Biggest changeIn vestment Portfolio Composition Mortgage-Backed Securities Following is a summary of our MBS holdings: December 31, 2023 December 31, 2022 Average Average Fair Principal/ Life Fair Life value notional (in years) Coupon value Principal (in years) Coupon (dollars in thousands) Agency pass-through securities $ 4,270,056 $ 4,311,342 7.6 5.1 % $ 4,262,502 $ 4,693,045 10.1 3.5 % Subordinate credit-linked securities 301,180 275,963 4.3 12.4 % 177,898 184,620 4.6 11.2 % Senior non-Agency securities 117,489 124,771 7.0 5.1 % 22,201 28,103 14.3 2.5 % Interest-only stripped securities 94,231 419,791 7.3 4.9 % — — — — Principal-only stripped securities 53,336 65,573 3.3 — — — $ 4,836,292 $ 5,197,440 $ 4,462,601 $ 4,905,768 77 Credit Risk Transfer Arrangements Following is a summary of our investment in CRT arrangements: December 31, 2023 December 31, 2022 (in thousands) Carrying value of CRT arrangements: Derivative assets - CRT derivatives $ 16,160 $ 1,262 Derivative and credit risk transfer strip liabilities: CRT strips (46,692 ) (137,193 ) CRT derivatives — (23,360 ) (46,692 ) (160,553 ) Deposits securing CRT arrangements 1,209,498 1,325,294 Interest-only security payable at fair value (32,667 ) (21,925 ) $ 1,146,299 $ 1,144,078 UPB of loans subject to credit guarantee obligations $ 23,152,230 $ 25,315,524 Following is a summary of the composition of the loans underlying our investment in CRT arrangements as of December 31, 2023: Year of origination 2020 2019 2018 2017 2016 2015 Total (in millions) UPB: Outstanding $ 4,708 $ 10,766 $ 2,788 $ 2,357 $ 1,929 $ 604 $ 23,152 Liquidations: Balances $ 0.6 $ 6.1 $ 55.5 $ 158.4 $ 119.6 $ 60.3 $ 400.5 Losses $ 0.1 $ 0.5 $ 6.3 $ 19.6 $ 12.6 $ 7.3 $ 46.4 Modifications: Balances $ 67.5 $ 549.8 $ 303.8 $ — $ — $ — $ 921.1 Losses $ 1.3 $ 14.2 $ 11.0 $ — $ — $ — $ 26.5 Year of origination Original debt-to income ratio 2020 2019 2018 2017 2016 2015 Total (in millions) $ 967 $ 1,602 $ 255 $ 294 $ 286 $ 65 $ 3,469 25 - 30% 756 1,359 225 270 262 67 2,939 30 - 35% 830 1,649 325 364 332 91 3,591 35 - 40% 820 1,927 449 427 366 110 4,099 40 - 45% 813 2,332 662 604 508 164 5,083 >45% 522 1,897 872 398 175 107 3,971 $ 4,708 $ 10,766 $ 2,788 $ 2,357 $ 1,929 $ 604 $ 23,152 Weighted average 33.5 % 35.8 % 39.0 % 36.5 % 35.0 % 35.7 % 35.7 % Year of origination Origination FICO credit score 2020 2019 2018 2017 2016 2015 Total (in millions) 600 - 649 $ 32 $ 148 $ 66 $ 28 $ 18 $ 10 $ 302 650 - 699 231 1,018 592 357 237 119 2,554 700 - 749 1,110 3,169 984 803 609 186 6,861 750 or greater 3,328 6,404 1,139 1,165 1,065 289 13,390 Not available 7 27 7 4 — — 45 $ 4,708 $ 10,766 $ 2,788 $ 2,357 $ 1,929 $ 604 $ 23,152 Weighted average 765 754 736 745 751 742 753 78 Year of origination Origination loan-to value ratio 2020 2019 2018 2017 2016 2015 Total (in millions) $ 2,224 $ 3,810 $ 896 $ 768 $ 787 $ 246 $ 8,731 80-85% 785 2,066 657 668 518 159 4,853 85-90% 304 606 128 121 108 35 1,302 90-95% 424 1,137 320 286 212 63 2,442 95-100% 971 3,147 787 514 304 101 5,824 $ 4,708 $ 10,766 $ 2,788 $ 2,357 $ 1,929 $ 604 $ 23,152 Weighted average 80.7 % 83.3 % 83.5 % 82.4 % 80.6 % 80.9 % 82.4 % Year of origination Current loan-to value ratio (1) 2020 2019 2018 2017 2016 2015 Total (in millions) $ 4,692 $ 10,715 $ 2,771 $ 2,357 $ 1,929 $ 604 $ 23,068 80-85% 11 34 11 — — — 56 85-90% 4 12 3 — — — 19 90-95% — 3 2 — — — 5 95-100% 1 1 — — — — 2 >100% — 1 1 — — — 2 $ 4,708 $ 10,766 $ 2,788 $ 2,357 $ 1,929 $ 604 $ 23,152 Weighted average 52.7 % 52.4 % 49.8 % 44.8 % 40.9 % 38.3 % 50.1 % (1) Based on current UPB compared to estimated fair value of the property securing the loan.
