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Net Loss per Share (Tables) | 6 Months Ended
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Jun. 30, 2026
Earnings Per Share [Abstract] |
Summary of Calculation of Basic and Diluted Net Loss Per Share | The following tables set forth the calculation of basic and diluted net loss per share for the three and six months ended June 30, 2026 and 2025 (in thousands, except per share data):
|  | Three Months Ended June 30, |
|  | 2026 |  |  | 2025 |
|  | Common Stock |  |  | Preferred Stock |  |  | Common Stock |  |  | Preferred Stock |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss — basic and diluted |  | $ | (49,824 | ) |  | $ | (3,880 | ) |  | $ | (63,127 | ) |  | $ | (6,928 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding — basic and diluted |  |  | 61,493 |  |  |  | 479 |  |  |  | 59,015 |  |  |  | 648 |
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted |  | $ | (0.81 | ) |  | $ | (8.10 | ) |  | $ | (1.07 | ) |  | $ | (10.70 | )
|  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |
|  | Common Stock |  |  | Preferred Stock |  |  | Common Stock |  |  | Preferred Stock |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss — basic and diluted |  | $ | (95,289 | ) |  | $ | (8,076 | ) |  | $ | (106,825 | ) |  | $ | (11,731 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding — basic and diluted |  |  | 60,980 |  |  |  | 517 |  |  |  | 58,960 |  |  |  | 648 |
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted |  | $ | (1.56 | ) |  | $ | (15.63 | ) |  | $ | (1.81 | ) |  | $ | (18.12 | )
Summary of Outstanding Equity Instruments Excluded from Computation of Diluted Net Income (Loss) Per Share | The following table sets forth potential common shares that were excluded from the computation of diluted net loss per share attributable to common stockholders of Cullinan for the six months ended June 30, 2026 and 2025 because their effect would have been anti-dilutive (in thousands):
|  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |
Stock options |  |  | 13,230 |  |  |  | 12,601 |
Preferred stock |  |  | 5,168 |  |  |  | 6,475 |
Restricted stock units |  |  | 564 |  |  |  | 1,609 |
Employee stock purchase plan |  |  | 15 |  |  |  | 10 |
Total |  |  | 18,977 |  |  |  | 20,695 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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