Antero Midstream Corporation
US ˙ NYSE ˙ US03676B1026

SecurityAM / Antero Midstream Corporation
InstitutionState Street Corp
Latest Disclosed Ownership11,593,199 shares
Latest Disclosed Value $ 264,324,937
State Street Corp reports 2.26% increase in ownership of AM / Antero Midstream Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 11,593,199 shares of Antero Midstream Corporation (US:AM) valued at $264,324,937 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 11,337,298 shares of Antero Midstream Corporation. This represents a change in shares of 2.26% during the quarter. The current value of the position is $246,587,343 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)
2026-05-15 2026-03-31 13F ANTERO MIDSTREAM COM 03676B102 11,593,199 255,901 2.26 264,325 31.05 0.0091
2026-02-13 2025-12-31 13F ANTERO MIDSTREAM COM 03676B102 11,337,298 187,912 1.69 201,691 -6.95 0.0068
2025-11-14 2025-09-30 13F ANTERO MIDSTREAM COM 03676B102 11,149,386 -276,824 -2.42 216,744 0.10 0.0075
2025-08-14 2025-06-30 13F ANTERO MIDSTREAM COM 03676B102 11,426,210 -197,922 -1.70 216,527 3.49 0.0081
2025-05-15 2025-03-31 13F ANTERO MIDSTREAM COM 03676B102 11,624,132 127,289 1.11 209,234 20.61 0.0086
2025-02-14 2024-12-31 13F ANTERO MIDSTREAM COM 03676B102 11,496,843 410,056 3.70 173,487 3.97 0.0068
2024-11-14 2024-09-30 13F ANTERO MIDSTREAM COM 03676B102 11,086,787 160,593 1.47 166,856 3.60 0.0068
2024-08-14 2024-06-30 13F ANTERO MIDSTREAM COM 03676B102 10,926,194 107,618 0.99 161,052 5.88 0.0070
2024-05-15 2024-03-31 13F ANTERO MIDSTREAM COM 03676B102 10,818,576 187,763 1.77 152,109 14.19 0.0068
2024-02-14 2023-12-31 13F ANTERO MIDSTREAM COM 03676B102 10,630,813 397,696 3.89 133,204 8.66 0.0065
2023-11-14 2023-09-30 13F ANTERO MIDSTREAM COM 03676B102 10,233,117 575,122 5.95 122,593 9.43 0.0068
2023-08-14 2023-06-30 13F ANTERO MIDSTREAM COM 03676B102 9,657,995 -130,937 -1.34 112,033 9.10 0.0059
2023-05-15 2023-03-31 13F ANTERO MIDSTREAM COM 03676B102 9,788,932 123,885 1.28 102,686 -1.53 0.0058
2023-05-15 2022-12-31 13F/A-99 ANTERO MIDSTREAM COM 03676B102 9,665,047 60,962 0.63 104,286 18.28 0.0061
2023-05-15 2022-12-31 13F ANTERO MIDSTREAM COM 03676B102 9,665,047 60,962 104,286 0.0061
2022-11-15 2022-09-30 13F ANTERO MIDSTREAM COM 03676B102 9,604,085 142,171 1.50 88,166 2.96 0.0056
2022-08-15 2022-06-30 13F ANTERO MIDSTREAM COM 03676B102 9,461,914 100,637 1.08 85,630 -15.85 0.0051
2022-05-16 2022-03-31 13F ANTERO MIDSTREAM COM 03676B102 9,361,277 433,025 4.85 101,757 17.74 0.0050
2022-02-14 2021-12-31 13F ANTERO MIDSTREAM COM 03676B102 8,928,252 92,886 1.05 86,425 -6.13 0.0041
2021-11-15 2021-09-30 13F ANTERO MIDSTREAM COM 03676B102 8,835,366 581,562 7.05 92,065 7.36 0.0049
2021-08-16 2021-06-30 13F ANTERO MIDSTREAM COM 03676B102 8,253,804 1,028,876 14.24 85,757 31.45 0.0045
2021-07-09 2021-03-31 13F/A-1 ANTERO MIDSTREAM COM 03676B102 7,224,928 202,819 2.89 65,241 20.50 0.0037
2021-05-17 2021-03-31 13F ANTERO MIDSTREAM COM 03676B102 7,224,928 202,819 65,241 0.0037
2021-02-16 2020-12-31 13F ANTERO MIDSTREAM COM 03676B102 7,022,109 262,465 3.88 54,140 49.15 0.0033
2020-11-10 2020-09-30 13F ANTERO MIDSTREAM COM 03676B102 6,759,644 10,664 0.16 36,299 5.46 0.0025
2020-08-14 2020-06-30 13F ANTERO MIDSTREAM COM 03676B102 6,748,980 -177,394 -2.56 34,420 136.64 0.0025
2020-06-19 2020-03-31 13F/A-1 ANTERO MIDSTREAM COM 03676B102 6,926,374 760,913 12.34 14,545 -68.92 0.0013
2020-05-11 2020-03-31 13F ANTERO MIDSTREAM COM 03676B102 6,926,374 760,913 14,545 1,277.3439
2020-02-06 2019-12-31 13F ANTERO MIDSTREAM COM 03676B102 6,165,461 545,942 9.72 46,796 12.53 0.0032
2019-11-14 2019-09-30 13F ANTERO MIDSTREAM COM 03676B102 5,619,519 2,856,723 103.40 41,584 31.34 0.0031
2019-08-14 2019-06-30 13F ANTERO MIDSTREAM COM 03676B102 2,762,796 2,512,362 1,003.20 31,662 817.47 0.0024
2019-05-15 2019-03-31 13F ANTERO MIDSTREAM COM 03676B102 250,434 139,724 126.21 3,451 178.76 0.0003
2019-02-12 2018-12-31 13F ANTERO MIDSTREAM GP COM SHS REPSTG 03675Y103 110,710 -7,301 -6.19 1,238 -38.01 0.0001
2018-11-09 2018-09-30 13F ANTERO MIDSTREAM GP Common equity shares 03675Y103 118,011 10,600 9.87 1,997 -1.48 0.0002
2018-08-14 2018-06-30 13F ANTERO MIDSTREAM GP Common equity shares 03675Y103 107,411 38,400 55.64 2,027 83.77 0.0002
2018-05-15 2018-03-31 13F ANTERO RES MIDSTRM MGMT Common equity shares 03675Y103 69,011 33,650 95.16 1,103 58.02 0.0001
2018-02-14 2017-12-31 13F ANTERO RES MIDSTRM MGMT Common equity shares 03675Y103 35,361 27,830 369.54 698 194.51 0.0001
2018-02-14 2017-12-31 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 9,351 1,820 272 0.0000
2017-11-14 2017-09-30 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 7,531 100 1.35 237 -4.05 0.0000
2017-08-14 2017-06-30 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 7,431 -1,621 -17.91 247 -17.67 0.0000
2017-05-15 2017-03-31 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 9,052 400 4.62 300 12.36 0.0000
2017-02-09 2016-12-31 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 8,652 8,652 267 0.0000
2016-08-12 2016-06-30 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 0 -30,175 -100.00 0 -100.00
2016-05-20 2016-03-31 13F/A-1 ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 30,175 1,180 4.07 667 0.76 0.0001
2016-05-12 2016-03-31 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 30,175 667
2016-02-16 2015-12-31 13F ANTERO MIDSTREAM PARTNERS Limited Partnership 03673L103 28,995 28,995 662 0.0001
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.