[Form 3] Antero Midstream Corporation Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Justin J. Agnew, Chief Financial Officer and Vice President - Finance & Investor Relations of Antero Midstream Corporation (AM), reported beneficial ownership of 191,743 shares of common stock in an initial Form 3 filed for the 08/14/2025 event. The total includes 66,648 shares subject to unvested restricted stock units. No derivative securities were reported. The filing was signed on behalf of Mr. Agnew on 08/25/2025.

Positive

• Initial disclosure filed establishing baseline insider ownership for regulatory transparency
• 191,743 shares reported with explicit breakdown including 66,648 RSUs
• Reporting person identified as Chief Financial Officer and Vice President - Finance & Investor Relations

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine initial Section 16 disclosure showing officer ownership and outstanding restricted stock units.

This Form 3 documents the initial beneficial ownership of a senior executive. It discloses 191,743 shares, including 66,648 unvested RSUs, and identifies the reporting person as the company's CFO and VP of Finance & Investor Relations. The filing contains no derivative positions and includes a power of attorney signature. As an initial ownership statement, it provides transparency on insider alignment with equity-based compensation.

Securities Analyst

TL;DR: Disclosure is factual and routine; the position size is material for insider monitoring but not a market-moving event on its own.

The report confirms direct ownership of 191,743 common shares and specifies that 66,648 of those are restricted stock units subject to vesting. There are no reported options, warrants, or other derivative instruments. This provides a clear baseline for future Section 16 reporting of transactions by this officer.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Agnew Justin J.

(Last) (First) (Middle)

1615 WYNKOOP STREET

(Street)

DENVER CO 80202

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
08/14/2025

3. Issuer Name and Ticker or Trading Symbol
Antero Midstream Corp [ AM ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	See Remarks

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common stock, par value $0.01 per share	191,743(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Includes 66,648 shares of common stock of Antero Midstream Corporation subject to previously granted restricted stock unit awards that remain subject to vesting.

Remarks:

Chief Financial Officer and Vice President - Finance & Investor Relations. Exhibit 24 - Power of Attorney.

	/s/ Yvette K. Schultz, as attorney-in-fact for Justin J. Agnew	08/25/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What number of Antero Midstream (AM) shares does Justin J. Agnew report owning?

The filing reports 191,743 shares of common stock beneficially owned.

How many of the reported AM shares are restricted stock units?

66,648 shares are subject to previously granted restricted stock unit awards and remain subject to vesting.

Does the Form 3 report any derivative securities for Justin J. Agnew?

No. The filing shows no derivative securities (options, warrants, puts or calls) reported.

What is Justin J. Agnew's role at Antero Midstream as stated in the filing?

He is listed as Chief Financial Officer and Vice President - Finance & Investor Relations and as an officer of the issuer.

When was the event date and when was the Form 3 signed?

The event requiring the statement is 08/14/2025 and the form was signed by attorney-in-fact on 08/25/2025.