Standard Nuclear investor converts 20,243,094 shares

Welara Capital Partners LLC Series 3, a more than 10% holder of Standard Nuclear, Inc., reported the automatic conversion of its preferred stock into common shares in connection with the company’s initial public offering of Class A Common Stock.

Rhea-AI Filing Summary

Welara Capital Partners LLC Series 3, a more than 10% holder of Standard Nuclear, Inc., reported the automatic conversion of its preferred stock into common shares in connection with the company’s initial public offering of Class A Common Stock. On 2026-07-17 it converted 15,000,000 Series Seed-1, 3,515,018 Series A, and 1,728,076 Series A-2 Preferred Stock into an equal number of Class A Common Stock at a 1-for-1 ratio. Following these conversions, it holds 20,243,094 Class A Common shares directly and no longer holds those preferred series.

Insider Trade Summary

20,243,094 shares exercised/converted

Exercise 4 txns

Insider Welara Capital Partners LLC Series 3

Role 10% Owner

Type	Security	Shares	Price	Value
Conversion	Series Seed-1 Preferred Stock F1	15,000,000	--	--
Conversion	Series A Preferred Stock F1	3,515,018	--	--
Conversion	Series A-2 Preferred Stock F1	1,728,076	--	--
Conversion	Class A Common Stock F1	20,243,094	--	--

Holdings After Transaction: Series Seed-1 Preferred Stock — 0 contracts (Direct); Series A Preferred Stock — 0 contracts (Direct); Series A-2 Preferred Stock — 0 contracts (Direct); Class A Common Stock — 20,243,094 shares (Direct)

Footnotes (1)

1. F1. Pursuant to the Issuer's Fifth Amended and Restated Certificate of Incorporation, in connection with the completion of the Issuer's initial public offering of its Class A Common Stock, each share of Series Seed-1 Preferred Stock, Series A Preferred Stock, and Series A-2 Preferred Stock was automatically converted into shares of Class A Common Stock at a ratio of 1-for-1.

Key Figures

Series Seed-1 Preferred converted: 15,000,000 shares Series A Preferred converted: 3,515,018 shares Series A-2 Preferred converted: 1,728,076 shares +3 more

6 metrics

Series Seed-1 Preferred converted 15,000,000 shares Automatically converted into Class A Common Stock at 1-for-1 on 2026-07-17

Series A Preferred converted 3,515,018 shares Automatically converted into Class A Common Stock at 1-for-1 on 2026-07-17

Series A-2 Preferred converted 1,728,076 shares Automatically converted into Class A Common Stock at 1-for-1 on 2026-07-17

Class A Common acquired 20,243,094 shares Total Class A Common Stock held directly after preferred conversions

Conversion ratio 1-for-1 Each preferred share converted into one share of Class A Common Stock

Derivative exercises reported 3 transactions; 20,243,094 shares ExerciseCount and ExerciseShares from transaction summary for preferred conversions

Key Terms

Series Seed-1 Preferred Stock, Class A Common Stock, initial public offering, Fifth Amended and Restated Certificate of Incorporation

4 terms

Series Seed-1 Preferred Stock financial

"each share of Series Seed-1 Preferred Stock, Series A Preferred Stock..."

Class A Common Stock financial

"initial public offering of its Class A Common Stock, each share..."

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

initial public offering financial

"in connection with the completion of the Issuer's initial public offering..."

An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.

Fifth Amended and Restated Certificate of Incorporation regulatory

"Pursuant to the Issuer's Fifth Amended and Restated Certificate of Incorporation..."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction was reported for STDN by Welara Capital Partners LLC Series 3?

Welara Capital Partners LLC Series 3 reported a conversion of preferred stock into common, not a sale. On 2026-07-17, multiple preferred series were automatically converted into Class A Common Stock in connection with Standard Nuclear, Inc.’s initial public offering.

How many Standard Nuclear (STDN) shares did the insider hold after the conversion?

After the conversion, Welara Capital Partners LLC Series 3 directly held 20,243,094 shares of Class A Common Stock. These shares resulted from the automatic 1-for-1 conversion of its Series Seed-1, Series A, and Series A-2 Preferred Stock tied to the IPO.

Which preferred stock series were converted in the STDN Form 4 filing?

The filing shows automatic conversion of Series Seed-1 Preferred Stock, Series A Preferred Stock, and Series A-2 Preferred Stock. Each share of these preferred series converted into one share of Class A Common Stock when Standard Nuclear completed its initial public offering.

What was the conversion ratio for Standard Nuclear (STDN) preferred shares to common shares?

The preferred shares converted at a 1-for-1 ratio into Class A Common Stock. For each share of Series Seed-1, Series A, or Series A-2 Preferred Stock held by the insider, one share of Class A Common Stock was issued upon completion of the IPO.

Did the STDN insider sell any shares in this Form 4 transaction?

The Form 4 reports a conversion of securities, not open-market sales. Preferred stock positions went to zero as they were converted into Class A Common Stock, leaving the insider with 20,243,094 common shares and no remaining holdings in those preferred series.

How is the Standard Nuclear (STDN) IPO related to this Form 4 transaction?

The automatic conversions occurred in connection with the completion of the IPO of Class A Common Stock. The company’s Fifth Amended and Restated Certificate of Incorporation required each listed preferred series to convert into Class A Common Stock at that time.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/22/2026 - 08:58 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Welara Capital Partners LLC Series 3

(Last) (First) (Middle)

200 CENTRAL PARK SOUTH

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Standard Nuclear, Inc. [ STDN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/17/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	07/17/2026		C		20,243,094	A	(1)	20,243,094	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series Seed-1 Preferred Stock	(1)	07/17/2026		C			15,000,000	(1)	(1)	Class A Common Stock	15,000,000	(1)	0	D
Series A Preferred Stock	(1)	07/17/2026		C			3,515,018	(1)	(1)	Class A Common Stock	3,515,018	(1)	0	D
Series A-2 Preferred Stock	(1)	07/17/2026		C			1,728,076	(1)	(1)	Class A Common Stock	1,728,076	(1)	0	D

Explanation of Responses:

1. Pursuant to the Issuer's Fifth Amended and Restated Certificate of Incorporation, in connection with the completion of the Issuer's initial public offering of its Class A Common Stock, each share of Series Seed-1 Preferred Stock, Series A Preferred Stock, and Series A-2 Preferred Stock was automatically converted into shares of Class A Common Stock at a ratio of 1-for-1.

	Welara Capital Partners LLC Series 3 By: /s/ Colette Young Name: Colette Young Title: Executive Officer	07/22/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)