# EDGAR Filing Document

**Accession Number:** 0002083910
**File Stem:** 0001437749-26-001800
**Filing Date:** 2026-1
**Character Count:** 43575
**Document Hash:** 7fbdcd0c57299629a7c2e0890aeab261
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001437749-26-001800.hdr.sgml**: 20260122

**ACCESSION NUMBER**: 0001437749-26-001800

**CONFORMED SUBMISSION TYPE**: S-1MEF

**PUBLIC DOCUMENT COUNT**: 17

**FILED AS OF DATE**: 20260122

**DATE AS OF CHANGE**: 20260122

**EFFECTIVENESS DATE**: 20260122

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Archimedes Tech SPAC Partners III Co.
- **CENTRAL INDEX KEY:** 0002083910
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-1MEF
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-292891
- **FILM NUMBER:** 26553176

**BUSINESS ADDRESS:**
- **STREET 1:** 2093 PHILADELPHIA PIKE 1968
- **CITY:** CLAYMONT
- **STATE:** DE
- **ZIP:** 19703
- **BUSINESS PHONE:** 619-719-1810

**MAIL ADDRESS:**
- **STREET 1:** 2093 PHILADELPHIA PIKE 1968
- **CITY:** CLAYMONT
- **STATE:** DE
- **ZIP:** 19703

**As filed with the U.S. Securities and Exchange Commission on January 22, 2026.**

**Registration No. 333-**

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**UNITED STATES**<br> **SECURITIES AND EXCHANGE COMMISSION**<br> **Washington, D.C. 20549**

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**FORM S-1**<br> **REGISTRATION STATEMENT**<br> **UNDER**<br> **THE SECURITIES ACT OF 1933**

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**Archimedes Tech SPAC Partners III Co.**<br> (Exact name of registrant as specified in its charter)

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| | | |
|:---|:---|:---|
| **Cayman Islands** | **6770** | **N/A** |
| (State or other jurisdiction of<br> incorporation or organization) | (Primary Standard Industrial<br> Classification Code Number) | (I.R.S. Employer<br> Identification Number) |

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**Long Long**<br> **Chief Executive Officer**<br> **Archimedes Tech SPAC Partners III Co.**

**2093 Philadelphia Pike #1968**

**Claymont, DE 19703**

**(725) 312-2430**

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

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***Copies to:***

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| | | |
|:---|:---|:---|
| **Mitchell S. Nussbaum**<br> **Giovanni Caruso**<br> **Loeb & Loeb LLP**<br> **345 Park Avenue**<br> **New York, NY 10154**<br> **Tel: (212) 407-4000** | **Andrew Barker**<br> **Walkers (Cayman) LLP**<br> **190 Elgin Avenue**<br> **George Town**<br> **Grand Cayman KY1-9001**<br> **Cayman Islands** | **Joel L. Rubinstein**<br> **Daniel E. Nussen**<br> **White & Case LLP**<br> **1221 Avenue of the Americas**<br> **New York, NY 10020**<br> **Tel: (212) 819-8200** |

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**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. ☒ 333-292419

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 ☐ <br> Non-accelerated filer ☒ Smaller reporting company ☒ <br> 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. ☐

**This Registration Statement shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(b) under the Securities Act of 1933, as amended.**

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**EXPLANATORY NOTE**

This Registration Statement on Form S-1 (this "Registration Statement") is being filed by Archimedes Tech SPAC Partners III Co., a blank check company incorporated as a Cayman Islands exempted company (the "Registrant"), pursuant to Rule 462(b) under the Securities Act of 1933, as amended, and General Instruction V to Form S-1. This Registration Statement relates to the Registrant's Registration Statement on Form S-1, as amended (File No. 333-292419), initially filed by the Registrant on December 23, 2025 and declared effective by the Securities and Exchange Commission (the "Commission") on January 22, 2026 (the "Prior Registration Statement").

This Registration Statement covers the registration of an additional 4,600,000 of the Registrant's units, each consisting of one ordinary share and one-fourth of one redeemable warrant. Each whole warrant entitles the holder thereof to purchase one ordinary share at a price of $11.50 per share, subject to adjustment. The required opinions of counsel and related consents and accountant's consent are attached hereto and filed herewith. Pursuant to Rule 462(b), the contents of the Prior Registration Statement, including the exhibits thereto, are incorporated by reference into this Registration Statement.

