13G Filing: Carlson Capital and Archrock Inc. (AROC)

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Item 1(a).

NAME OF ISSUER

Archrock, Inc. (the Issuer).

Item 1(b).

ADDRESS OF ISSUERS PRINCIPAL EXECUTIVE OFFICES

16666 Northchase Drive

Houston, TX 77060

Item 2(a).

NAME OF PERSON FILING

This statement is filed by:

(i) Carlson Capital L.P., a Delaware limited partnership (Carlson Capital), which serves as the investment manager to certain
investment funds (the Funds) and managed accounts (collectively, the Accounts) with respect to any shares of Common Stock of the Issuer held by the Funds or the Accounts, if any;

(ii) Asgard Investment Corp. II, a Delaware corporation (Asgard II), which serves as the general partner of Carlson Capital, with
respect to the Common Stock directly held by the Funds or the Accounts;

(iii) Asgard Investment Corp., a Delaware corporation
(Asgard), which is the sole stockholder of Asgard II, with respect to the Common Stock directly held by the Funds or the Accounts; and

(iv) Mr. Clint D. Carlson, a United States citizen (Mr. Carlson), who serves as president of Asgard, Asgard II and
Carlson Capital, with respect to the Common Stock directly held by the Funds or the Accounts.

The foregoing persons are hereinafter
sometimes collectively referred to as the Reporting Persons.

The filing of this statement should not be construed as an
admission that any of the Reporting Persons is, for the purposes of Section 13 of the Act, the beneficial owner of the Common Stock reported herein.

Item 2(b).

ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE

The address of the
principal business office of each of the Reporting Persons is 2100 McKinney Avenue, Suite 1800, Dallas, Texas 75201.

Item 2(c).

CITIZENSHIP

Carlson Capital is a Delaware limited partnership. Each of Asgard and
Asgard II is a Delaware corporation. Mr. Carlson is a United States citizen.

Item 2(d).

TITLE OF CLASS OF SECURITIES

Common Stock, par value $0.01 per share (the Common
Stock).

Item 2(e).

CUSIP No.

03957W106

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