Biggest changeIn vestment Portfolio Composition Mortgage-Backed Securities Following is a summary of our MBS holdings: December 31, 2024 December 31, 2023 Average Average Fair Principal/ Life Fair Principal/ Life value notional (in years) Coupon value notional (in years) Coupon (dollars in thousands) Agency pass-through securities $ 3,079,492 $ 3,132,005 8.7 5.4 % $ 4,270,056 $ 4,311,342 7.6 5.1 % Principal-only stripped securities 596,300 776,455 6.7 0.1 % 53,336 65,573 3.3 0.0 % Subordinate credit-linked securities 196,472 174,813 3.6 12.4 % 301,180 275,963 4.3 12.4 % Senior non-Agency securities 105,182 111,479 9.2 5.1 % 117,489 124,771 7.0 5.1 % Interest-only stripped securities 86,260 386,040 8.0 4.8 % 94,231 419,791 7.3 4.9 % $ 4,063,706 $ 4,580,792 $ 4,836,292 $ 5,197,440 80 Credit Risk Transfer Arrangements Following is a summary of our investment in CRT arrangements: December 31, 2024 December 31, 2023 (in thousands) Carrying value of CRT arrangements: Derivative assets - CRT derivatives $ 29,377 $ 16,160 Derivative and credit risk transfer strip liabilities- CRT strips (4,060 ) (46,692 ) Deposits securing CRT arrangements 1,110,708 1,209,498 Interest-only security payable at fair value (34,222 ) (32,667 ) $ 1,101,803 $ 1,146,299 UPB of loans subject to credit guarantee obligations $ 21,249,304 $ 23,152,230 Following is a summary of the composition of the loans underlying our investment in CRT arrangements as of December 31, 2024: Year of origination 2020 2019 2018 2017 2016 2015 Total (in millions) UPB: Outstanding $ 4,363 $ 9,883 $ 2,544 $ 2,146 $ 1,763 $ 550 $ 21,249 Liquidations: Balances $ 1.1 $ 9.9 $ 59.9 $ 165.0 $ 124.5 $ 61.6 $ 421.9 Losses $ — $ 0.9 $ 5.8 $ 20.6 $ 13.2 $ 7.5 $ 48.0 Modifications (1): Balances $ 68.8 $ 554.8 $ 307.6 $ — $ — $ — $ 931.3 Losses $ 1.9 $ 21.1 $ 16.2 $ — $ — $ — $ 39.2 Weighted average: Original debt-to income ratio 33.5 % 35.9 % 39.1 % 36.5 % 35.1 % 35.7 % 35.8 % Origination FICO credit score 765 754 736 745 751 743 753 Origination loan-to value ratio 80.7 % 83.3 % 83.5 % 82.4 % 80.6 % 80.9 % 82.4 % Current loan-to value ratio (2) 49.9 % 49.7 % 47.4 % 42.3 % 38.4 % 36.0 % 47.4 % (1) Includes only modifications that generate losses according to the terms of the CRT arrangements.