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MARKETABLE SECURITIES | 6 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | MARKETABLE SECURITIES The amortized cost and fair value of marketable securities as of the dates indicated below were as follows:
As of December 31, 2020 (In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 416,926 |  |  | $ | 1,445 |  |  | $ | (23) |  |  | $ | 418,348 |
Money market funds and other | 795,712 |  |  | — |  |  | — |  |  | 795,712 |
Municipal securities | 39,190 |  |  | 165 |  |  | (3) |  |  | 39,352 |
Sovereign securities | 3,056 |  |  | 3 |  |  | — |  |  | 3,059 |
U.S. Government agency securities | 145,774 |  |  | 325 |  |  | (3) |  |  | 146,096 |
U.S. Treasury securities | 190,282 |  |  | 708 |  |  | (1) |  |  | 190,989 |
Subtotal | 1,590,940 |  |  | 2,646 |  |  | (30) |  |  | 1,593,556 |
Add: Time deposits(1) | 160,301 |  |  | — |  |  | — |  |  | 160,301 |
Less: Cash equivalents | 888,792 |  |  | 1 |  |  | — |  |  | 888,793 |
Marketable securities | $ | 862,449 |  |  | $ | 2,645 |  |  | $ | (30) |  |  | $ | 865,064 |
As of June 30, 2020 (In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 379,334 |  |  | $ | 2,673 |  |  | $ | (50) |  |  | $ | 381,957 |
Money market funds and other | 694,950 |  |  | — |  |  | — |  |  | 694,950 |
Municipal securities | 28,859 |  |  | 251 |  |  | — |  |  | 29,110 |
Sovereign securities | 2,009 |  |  | 8 |  |  | — |  |  | 2,017 |
U.S. Government agency securities | 106,091 |  |  | 252 |  |  | (7) |  |  | 106,336 |
U.S. Treasury securities | 179,631 |  |  | 1,564 |  |  | (2) |  |  | 181,193 |
Subtotal | 1,390,874 |  |  | 4,748 |  |  | (59) |  |  | 1,395,563 |
Add: Time deposits(1) | 124,153 |  |  | — |  |  | — |  |  | 124,153 |
Less: Cash equivalents | 773,653 |  |  | — |  |  | — |  |  | 773,653 |
Marketable securities | $ | 741,374 |  |  | $ | 4,748 |  |  | $ | (59) |  |  | $ | 746,063 |
________________ (1) Time deposits excluded from fair value measurements. Our investment portfolio consists of both corporate and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. As yields increase, those securities with a lower yield-at-cost show a mark-to-market unrealized loss. Most of our unrealized losses are due to changes in market interest rates and bond yields. We believe that we have the ability to realize the full value of all of these investments upon maturity. As of December 31, 2020, we had 39 investments in an unrealized loss position. The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the date indicated below, none of which were in a continuous loss position for 12 months or more:
As of December 31, 2020 (In thousands) | Fair Value |  | Gross Unrealized Losses
Corporate debt securities | $ | 47,474 |  |  | $ | (23) |
Municipal securities | 6,478 |  |  | (3) |
U.S. Government agency securities | 6,504 |  |  | (3) |
U.S. Treasury securities | 29,252 |  |  | (1) |
Total | $ | 89,708 |  |  | $ | (30) |
As of June 30, 2020 (In thousands) | Fair Value |  | Gross Unrealized Losses
Corporate debt securities | $ | 44,429 |  |  | $ | (50) |
Municipal securities | 870 |  |  | — |
U.S. Government agency securities | 9,951 |  |  | (7) |
U.S. Treasury securities | 19,010 |  |  | (2) |
Total | $ | 74,260 |  |  | $ | (59) |
The contractual maturities of securities classified as available-for-sale, regardless of their classification on our Condensed Consolidated Balance Sheets, as of the date indicated below were as follows:
As of December 31, 2020 (In thousands) | Amortized Cost |  | Fair Value
Due within one year | $ | 468,753 |  |  | $ | 470,247 |
Due after one year through three years | 393,696 |  |  | 394,817 |
| $ | 862,449 |  |  | $ | 865,064 |
As of June 30, 2020 (In thousands) | Amortized Cost |  | Fair Value
Due within one year | $ | 415,915 |  |  | $ | 418,169 |
Due after one year through three years | 325,459 |  |  | 327,894 |
| $ | 741,374 |  |  | $ | 746,063 |
Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Realized gains and losses on available-for-sale securities for the three and six months ended December 31, 2020 and 2019 were immaterial.

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