Antero Midstream Corporation
US ˙ NYSE ˙ US03676B1026

SecurityAM / Antero Midstream Corporation
InstitutionSummit Trail Advisors, Llc
Latest Disclosed Ownership34,199 shares
Latest Disclosed Value $ 779,737
Summit Trail Advisors, Llc reports 25.56% increase in ownership of AM / Antero Midstream Corporation

On May 12, 2026 - Summit Trail Advisors, Llc filed a 13F-HR form disclosing ownership of 34,199 shares of Antero Midstream Corporation (US:AM) valued at $779,737 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 27,237 shares of Antero Midstream Corporation. This represents a change in shares of 25.56% during the quarter. The current value of the position is $727,413 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F ANTERO MIDSTREAM COM 03676B102 34,199 6,962 25.56 780 60.95 0.0112
2026-02-17 2025-12-31 13F ANTERO MIDSTREAM COM 03676B102 27,237 788 2.98 485 -5.84 0.0084
2025-11-14 2025-09-30 13F ANTERO MIDSTREAM COM 03676B102 26,449 11,839 81.03 514 86.23 0.0071
2025-08-14 2025-06-30 13F ANTERO MIDSTREAM COM 03676B102 14,610 14,610 277 0.0048
2021-02-16 2020-12-31 13F Davita Healthcare Partners Equity 03676B102 0 -21,514 -100.00 0 -100.00
2020-11-16 2020-09-30 13F Davita Healthcare Partners Equity 03676B102 21,514 21,514 2,306 0.4460
2019-02-13 2018-12-31 13F ANTERO MIDSTREAM GP LP COM SHS REPSTG EQUITY 03675Y103 0 -21,017 -100.00 0 -100.00
2018-11-14 2018-09-30 13F ANTERO MIDSTREAM PARTNERS LP UNT LTD PARTN EQUITY 03673L103 21,017 12,796 155.65 602 288.39 0.1328
2018-11-14 2018-09-30 13F ANTERO MIDSTREAM GP LP COM SHS REPSTG EQUITY 03675Y103 10,882 -10,135 184 0.0406
2018-08-10 2018-06-30 13F Antero Midstream GP EQUITY 03675Y103 8,221 -86,333 -91.31 155 -92.87 0.0542
2018-08-10 2018-06-30 13F Antero Midstream Partners LP Unit LTD Partnership Int EQUITY 03673L103 19,384 -45,891 572 0.2000
2018-05-22 2018-03-31 13F/A-1 ANTERO MIDSTREAM PARTNERS LP UNIT LTD PARTNERSHIP INT EQUITY 03673L103 94,554 6,385 7.24 2,173 -24.50 0.3688
2018-05-22 2018-03-31 13F/A-1 ANTERO MIDSTREAM GP LP COM SHS REPSTG LTD PARTNER INTS EQUITY 03675Y103 65,275 -22,894 942 0.1599
2018-05-21 2018-03-31 13F ANTERO MIDSTREAM PARTNERS LP UNIT LTD PARTNERSHIP INT EQUITY 03673L103 2,172,949 2,084,780 2,173
2018-05-21 2018-03-31 13F ANTERO MIDSTREAM GP LP COM SHS REPSTG LTD PARTNER INTS EQUITY 03675Y103 942,239 901,720 942
2018-02-14 2017-12-31 13F ANTERO MIDSTREAM PARTNERS LP UNT LTD PARTN Units 03673L103 88,169 88,169 2,878 0.3634
2018-02-14 2017-12-31 13F ANTERO MIDSTREAM GP LP COM SHS REPSTG Units 03675Y103 40,519 40,519 887 0.1120
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.