FundWatcher
Long-Term US Government Bond Portfolio
NORTHWESTERN MUTUAL SERIES FUND INC

Portfolio moves

Net position changes between two of this fund's N-PORT snapshots. These are differences between point-in-time reports — not a trade log — and share counts can be affected by splits and other corporate actions.

Dec 31, 2025 → Mar 31, 2026

Expand a category to see the positions behind it, ranked by weight.

Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
Uniform Mortgage-Backed Security, TBA 0 6,800,000 6,800,000 3.64% $6.92M
Uniform Mortgage-Backed Security, TBA 0 2,900,000 2,900,000 1.44% $2.73M
FNCL 5 4/26 0 2,000,000 2,000,000 1.04% $1.97M
US TREASURY N/B 0 1,800,000 1,800,000 0.67% $1.27M
Uniform Mortgage-Backed Security, TBA 0 1,200,000 1,200,000 0.62% $1.18M
WHEAT MAY 26 0 931,875 931,875 0.49% $931.88K
G2SF 4 4/23 0 800,000 800,000 0.39% $749.26K
FHLB 0 700,000 700,000 0.37% $698.95K
FHLB 0 700,000 700,000 0.36% $692.58K
US TREASURY N/B 0 900,000 900,000 0.35% $670.57K
FNCL 4 4/26 0 700,000 700,000 0.35% $660.47K
US TREASURY N/B 0 400,000 400,000 0.20% $385.62K
US TREASURY N/B 0 500,000 500,000 0.20% $371.60K
Uniform Mortgage-Backed Security, TBA 0 300,000 300,000 0.14% $274.34K
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
FNCL 6 1/26 6,800,000 0 -6,800,000 0.00% -$6.98M
Uniform Mortgage-Backed Security, TBA 2,800,000 0 -2,800,000 0.00% -$2.91M
FNCL 5 1/26 2,000,000 0 -2,000,000 0.00% -$1.99M
Uniform Mortgage-Backed Security, TBA 1,300,000 0 -1,300,000 0.00% -$1.23M
Uniform Mortgage-Backed Security, TBA 1,200,000 0 -1,200,000 0.00% -$1.17M
US TREASURY N/B 780,000 0 -780,000 0.00% -$785.61K
G2SF 4 1/26 800,000 0 -800,000 0.00% -$755.59K
US TREASURY N/B 400,000 0 -400,000 0.00% -$407.03K
US TREASURY N/B 400,000 0 -400,000 0.00% -$400.95K
US TREASURY N/B 300,000 0 -300,000 0.00% -$311.74K
US TREASURY N/B 200,000 0 -200,000 0.00% -$210.09K
US TREASURY N/B 200,000 0 -200,000 0.00% -$200.49K
XIB 0 03/03/26 1,000 0 -1,000 0.00% -$994
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
U.S. Treasury Inflation-Protected Notes 1.75%, Due 01/15/2034 2,751,632 2,753,244 1,612 1.44% $5.62K
US TREASURY N/B 800,000 2,700,000 1,900,000 1.37% $1.82M
US TREASURY N/B 1,620,000 2,920,000 1,300,000 1.20% $1.01M
Freddie Mac REMICS 937,160 946,562 9,403 0.46% $5.55K
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
US TREASURY N/B 42,390,000 40,890,000 -1,500,000 13.41% -$1.13M
U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.125% 01/15/2033 2,339,020 2,338,506 -514 1.18% $7.98K
Freddie Mac REMICS 1,814,062 1,770,779 -43,283 0.89% -$58.41K
U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 07/15/2032 1,792,896 1,792,512 -384 0.89% $9.22K
