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AM · Antero Midstream Corp · Holdings

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$21.10 +0.31 (+1.49%) At close · Oct 27 Q2 2026 earnings call transcript
Market Cap
$10.02B
Shares
474.67M
Volume · Oct 27 2.56M Avg daily vol (3M) 2.53M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 540
Total Value: $6,548,795,418
Total Shares: 288,746,507
Showing 1–100 of 558 holdings by value · page 1 of 6

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 540 13F filers
Top Holder
13.2%
Sep 2023 → Jun 2026 · range 13.1% – 14.8%
of institutional value
Top 5
35.9%
Sep 2023 → Jun 2026 · range 35.9% – 49.1%
of institutional value
Top 10
51.1%
Sep 2023 → Jun 2026 · range 51.1% – 61.5%
of institutional value
HHI
390
Sep 2023 → Jun 2026 · range 390 – 654
Broadly held

Who Holds AM

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 535 filers, like-for-like change +0.9%; actively managed books +0.7%; index-like books +1.2%.

Holder type Share Filers Change
Registered adviser 42.6% 303 +1.6%
Exempt adviser 1.3% 6 +38.2%
Adviser 10.3% 13 -2.5%
Bank 10.6% 27 -5.2%
Insurer 0.4% 4 -63.2%
Broker-dealer 0.2% 1 -1.4%
Benefit plan 0.3% 7 -7.1%
Non-US 2.9% 9 -4.3%
Holding company 20.5% 11 +5.7%
Unknown 10.9% 154 +4.0%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 6 holders with no observed 2026-03-31 13F and 6 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.

Conviction and Crowding

535 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
7
1.31% of filers hold it in their top 10
Mar 31, 2026: 5
Holders above 5%
1
median weight 0.007%
Mar 31, 2026: 1
Crowding
13.7%
of shares outstanding, 41st percentile
Mar 31, 2026: 13.2%
Private-fund advisers
13.3%
of shares outstanding
Institutional ownership
60.1%
61.0% of the estimated free float
Top 10 holders
51.7%
of 13F shares, Herfindahl 0.040
Active holders
+0.7%
like-for-like share change of active filers
5% stakes on record
1
0 13D, 1 13G (1 institutional, 0 passive, 0 exempt)
How long holders have held it value-weighted 16.8 quarters
Under 1 year 17.3% 1 to 3 years 22.5% 3 years or more 60.3% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$16.48
estimated per share
Mar 31, 2026: $15.69
Quarter-end price
$22.75
implied by 13F values
Estimated gain or loss
+38.0%
price against the estimated cost
Estimated at a loss
0.000%
of costed 13F value

Estimated cost covers 26.3% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies AM's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 HESM Hess Midstream LP 19
2 KNTK Kinetik Holdings Inc. 19
3 WES Western Midstream Partners, LP 21
4 GEL Genesis Energy LP 10
5 GLP Global Partners LP 9
6 CQP Cheniere Energy Partners, L.P. 11
7 MPLX Mplx LP 26
8 PAGP Plains Gp Holdings LP 15
9 APC ARKO Petroleum Corp. 5
10 USAC USA Compression Partners, LP 9

Shareholder Targets

13F filers that own its peers but not AM, quarter ended Jun 30, 2026

Found through its holder-overlap peers: HESM, KNTK, WES, GEL, GLP, CQP, MPLX, PAGP, APC, USAC, AR, TRGP, SUN, DTM, SUNC, PAA, OKE, KGS, DKL, WLKP. 2,059 filers in all.

# Filer In peers
1 HARRIS ASSOCIATES L P Registered adviser, Index-like $2,128,369,294 1 held
2 Capital International Investors Adviser, Diversified active $1,495,721,237 1 held
3 Energy Income Partners, LLC Registered adviser, Diversified active $1,129,203,337 10 held
4 First Eagle Investment Management, LLC Registered adviser, Diversified active $1,028,946,941 2 held
5 MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser, Diversified active $918,092,892 5 held
6 Capital Research Global Investors Adviser, Diversified active $717,895,471 2 held
7 COHEN & STEERS, INC. Adviser, Diversified active $554,592,681 10 held
8 BAHL & GAYNOR INC Adviser, Diversified active $554,369,572 5 held
9 Recurrent Investment Advisors LLC Registered adviser, Diversified active $482,744,150 9 held
10 Zimmer Partners, LP Registered adviser, Diversified active $457,718,201 5 held

Fund Ownership of AM by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 18.46% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 2.49% 11,799,536
Index ETFs 15.98% 75,843,065
Active ETFs 2.25% 10,676,446
Active funds 10.39% 49,310,780
Unclassified 1.33% 6,317,622
All registered funds 32.43% 153,947,449
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Showing 100 of 558
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Holder Value (USD) % of 13F Shares Open

Showing the top 100 of 558 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 1623925 CUSIP 03676B102 13F (30d) 122 filings 112 filers Visit website Investor relations