Mortgage-Backed Securities | Mortgage-Backed Securities The following tables summarize our MBS portfolio by asset type as of September 30, 2022 and December 31, 2021. September 30, 2022 $ in thousands Principal/ Notional Unamortized Amortized Unrealized Fair Period- end Weighted Average Yield (1) 30 year fixed-rate Agency RMBS 4,451,986 (53,352) 4,398,634 (145,892) 4,252,742 4.65 % Agency-CMO (2) 416,292 (360,444) 55,848 3,541 59,389 8.54 % Non-Agency CMBS 38,652 (1,758) 36,894 362 37,256 8.51 % Non-Agency RMBS (3)(4)(5) 315,941 (307,772) 8,169 (565) 7,604 8.01 % Total 5,222,871 (723,326) 4,499,545 (142,554) 4,356,991 4.74 % (1) Period-end weighted average yield is based on amortized cost as of September 30, 2022 and incorporates future prepayment and loss assumptions. (2) All Agency collateralized mortgage obligations (“Agency-CMO”) are interest-only securities (“Agency IO”). (3) Non-Agency RMBS is 63.9% fixed rate, 35.2% variable rate, and 0.9% floating rate based on fair value. Coupon payments on variable rate investments are based upon changes in the underlying hybrid adjustable-rate mortgage (“ARM”) loan coupons, while coupon payments on floating rate investments are based upon a spread to a reference index. (4) Of the total discount in non-Agency RMBS, $2.1 million is non-accretable calculated using the principal/notional balance and based on estimated future cash flows of the securities. (5) Non-Agency RMBS includes interest-only securities ("non-Agency IO") which represent 97.2% of principal/notional balance, 42.7% of amortized cost and 26.3% of fair value. December 31, 2021 $ in thousands Principal/Notional Unamortized Amortized Unrealized Fair Period- end Weighted Average Yield (1) 30 year fixed-rate Agency RMBS 7,514,229 246,183 7,760,412 (58,889) 7,701,523 2.07 % Agency-CMO (2) 235,216 (203,180) 32,036 (1,279) 30,757 6.47 % Non-Agency CMBS 61,427 (3,096) 58,331 4,578 62,909 8.63 % Non-Agency RMBS (3)(4)(5) 392,543 (383,591) 8,952 118 9,070 5.26 % Total 8,203,415 (343,684) 7,859,731 (55,472) 7,804,259 2.14 % (1) Period-end weighted average yield is based on amortized cost as of December 31, 2021 and incorporates future prepayment and loss assumptions. (2) All Agency-CMO are Agency IO. (3) Non-Agency RMBS is 63.5% fixed rate, 35.6% variable rate and 0.9% floating rate based on fair value. Coupon payments on variable rate investments are based upon changes in the underlying hybrid adjustable-rate mortgage (“ARM”) loan coupons, while coupon payments on floating rate investments are based upon a spread to a reference index. (4) Of the total discount in non-Agency RMBS, $2.1 million is non-accretable calculated using the principal/notional balance and based on estimated future cash flows of the securities. (5) Non-Agency RMBS includes non-Agency IO which represent 97.7% of principal/notional balance, 44.8% of amortized cost and 19.9% of fair value. The following table presents the fair value of our available-for-sale securities and securities accounted for under the fair value option by asset type as of September 30, 2022 and December 31, 2021. We have elected the fair value option for all of our RMBS interest-only securities and our MBS purchased on or after September 1, 2016. As of September 30, 2022 and December 31, 2021, approximately 99% of our MBS are accounted for under the fair value option. September 30, 2022 December 31, 2021 $ in thousands Available-for-sale Securities Securities under Fair Value Option Total Available-for-sale Securities Securities under Fair Value Option Total 30 year fixed-rate Agency RMBS — 4,252,742 4,252,742 — 7,701,523 7,701,523 Agency-CMO — 59,389 59,389 — 30,757 30,757 Non-Agency CMBS 37,256 — 37,256 62,909 — 62,909 Non-Agency RMBS 5,719 1,885 7,604 7,288 1,782 9,070 Total 42,975 4,314,016 4,356,991 70,197 7,734,062 7,804,259 The components of the carrying value of our MBS portfolio at September 30, 2022 and December 31, 2021 are presented below. Accrued interest receivable on our MBS portfolio, which is recorded within investment related receivable on our condensed consolidated balance sheets, was $17.9 million at September 30, 2022 (December 31, 2021: $16.6 million). September 30, 2022 $ in thousands MBS Interest-Only Securities Total Principal/notional balance 4,499,427 723,444 5,222,871 Unamortized premium 29,388 — 29,388 Unamortized discount (88,604) (664,110) (752,714) Gross unrealized gains (1) 2,931 4,790 7,721 Gross unrealized losses (1) (147,542) (2,733) (150,275) Fair value 4,295,600 61,391 4,356,991 December 31, 2021 $ in thousands MBS Interest-Only Securities Total Principal/notional balance 7,584,812 618,603 8,203,415 Unamortized premium 250,771 — 250,771 Unamortized discount (11,902) (582,553) (594,455) Gross unrealized gains (1) 8,754 109 8,863 Gross unrealized losses (1) (60,741) (3,594) (64,335) Fair value 7,771,694 32,565 7,804,259 (1) Gross unrealized gains and losses includes gains (losses) recognized in net income for securities accounted for under