FR SD8429 1,619,156 1,598,635 -20,521 0.81% -$37.54K
WHEAT SEP 26 -393 -424 -31 0.53% $811.26K
FNMA POOL MA5355 FN 05/54 FIXED 6.5 702,449 609,877 -92,572 0.33% -$99.18K
FNMA POOL AM7912 FN 02/40 FIXED 3.6 493,904 487,767 -6,138 0.24% -$6.05K
Freddie Mac Military Housing Bonds Resecuritization Trust Certificates 2015-R1 538,840 536,568 -2,273 0.24% -$8.26K
U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/32 469,804 469,280 -524 0.23% $2.59K
U.S. Treasury Inflation-Protected Indexed Notes 309,498 309,150 -348 0.17% -$600
VESSEL MANAGEMENT SERVIC US GOVT GUAR 08/36 3.432 305,000 291,000 -14,000 0.14% -$8.57K
U.S. Treasury Inflation-Protected Indexed Notes 207,518 207,286 -232 0.11% -$39
Government National Mortgage Association 203,357 195,566 -7,791 0.08% -$6.78K
Government National Mortgage Association 124,445 118,965 -5,479 0.05% -$5.23K
Freddie Mac REMICS 69,100 65,385 -3,715 0.04% -$4.47K
NRZT 2020-RPL1 A1 144A FRN 11-25-59 58,587 55,386 -3,200 0.03% -$3.42K
ECMC GROUP STUDENT LOAN TRUST ECMC 2018 1A A 144A 36,900 35,183 -1,717 0.02% -$1.71K
FN 745275 22,010 21,128 -882 0.01% -$1.28K
FNMA, REMIC, Series 2012-101, Class FC 20,082 19,622 -461 0.01% -$471
FNMA 30YR 5.5% 05/01/2049#MA3706 18,430 18,260 -170 0.01% -$345
Fannie Mae REMICS 16,226 14,415 -1,811 0.01% -$1.89K
FN 735580 13,547 12,923 -624 0.01% -$738
Freddie Mac REMICS Floating Rate, Due 11/15/2040 12,525 12,129 -396 0.01% -$395
Massachusetts Educational Financing Authority, Series 2008-1, Class A1 8,276 7,734 -542 0.00% -$565
FSPC T-61 1A1 2,980 2,871 -109 0.00% -$98
Structured Asset Mortgage Investments II Trust, Series 2004-AR5, Class 1A1 850 830 -20 0.00% -$18
MLMI 2003-A4 3A 381 371 -10 0.00% -$8
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
US TREASURY N/B 16,080,000 16,080,000 0 8.15% -$181.53K
US TREASURY N/B 15,830,000 15,830,000 0 7.15% -$126.15K
US TREASURY N/B 10,900,000 10,900,000 0 5.47% -$103.04K
US TREASURY N/B 9,500,000 9,500,000 0 4.17% -$92.40K
US TREASURY N/B 10,470,000 10,470,000 0 4.02% -$65.85K
US TREASURY N/B 12,920,000 12,920,000 0 3.96% -$51.48K
US TREASURY N/B 9,800,000 9,800,000 0 3.32% -$48.23K
US TREASURY N/B 4,200,000 4,200,000 0 1.73% -$31.83K
US TREASURY N/B 4,500,000 4,500,000 0 1.68% -$24.08K
US TREASURY N/B 4,000,000 4,000,000 0 1.54% -$26.09K
US TREASURY N/B 3,100,000 3,100,000 0 1.45% -$33.42K
US TREASURY N/B 2,660,000 2,660,000 0 1.39% -$34.50K
US TREASURY N/B 2,800,000 2,800,000 0 1.33% -$32.70K
US TREASURY N/B 2,500,000 2,500,000 0 1.32% -$18.16K
US TREASURY N/B 2,900,000 2,900,000 0 1.22% -$20.39K
Freddie Mac REMICS 2,200,000 2,200,000 0 1.13% -$7.73K
US TREASURY N/B 2,430,000 2,430,000 0 0.96% -$16.90K
US TREASURY N/B 1,790,000 1,790,000 0 0.93% -$21.75K
