As filed with the U.S. Securities and Exchange Commission on July 15, 2026.

Registration No. 333-291302

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

AMENDMENT NO. 3

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

ARC Group Securities Acquisition I

(Exact name of registrant as specified in its charter)

Cayman Islands

6770

N/A

(State or other jurisdiction of

incorporation or organization)

(Primary Standard Industrial

Classification Code Number)

(I.R.S. Employer

Identification Number)

398 Mill Avenue, Suite 306

Tempe, Arizona 85281

Telephone: (928) 625-0928

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Ian Hanna

Chief Executive Officer

398 Mill Avenue, Suite 306

Tempe, Arizona 85281

Telephone: (928) 625-0928

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Joseph M. Lucosky, Esq.

Lawrence Metelitsa, Esq.

Lucosky Brookman LLP
101 Wood Avenue South, 5^th Floor

Woodbridge, New Jersey 08830
(732) 395-4400

Tom McLaughlin

Mourant Ozannes (Cayman) LLP

94 Solaris Avenue, Camana Bay

PO Box 1348

Grand Cayman KY1-1108

Cayman Islands

+1 345 949 4123

Ying Li, Esq.

Sally Yin, Esq.

Hunter Taubman Fischer & Li LLC

950 Third Avenue, 19^th Floor

New York, NY 10022

(212) 530-2206

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box. ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
		Emerging growth company	☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

EXPLANATORY NOTE

ARC Group Securities Acquisition I is filing this Amendment No. 3 (this “Amendment”) to the Registration Statement on Form S-1 (File No. 333-291302) (the “Registration Statement”) as an exhibits-only filing to file Exhibit 5.2, and to amend and restate the exhibit index set forth in Part II of the Registration Statement. Accordingly, this Amendment does not contain copies of the prospectus included in the Registration Statement, which remains unchanged to the Registration Statement filed on June 29, 2026, and consists only of the cover page, this explanatory note and Part II of the Registration Statement. The remainder of the Registration Statement is unchanged and has been omitted.

Part II

Information not required in prospectus

Item 13. Other Expenses of Issuance and Distribution.

The estimated expenses payable by us in connection with the offering described in this registration statement (other than the underwriting discount and commissions) will be as follows:

Legal fees and expenses		225,000
Printing and engraving expenses		30,000
SEC/FINRA expenses		50,000
Nasdaq listing fees		80,000
Underwriter Legal Fees		100,000
Miscellaneous		215,000
Total	$	700,000

Item 14. Indemnification of Directors and Officers.

Cayman Islands law does not limit the extent to which a company’s memorandum and articles of association may provide for indemnification of officers and directors, except to the extent any such provision may be held by the Cayman Islands courts to be contrary to public policy, such as to provide indemnification against willful default, willful neglect, actual fraud or the consequences of committing a crime. Our amended and restated memorandum and articles of association will provide for indemnification of our officers and directors to the maximum extent permitted by law, including for any liability incurred in their capacities as such, except through their own actual fraud, willful default or willful neglect. We expect to purchase a policy of directors’ and officers’ liability insurance that insures our officers and directors against the cost of defense, settlement or payment of a judgment in some circumstances and insures us against our obligations to indemnify our officers and directors.

Our officers and directors have agreed to waive any right, title, interest or claim of any kind in or to any monies in the trust account, and have agreed to waive any right, title, interest or claim of any kind they may have in the future as a result of, or arising out of, any services provided to us and will not seek recourse against the trust account for any reason whatsoever (except to the extent they are entitled to funds from the trust account due to their ownership of public shares). Accordingly, any indemnification provided will only be able to be satisfied by us if (i) we have sufficient funds outside of the trust account or (ii) we consummate an initial business combination.

