EXHIBIT 4.5

NOTICE OF GUARANTEED DELIVERY

This form, or one substantially equivalent to this form, must be used to exercise the non-transferable subscription rights (the “Rights”) to subscribe for and purchase shares of common stock, par value $0.0005 per share (the “Common Stock”) of ARC Group Worldwide, Inc., a Utah corporation (the “Company”) pursuant to the rights offering (the “Rights Offering”) described and provided for in the Company’s prospectus, dated [•], 2018 (the “Prospectus”), if a holder of Rights cannot deliver the subscription rights certificate(s) evidencing the Rights (the “Subscription Rights Certificate(s)”) to Broadridge Corporate Issuer Solutions, Inc., the subscription agent for the Rights Offering (the “Subscription Agent”) at or prior to 5:00 p.m., Eastern Standard Time, on [•], 2018, unless extended by the Company (the “Expiration Date”). This Notice of Guaranteed Delivery must be received by the Subscription Agent on or prior to the Expiration Date.

Payment of the subscription price of $[•] per share (the “Subscription Price”) for each share of Common Stock subscribed for upon exercise of such Rights must be received by the Subscription Agent in the manner specified in the Prospectus prior to 5:00 p.m., Eastern Time, on the Expiration Date, even if the Rights Certificate(s) evidencing such Rights is being delivered pursuant to the Guaranteed Delivery Procedures hereof. The Subscription Rights Certificate evidencing the Rights must be received by the Subscription Agent within two (2) business days following the date you submit your Notice of Guaranteed Delivery.

The address of the Subscription Agent is as follows:

The Subscription Agent’s telephone number is: +1 (855)-793-5068.

DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE DOES NOT CONSTITUTE A VALID DELIVERY.

Any questions regarding the Company’s Rights Offering or requests for additional copies of documents may be directed to Broadridge Corporate Issuer Solutions, Inc. at 855-793-5068 (toll free), Monday through Friday (except bank holidays), between 9 a.m. and 6 p.m., Eastern Time.

Ladies and Gentlemen:

The undersigned hereby represents that he or she is the holder of Subscription Rights Certificate(s) representing Rights issued by ARC Group Worldwide, Inc. and that such Subscription Rights Certificate(s) cannot be delivered to the Subscription Agent at or before 5:00 p.m., Eastern Standard Time, on the Expiration Date. Upon the terms and subject to the conditions set forth in the Prospectus, receipt of which is hereby acknowledged, the undersigned hereby elects to exercise the following Rights, pursuant to the Basic Subscription Right and the Over-Subscription Right as described in the Prospectus:

The undersigned understands that payment of the Subscription Price of $[•] per share for each share of Common Stock subscribed pursuant to the Basic Subscription Right and the Over-Subscription Right must be received by the Subscription Agent at or before 5:00 p.m., Eastern Standard Time, on the Expiration Date and represents that such payment, in the aggregate amount set forth above, either (check appropriate box):

o  is being delivered to the Subscription Agent herewith; or

o  has been delivered separately to the Subscription Agent, and is or was delivered in the manner set forth below (check appropriate box and complete information relating thereto):

o  cashier’s or certified bank check

o  bank draft

o  U.S. Postal money order

o  wire transfer of immediately available funds

If by cashier’s or certified bank check, bank draft, or express money order, please provide the following information:

GUARANTEE OF DELIVERY

(Not to Be Used for Subscription Rights Certificate Signature Guarantee)

The undersigned, a member firm of a registered national securities exchange or of the Financial Industry Regulatory Authority, or a commercial bank or trust company having an office or correspondent in the United States, or a bank, stockbroker, savings and loan association or credit union with membership in an approved signature guarantee medallion program, pursuant to Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended, guarantees that the undersigned will deliver to the Subscription Agent the certificates representing the Rights being exercised hereby, with any required signature guarantee and any other required documents, all within two (2) business days after the date hereof.

The institution that completes this form must communicate the guarantee to the Subscription Agent and must deliver the Subscription Rights Certificate(s) to the Subscription Agent within the time period shown in the Prospectus. Failure to do so could result in a financial loss to such institution.