**CERTIFICATION**

The Registrant hereby certifies to the Commission that (1) it has instructed its bank to pay the filing fee set forth in Exhibit 107 filed herewith by a wire transfer of such amount to the Commission's account at U.S. Bank as soon as practicable (but no later than the close of business as of January 23, 2026), (2) it will not revoke such instructions, (3) it has sufficient funds in the relevant account to cover the amount of such filing fee and (4) it will confirm receipt of such instructions by its bank during regular business hours no later than January 23, 2026.

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**PART II**

**INFORMATION NOT REQUIRED IN PROSPECTUS**

**ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) ***Exhibits.*** All exhibits filed with or incorporated by reference in the Registration Statement on Form S-1 (File No. 333-292419) are incorporated by reference into, and shall be deemed a part of, this Registration Statement, and the following additional exhibits are filed herewith, as part of this Registration Statement:

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| | |
|:---|:---|
| **Exhibit** | **Description** |
| 5.1 | [Opinion of Walkers (Cayman) LLP](ex_911142.htm) |
| 5.2 | [Opinion of Loeb & Loeb LLP](ex_911143.htm) |
| 23.1 | [Consent of WithumSmith+Brown, PC](ex_911144.htm) |
| 23.2 | [Consent of Walkers (Cayman) LLP (included in Exhibit 5.1)](ex_911142.htm) |
| 23.3 | [Consent of Loeb & Loeb LLP (included in Exhibit 5.2)](ex_911143.htm) |
| 99.1 | [Power of Attorney (included on signature page to this Registration Statement)](#poa) |
| 107.1 | [Filing Fee Table](ex_911145.htm) |

---

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**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 the City of Claymont, State of Delaware, on the 22nd day of January, 2026.

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| | |
|:---|:---|
| **Archimedes Tech SPAC Partners III Co.** | **Archimedes Tech SPAC Partners III Co.** |
| By: | /s/ Long Long |
| Name: | Long Long |
| Title: | Chief Executive Officer |

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**POWER OF ATTORNEY**

Each of the undersigned constitutes and appoints Long Long his or her true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for such person and in his or her name, place and stead, in any and all capacities, to sign this Registration Statement on Form S-1 (including all pre-effective and post-effective amendments and registration statements filed pursuant to Rule 462 under the Securities Act of 1933), and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, each acting alone, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as she might or could do in person, hereby ratifying and confirming that any such attorney-in-fact and agent, or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

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.

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| | | |
|:---|:---|:---|
| **Name** | **Position** | **Date** |
| /s/ Long Long | Chief Executive Officer | January 22, 2026 |
| Long Long | (principal executive officer) |  |
| /s/ Ming (K.M.) Chan | Chief Financial Officer | January 22, 2026 |
| Ming (K.M.) Chan | (principal financial and accounting officer) |  |
| /s/ Eric R. Ball | Chairman of the Board | January 22, 2026 |
| Eric R. Ball |  |  |
| /s/ Daniel L. Sheehan | Director | January 22, 2026 |
| Daniel L. Sheehan |  |  |
| /s/ Vishwesh Pai | Director | January 22, 2026 |
| Vishwesh Pai |  |  |

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## Exhibit 5.1

**Exhibit 5.1**

![wlogo.jpg](wlogo.jpg)

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| | |
|:---|:---|
| 22 January 2026 | Our Ref: MB/cb/A9305-197343 |
| **Archimedes Tech SPAC Partners III Co.**<br> c/o Walkers Corporate Limited<br> 190 Elgin Avenue<br> George Town<br> Grand Cayman KY1-9008<br> Cayman Islands |  |

