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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Services revenue [1] $ 50,119 $ 16,919 $ 90,025 $ 34,010
Grant income 4,482 4,585 7,999 8,298
Total revenues and grant income 54,601 21,504 98,024 42,308
Operating expenses        
Direct costs 86,658 36,129 152,017 64,853
Selling, general and administrative 77,733 27,347 121,850 45,327
Research and development 244 808 299 1,210
Total operating expenses 164,635 64,284 274,166 111,390
Operating loss (110,034) (42,780) (176,142) (69,082)
Other income (expense)        
Interest expense 0 (360) 0 (484)
Interest income 11,013 4,980 19,942 10,457
Other income (expense), net (6,312) (50,688) (115,350) (39,951)
Total other income (expense), net 4,701 (46,068) (95,408) (29,978)
Net loss (105,333) (88,848) (271,550) (99,060)
Less: Net loss attributable to non-controlling interests (46,243) (88,848) (212,460) (99,060)
Net loss attributable to X-Energy, Inc. (59,090) 0 (59,090) 0
Other comprehensive income (loss)        
Foreign currency translation adjustment 410 (766) 553 (976)
Changes in fair value of liabilities under fair value option attributable to changes in instrument-specific credit risk 0 291 0 444
Other comprehensive income (loss) 410 (475) 553 (532)
Comprehensive loss (104,923) (89,323) (270,997) (99,592)
Less: Comprehensive loss attributable to non-controlling interests (46,179) (89,323) (212,253) (99,592)
Comprehensive loss attributable to X-Energy, Inc. $ (58,744) $ 0 $ (58,744) $ 0
Class A common stock        
Other income (expense)        
Net loss attributable to Class A common stock per share - basic [2] $ (0.21)   $ (0.21)  
Net loss attributable to Class A common stock per share - diluted [2] $ (0.21)   $ (0.21)  
Weighted-average shares of Class A common stock outstanding - basic [2] 280,148,818   280,148,818  
Weighted-average shares of Class A common stock outstanding - diluted [2] 280,148,818   280,148,818  
[1] Includes related party revenue of $2.4 million and $2.3 million for the three months ended June 30, 2026 and 2025, respectively, and $4.3 million and $5.0 million for the six months ended June 30, 2026 and 2025, respectively.
[2] Basic and diluted net loss per Class A common stock is presented only for the period after the Company’s Reorganization Transactions (as defined in Note 1 — Organization and Nature of Business). See Note 12 — Net Loss per Share for the calculation of net loss per share.