| Summary of Debt Securities |
As of October 31, 2022, debt securities consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Aggregate Fair Value | | U.S. treasury securities | $ | 2,391,963 | | | $ | 1 | | | $ | (10,333) | | | $ | 2,381,631 | | | U.S. agency obligations | 548,109 | | | — | | | (6,020) | | | 542,089 | | | Corporate bonds | 624,186 | | | 18 | | | (11,877) | | | 612,327 | | | Commercial paper | 1,054,938 | | | — | | | — | | | 1,054,938 | | | Total debt securities | $ | 4,619,196 | | | $ | 19 | | | $ | (28,230) | | | $ | 4,590,985 | | | Included in Cash and cash equivalents | $ | 757,758 | | | $ | — | | | $ | (113) | | | $ | 757,645 | | | Included in Marketable securities | $ | 3,861,438 | | | $ | 19 | | | $ | (28,117) | | | $ | 3,833,340 | |
As of January 31, 2022, debt securities consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Aggregate Fair Value | | U.S. treasury securities | $ | 843,627 | | | $ | 5 | | | $ | (1,720) | | | $ | 841,912 | | | U.S. agency obligations | 232,093 | | | — | | | (1,168) | | | 230,925 | | | Corporate bonds | 490,867 | | | — | | | (1,815) | | | 489,052 | | | Commercial paper | 969,204 | | | — | | | — | | | 969,204 | | | Total debt securities | $ | 2,535,791 | | | $ | 5 | | | $ | (4,703) | | | $ | 2,531,093 | | | Included in Cash and cash equivalents | $ | 525,524 | | | $ | — | | | $ | (1) | | | $ | 525,523 | | | Included in Marketable securities | $ | 2,010,267 | | | $ | 5 | | | $ | (4,702) | | | $ | 2,005,570 | |
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| Equity Investments |
Equity investments consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Condensed Consolidated Balance Sheets Location | | October 31, 2022 | | January 31, 2022 | | Money market funds | Cash and cash equivalents | | $ | 528,633 | | | $ | 607,640 | | | | | | | | | Non-marketable equity investments measured using the measurement alternative | Other assets | | 265,573 | | | 256,643 | | | Marketable equity investments | Marketable securities | | 82,790 | | | 104,318 | | | Total equity investments | | | $ | 876,996 | | | $ | 968,601 | |
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| Realized and Unrealized Gains and Losses With Equity Investments |
Total realized and unrealized gains and losses associated with our equity investments consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended October 31, | | Nine Months Ended October 31, | | 2022 | | 2021 | | 2022 | | 2021 | Net realized gains (losses) recognized on equity investments sold (1) | $ | 4,514 | | | $ | 11,759 | | | $ | (365) | | | $ | 4,236 | | | Net unrealized gains (losses) recognized on equity investments held as of the end of the period | (155) | | | 13,448 | | | (19,121) | | | 121,167 | | | Total net gains (losses) recognized in Other income (expense), net | $ | 4,359 | | | $ | 25,207 | | | $ | (19,486) | | | $ | 125,403 | |
(1)Reflects the difference between the sale proceeds and the carrying value of the equity investments at the beginning of the period.
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