Antero Midstream Corporation
US ˙ NYSE ˙ US03676B1026

SecurityAM / Antero Midstream Corporation
InstitutionSIR Capital Management, L.P.
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
SIR Capital Management, L.P. closes position in AM / Antero Midstream Corporation

On May 15, 2026 - SIR Capital Management, L.P. filed a 13F-HR form disclosing ownership of 0 shares of Antero Midstream Corporation (US:AM) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,772,534 shares of Antero Midstream Corporation. The current value of the position is $0 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-15 2026-03-31 13F ANTERO MIDSTREAM COM 03676B102 0 -100.00 0
2026-02-13 2025-12-31 13F ANTERO MIDSTREAM COM 03676B102 1,772,534 389,185 28.13 31,533 17.26 3.4890
2025-11-14 2025-09-30 13F ANTERO MIDSTREAM COM 03676B102 1,383,349 1,266,794 1,086.86 26,892 1,117.93 2.4119
2025-08-12 2025-06-30 13F ANTERO MIDSTREAM COM 03676B102 116,555 -1,190,997 -91.09 2,209 -90.62 0.1970
2025-05-15 2025-03-31 13F ANTERO MIDSTREAM COM 03676B102 1,307,552 -1,015,718 -43.72 23,536 -32.87 2.0656
2025-02-14 2024-12-31 13F ANTERO MIDSTREAM COM 03676B102 2,323,270 2,323,270 35,058 3.6145
2024-11-14 2024-09-30 13F ANTERO MIDSTREAM COM 03676B102 0 -559,774 -100.00 0 -100.00
2024-08-07 2024-06-30 13F ANTERO MIDSTREAM COM 03676B102 559,774 559,774 8,251 0.8204
2024-05-15 2024-03-31 13F ANTERO MIDSTREAM COM 03676B102 0 -913,811 -100.00 0 -100.00
2024-02-14 2023-12-31 13F ANTERO MIDSTREAM COM 03676B102 913,811 305,000 50.10 11,450 57.00 1.1714
2023-11-14 2023-09-30 13F ANTERO MIDSTREAM COM 03676B102 608,811 608,811 7,294 0.8656
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.