Cash Equivalents and Investments | 5. Cash Equivalents and Investments The following is a summary of the Company’s cash equivalents and short-term and long-term investments (in thousands): As of March 31, 2024 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Short-Term Investments Long-Term Investments Debt Securities Level 1 Money market funds $ 798,671 $ — $ — $ 798,671 $ 798,671 $ — $ — U.S. Treasury securities 1,746,818 371 (5,848) 1,741,341 — 1,209,733 531,608 Subtotal 2,545,489 371 (5,848) 2,540,012 798,671 1,209,733 531,608 Level 2 U.S. agency securities 261,358 2 (278) 261,082 — 106,496 154,586 Commercial paper 185,507 — — 185,507 6,909 178,598 — Corporate debt securities 421,469 1,065 (1,599) 420,935 — 47,883 373,052 Subtotal 868,334 1,067 (1,877) 867,524 6,909 332,977 527,638 Total Debt Securities $ 3,413,823 $ 1,438 $ (7,725) $ 3,407,536 $ 805,580 $ 1,542,710 $ 1,059,246 Equity Securities Level 1 Mutual funds (1) $ 1,109 $ — $ 1,109 $ — Total Equity Securities $ 1,109 $ — $ 1,109 $ — Total Investments $ 3,413,823 $ 1,438 $ (7,725) $ 3,408,645 $ 805,580 $ 1,543,819 $ 1,059,246 As of December 31, 2023 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Short-Term Investments Long-Term Investments Debt Securities Level 1 Money market funds $ 614,888 $ — $ — $ 614,888 $ 614,888 $ — $ — U.S. Treasury securities 1,692,700 2,007 (2,547) 1,692,160 — 1,155,218 536,942 Subtotal 2,307,588 2,007 (2,547) 2,307,048 614,888 1,155,218 536,942 Level 2 U.S. agency securities 286,007 27 (197) 285,837 — 137,151 148,686 Commercial paper 184,465 — — 184,465 14,827 169,638 — Corporate debt securities 409,037 2,066 (1,262) 409,841 — 52,070 357,771 Subtotal 879,509 2,093 (1,459) 880,143 14,827 358,859 506,457 Total Debt Securities $ 3,187,097 $ 4,100 $ (4,006) $ 3,187,191 $ 629,715 $ 1,514,077 $ 1,043,399 Equity Securities Level 1 Mutual funds (1) $ 731 $ — $ 731 $ — Total Equity Securities $ 731 $ — $ 731 $ — Total Investments $ 3,187,097 $ 4,100 $ (4,006) $ 3,187,922 $ 629,715 $ 1,514,808 $ 1,043,399 (1) The equity securities relate to the Company’s nonqualified deferred compensation plan and are held in a rabbi trust. Refer to Note 14, “Employee and Director Benefits”, to the notes to the condensed consolidated financial statements for more information. As of March 31, 2024, all of the Company’s short-term debt investments have contractual maturities of one year or less and all of the Company’s long-term debt investments have contractual maturities of between one Changes in market interest rates, credit risk of borrowers and overall market liquidity, amongst other factors, may cause our short-term and long-term debt investments to fall below their amortized cost basis, resulting in unrealized losses. For those debt securities in an unrealized loss position as of March 31, 2024, the unrealized losses were primarily driven by increases in interest rates following the date of purchase and the Company does not intend to sell, nor is it more likely than not it will be required to sell, such secu rities before recovering the amortized cost basis. The following table presents fair values and gross unrealized losses, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands): As of March 31, 2024 Less Than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities $ 1,459,154 $ (5,848) $ — $ — $ 1,459,154 $ (5,848) U.S. agency securities 223,619 (241) 22,463 (37) 246,082 (278) Corporate debt securities 232,518 (1,278) 35,662 (321) 268,180 (1,599) Total $ 1,915,291 $ (7,367) $ 58,125 $ (358) $ 1,973,416 $ (7,725) As of December 31, 2023 Less Than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. Treasury securities $ 486,424 $ (2,547) $ — $ — $ 486,424 $ (2,547) U.S. agency securities 182,475 (197) — — 182,475 (197) Corporate debt securities 248,287 (1,262) — — 248,287 (1,262) Total $ 917,186 $ (4,006) $ — $ — $ 917,186 $ (4,006) |