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Investments (Tables) | 9 Months Ended
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Oct. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Summary of Debt Securities | As of October 31, 2021, debt securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. treasury securities | $ | 1,246,777 |  |  | $ | 54 |  |  | $ | (294) |  |  | $ | 1,246,537 |
U.S. agency obligations | 232,209 |  |  | 2 |  |  | (383) |  |  | 231,828 |
Corporate bonds | 426,074 |  |  | 35 |  |  | (444) |  |  | 425,665 |
Commercial paper | 934,715 |  |  | — |  |  | — |  |  | 934,715 |
Total debt securities | $ | 2,839,775 |  |  | $ | 91 |  |  | $ | (1,121) |  |  | $ | 2,838,745 |
Included in Cash and cash equivalents | $ | 715,486 |  |  | $ | 1 |  |  | $ | (2) |  |  | $ | 715,485 |
Included in Marketable securities | $ | 2,124,289 |  |  | $ | 90 |  |  | $ | (1,119) |  |  | $ | 2,123,260 |
As of January 31, 2021, debt securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. treasury securities | $ | 1,054,146 |  |  | $ | 205 |  |  | $ | (10) |  |  | $ | 1,054,341 |
U.S. agency obligations | 504,298 |  |  | 196 |  |  | (49) |  |  | 504,445 |
Corporate bonds | 346,563 |  |  | 1,253 |  |  | (14) |  |  | 347,802 |
Commercial paper | 664,262 |  |  | — |  |  | — |  |  | 664,262 |
Total debt securities | $ | 2,569,269 |  |  | $ | 1,654 |  |  | $ | (73) |  |  | $ | 2,570,850 |
Included in Cash and cash equivalents | $ | 440,678 |  |  | $ | — |  |  | $ | — |  |  | $ | 440,678 |
Included in Marketable securities | $ | 2,128,591 |  |  | $ | 1,654 |  |  | $ | (73) |  |  | $ | 2,130,172 |
Equity Investments | Equity investments consisted of the following (in thousands):
| Condensed Consolidated Balance Sheets Location |  | October 31, 2021 |  | January 31, 2021
Money market funds | Cash and cash equivalents |  | $ | 280,481 |  |  | $ | 659,964 |
Equity investments accounted for under the equity method | Other assets |  | — |  |  | 48,222 |
Non-marketable equity investments measured using the measurement alternative | Other assets |  | 169,929 |  |  | 73,142 |
Marketable equity investments | Marketable securities |  | 134,462 |  |  | 21,300 |
Total equity investments |  |  | $ | 584,872 |  |  | $ | 802,628 |
Gain (Loss) on Securities | 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,
2021 |  | 2020 |  | 2021 |  | 2020
Net realized gains (losses) recognized on equity investments sold (1) | $ | 11,759 |  |  | $ | — |  |  | $ | 4,236 |  |  | $ | 1,591 |
Net unrealized gains (losses) recognized on equity investments held as of the end of the period | 13,448 |  |  | 3,830 |  |  | 121,167 |  |  | 1,643 |
Total net gains (losses) recognized in Other income (expense), net | $ | 25,207 |  |  | $ | 3,830 |  |  | $ | 125,403 |  |  | $ | 3,234 |
(1)Reflects the difference between the sale proceeds and the carrying value of the equity investments at the beginning of the period.
Equity Securities without Readily Determinable Fair Value | The carrying values for our non-marketable equity investments are summarized below (in thousands):
| October 31, 2021 |  | January 31, 2021 |  |
Total initial cost | $ | 130,131 |  |  | $ | 65,377 |  |  |  |  |
Cumulative net unrealized gains (losses) | 39,798 |  |  | 7,765 |  |  |  |  |
Carrying value | $ | 169,929 |  |  | $ | 73,142 |  |  |  |  |
Schedule of Marketable Equity Method Investments | The carrying values for our marketable equity investments are summarized below (in thousands):
| October 31, 2021 |  | January 31, 2021 |  |
Total initial cost | $ | 47,513 |  |  | $ | 5,000 |  |  |  |  |
Cumulative net unrealized gains (losses) | 86,949 |  |  | 16,300 |  |  |  |  |
Carrying value (1) | $ | 134,462 |  |  | $ | 21,300 |  |  |  |  |
(1)As of October 31, 2021, investments with a carrying value of $134 million are subject to a lock-up agreement through December 2021.

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