13D Filing: MAST Capital and Great Elm Capital Corp. (GECC)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE
13D/A

Under the Securities Exchange Act of 1934

(Amendment No. 1)

Great Elm
Capital Corp.

(Name of Issuer)

Common Stock, $0.01 Par Value

(Title of Class of Securities)

390320109

(CUSIP Number)

MAST Capital Management, LLC

200 Clarendon Street, 51^st Floor

Boston, MA 02116

(617)
375-3019

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

May 8, 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 which is the subject of this Schedule 13D, and is filing this schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following
box.  ☐

The information required on 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 (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).