8-K: Antero Midstream Upsizes Senior Notes to $600M for HG Energy II Acquisition

Antero Midstream Partners and Antero Midstream Finance Corporation successfully completed a private placement of $600 million in 5.750% Senior Notes due 2034 to fund the HG Energy II Midstream Holdings acquisition.

Summary

• Antero Midstream Partners LP and Antero Midstream Finance Corporation (the Issuers) completed a private placement of $600.0 million aggregate principal amount of 5.750% Senior Notes due 2034.
• The offering size was upsized from an initial $500.0 million aggregate principal amount.
• Net proceeds from the offering, along with borrowings under Antero Midstream Partners' revolving credit facility and net proceeds from the disposition of Utica Shale midstream assets, will be used to fund the acquisition of HG Energy II Midstream Holdings, LLC (the HG Acquisition) and related fees and expenses.
• A special mandatory redemption clause requires the Issuers to redeem all outstanding Notes at 100% of the initial issue price plus accrued and unpaid interest if the HG Acquisition does not close by June 2, 2026 (or September 2, 2026, if extended), or if the purchase agreement is terminated, or if the Issuers determine the acquisition will not close.
• The Notes are guaranteed, jointly and severally, on a senior unsecured basis by Antero Midstream Corporation and certain of its existing and future wholly-owned domestic subsidiaries (excluding Finance Corp.).
• The Notes and Guarantees rank equally in right of payment with all existing and future senior unsecured indebtedness but are effectively subordinated to secured debt and structurally subordinated to liabilities of non-guaranteeing subsidiaries.

Sentiment

Score: 7

Explanation: The successful upsizing and completion of a significant debt offering to fund a strategic acquisition is generally positive, demonstrating market confidence and enabling growth. However, the inherent risks associated with the acquisition's closing and the subordination of the notes temper the overall sentiment.

Positives

• The private placement was upsized from an initial $500.0 million to $600.0 million, indicating strong market demand and successful capital raise.
• The offering secures significant funding for the strategic acquisition of HG Energy II Midstream Holdings, LLC, which is expected to enhance the company's midstream asset portfolio and strategic position.

Negatives

• The Notes are effectively subordinated in right of payment to all existing and future secured debt of the Issuers and Guarantors, including debt under Antero Midstream Partners' revolving credit agreement, to the extent of the value of the assets securing such debt.
• The Notes are structurally subordinated to all liabilities of the company's subsidiaries (including Antero Midstream Partners' subsidiaries other than Finance Corp.) that do not guarantee the Notes.
• The special mandatory redemption clause introduces a risk of early redemption at 100% of the initial issue price plus accrued interest if the HG Acquisition fails to close, potentially limiting upside for noteholders who might prefer to hold the notes to maturity.

Risks

• Acquisition Failure Risk: If the HG Acquisition does not close by the Special Mandatory Redemption Outside Date (June 2, 2026, or September 2, 2026, if extended), or if the HG Purchase Agreement is terminated, the Issuers are required to redeem all outstanding Notes at 100% of the initial issue price plus accrued interest.
• Subordination Risk: The Notes and Guarantees are effectively subordinated in right of payment to all existing and future secured debt of the Issuers and Guarantors, including debt under Antero Midstream Partners' revolving credit agreement, to the extent of the value of the assets securing such debt.
• Structural Subordination Risk: The Notes and Guarantees are structurally subordinated to all liabilities of the company's subsidiaries (including Antero Midstream Partners' subsidiaries other than Finance Corp.) that do not guarantee the Notes.
• Change of Control Risk: Upon a Change of Control, Antero Midstream Partners may be required to offer to purchase the Notes at a purchase price equal to 101% of the principal amount plus accrued and unpaid interest.
• Asset Sale Risk: If aggregate Excess Proceeds from Asset Sales exceed $50.0 million, Antero Midstream Partners may be required to make an Asset Sale Offer to purchase Notes at 100% of the principal amount plus accrued and unpaid interest.

Future Outlook

The company intends to use the net proceeds from this debt offering, along with other financing, to fund the acquisition of HG Energy II Midstream Holdings, LLC. This strategic acquisition is a key future step for Antero Midstream, aiming to expand its midstream operations, while also involving the disposition of Utica Shale midstream assets.

Management Comments

• Justin J. Agnew, Chief Financial Officer, Vice President Finance and Investor Relations, signed the report on behalf of Antero Midstream Corporation.

Industry Context

This debt offering and the planned acquisition of HG Energy II Midstream Holdings, LLC indicate Antero Midstream's continued strategic activity within the U.S. midstream energy sector. The sector often sees consolidation and asset optimization efforts, such as the disposition of Utica Shale assets, as companies seek to enhance their operational footprint and efficiency in key basins.

Corporate Governance

Related Party Transactions

• The Membership Interest Purchase Agreement, dated December 5, 2025, for the HG Acquisition is by and among Antero Midstream Partners, Antero Resources Corporation, HG Energy II LLC, HG Energy II Production Holdings LLC, and HG Energy II Midstream Holdings LLC.
• Antero Midstream Corporation, the general partner of Antero Midstream Partners LP, is a Guarantor of the Notes.

Stakeholder Impact

• Shareholders: Potential for future equity dilution if the company uses equity offerings to redeem notes, and the overall financial performance will be impacted by the success of the HG Acquisition.
• Noteholders: Benefit from a fixed interest rate (5.750%) and senior unsecured guarantees, but face risks from effective subordination to secured debt and structural subordination to non-guaranteeing subsidiaries. They also have specific redemption rights and obligations related to the HG Acquisition, Change of Control, and Asset Sales.
• Creditors (Secured): Their position remains superior to the new noteholders due to the effective subordination of the notes.

Next Steps

• Completion of the HG Energy II Midstream Holdings, LLC acquisition.

Key Dates

Keywords

Antero Midstream, Senior Notes, Debt Offering, Private Placement, HG Energy II Acquisition, Midstream Energy, Capital Raise, Corporate Finance, SEC 8-K, Fixed Income