The amortized cost, unrealized gains and losses and estimated fair value of the Company's cash, cash equivalents and short-term investments as of June 30, 2025 and December 31, 2024 consisted of the following:
| | | | | | | | | | | | | | | | | | | | | | | | | As of June 30, 2025 | | Amortized Cost | | Unrealized Gain | | Unrealized Loss | | Estimated Fair Value | Cash | $ | 110.6 | | | $ | — | | | $ | — | | | $ | 110.6 | | Cash equivalents | | | | | | | | Money market funds | 625.7 | | — | | | — | | | 625.7 | Total cash & cash equivalents | $ | 736.3 | | | $ | — | | | $ | — | | | $ | 736.3 | | Short-term investments | | | | | | | | Corporate notes and obligations | 101.4 | | 0.1 | | | (1.6) | | | 99.9 | U.S. Treasury securities | 85.0 | | 0.1 | | | (1.3) | | | 83.8 | Municipal securities | 21.1 | | — | | | (0.3) | | | 20.8 | Asset backed securities | 8.6 | | — | | | (0.2) | | | 8.4 | U.S. agency obligations | 3.8 | | | — | | | (0.1) | | | 3.7 | | Supranational securities | 1.8 | | | — | | | — | | | 1.8 | | Total short-term investments | 221.7 | | | 0.2 | | | (3.5) | | | 218.4 | | Total | $ | 958.0 | | | $ | 0.2 | | | $ | (3.5) | | | $ | 954.7 | |
| | | | | | | | | | | | | | | | | | | | | | | | | As of December 31, 2024 | | Amortized Cost | | Unrealized Gain | | Unrealized Loss | | Estimated Fair Value | Cash | $ | 98.3 | | | $ | — | | | $ | — | | | $ | 98.3 | | Cash equivalents | | | | | | | | Money market funds | 1,230.0 | | | — | | | — | | | 1,230.0 | | Total cash & cash equivalents | $ | 1,328.3 | | | $ | — | | | $ | — | | | $ | 1,328.3 | | Short-term investments | | | | | | | | Corporate notes and obligations | 133.1 | | | 0.2 | | | (3.3) | | | 130.0 | | U.S. Treasury securities | 85.0 | | | — | | | (2.6) | | | 82.4 | | Municipal securities | 30.0 | | | — | | | (0.7) | | | 29.3 | | Asset backed securities | 19.2 | | | — | | | (0.3) | | | 18.9 | | U.S. agency obligations | 3.8 | | | — | | | (0.2) | | | 3.6 | | Supranational securities | 1.8 | | | — | | | (0.1) | | | 1.7 | | Total short-term investments | 272.9 | | | 0.2 | | | (7.2) | | | 265.9 | | Total | $ | 1,601.2 | | | $ | 0.2 | | | $ | (7.2) | | | $ | 1,594.2 | |
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