Antero Midstream Corporation
US ˙ NYSE ˙ US03676B1026

SecurityAM / Antero Midstream Corporation
InstitutionHeronetta Management, L.P.
Latest Disclosed Ownership16,910 shares
Latest Disclosed Value $ 385,548
Heronetta Management, L.P. ownership in AM / Antero Midstream Corporation

On May 1, 2026 - Heronetta Management, L.P. filed a 13F-HR form disclosing ownership of 16,910 shares of Antero Midstream Corporation (US:AM) valued at $385,548 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 16,910 shares of Antero Midstream Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $359,676 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)
2026-05-01 2026-03-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 386 28.33 0.3519
2026-02-04 2025-12-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 301 -8.54 0.1739
2025-11-12 2025-09-30 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 329 2.50 0.1800
2025-08-06 2025-06-30 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 320 5.26 0.1785
2025-05-15 2025-03-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 304 19.22 0.1663
2025-02-06 2024-12-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 255 0.39 0.1458
2024-10-31 2024-09-30 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 254 2.01 0.1556
2024-07-30 2024-06-30 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 249 5.06 0.1594
2024-05-01 2024-03-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 238 12.32 0.1535
2024-01-25 2023-12-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 212 4.46 0.1501
2023-11-02 2023-09-30 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 203 3.06 0.1486
2023-08-09 2023-06-30 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 196 10.73 0.1435
2023-05-10 2023-03-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 0 0.00 177 -2.75 0.1303
2023-02-10 2022-12-31 13F ANTERO MIDSTREAM COM 03676B102 16,910 16,910 182 0.1151
2019-04-30 2019-03-31 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 0 -72,100 -100.00 0 -100.00
2019-02-12 2018-12-31 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 72,100 0 0.00 1,542 -25.36 1.0000
2018-11-13 2018-09-30 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 72,100 2,000 2.85 2,066 -0.14 1.1565
2018-07-31 2018-06-30 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 70,100 -13,400 -16.05 2,069 -4.30 1.1803
2018-05-14 2018-03-31 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 83,500 11,200 15.49 2,162 2.95 1.3031
2018-02-14 2017-12-31 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 72,300 2,000 2.84 2,100 -5.28 1.1236
2017-10-31 2017-09-30 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 70,300 7,000 11.06 2,217 5.57 1.2281
2017-08-11 2017-06-30 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 63,300 15,400 32.15 2,100 32.24 1.1625
2017-05-09 2017-03-31 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 47,900 15,400 47.38 1,588 58.17 0.7952
2017-02-13 2016-12-31 13F ANTERO MIDSTREAM PARTNERS UNT LTD PARTN 03673L103 32,500 32,500 1,004 0.5199
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.