Who owns X-Energy, Inc., from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
JANE STREET GROUP, LLC: 5.2% · 15,322,002 shares — Jane Street Capital, LLC: 1.5% · 4,588,860 shares — Jane Street Global Trading, LLC: 3.6% · 10,733,042 shares
Kamal Seyed Ghaffarian: 25.0% · 92,871,109 shares — X-Energy Holdings, LLC: 21.8% · 79,033,595 shares
4 more 5% stakes behind a free account
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Sign up freeEvery institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of X-Energy, Inc. they hold.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| AMAZON COM INC | $1.21B | 65,836,948 | 27.33% | — | June 30, 2026 |
| SEGRA CAPITAL MANAGEMENT, LLC | $266M | 14,475,734 | 53.62% | — | June 30, 2026 |
186 more institutional holders behind a free account
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Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| VanEck Uranium and Nuclear ETF | $101M | 2.39% | — | June 30, 2026 |
| ARK Innovation ETF | $83.1M | 1.28% | — | April 30, 2026 |
79 more funds behind a free account
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