X-Energy holder Jane Street discloses 5.2% stake

Jane Street Group, through two Delaware subsidiaries, reports a 5.2% beneficial ownership stake in X-Energy, Inc.’s Class A common stock with shared voting and dispositive power.

Rhea-AI Filing Summary

X-Energy, Inc. (XE) has a new significant shareholder disclosure, with Jane Street Group, LLC reporting beneficial ownership of 15,322,002 shares of Class A common stock, representing 5.2% of the class. All of these shares are reported with shared voting and shared dispositive power, and no sole voting or dispositive power.

The holdings are held through subsidiaries Jane Street Capital, LLC, which reports 4,588,860 shares (about 1.5% of the class), and Jane Street Global Trading, LLC, which reports 10,733,042 shares (about 3.6% of the class). Jane Street Group, LLC files as the parent holding company.

Key Figures

Beneficially owned shares (Jane Street Group, LLC): 15,322,002 shares Percent of class owned: 5.2% Shares held by Jane Street Capital, LLC: 4,588,860 shares +5 more

8 metrics

Beneficially owned shares (Jane Street Group, LLC) 15,322,002 shares Class A common stock of X-Energy, Inc. reported on Schedule 13G

Percent of class owned 5.2% Percentage of X-Energy, Inc. Class A common stock beneficially owned by Jane Street Group, LLC

Shares held by Jane Street Capital, LLC 4,588,860 shares Beneficial ownership of X-Energy, Inc. Class A common stock

Percent of class held by Jane Street Capital, LLC 1.5% Portion of X-Energy, Inc. Class A common stock

Shares held by Jane Street Global Trading, LLC 10,733,042 shares Beneficial ownership of X-Energy, Inc. Class A common stock

Percent of class held by Jane Street Global Trading, LLC 3.6% Portion of X-Energy, Inc. Class A common stock

Shares with shared voting power 15,322,002 shares Shares of X-Energy, Inc. over which Jane Street Group, LLC has shared voting power

Shares with sole voting power 0 shares Shares of X-Energy, Inc. over which Jane Street Group, LLC has sole voting power

Key Terms

beneficially owned, shared voting power, shared dispositive power, parent holding company, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 15,322,002.00"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"Shared Voting Power 15,322,002.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 15,322,002.00"

parent holding company financial

"If a parent holding company has filed this schedule"

subsidiary financial

"Subsidiary Jane Street Capital, LLC Jane Street Global Trading, LLC"

A subsidiary is a company that is controlled or owned by a larger company, known as the parent company. Think of it like a branch or division of a bigger organization; it operates separately but is ultimately guided by the parent. For investors, understanding subsidiaries helps clarify how a larger company is structured and where its resources and risks are concentrated.

FAQ

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

What percentage of X-Energy, Inc. (XE) does Jane Street Group now beneficially own?

Jane Street Group, LLC reports beneficial ownership of 15,322,002 shares of X-Energy, Inc. Class A common stock, representing 5.2% of the outstanding class. All of these shares are reported with shared, not sole, voting and dispositive power.

How are Jane Street’s X-Energy (XE) shares split between its subsidiaries?

Jane Street Capital, LLC reports 4,588,860 shares of X-Energy Class A common stock (about 1.5% of the class), and Jane Street Global Trading, LLC reports 10,733,042 shares (about 3.6% of the class). Together they total 15,322,002 shares under Jane Street Group, LLC.

Does Jane Street have sole or shared voting power over its XE shares?

Jane Street Group, LLC reports 0 shares with sole voting power and 15,322,002 shares with shared voting power. It similarly reports 0 shares with sole dispositive power and 15,322,002 shares with shared dispositive power over X-Energy Class A common stock.

Which entities are the reporting persons in this Schedule 13G for XE?

The reporting persons are Jane Street Group, LLC, Jane Street Capital, LLC, and Jane Street Global Trading, LLC, each organized in Delaware. Jane Street Group, LLC is identified as the parent holding company, and the two LLCs are listed subsidiaries that hold the reported shares.

What class of X-Energy (XE) securities is reported in this Schedule 13G?

The filing covers Class A common stock of X-Energy, Inc., with a par value of $0.0001 per share and CUSIP 98386P102. The reported beneficial ownership relates only to this class of securities.

Where is X-Energy, Inc. based according to this Schedule 13G?

X-Energy, Inc.’s principal executive offices are located at 251 Little Falls Drive, Wilmington, Delaware 19808, as stated in the issuer information section of the Schedule 13G.

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

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Available on EDGAR 09/04/2026 - 04:09 PM EDT Accepted by SEC EDGAR 09/04/2026 - 04:09 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

X-Energy, Inc.

(Name of Issuer)

Class A common stock, par value $0.0001 per share

(Title of Class of Securities)

98386P102

(CUSIP Number)

08/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 98386P102

1

Names of Reporting Persons

JANE STREET GROUP, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 15,322,002.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 15,322,002.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

15,322,002.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.2 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 98386P102

1

Names of Reporting Persons

Jane Street Capital, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 4,588,860.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,588,860.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,588,860.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.5 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

CUSIP Number(s): 98386P102

1

Names of Reporting Persons

Jane Street Global Trading, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 10,733,042.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 10,733,042.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

10,733,042.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

3.6 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: X-Energy, Inc.
(b)	Address of issuer's principal executive offices: 251 LITTLE FALLS DRIVE, WILMINGTON, DELAWARE, 19808.
Item 2.
(a)	Name of person filing: Jane Street Group, LLC; Jane Street Capital, LLC; Jane Street Global Trading, LLC
(b)	Address or principal business office or, if none, residence: Jane Street Group, LLC 250 Vesey Street 3rd Floor New York, NY 10281 Jane Street Capital, LLC 250 Vesey Street 3rd Floor New York, NY 10281 Jane Street Global Trading, LLC 250 Vesey Street 3rd Floor New York, NY 10281
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Class A common stock, par value $0.0001 per share
(e)	CUSIP Number(s): 98386P102
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 15,322,002.00
(b)	Percent of class: 5.2%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 15,322,002.00
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 15,322,002.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Subsidiary Jane Street Capital, LLC Jane Street Global Trading, LLC
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

JANE STREET GROUP, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	09/04/2026

Jane Street Capital, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	09/04/2026

Jane Street Global Trading, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	09/04/2026