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Segment Reporting | 6 Months Ended
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Jun. 30, 2026
Segment Reporting [Abstract] |
Segment Reporting | (11) Segment Reporting The Company operates and manages the business as one operating segment, which is the business of developing immunology and oncology therapies. Cullinan has determined that its Chief Executive Officer is the chief operating decision maker ("CODM"). Cullinan’s CODM reviews financial information on an aggregate basis and uses net loss as presented in the consolidated statement of operations and comprehensive income (loss) for purposes of allocating resources and evaluating financial performance. Financial information of the Company’s reportable segment for the three and six months ended June 30, 2026 and 2025 is as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Research and development ("R&D") programs: |  |  |  |  |  |  |  |  |  |  |  |
CLN-049 |  | $ | 6,009 |  |  | $ | 4,898 |  |  | $ | 11,068 |  |  | $ | 8,793 |
CLN-617 |  |  | 79 |  |  |  | 1,403 |  |  |  | 764 |  |  |  | 3,196 |
CLN-619 |  |  | 1,102 |  |  |  | 7,317 |  |  |  | 3,573 |  |  |  | 13,435 |
CLN-978 |  |  | 10,532 |  |  |  | 5,393 |  |  |  | 20,197 |  |  |  | 10,066 |
Early-stage programs |  |  | 1,116 |  |  |  | 1,986 |  |  |  | 1,825 |  |  |  | 3,008 |
Velinotamig |  |  | 3,951 |  |  |  | 10 |  |  |  | 6,754 |  |  |  | 10 |
Zipalertinib |  |  | 8,273 |  |  |  | 6,001 |  |  |  | 15,206 |  |  |  | 16,161 |
Total R&D program expense |  |  | 31,062 |  |  |  | 27,008 |  |  |  | 59,387 |  |  |  | 54,669 |
Equity-based compensation |  |  | 8,447 |  |  |  | 9,887 |  |  |  | 16,063 |  |  |  | 19,261 |
R&D personnel and operations |  |  | 9,070 |  |  |  | 9,741 |  |  |  | 18,909 |  |  |  | 19,572 |
General and administrative personnel |  |  | 3,589 |  |  |  | 3,335 |  |  |  | 7,384 |  |  |  | 6,824 |
License agreement obligations |  |  | — |  |  |  | 20,115 |  |  |  | — |  |  |  | 20,153 |
Other segment expenses(1) |  |  | 5,086 |  |  |  | 5,712 |  |  |  | 9,208 |  |  |  | 10,315 |
Loss from operations |  |  | (57,254 | ) |  |  | (75,798 | ) |  |  | (110,951 | ) |  |  | (130,794 | )
Interest income |  |  | 3,648 |  |  |  | 5,924 |  |  |  | 7,746 |  |  |  | 12,504 |
Other expense, net |  |  | (98 | ) |  |  | (181 | ) |  |  | (160 | ) |  |  | (266 | )
Net loss |  | $ | (53,704 | ) |  | $ | (70,055 | ) |  | $ | (103,365 | ) |  | $ | (118,556 | )
(1) Other segment expenses for the three and six months ended June 30, 2026 and 2025 include legal fees relating to patent and corporate matters; professional fees for accounting, auditing, tax, and administrative consulting services; insurance costs; marketing expenses; depreciation; and other operating costs. All of the Company’s long-lived assets were located in the U.S. as of each of June 30, 2026 and 2025. There were no expenditures for long-lived assets in the three and six months ended June 30, 2026. Expenditures for additions to long-lived assets included purchases of property and equipment for the three and six months ended June 30, 2025.

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- Definition The entire disclosure for reporting segments including data and tables. 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