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Dear Addressee

**ARCHIMEDES TECH SPAC PARTNERS III CO.**

We have been asked to provide this legal opinion to you with regard to the laws of the Cayman Islands in connection with the registration of an underwritten initial public offering by Archimedes Tech SPAC Partners III Co. (the "**Company**"), of:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. up to 4,000,000 units (the "**Units** "), each Unit consisting of one ordinary share in the capital of the Company, par value US$0.0001 (each such ordinary share issued as part of the Units and the Over-Allotment Units (as defined below) and issued upon exercise of the Warrants (as defined below) included in the Units and the Over-Allotment Units an "**Ordinary Share**" and together, the "**Ordinary Shares** "), and one-fourth of one warrant to purchase one Ordinary Share (the "**Warrants** ");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. up to 600,000 Units (the "**Over-Allotment Units** "), which may be issued upon exercise of an option granted to the underwriters to cover over-allotments, if any;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. all Ordinary Shares and all Warrants issued as part of the Units and the Over-Allotment Units; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. all Ordinary Shares that may be issued upon exercise of the Warrants included in the Units and the Over-Allotment Units,

in each case under the United States Securities Act of 1933, as amended (the "**Securities Act**") and pursuant to the terms of the Registration Statement (as defined in Schedule 1).

For the purposes of giving this opinion, we have examined and relied solely upon the originals or copies of the documents listed in Schedule 1.

We are Cayman Islands Attorneys at Law and express no opinion as to any laws other than the laws of the Cayman Islands in force and as interpreted at the date of this opinion.

**Walkers**

190 Elgin Avenue, George Town

Grand Cayman KY1-9001, Cayman Islands

**T** +1 345 949 0100 **F** +1 345 949 7886 www.walkersglobal.com

Bermuda \| British Virgin Islands \| Cayman Islands \| Dubai \| Guernsey \| Hong Kong \| Ireland \| Jersey \| London \| Singapore

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|:---|:---|
| **WALKERS** | Page 2 |

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Based upon the foregoing examinations and the assumptions and qualifications set out below and having regard to legal considerations which we consider relevant, and under the laws of the Cayman Islands, as at the date hereof, we give the following opinions in relation to the matters set out below.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The Company is an exempted company duly incorporated with limited liability, validly existing under the laws of the Cayman Islands and in good standing with the Registrar of Companies in the Cayman Islands (the "**Registrar** ").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. The Ordinary Shares to be issued as part of the Units and the Over-Allotment Units, as contemplated by the Registration Statement, have been duly authorised by all necessary corporate action of the Company, and upon the issue of the Ordinary Shares (by the entry of the name of the registered owner thereof in the Register of Members of the Company confirming that such Ordinary Shares have been issued and credited as fully paid), delivery and payment therefor by the purchaser in accordance with the Memorandum and Articles (as defined in Schedule 1) and in the manner contemplated by the Registration Statement and the Underwriting Agreement (as defined in Schedule 1), the Ordinary Shares will be validly issued, fully paid and non-assessable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. The Ordinary Shares to be issued upon exercise of the Warrants as contemplated by the Warrant Documents (as defined in Schedule 1), have been duly authorised by all necessary corporate action of the Company and upon the issue of such Ordinary Shares (by the entry of the name of the registered owner thereof in the Register of Members of the Company confirming that such Ordinary Shares have been issued and credited as fully paid), delivery and payment therefor in accordance with the Memorandum and Articles and in the manner contemplated by the Registration Statement and the Warrant Documents, such Ordinary Shares will be validly issued, fully paid and non-assessable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. The execution, delivery and performance of the Unit Certificate (as defined in Schedule 1) and the Warrant Documents have been authorised by and on behalf of the Company and, once the Unit Certificate and the Warrant Documents have been executed and unconditionally delivered by the Company, such documents will be duly executed and delivered on behalf of the Company and will constitute the legal, valid and binding obligations of the Company enforceable in accordance with their terms.

The foregoing opinions are given based on the following assumptions.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The originals of all documents examined in connection with this opinion are authentic. The signatures, initials and seals on the Documents and Resolutions (each as defined in Schedule 1) are, or will be, genuine and are, or will be, those of a person or persons stated therein. The Resolutions adopted at a meeting were duly adopted at duly convened meetings of the board of directors of the Company and such meeting was held and conducted in accordance with the Memorandum and Articles. All documents purporting to be sealed have been, or will be, so sealed. All copies are complete and conform to their originals. The Documents when executed will conform in every material respect to the latest drafts of the same produced to us prior to the date hereof and, where provided in successive drafts, have been marked up to indicate all changes to such Documents.

