X-Energy, Inc.: 5%+ holders

As of November 8, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of X-Energy, Inc. The largest reported stake is Kamal Seyed Ghaffarian's, at 25%. 7 filings are on record since May 4, 2026 (Schedule 13G, August 14, 2026).

Amazon.com, Inc. also filed stake reports on 1 other company ↓

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Key facts

• Filing 2026-11-06 · Reporting person: Jane Street Group, LLC · Sole voting: 0 · Shared voting: 8,161,276 · Sole dispositive: 0 · Shared dispositive: 8,161,276 · SCHEDULE 13G/A, 2026-11-06
• Filed 2026-09-04 · Holder: Jane Street Group, LLC · Percent: 5.2% · SCHEDULE 13G
• Filing 2026-08-14 · Reporting person: Kamal Seyed Ghaffarian · Sole voting: 13,837,514 · Shared voting: 79,033,595 · Sole dispositive: 13,837,514 · Shared dispositive: 79,033,595 · SCHEDULE 13G, 2026-08-14
• Filing 2026-08-12 · Reporting person: Ares Partners Holdco LLC · Sole voting: 0 · Shared voting: 38,263,341 · Sole dispositive: 0 · Shared dispositive: 38,263,341 · SCHEDULE 13G, 2026-08-12
• Filing 2026-08-06 · Reporting person: Amazon.com, Inc. · Sole voting: 65,836,948 · Shared voting: 0 · Sole dispositive: 65,836,948 · Shared dispositive: 0 · SCHEDULE 13G, 2026-08-06

X-Energy, Inc. has 7 Schedule 13D or 13G filings on record since 2026-05-04. 5 holders' latest filing reports 5% or more of class a common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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Keep reading

More on X-Energy, Inc. and the records around it.

X-Energy, Inc. elsewhere on the record

• Who owns it

Companies that share a holder

• Amazon.com, Inc. also filed stake reports on 1 other company: BETA Technologies, Inc. (Feb 2026)
• Kamal Seyed Ghaffarian also filed stake reports on 1 other company: Intuitive Machines, Inc. (Jul 2026)
• Ares Partners Holdco LLC also filed stake reports on 2 other companies: Ares Acquisition Corporation III (Aug 2026), Ares Management Corporation (Aug 2026)

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What the Full Report on X-Energy, Inc. covers

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2. Which Company This Is

3. What They Do, And How The Money Works

4. Who Runs It, And How To Reach Them

5. The Money: Funding, Valuation, Runway

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7. Warning Bells

8. Sources

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Voting and dispositive power, as filed

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The latest filing identifies X-Energy, Inc. by CUSIP 98386P102 and gives its principal executive office as 251 LITTLE FALLS DRIVE, WILMINGTON, DE 19808 (SCHEDULE 13G/A, 2026-11-06).

What the percentages are based on

22.9% The percent of class beneficially owned by Amazon was calculated assuming 287,458,734 shares of Class A common stock of X-Energy, Inc. (the "Issuer") outstanding as of June 2, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2026, filed with the Securities and Exchange Commission on June 4, 2026.Amazon.com, Inc., SCHEDULE 13G, 2026-08-06

Timeline

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Questions about who owns X-Energy, Inc.

Who owns X-Energy, Inc.?

On this page, 5 holders' latest ownership filings report 5% or more of X-Energy, Inc.: Kamal Seyed Ghaffarian (25%, Schedule 13G, filed 2026-08-14), Amazon.com, Inc. (22.9%, Schedule 13G, filed 2026-08-06), Ares Partners Holdco LLC (12.3%, Schedule 13G, filed 2026-08-12), Kenneth Griffin (6.8%, Schedule 13G, filed 2026-05-04) and Segra Capital Management, LLC (5.3%, Schedule 13G, filed 2026-07-17).

Who are the largest shareholders of X-Energy, Inc.?

By the share each holder's latest filing reports, the largest holders of X-Energy, Inc. on this page are Kamal Seyed Ghaffarian (25%), Amazon.com, Inc. (22.9%) and Ares Partners Holdco LLC (12.3%).

When did Kamal Seyed Ghaffarian buy into X-Energy, Inc.?

The filings give report dates, not purchase dates. The earliest filing from Kamal Seyed Ghaffarian on this page is the Schedule 13G, filed 2026-08-14, reporting 25%.

Is this an audit or a full list?

Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 7 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.

Also on the record for X-Energy, Inc.

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Where this comes from

Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.

Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.

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