13D Filing: Carlson Capital and Renewable Energy Group Inc. (REGI)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 2)*

Renewable
Energy Group, Inc.

(Name of Issuer)

Common Stock, $0.0001 par value per share

(Title of Class of Securities)

75972A301

(CUSIP Number)

Carlson Capital, L.P.

Attn: Joe Brucchieri

2100 McKinney Avenue

Dallas, TX 75201

(214)
932-9600

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

June 30, 2017

(Date of
Event Which Requires Filing of This Statement)

If the filing person has
previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13D-1(e), rule 13d-1(f) or Rule 13d-1(g), check the following box.  ☐

*	The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (the Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).