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|:---|:---|
| **WALKERS** | Page 3 |

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. The Memorandum and Articles will be the memorandum and articles of association of the Company in effect at the time of the issue of the Ordinary Shares.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. We have relied upon the statements and representations of directors, officers and other representatives of the Company as to factual matters.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. The Company will receive consideration in money or money's worth for each Ordinary Share offered by the Company when issued at the agreed issue price as per the terms of the Registration Statement, such price in any event not being less than the stated par or nominal value of each Ordinary Share.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. Each of the Documents will be duly authorised (other than by the Company with regard to the laws of the Cayman Islands), executed and delivered by or on behalf of all relevant parties prior to the issue and sale of the Ordinary Shares and will be legal, valid, binding and enforceable against all relevant parties in accordance with their terms under the laws of the State of New York and all other relevant laws (other than, with respect to the Company, the laws of the Cayman Islands).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6. The choice of New York law as the governing law of the Documents has been made in good faith and would be regarded as a valid and binding selection which will be upheld by the courts of the State of New York as a matter of New York law and all other relevant laws (other than the laws of the Cayman Islands).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7. The power, authority and legal right of all parties under all relevant laws and regulations (other than the Company under the laws of the Cayman Islands) to enter into, execute and perform their respective obligations under the Documents.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8. All preconditions to the obligations of the parties to the Underwriting Agreement, the Unit Certificate and the Warrant Documents will be satisfied or duly waived prior to the issue and sale of the Ordinary Shares and there will be no breach of the terms of the Underwriting Agreement, the Unit Certificate and the Warrant Documents.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9. There is nothing under any law (other than the laws of the Cayman Islands) which would or might affect the opinions set out herein.

The opinions expressed above are subject to the following qualifications:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The term "**enforceable**" and its cognates as used in this opinion means that the obligations assumed by any party under the Documents are of a type which the courts of the Cayman Islands (the "**Courts**" and each a "**Court**") enforce. This does not mean that those obligations will necessarily be enforced in all circumstances in accordance with their terms. In particular:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) enforcement of obligations and the priority of obligations may be limited by bankruptcy, insolvency, liquidation, restructuring, reorganisation, readjustment of debts or moratorium and other laws of general application relating to or affecting the rights of creditors or by prescription or lapse of time;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) enforcement may be limited by general principles of equity and, in particular, the availability of certain equitable remedies such as injunction or specific performance of an obligation may be limited where a Court considers damages to be an adequate remedy;

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|:---|:---|
| **WALKERS** | Page 4 |

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) claims may become barred under statutes of limitation or may be or become subject to defences of set-off, counterclaim, estoppel and similar defences;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) where obligations are to be performed in a jurisdiction outside the Cayman Islands, they may not be enforceable in the Cayman Islands to the extent that performance would be illegal under the laws of, or contrary to the public policy of, that jurisdiction;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) a judgment of a Court may be required to be made in Cayman Islands dollars;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) to the extent that any provision of the Documents is adjudicated to be penal in nature, it will not be enforceable in the Courts; in particular, the enforceability of any provision of the Documents that is adjudicated to constitute a secondary obligation which imposes a detriment on the contract-breaker out of all proportion to any legitimate interest of the innocent party in the enforcement of the primary obligation may be limited;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) to the extent that the performance of any obligation arising under the Documents would be fraudulent or contrary to public policy, it will not be enforceable in the Courts;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) in the case of an insolvent liquidation of the Company, its liabilities are required to be translated into the functional currency of the Company (being the currency of the primary economic environment in which it operated as at the commencement of the liquidation) at the exchange rates prevailing on the date of commencement of the voluntary liquidation or the day on which the winding up order is made (as the case may be);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) a Court will not necessarily award costs in litigation in accordance with contractual provisions in this regard; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(j) the effectiveness of terms in the Documents excusing any party from a liability or duty otherwise owed or indemnifying that party from the consequences of incurring such liability or breaching such duty shall be construed in accordance with, and shall be limited by, applicable law, including generally applicable rules and principles of common law and equity.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Our opinion as to good standing is based solely upon receipt of the Certificate of Good Standing issued by the Registrar. The Company shall be deemed to be in good standing under section 200A of the Companies Act (as amended) of the Cayman Islands (the "**Companies Act**") on the date of issue of the certificate if all fees and penalties under the Companies Act have been paid and the Registrar has no knowledge that the Company is in default under the Companies Act.

