13G Filing: Becker Drapkin Management and ARC Group WorldWide Inc (ARCW)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.     )*

ARC GROUP
WORLDWIDE, INC.

(Name of Issuer)

Common Stock

(Title of
Class of Securities)

00213H105

(CUSIP Number)

April 19,
2017

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒
Rule 13d-1(c)

☐ Rule 13d-1(d)

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, as amended (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).

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

Taylor H. Wilson, Esq.

Haynes and Boone, LLP

2323 Victory
Avenue, Suite 700

Dallas, Texas 75219

(214) 651-5000

ARC Group Worldwide, Inc.

810 Flightline Blvd. Deland,
Florida 32724

This statement is jointly filed by and on behalf of each of
Northern Right Capital Management, L.P. (Northern Right Management), Northern Right Capital (QP), L.P. (Northern Right QP), BC Advisors, LLC (BCA), and Matthew A. Drapkin (Mr. Drapkin, and
together with Northern Right Management, Northern Right QP, and BCA, the Reporting Persons).

Northern Right QP has the power
to vote or to direct the vote of (and the power to dispose or direct the disposition of) the shares of common stock of the Issuer (the Common Stock) owned by it (the Northern Right QP Shares).

As general partner and investment manager of Northern Right QP, Northern Right Management may be deemed to have the shared power to vote or
direct the vote of (and the shared power to dispose or direct the disposition of) the Northern Right QP Shares. Northern Right Management does not own any Common Stock directly and disclaims beneficial ownership of the Northern Right QP Shares.

As general partner of Northern Right Management, BCA may be deemed to have the shared power to vote or direct the vote of (and the shared
power to dispose or direct the disposition of) any Common Stock beneficially owned by Northern Right Management. BCA does not own any Common Stock directly and disclaims beneficial ownership of any Common Stock beneficially owned by Northern Right
Management.

As a member of BCA and pursuant to the operating agreement of BCA, Mr. Drapkin may be deemed to have the shared power to
vote or direct the vote of (and the shared power to dispose or direct the disposition of) any Common Stock beneficially owned by BCA. Mr. Drapkin disclaims beneficial ownership of any Common Stock beneficially owned by BCA.

Each Reporting Person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such
person is, for the purposes of Section 13(d) or 13(g) of the Act, the beneficial owner of any securities covered by this statement.

The address of the
principal business office of each of Northern Right Management, Northern Right QP, BCA and Mr. Drapkin is 10 Corbin Drive, 3^rd Floor, Darien, Connecticut 06820.

See Item 4 on the cover page(s) hereto.

Common Stock

00213H105

If filing as a non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J), please specify the type of institution:

If this statement is being filed to
report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  ☐.

Not Applicable.

Not Applicable.

Not Applicable.

Not Applicable.

By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a
participant in any transaction having that purpose or effect other than activities solely in connection with a nomination under §240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true,
complete and correct.

EXHIBIT INDEX