the fair value option as well as gains (losses) for available-for-sale securities which are recognized as adjustments to other comprehensive income. Realization occurs upon sale or settlement of such securities. Further detail on the components of our total gains (losses) on investments, net for the three and nine months ended September 30, 2022 and 2021 is provided below in this Note 4. The following table summarizes our MBS portfolio according to estimated weighted average life classifications as of September 30, 2022 and December 31, 2021 . $ in thousands September 30, 2022 December 31, 2021 Less than one year 26,951 23,150 Greater than one year and less than five years 10,306 891,510 Greater than or equal to five years 4,319,734 6,889,599 Total 4,356,991 7,804,259 The following tables present the estimated fair value and gross unrealized losses of our MBS by length of time that such securities have been in a continuous unrealized loss position at September 30, 2022 and December 31, 2021. September 30, 2022 Less than 12 Months 12 Months or More Total $ in thousands Fair Unrealized Number Fair Unrealized Number Fair Unrealized Number 30 year fixed-rate Agency RMBS (1) 4,040,618 (147,512) 40 — — — 4,040,618 (147,512) 40 Agency-CMO (1) 6,914 (798) 2 3,064 (451) 1 9,978 (1,249) 3 Non-Agency RMBS (2) 358 (30) 2 2,002 (1,484) 14 2,360 (1,514) 16 Total 4,047,890 (148,340) 44 5,066 (1,935) 15 4,052,956 (150,275) 59 (1) Fair value option has been elected for all Agency securities in an unrealized loss position. (2) Includes non-Agency IO with a fair value of $1.8 million for which the fair value option has been elected. Such securities have unrealized losses of $1.5 million. December 31, 2021 Less than 12 Months 12 Months or More Total $ in thousands Fair Unrealized Number Fair Unrealized Number Fair Unrealized Number 30 year fixed-rate Agency RMBS (1) 6,838,999 (60,741) 54 — — — 6,838,999 (60,741) 54 Agency-CMO (1) 21,810 (1,389) 5 — — — 21,810 (1,389) 5 Non-Agency RMBS (2) 767 (1,132) 5 1,042 (1,073) 9 1,809 (2,205) 14 Total 6,861,576 (63,262) 64 1,042 (1,073) 9 6,862,618 (64,335) 73 (1) Fair value option has been elected for all Agency securities in an unrealized loss position. (2) Includes non-Agency IO with a fair value of $1.7 million for which the fair value option has been elected. Such securities have unrealized losses of $2.1 million. The remaining $136,000 of unrealized losses on non-Agency RMBS are included in accumulated other comprehensive income. These losses are not reflected in an allowance for credit losses based on a comparison of discounted expected cash flows to current amortized cost basis. As of September 30, 2022 and December 31, 2021, we did not have an allowance for credit losses recorded on our condensed consolidated balance sheets. The following table presents a roll-forward of our allowance for credit losses. Nine Months Ended September 30, $ in thousands 2021 Beginning allowance for credit losses (1,768) Decrease to the allowance for credit losses on securities that had an allowance recorded in a previous period 1,768 Ending allowance for credit losses — The following table summarizes the components of our total gain (loss) on investments, net for the three and nine months ended September 30, 2022 and 2021. Three Months Ended September 30, Nine Months Ended September 30, $ in thousands 2022 2021 2022 2021 Gross realized gains on sale of MBS — 3,096 5,348 3,297 Gross realized losses on sale of MBS (120,418) (7,547) (979,792) (242,601) Net unrealized gains (losses) on MBS accounted for under the fair value option (140,590) (13,825) (81,593) (35,933) Net unrealized gains (losses) on commercial loan 171 1,446 134 (830) Net realized gains (losses) on U.S. Treasury securities — — (34,198) — Total gain (loss) on investments, net (260,837) (16,830) (1,090,101) (276,067) The following tables present components of interest income recognized on our mortgage-backed and other securities portfolio for the three and nine months ended September 30, 2022 and 2021. For the three months ended September 30, 2022 $ in thousands Coupon Net (Premium Interest Agency RMBS 48,075 (355) 47,720 Non-Agency CMBS 485 328 813 Non-Agency RMBS 288 (139) 149 Other 376 — 376 Total 49,224 (166) 49,058 For the three months ended September 30, 2021 $ in thousands Coupon Net (Premium Interest Agency RMBS 50,748 (9,548) 41,200 Non-Agency CMBS 761 480 1,241 Non-Agency RMBS 483 (273) 210 Other 6 — 6 Total 51,998 (9,341) 42,657 For the nine months ended September 30, 2022 $ in thousands Coupon Net (Premium Interest Agency RMBS 135,600 (6,861) 128,739 Non-Agency CMBS 1,890 1,340 3,230 Non-Agency RMBS 928 (422) 506 U.S. Treasury securities 1,773 (41) 1,732 Other 482 — 482 Total 140,673 (5,984) 134,689 For the nine months ended September 30, 2021 $ in thousands Coupon Net (Premium Interest Agency RMBS 150,306 (31,482) 118,824 Non-Agency CMBS 3,102 2,203 5,305 Non-Agency RMBS 1,574 (997) 577 Other 19 — 19 Total 155,001 (30,276) 124,725 |