In this opinion letter the phrase "non-assessable" means, with respect to the issuance of shares, that a shareholder shall not, solely by virtue of its status as a shareholder, be liable for additional assessments or calls on shares of the Company or its creditors (except in exceptional circumstances, such as involving fraud, the establishment of an agency relationship or an illegal or improper purpose or other circumstances in which a court may be prepared to pierce or lift the corporate veil).

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|:---|:---|
| **WALKERS** | Page 5 |

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This opinion is limited to the matters referred to herein and shall not be construed as extending to any other matter or document not referred to herein. This opinion is given solely for your benefit and the benefit of your legal advisers acting in that capacity in relation to this transaction and may not be relied upon by any other person, other than persons entitled to rely upon it pursuant to the provisions of the Securities Act, without our prior written consent.

This opinion shall be construed in accordance with the laws of the Cayman Islands.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the references to our firm, as Cayman Islands counsel to the Company, in the Registration Statement.

Yours faithfully

/s/ Walkers (Cayman) LLP

**WALKERS (CAYMAN) LLP**

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|:---|:---|
| **WALKERS** | Page 6 |

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**SCHEDULE 1**

**LIST OF DOCUMENTS EXAMINED**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. The Certificate of Incorporation dated 1 August 2025, Register of Directors and Register of Officers, in each case, of the Company, copies of which have been provided to us by its registered office in the Cayman Islands (together the "**Company Records** "), and the Amended and Restated Memorandum and Articles of Association of the Company adopted on 22 January 2026 (the "**Memorandum and Articles** ").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. The Cayman Online Registry Information System (CORIS), the Cayman Islands' General Registry's online database, searched on 22 January 2026.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. The Register of Writs and other Originating Process of the Grand Court of the Cayman Islands kept at the Clerk of Court's Office, George Town, Grand Cayman, examined at 9.00 am on 22 January 2026.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. A copy of a Certificate of Good Standing dated 22 January 2026 in respect of the Company issued by the Registrar (the "**Certificate of Good Standing** ").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. A copy of executed written resolutions of the directors of the Company approving various matters, including the offering for sale of the Ordinary Shares dated 23 December 2025 and 13 January 2026 and a copy of executed minutes of a meeting of the board of directors of the Company dated 22 January 2026 (together the "**Resolutions** ").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6. Copies of the following documents (the "**Documents** "):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a. the Registration Statement on Form S-1, as amended, (Registration No. 333- 292419) initially filed on 23 December 2025 by the Company with the United States Securities and Exchange Commission;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b. the S-1 MEF Registration Statement filed on the date hereof by the Company with the United States Securities and Exchange Commission registering the Units, Ordinary Shares and Warrants under the Securities Act(as filed, the "**Registration Statement** ");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c. a draft of the form of the warrant agreement to be entered into by and between the Company and Odyssey Transfer & Trust Company as warrant agent and the warrant certificate constituting the Warrants (the "**Warrant Documents** ");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d. a draft of the form of the unit certificate constituting the Units (the "**Unit Certificate** "); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e. a draft of the form of the underwriting agreement (the "**Underwriting Agreement**") to be entered into between the Company and the underwriters listed therein.

## Exhibit 5.2

**Exhibit 5.2**

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| | | | |
|:---|:---|:---|:---|
| ![lllogo.jpg](lllogo.jpg) | **Loeb & Loeb LLP**<br> 345 Park Avenue<br> New York, NY 10154-1895 | **Main**<br> **Fax** | 212.407.4000<br> 212.407.4990 |

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January 22, 2026

Archimedes Tech SPAC Partners III Co.

2093 Philadelphia Pike #1968

Claymont, DE 19703

Re: Archimedes Tech SPAC Partners III Co.

