
| MML INVESTORS SERVICES, LLC added | 247,463 | $6M | 0.1% | 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.
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.