We believe that these provisions, the insurance and the indemnity agreements are necessary to attract and retain talented and experienced officers and directors.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers or persons controlling us pursuant to the foregoing provisions, we have been informed that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

We will enter into indemnity agreements with each of our officers and directors to provide contractual indemnification in addition to the indemnification provided for in our amended and restated memorandum and articles of association, a form of which is to be filed as an exhibit to this Registration Statement. These agreements will require us to indemnify these individuals to the fullest extent permitted under Cayman Islands law and to advance expenses incurred as a result of any proceeding against them as to which they could be indemnified.

Pursuant to the Underwriting Agreement to be filed as Exhibit 1.1 to this Registration Statement, we have agreed to indemnify the underwriters and the underwriters have agreed to indemnify us against certain civil liabilities that may be incurred in connection with this offering, including certain liabilities under the Securities Act.

Item 15. Recent Sales of Unregistered Securities.

On October 17, 2025, our sponsor purchased, and the Company issued to the sponsor, 7,392,857 Class B ordinary shares for an aggregate purchase price of $25,000, of which 964,286 Class B ordinary shares are subject to forfeiture in the event the over-allotment option is not exercised. On May 6, 2026, our sponsor surrendered 2,217,857 Class B ordinary shares it held for no consideration, leaving sponsor with 5,175,000 Class B ordinary shares (up to 675,000 of which are subject to forfeiture by the holders thereof depending on the extent to which the underwriter’s over-allotment option is exercised). The sponsor is deemed to have purchased the founder shares for approximately $0.00483 (if over-allotment option is exercised) per share. Such securities were issued in connection with our organization pursuant to the exemption from registration contained in Section 4(a)(2) of the Securities Act. The number of founder shares outstanding was determined based on the expectation that the total size of this offering would be a maximum of 12,075,000 units if the underwriters’ over-allotment option is exercised in full and therefore that such founder shares would represent 30% of the outstanding shares after this offering (not including the Class A ordinary shares that are included within the private units). Up to 675,000 of these shares will be surrendered for no consideration depending on the extent to which the underwriters’ over-allotment is exercised.

Our sponsor is an accredited investor for purposes of Rule 501 of Regulation D. Each of the equity holders in our sponsor is an accredited investor under Rule 501 of Regulation D. The sole business of our sponsor is to act as the company’s sponsor in connection with this offering.

Our sponsor has committed, pursuant to a written agreement, to purchase from us an aggregate of 140,000 private units (whether or not the over-allotment option is exercised) at $10.00 per unit, for an aggregate purchase price of $1,400,000. The private units will also be worthless if we do not complete our initial business combination. This purchase will take place on a private placement basis simultaneously with the completion of our initial public offering. This issuance will be made pursuant to the exemption from registration contained in Section 4(a)(2) of the Securities Act.

No underwriting discounts or commissions were paid with respect to such sales.

Item 16. Exhibits and Financial Statement Schedules.

Exhibit Index

Exhibit No.
1.1**		Form of Underwriting Agreement.
3.1**		Memorandum and Articles of Association.
3.2**		Form of Amended and Restated Memorandum and Articles of Association.
4.1**		Specimen Unit Certificate.
4.2**		Specimen Ordinary Share Certificate.
4.3**		Specimen Warrant Certificate (included as an exhibit to Exhibit 4.4).
4.4**		Form of Warrant Agreement between Efficiency, INC. and the Registrant.
4.5**		Specimen Right Certificate.
4.6**		Form of Rights Agreement between Efficiency, INC. and the Registrant.
5.1**		Opinion of Lucosky Brookman LLP.
5.2*		Opinion of Mourant Ozannes (Cayman) LLP, Cayman Islands counsel to the Registrant.
10.1**		Form of Letter Agreement among the Registrant, FDB I and each of the officers and directors of the Registrant.
10.2**		Form of Investment Management Trust Agreement between Efficiency INC. and the Registrant.
10.3**		Form of Registration Rights Agreement among the Registrant, FDB I and ARC Group Securities LLC.
10.4**		Form of Private Units Purchase Agreement between the Registrant and FDB I.
10.5**		Form of Indemnity Agreement.
10.6**		Promissory Note dated October 16, 2025, issued to FDB I.
10.7**		Subscription Agreement dated October 16, 2025, between FDB I and the Registrant.
10.8**		Form of Administrative Services Agreement.
10.9**		Amendment to Subscription Agreement dated October 29, 2025, between FDB I and the Registrant.
10.10**		Founder Shares Forfeiture Agreement dated May 6, 2026, between FDB I and the Registrant.
14.1**		Form of Code of Ethics.
23.1**		Consent of Marcum Asia CPAs LLP.
23.2**		Consent of Lucosky Brookman LLP (included on Exhibit 5.1).
23.3*		Consent of Mourant Ozannes (Cayman) LLP (included on Exhibit 5.2).
24.1**		Power of Attorney (included on the signature page of the initial filing).
99.1**		Audit Committee Charter.
99.2**		Compensation Committee Charter.
99.3**		Consent of Daniel A. Mace to be named as a director nominee.
99.4**		Consent of Patrik Hriczo to be named as a director nominee.
99.5**		Consent of Jennifer Goforth to be named as a director nominee.
107**		Filing Fee Table.