Ladies and Gentlemen:

We have acted as U.S. counsel to Archimedes Tech SPAC Partners III Co., a Cayman Islands exempted company (the "Company"), in connection with the Registration Statement on Form S-1 (as amended, the "Registration Statement") filed with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the "Act"), covering an underwritten public offering (the "Offering") of (i) 4,000,000 units (the "Units"), with each Unit consisting of one of the Company's ordinary shares, par value $0.0001 per share (the "Ordinary Shares"), and one-fourth of one redeemable warrant (the "Warrants"), with each whole warrant entitling the holder thereof to purchase one Ordinary Share at a price of $11.50 per share, subject to adjustment; (ii) up to 600,000 Units (the "Over-Allotment Units") for which the underwriters have been granted an over-allotment option; (iii) all Ordinary Shares and Warrants issued as part of the Units and Over-Allotment Units; and (iv) all Ordinary Shares issuable upon exercise of the Warrants included in the Units and Over-Allotment Units.

We have examined such documents and considered such legal matters as we have deemed necessary and relevant as the basis for the opinion set forth below. With respect to such examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as reproduced or certified copies, and the authenticity of the originals of those latter documents. As to questions of fact material to this opinion, we have, to the extent deemed appropriate, relied upon certain representations of certain officers of the Company. Because the agreements governing the Units and the Warrants contain provisions stating that they are to be governed by the laws of the State of New York, we are rendering this opinion as to New York law. We are admitted to practice in the State of New York, and we express no opinion as to any matters governed by any law other than the law of the State of New York. In particular, we do not purport to pass on any matter governed by the laws of the Cayman Islands.

Based upon the foregoing, we are of the opinion that the Warrants (including the Warrants issuable in connection with the Over-Allotment Units), the Units and the Over-Allotment Units, if and when paid for in accordance with the terms of the underwriting agreement between the Company and BTIG, LLC, the representative of the underwriters in the Offering, will constitute the valid and legally binding obligation of the Company, enforceable against it in accordance with its terms.

In addition, the foregoing opinions are qualified to the extent that (a) enforceability may be limited by and be subject to general principles of equity, regardless of whether such enforceability is considered in a proceeding in equity or at law (including, without limitation, concepts of notice and materiality), and by bankruptcy, insolvency, reorganization, moratorium and other similar laws affecting creditors' and debtors' rights generally (including, without limitation, any state or federal law in respect of fraudulent transfers); and (b) no opinion is expressed herein as to compliance with or the effect of federal or state securities or blue sky laws.

------

Archimedes Tech SPAC Partners III Co.

January 22, 2026

We hereby consent to the use of this opinion as an exhibit to the Registration Statement, to the use of our name as your U.S. counsel and to all references made to us in the Registration Statement and in the prospectus forming a part thereof. In giving this consent, we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the Act, or the rules and regulations promulgated thereunder.

Very truly yours,

/s/ Loeb & Loeb LLP

Loeb & Loeb LLP

## Exhibit 23.1

**Exhibit 23.1**

**Consent of Independent Registered Public Accounting Firm<u> </u>**

We hereby consent to the incorporation by reference in this Registration Statement on Form S-1 pursuant to rule 462(b) under the Securities Act of 1933, as amended, of our report dated January 19, 2026 (which contains an explanatory paragraph relating to substantial doubt about the ability of Archimedes Tech SPAC Partners III Co. to continue as a going concern), relating to the financial statements of Archimedes Tech SPAC Partners III Co. as of December 31, 2025 and for the period from August 1, 2025 (inception) through December 31, 2025, appearing in the Registration Statement on Form S-1, File No. 333- 292419.

/s/ WithumSmith+Brown, PC

New York, New York

January 22, 2026

## Ex-Filing

?xml version='1.0' encoding='ASCII'? EX-FILING FEES

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| |
|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Calculation of Filing Fee Tables**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **S-1**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Archimedes Tech SPAC Partners III Co.**  |

