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FAIR VALUE MEASUREMENTS (Tables)
9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
The Company’s assets and liabilities that are measured at fair value on a recurring basis were classified as follows (in thousands):
September 30, 2025December 31, 2024
Level 1Level 2Level 3Level 1Level 2Level 3
Cash equivalents:
Money market funds$2,268,416 $— $— $857,196 $— $— 
U.S. government securities79,582 — — 26,951 — — 
Commercial paper— 1,564 — — 509 — 
Corporate bonds— 76 — — — — 
Restricted cash:
Money market funds96,641 — — 319,800 — — 
Customer funds:
Reverse repurchase agreement1,139,122 — — 982,974 — — 
Money market funds4,645 — — 4,645 — — 
Short-term debt securities:
U.S. government securities271,717 — — 206,785 — — 
Corporate bonds— 65,231 — — 160,390 — 
U.S. agency securities— 24,029 — — 34,468 — 
Certificates of deposit— 1,246 — — 1,051 — 
Commercial paper— 8,418 — — 333 — 
Municipal securities— 131 — — 399 — 
Long-term debt securities:
U.S. government securities118,679 — — 223,258 — — 
Corporate bonds— 47,557 — — 195,344 — 
U.S. agency securities— 5,005 — — 49,030 — 
Municipal securities— 5,543 — — 4,345 — 
Other:
Bitcoin investment (i)
1,001,419 — — 792,282 — — 
Investment in marketable equity securities5,808 — — 5,407 — — 
Total
$4,986,029 $158,800 $— $3,419,298 $445,869 $— 
(i) In addition to the Company's bitcoin investment, an immaterial amount of bitcoin is held for operating purposes and, given the bitcoin is held for a relatively short period of time, typically being purchased and sold within a day, the fair value approximates carrying value. Refer to Note 11, Bitcoin for more details.
The Company estimates the fair value of its convertible and senior notes based on their last actively traded prices (Level 1) or market observable inputs (Level 2). The estimated fair value and carrying value of the convertible and senior notes were as follows (in thousands):
September 30, 2025December 31, 2024
Carrying Value Fair Value (Level 2)Carrying ValueFair Value (Level 2)
2026 Senior Notes$998,117 $985,251 $996,017 $960,589 
2030 Senior Notes1,184,858 1,201,256 — — 
2031 Senior Notes992,018 923,827 990,971 873,868 
2032 Senior Notes1,977,040 2,046,612 1,975,026 1,999,220 
2033 Senior Notes987,265 1,011,473 — — 
2025 Convertible Notes— — 999,497 991,941 
2026 Convertible Notes574,001 558,503 572,723 533,154 
2027 Convertible Notes572,201 521,847 571,202 497,517 
Total$7,285,500 $7,248,769 $6,105,436 $5,856,289 

The estimated fair value and carrying value of loans held for sale and loans held for investment were as follows (in thousands):
September 30, 2025December 31, 2024
Carrying ValueFair Value (Level 3)Carrying ValueFair Value (Level 3)
Loans held for sale$778,039 $803,058 $1,111,107 $1,112,746 
Loans held for investment2,203,273 2,258,882 365,062 382,542 
Total$2,981,312 $3,061,940 $1,476,169 $1,495,288