* Filed herewith.

** Previously filed.

Item 17. Undertakings.

(a)	The undersigned registrant hereby undertakes to provide to the underwriters at the closing specified in the underwriting agreement, certificates in such denominations and registered in such names as required by the underwriters to permit prompt delivery to each purchaser.

(b)

Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

(c)	The undersigned registrant hereby undertakes that:

(1)

For purposes of determining any liability under the Securities Act of 1933, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective.

(2)

For the purpose of determining any liability under the Securities Act of 1933, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3)

For the purpose of determining liability under the Securities Act of 1933 of any purchaser, if the registrant is subject to Rule 430C, each prospectus filed pursuant to Rule 424(b) as part of a registration statement relating to an offering, other than registration statements relying on Rule 430B or other than prospectuses filed in reliance on Rule 430A, shall be deemed to be part of and included in the registration statement as of the date it is first used after effectiveness. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such first use, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such date of first use.

(4)

For the purpose of determining liability of a registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of an undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(i)	any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

(ii)	any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by an undersigned registrant;

(iii)

the portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

(iv)	any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

(d)	The undersigned registrant hereby undertakes:

(1)	To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

(i)	To include any prospectus required by section 10(a)(3) of the Securities Act of 1933;

(ii)	To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Securities and Exchange Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20% change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement.

(iii)	To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;

(2)	That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3)	To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(4)	That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:

(i)	If the registrant is relying on Rule 430B:

(A)	Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and

(B)	Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date; or

(ii)

If the registrant is subject to Rule 430C, each prospectus filed pursuant to Rule 424(b) as part of a registration statement relating to an offering, other than registration statements relying on Rule 430B or other than prospectuses filed in reliance on Rule 430A, shall be deemed to be part of and included in the registration statement as of the date it is first used after effectiveness. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such first use, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such date of first use.

(5)

That, for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(i)	Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

(ii)	Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;

(iii)	The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

(iv)	Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Tempe, Arizona, on the 15th day of July, 2026.

	ARC Group Securities Acquisition I

	By:	/s/ Ian Hanna
	Name:	Ian Hanna
	Title:	Chief Executive Officer and Chairman of the Board

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Name	Position	Date

/s/ Ian Hanna	Chief Executive Officer and Chairman of the Board	July 15, 2026
Ian Hanna	(principal executive officer)

/s/ Jake Carney	Chief Financial Officer	July 15, 2026
Jake Carney	(principal financial and accounting officer)

Authorized representative

Pursuant to the requirements of Section 6(a) of the Securities Act of 1933, the undersigned has signed this registration statement, solely in its capacity as the duly authorized representative of ARC Group Securities Acquisition I, in Tempe, Arizona, on the 15th day of July, 2026.

	By:	/s/ Ian Hanna
	Name:	Ian Hanna
	Title:	Chief Executive Officer

ARC Group Securities Acquisition I S-1/A