---

---

| | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Type**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Class Title**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Fee Calculation or Carry Forward Rule**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Amount Registered**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Proposed Maximum Offering Price Per Unit**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Maximum Aggregate Offering Price**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Fee Rate**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Amount of Registration Fee**  |
| **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** |
| Fees to be Paid | 1 | Equity | Units, each consisting of one ordinary share, $0.0001 par value, and one-fourth of one redeemable warrant | 457(a) | 4600000 | $10.00 | $46000000.00 | 0.0001381 | $6352.60 |
| Fees to be Paid | 2 | Equity | Ordinary shares included as part of the units | Other | 4600000 | $0.00 | $0.00 | 0.0001381 | $0.00 |
| Fees to be Paid | 3 | Equity | Redeemable warrants included as part of the units, each whole warrant to acquire one ordinary share | Other | 1150000 | $0.00 | $0.00 | 0.0001381 | $0.00 |
| Fees Previously Paid |  |  |  |  |  |  |  |  |  |
| **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** |
| Carry Forward Securities |  |  |  |  |  |  |  |  |  |
|  |  |  | Total Offering Amounts: | Total Offering Amounts: | Total Offering Amounts: |  | $46000000.00  |  | $6352.60  |
|  |  |  | Total Fees Previously Paid:  | Total Fees Previously Paid:  | Total Fees Previously Paid:  |  |  |  | $0.00  |
|  |  |  | Total Fee Offsets:  | Total Fee Offsets:  | Total Fee Offsets:  |  |  |  | $0.00  |
|  |  |  | Net Fee Due:  | Net Fee Due:  | Net Fee Due:  |  |  |  | $6352.60  |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Offering Note** <br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>1</sup> (1) Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(a) under the Securities Act of 1933, as amended (the "Securities Act"). (2) Represents only the additional number of securities being registered. Does not include the securities that the Registrant previously registered on the Registration Statement on Form S-1 (File No. 333-292419). (5) The Registrant previously registered securities having a proposed maximum aggregate offering price of $230,000,000 on its Registration Statement on Form S-1, as amended (File No. 333-292419), which was declared effective by the Securities and Exchange Commission on January 22, 2026. In accordance with Rule 462(b) under the Securities Act, an additional number of securities having a proposed maximum offering price of $46,000,000 is hereby registered, which includes securities issuable upon the exercise of the underwriters' over-allotment option.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>2</sup> (1) Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(a) under the Securities Act of 1933, as amended (the "Securities Act"). (2) Represents only the additional number of securities being registered. Does not include the securities that the Registrant previously registered on the Registration Statement on Form S-1 (File No. 333-292419). (3) Pursuant to Rule 416 under the Securities Act, there are also being registered an indeterminable number of additional securities as may be issued to prevent dilution resulting from share splits, share capitalizations or similar transactions. (4) No additional registration fee is payable pursuant to Rule 457(g) under the Securities Act. (5) The Registrant previously registered securities having a proposed maximum aggregate offering price of $230,000,000 on its Registration Statement on Form S-1, as amended (File No. 333-292419), which was declared effective by the Securities and Exchange Commission on January 22, 2026. In accordance with Rule 462(b) under the Securities Act, an additional number of securities having a proposed maximum offering price of $46,000,000 is hereby registered, which includes securities issuable upon the exercise of the underwriters' over-allotment option.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>3</sup> (1) Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(a) under the Securities Act of 1933, as amended (the "Securities Act"). (2) Represents only the additional number of securities being registered. Does not include the securities that the Registrant previously registered on the Registration Statement on Form S-1 (File No. 333-292419). (3) Pursuant to Rule 416 under the Securities Act, there are also being registered an indeterminable number of additional securities as may be issued to prevent dilution resulting from share splits, share capitalizations or similar transactions. (4) No additional registration fee is payable pursuant to Rule 457(g) under the Securities Act. (5) The Registrant previously registered securities having a proposed maximum aggregate offering price of $230,000,000 on its Registration Statement on Form S-1, as amended (File No. 333-292419), which was declared effective by the Securities and Exchange Commission on January 22, 2026. In accordance with Rule 462(b) under the Securities Act, an additional number of securities having a proposed maximum offering price of $46,000,000 is hereby registered, which includes securities issuable upon the exercise of the underwriters' over-allotment option.

---

| | |
|:---|:---|
| | |
| **Rules 457(b) and 0-11(a)(2)** | **Rules 457(b) and 0-11(a)(2)** |
| Fee Offset Claims | N/A |
| Fee Offset Sources | N/A |
| **Rule 457(p)** | **Rule 457(p)** |
| Fee Offset Claims | N/A |
| Fee Offset Sources | N/A |

---

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Type**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Class Title**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Amount of Securities Previously Registered**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Maximum Aggregate Offering Price of Securities Previously Registered**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Form Type**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **File Number**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Initial Effective Date**  |
| N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |

---