Form 8-K

8-K — Stardust Power Inc.

Accession: 0001493152-26-043189

Filed: 2026-09-18

Period: 2026-09-17

CIK: 0001831979

SIC: 3330 (PRIMARY SMELTING & REFINING OF NONFERROUS METALS)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — form8-k.htm (Primary)

EX-5.1 (ex5-1.htm)

GRAPHIC (ex5-1_001.jpg)

GRAPHIC (ex5-1_002.jpg)

GRAPHIC (ex5-1_003.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: form8-k.htm · Sequence: 1

false

0001831979

2026-09-17

0001831979

SDST:CommonStockParValue0.0001PerShareMember

2026-09-17

0001831979

SDST:RedeemableWarrantsWith10WarrantsExercisableForOneShareOfCommonStockAtExercisePriceOf115.00Member

2026-09-17

iso4217:USD

xbrli:shares

iso4217:USD

xbrli:shares

UNITED

STATES

SECURITIES

AND EXCHANGE COMMISSION

Washington,

D.C. 20549

FORM

8-K

CURRENT

REPORT

Pursuant

to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date

of Report (Date of earliest event reported): September 17, 2026

STARDUST

POWER INC.

(Exact

name of registrant as specified in its charter)

Delaware

001-39875

99-3863616

(State

or other jurisdiction

incorporation)

(Commission

File

Number)

(IRS

Employer

Identification

No.)

E. Putnam Ave, Suite 378, Greenwich, CT

06830

(Address

of principal executive offices)

(Zip

Code)

Registrant’s

telephone number, including area code: (800) 742-3095

Not

Applicable

(Former

name or former address, if changed since last report.)

Check

the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under

any of the following provisions:

☐

Written

communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting

material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities

registered pursuant to Section 12(b) of the Act:

Title

of each class

Trading

Symbol(s)

Name

of each exchange on which registered

Common

Stock, par value $0.0001 per share

SDST

The

Nasdaq Capital Market

Redeemable

warrants, with 10 warrants exercisable for one share of Common Stock at an exercise price of $115.00

SDSTW

The

Nasdaq Capital Market

Indicate

by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405

of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging

growth company ☒

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 13(a) of the Exchange Act. ☐

Item

8.01

Other

Events.

September 17, 2026, Stardust Power Inc. (the “Company”) filed the Amendment No.1 (the “Amendment No. 1”) to the

Prospectus Supplement (as defined below) to update the maximum number of shares of the Company’s common stock (the “Placement

Shares”) issuable pursuant to the At Market Issuance Sales Agreement between the Company and B. Riley Securities, Inc., dated May

8, 2026 (the “Sales Agreement”), to up to an additional aggregate of $8,990,537 of Placement Shares.

The

issuance and sale of the Placement Shares by the Company under the Sales Agreement will be made pursuant to the Company’s registration

statement on Form S-3 (File No. 333-294938) filed with the Securities and Exchange Commission on April 9, 2026, and declared effective

on April 16, 2026, as supplemented and amended by the prospectus supplement, dated as of May 8, 2026.

copy of the legal opinion of Thompson Hine LLP relating to the Placement Shares is filed as Exhibit 5.1 hereto.

This

Current Report on Form 8-K shall not constitute an offer to sell or a solicitation of an offer to buy any shares of common stock in any

state or jurisdiction in which such an offer, solicitation, or sale would be unlawful prior to registration or qualification under the

securities laws of any such state or other jurisdiction.

Item

9.01.

Financial

Statement and Exhibits.

(d)

Exhibits.

Exhibit

Number

Description

5.1

Thompson Hine LLP.

23.1

Thompson Hine LLP (included in Exhibit 5.1).

104

Cover

Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

SIGNATURES

Pursuant

to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by

the undersigned hereunto duly authorized.

Date:

September 17, 2026

STARDUST

POWER INC.

/s/

Roshan Pujari

Roshan

Pujari

Chief

Executive Officer

EX-5.1

Filename: ex5-1.htm · Sequence: 2

Exhibit

5.1

September

17, 2026

Stardust

Power Inc.

