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Rating1 (unaudited) | | Principal Amount (000) | Description | | | Value | |
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| | | | | | Interest Only Mortgage-Backed Securities—(cont’d) | | | | |
AAA | | | $ | 16,503 | 2,5 | Credit Suisse First Boston Mortgage Securities Corp., Ser. C1, Class AX, 1.781%, 6/20/29 | | $ | 504,351 | |
AAA | | | | 169,061 | 2 | CWALT, Inc., Ser. 79CB, Class A2, Zero Coupon, 1/25/36 | | | 856,581 | |
| | | | | | Federal Home Loan Mortgage Corp., | | | | |
| | | | 4,592 | 2 | Ser. 60, Class HS, 0.625%, 4/25/24 | | | 36,675 | |
| | | | — | | Ser. 176, Class M, 1,010.00%, 7/15/21 | | | 81 | |
| | | | — | | Ser. 200, Class R, 93,504.444%, 12/15/22 | | | 442 | |
| | | | 2,057 | | Ser. 204, 6.00%, 5/01/29 | | | 445,994 | |
| | | | 17 | 2 | Ser. 1043, Class H, 20.813%, 2/15/21 | | | 17,233 | |
| | | | — | 2 | Ser. 1054, Class I, 413.56%, 3/15/21 | | | 330 | |
| | | | — | | Ser. 1056, Class KD, 1,084.50%, 3/15/21 | | | 3,057 | |
| | | | 1 | 2 | Ser. 1148, Class E, 563.074%, 10/15/21 | | | 937 | |
| | | | — | | Ser. 1179, Class O, 1,009.389%, 11/15/21 | | | 228 | |
| | | | — | | Ser. 1221, Class H, 1,006.50%, 3/15/07 | | | 11 | |
| | | | 305 | | Ser. 1706, Class IA, 7.00%, 10/15/23 | | | 22,324 | |
| | | | 99 | | Ser. 1720, Class PK, 7.50%, 1/15/24 | | | 9,413 | |
| | | | 4,018 | | Ser. 1914, Class PC, 0.75%, 12/15/11 | | | 50,503 | |
| | | | 921 | 2 | Ser. 2296, Class SA, 2.43%, 3/15/16 | | | 49,241 | |
| | | | 534 | 2 | Ser. 2444, Class ST, 2.65%, 9/15/29 | | | 23,035 | |
| | | | 290 | | Ser. 2513, Class BI, 5.50%, 12/15/15 | | | 7,384 | |
| | | | 1,682 | | Ser. 2542, Class MX, 5.50%, 5/15/22 | | | 278,545 | |
| | | | 3,235 | | Ser. 2545, Class NI, 5.50%, 3/15/22 | | | 441,974 | |
| | | | 2,754 | 2 | Ser. 2559, 0.892%, 8/15/30 | | | 11,467 | |
| | | | 5,288 | | Ser. 2561, Class EW, 5.00%, 9/15/16 | | | 517,783 | |
| | | | 12,148 | | Ser. 2611, Class QI, 5.50%, 9/15/32 | | | 2,261,936 | |
| | | | 4,902 | | Ser. 2633, Class PI, 4.50%, 3/15/12 | | | 115,665 | |
| | | | 3,939 | | Ser. 2653, Class MI, 5.00%, 4/15/26 | | | 399,448 | |
| | | | 6,422 | | Ser. 2658, Class PI, 4.50%, 6/15/13 | | | 305,829 | |
| | | | 5,165 | | Ser. 2672, Class TQ, 5.00%, 3/15/23 | | | 229,933 | |
| | | | 2,784 | | Ser. 2676, Class JI, 5.50%, 8/15/13 | | | 35,497 | |
| | | | 3,633 | | Ser. 2687, Class IL, 5.00%, 9/15/18 | | | 496,985 | |
| | | | 8,478 | | Ser. 2687, Class IQ, 5.50%, 9/15/22 | | | 244,882 | |
| | | | 6,353 | | Ser. 2693, Class IB, 4.50%, 6/15/13 | | | 269,222 | |
| | | | 3,107 | | Ser. 2694, Class LI, 4.50%, 7/15/19 | | | 262,738 | |
| | | | 5,744 | | Ser. 2773, Class OX, 5.00%, 2/15/18 | | | 717,024 | |
| | | | 18,106 | 2 | Ser. 2780, Class SM, 0.68%, 4/15/34 | | | 189,097 | |
| | | | 5,343 | | Ser. 2786, Class PI, 4.50%, 10/15/10 | | | 49,260 | |
| | | | 6,727 | | Ser. 2825, Class NI, 5.50%, 3/15/30 | | | 1,672,550 | |
| | | | 2,183 | | Ser. 2949, 5.50%, 3/15/35 | | | 246,577 | |
| | | | 37,960 | 2 | Ser. 2990, Class WR, 1.306%, 6/15/35 | | | 2,126,694 | |
| | | | 107,764 | 2 | Ser. 3122, Class IS, 1.38%, 3/15/36 | | | 5,846,680 | |
| | | | 100,000 | 2 | Ser. 3225, Class EY, 0.96%, 10/15/36 | | | 4,312,500 | |
| | | | | | Federal National Mortgage Assoc., | | | | |
| | | | 248 | | Ser. 5, Class H, 9.00%, 1/25/22 | | | 60,153 | |
| | | | 15 | | Ser. 7, Class 2, 8.50%, 4/01/17 | | | 2,955 | |
| | | | 4,887 | | Ser. 9, Class BI, 5.50%, 10/25/22 | | | 746,587 | |
| | | | 1 | 2 | Ser. 10, Class S, 524.318%, 5/25/21 | | | 21,531 | |
| | | | 1 | | Ser. 12, Class C, 1,016.898%, 2/25/22 | | | 20,257 | |
| | | | 1 | 2 | Ser. 12, Class S, 553.577%, 5/25/21 | | | 19,271 | |
| | | | 6,448 | | Ser. 13, Class IG, 5.00%, 10/25/22 | | | 311,067 | |
| | | | 5,705 | | Ser. 16, Class PI, 5.00%, 11/25/12 | | | 116,985 | |
| | | | 1 | | Ser. 33, Class PV, 1,078.42%, 10/25/21 | | | 25,184 | |
| | | | 1,669 | 2 | Ser. 33, Class SG, 2.756%, 3/25/09 | | | 48,652 | |
| | | | 55,453 | 2 | Ser. 36, Class SP, 1.38%, 5/25/36 | | | 3,411,079 | |
| | | | — | | Ser. 38, Class N, 1,008.50%, 4/25/21 | | | 912 | |
| | | | 1,674 | | Ser. 43, Class LC, 6.00%, 3/25/34 | | | 425,725 | |
| | | | 1 | | Ser. 50, Class G, 1,158.628%, 12/25/21 | | | 16,194 | |
| | | | 837 | 2 | Ser. 50, Class SI, 1.20%, 4/25/23 | | | 24,218 | |
| | | | 6,723 | | Ser. 51, Class IE, 5.50%, 4/25/26 | | | 343,103 | |
| | | | 6,044 | | Ser. 55, Class GI, 5.00%, 7/25/19 | | | 706,455 | |
| | | | 4,5902 | | Ser. 59, Class S, 4.918%, 10/25/22 | | | 603,149 | |
| | | | 714 | 2 | Ser. 60, Class SB, 1.60%, 10/25/22 | | | 29,798 | |
| | | | 490 | | Ser. 62, Class IC, 5.50%, 7/25/15 | | | 19,564 | |
See Notes to Financial Statements.