organization · Reporting owner

X-Energy Holdings, LLC

Disclosed activity across 1 company

Tapewire entity: 37556
SEC CIK: 0002131792

Reported relationships

Latest disclosed role at each company.

Company	Last reported as	Report date	Published
X-Energy, Inc.XE · Entity 3873	10% owner	June 12, 2026	June 16, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

X-Energy, Inc.

Report date June 12, 2026 · Filed June 16, 2026

Jointly reported with Ghaffarian Kamal Seyed

Security / award	Ownership account	Disclosed shares / units	Disclosure context
Class A Common StockSEC Table I · non-derivative	IndirectSee footnote	5,308,515	Reported balance After 2026-06-12 transaction · row 1 Joint disclosure: continuity of the reported position is unresolved; see ownership footnotes. 1 source row Row 1 · 2026-06-12 · Other · Acquired 279,438 · Balance 5,308,515 F1: On June 12, 2026, IBX, LLC perfected its security interest in 279,438 shares of the Issuer's Class A Common Stock to secure the payment in full of the amount owed to it under a non-negotiable promissory note made by an unaffiliated third party in favor of IBX, LLC and gave notice of default to such third party. On that date, the outstanding amount due under the note was $3,727,858. The balance owed under the note will increase at the rate of $1,414.00 per day, plus costs and expenses of collection. Based on the closing price for such shares on NASDAQ on June 12, 2026, of $18.59 per share, 200,530 shares would have been required to satisfy the note on that date. However, upon the actual transfer of the shares of the Issuer's Class A Common Stock, the number of shares transferred to satisfy the then-outstanding amount under the note may be different from that number up to 279,438 shares. F2: Consists of (i) 471,774 shares of Class A Common Stock held by GM Enterprises, LLC, (ii) 3,951,679 shares of Class A Common Stock held by X-Energy Holdings, LLC, (iii) 12,973 shares of Class A Common Stock held by IBX Opportunity GP, Inc., (iv) 592,651 shares of Class A Common Stock held by X-energy KG Parent, LLC and (v) 279,438 shares of Class A Common Stock held by IBX, LLC. Dr. Kamal Ghaffarian has sole voting and dispositive power with respect to securities held by each of the foregoing entities. Dr. Kamal Ghaffarian disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.
Class A Common StockSEC Table I · non-derivative	Direct	1,240,543	Reported balance Holding disclosure · report date 2026-06-12 · row 2 Holding and transaction disclosures are not merged. 1 source row Row 2 · Balance 1,240,543

Filing footnotes · ownership attribution and instrument terms

F1: On June 12, 2026, IBX, LLC perfected its security interest in 279,438 shares of the Issuer's Class A Common Stock to secure the payment in full of the amount owed to it under a non-negotiable promissory note made by an unaffiliated third party in favor of IBX, LLC and gave notice of default to such third party. On that date, the outstanding amount due under the note was $3,727,858. The balance owed under the note will increase at the rate of $1,414.00 per day, plus costs and expenses of collection. Based on the closing price for such shares on NASDAQ on June 12, 2026, of $18.59 per share, 200,530 shares would have been required to satisfy the note on that date. However, upon the actual transfer of the shares of the Issuer's Class A Common Stock, the number of shares transferred to satisfy the then-outstanding amount under the note may be different from that number up to 279,438 shares.

F2: Consists of (i) 471,774 shares of Class A Common Stock held by GM Enterprises, LLC, (ii) 3,951,679 shares of Class A Common Stock held by X-Energy Holdings, LLC, (iii) 12,973 shares of Class A Common Stock held by IBX Opportunity GP, Inc., (iv) 592,651 shares of Class A Common Stock held by X-energy KG Parent, LLC and (v) 279,438 shares of Class A Common Stock held by IBX, LLC. Dr. Kamal Ghaffarian has sole voting and dispositive power with respect to securities held by each of the foregoing entities. Dr. Kamal Ghaffarian disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.

Transaction history

JSON API

Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction date	Company	Activity / security	Shares / units	Reported price	Reported value	Details
June 12, 2026 Filed Jun 16, 2026 21:30 UTC	X-Energy, Inc. XE · Entity 3873	OtherClass A Common Stock	279,438	Not disclosed	Not disclosed	Disclosure SEC source: 0001193125-26-272938 · ownership.xml · nonDerivative · entry 1 Ghaffarian Kamal Seyed · CIK 0001963529 · Director · 10% owner X-Energy Holdings, LLC · CIK 0002131792 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: No plan indicated Ownership: Indirect · See footnote Disclosed balance after: 5,308,515 F1 · kind: On June 12, 2026, IBX, LLC perfected its security interest in 279,438 shares of the Issuer's Class A Common Stock to secure the payment in full of the amount owed to it under a non-negotiable promissory note made by an unaffiliated third party in favor of IBX, LLC and gave notice of default to such third party. On that date, the outstanding amount due under the note was $3,727,858. The balance owed under the note will increase at the rate of $1,414.00 per day, plus costs and expenses of collection. Based on the closing price for such shares on NASDAQ on June 12, 2026, of $18.59 per share, 200,530 shares would have been required to satisfy the note on that date. However, upon the actual transfer of the shares of the Issuer's Class A Common Stock, the number of shares transferred to satisfy the then-outstanding amount under the note may be different from that number up to 279,438 shares. F1 · price: On June 12, 2026, IBX, LLC perfected its security interest in 279,438 shares of the Issuer's Class A Common Stock to secure the payment in full of the amount owed to it under a non-negotiable promissory note made by an unaffiliated third party in favor of IBX, LLC and gave notice of default to such third party. On that date, the outstanding amount due under the note was $3,727,858. The balance owed under the note will increase at the rate of $1,414.00 per day, plus costs and expenses of collection. Based on the closing price for such shares on NASDAQ on June 12, 2026, of $18.59 per share, 200,530 shares would have been required to satisfy the note on that date. However, upon the actual transfer of the shares of the Issuer's Class A Common Stock, the number of shares transferred to satisfy the then-outstanding amount under the note may be different from that number up to 279,438 shares. F2 · ownership.nature: Consists of (i) 471,774 shares of Class A Common Stock held by GM Enterprises, LLC, (ii) 3,951,679 shares of Class A Common Stock held by X-Energy Holdings, LLC, (iii) 12,973 shares of Class A Common Stock held by IBX Opportunity GP, Inc., (iv) 592,651 shares of Class A Common Stock held by X-energy KG Parent, LLC and (v) 279,438 shares of Class A Common Stock held by IBX, LLC. Dr. Kamal Ghaffarian has sole voting and dispositive power with respect to securities held by each of the foregoing entities. Dr. Kamal Ghaffarian disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein. Read SEC document
April 28, 2026 Filed Apr 29, 2026 20:26 UTC	X-Energy, Inc. XE · Entity 3873	GrantClass A Common Stock	6,522	$0.00	$0.00	Disclosure SEC source: 0001963529-26-000004 · ownership.xml · nonDerivative · entry 1 Ghaffarian Kamal Seyed · CIK 0001963529 · Director · 10% owner X-Energy Holdings, LLC · CIK 0002131792 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,240,543 F1 · price: Each restricted stock unit ("RSU") represents the right to receive one share of Class A common stock. The RSUs will vest on the earlier to occur of (x) April 27, 2027 and (y) the date of the 2027 Annual Meeting, subject to continued service. Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.