US TREASURY N/B 1,600,000 1,600,000 0 0.79% -$18.12K
US TREASURY N/B 1,600,000 1,600,000 0 0.76% -$16.81K
US TREASURY N/B 2,300,000 2,300,000 0 0.76% -$10.60K
US TREASURY N/B 1,900,000 1,900,000 0 0.69% -$11.06K
US TREASURY N/B 1,750,000 1,750,000 0 0.65% -$11.28K
US TREASURY N/B 1,620,000 1,620,000 0 0.65% -$12.40K
RPLDCI 6.581 05/30/49 144A 1,180,000 1,180,000 0 0.64% -$33.44K
US TREASURY N/B 1,400,000 1,400,000 0 0.59% -$9.95K
USD-SOFR-OIS Compound---20350226 3,110,000 3,110,000 0 0.58% -$11.13K
US TREASURY N/B 1,410,000 1,410,000 0 0.56% -$12.12K
US TREASURY N/B 1,650,000 1,650,000 0 0.55% -$7.54K
US TREASURY N/B 1,440,000 1,440,000 0 0.53% -$9.96K
US TREASURY N/B 900,000 900,000 0 0.46% -$8.05K
US TREASURY N/B 900,000 900,000 0 0.45% -$3.90K
Federal National Mortgage Association Series 2016-61, Class ML 900,000 900,000 0 0.40% -$5.88K
US TREASURY N/B 700,000 700,000 0 0.36% -$8.61K
US TREASURY N/B 700,000 700,000 0 0.35% -$1.53K
Hilton USA Trust, Series 2016-HHV, Class A 600,000 600,000 0 0.31% $966
U.S. Treasury STRIPS Coupon 850,000 850,000 0 0.31% $3.67K
BMARK 2019-B9 A5 600,000 600,000 0 0.31% -$3.84K
US TREASURY N/B 850,000 850,000 0 0.31% -$5.48K
US TREASURY N/B 1,080,000 1,080,000 0 0.28% -$2.91K
US TREASURY N/B 500,000 500,000 0 0.27% -$6.78K
US TREASURY N/B 500,000 500,000 0 0.26% -$6.00K
Freddie Mac REMICS 621,775 621,775 0 0.25% -$3.19K
US TREASURY N/B 600,000 600,000 0 0.25% -$4.88K
TENN VALLEY AUTH BONDS 05/30 0.00000 500,000 500,000 0 0.22% -$668
ZCS BRL 14.0087 05/12/25-01/04/27 CME 3,300,102 3,300,102 0 0.21% -$114.55K
US TREASURY N/B 400,000 400,000 0 0.21% -$2.70K
US TREASURY N/B 400,000 400,000 0 0.20% -$4.45K
Resolution Funding Corp. STRIPS 400,000 400,000 0 0.19% $1.59K
US TREASURY N/B 300,000 300,000 0 0.16% -$3.70K
Hertz Vehicle Financing LLC, Series 2022-2A, Class A 300,000 300,000 0 0.15% $252
US TREASURY N/B 370,000 370,000 0 0.15% -$3.04K
US TREASURY N/B 300,000 300,000 0 0.14% -$3.32K
US TREASURY N/B 330,000 330,000 0 0.13% -$2.22K
US TREASURY N/B 400,000 400,000 0 0.11% -$1.30K
BMARK 2024-V6 A3 200,000 200,000 0 0.11% -$2.56K
US TREASURY N/B 200,000 200,000 0 0.10% -$1.70K
Commercial Mortgage Trust, Series 2018-HOME, Class A 200,000 200,000 0 0.10% -$1.41K
US TREASURY N/B 300,000 300,000 0 0.10% -$1.55K
TPMT 2020-1 A2A 200,000 200,000 0 0.10% -$15
US TREASURY N/B 100,000 100,000 0 0.05% -$711
U.S. Treasury STRIPS Coupon 220,000 220,000 0 0.05% $137
U.S. Treasury STRIPS Coupon 80,000 80,000 0 0.02% $53
U.S. Treasury STRIPS Coupon 70,000 70,000 0 0.02% $78
U.S. Treasury STRIPS Coupon 50,000 50,000 0 0.01% $20
U.S. Treasury STRIPS Coupon 50,000 50,000 0 0.01% -$3
U.S. Treasury STRIPS Coupon 40,000 40,000 0 0.01% $3

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