E. Putnam Ave, Suite 378

Greenwich,

CT 06830

Re:

Stardust Power Inc. Common Stock

Ladies

and Gentlemen:

have acted as counsel to Stardust Power Inc., a Delaware corporation (the “Company”), with respect to certain

matters in connection with the offering by the Company of $8,990,537 of shares of the Company’s common stock, par value $0.0001

per share (the “Shares”), pursuant to the Registration Statement on Form S-3 (File No. 333-294938) (as amended,

the “Registration Statement”), originally filed with the Securities and Exchange Commission (the “Commission”)

under the Securities Act of 1933(as amended, the “Act”) on April 6, 2026, and declared effective by the Commission

on April 16, 2026, which includes the base prospectus and the prospectus supplement dated May 8, 2026, and the Amendment to the prospectus

supplement dated September 17, 2026, filed with the Commission pursuant to Rule 424(b) promulgated under the Act (together with the base

prospectus, the “Prospectus”). The Shares are to be sold by the Company in accordance with the At Market Issuance

Sales Agreement dated May 8, 2026, by and between the Company and B. Riley Securities, Inc. (the “Sales Agreement”),

as described in the Prospectus.

rendering this opinion, we have examined and are familiar with the following:

a. The

Certificate of Incorporation, as amended and Bylaws of the Company, through the date hereof

(the “Certificate of Incorporation” and “Bylaws”,

respectively).

b. The

Registration Statement.

c. The

Prospectus.

d. Such

other records, instruments, documents, and certificates as we have deemed advisable in order

to render such opinion.

such examination, we have assumed:

a. The

genuineness of all signatures.

b. The

legal capacity of all natural persons.

c. The

authenticity of all documents submitted to us as originals.

d. The

conformity to original documents of all documents submitted to us as copies.

Based

upon and subject to the foregoing and subject to the assumptions, limitations and qualifications stated herein, we are of the opinion

that the Shares to be issued and sold by the Company have been duly authorized for issuance and, when the Shares are issued and paid

for in accordance with the terms and conditions of the Sales Agreement, the Shares will be validly issued, fully paid and non-assessable.

Stardust Power Inc.

September 17, 2026

Page 2

Our

opinions expressed above are limited to the General Corporation Laws of the State of Delaware and laws of the State of New York, in each

case as currently in effect (collectively, “Applicable Law”), and we express no opinion as to the effect on

the matters covered by this letter of the laws of any other jurisdiction.

have relied as to certain matters on information obtained from public officials, officers of the Company, and other sources believed

by us to be responsible.

Please

note that we are opining only as to the matters expressly set forth herein, and no opinion should be inferred as to any other matters.

This opinion is based upon currently existing statutes, rules, regulations and judicial decisions, and we disclaim any obligation to

advise you of any change in any of these sources of law or subsequent legal or factual developments which might affect any matters or

opinions set forth herein.

hereby consent to the filing of this opinion as an exhibit to a Current Report on Form 8-K in accordance with the requirements of Item

601(b)(5) of Regulation S-K under the Act. In giving such 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 of the Commission.

Very

truly yours,

/s/

Thompson Hine LLP

Thompson

Hine LLP

GRAPHIC

Filename: ex5-1_001.jpg · Sequence: 3

Binary file (29623 bytes)

Download ex5-1_001.jpg

GRAPHIC

Filename: ex5-1_002.jpg · Sequence: 4

Binary file (24243 bytes)

Download ex5-1_002.jpg

GRAPHIC

Filename: ex5-1_003.jpg · Sequence: 5

Binary file (10542 bytes)

Download ex5-1_003.jpg

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 11

v3.26.3

Cover

Sep. 17, 2026

Document Type

8-K

Amendment Flag

false

Document Period End Date

Sep. 17, 2026

Entity File Number

001-39875

Entity Registrant Name

STARDUST

POWER INC.

Entity Central Index Key

0001831979

Entity Tax Identification Number

99-3863616

Entity Incorporation, State or Country Code

Entity Address, Address Line One

E. Putnam Ave

Entity Address, Address Line Two

Suite 378

Entity Address, City or Town

Greenwich

Entity Address, State or Province

Entity Address, Postal Zip Code

06830

City Area Code

(800)

Local Phone Number

742-3095

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Entity Emerging Growth Company

true

Elected Not To Use the Extended Transition Period

false

Common Stock, par value $0.0001 per share

Title of 12(b) Security

Common

Stock, par value $0.0001 per share

Trading Symbol

SDST

Security Exchange Name

NASDAQ

Redeemable warrants, with 10 warrants exercisable for one share of Common Stock at an exercise price of $115.00

Title of 12(b) Security

Redeemable

warrants, with 10 warrants exercisable for one share of Common Stock at an exercise price of $115.00

Trading Symbol

SDSTW

Security Exchange Name

NASDAQ

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 7A

-Section B

-Subsection 2

+ Details

Name:

dei_EntityExTransitionPeriod

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Details

Name:

us-gaap_StatementClassOfStockAxis=SDST_CommonStockParValue0.0001PerShareMember

Namespace Prefix:

Data Type:

Balance Type:

Period Type:

- Details

Name:

us-gaap_StatementClassOfStockAxis=SDST_RedeemableWarrantsWith10WarrantsExercisableForOneShareOfCommonStockAtExercisePriceOf115.00Member

Namespace Prefix:

Data Type:

Balance Type:

Period Type: