Data as of Q4 2025 (Dec 31, 2025)

MASON STREET ADVISORS, LLC

โ€ขCIK: 1167711โ€ขFiling: Q4 2025

MASON STREET ADVISORS, LLC manages $1.0B across a concentrated portfolio of 15 holdings. The strategy exhibits a significant allocation to fixed income and broad market ETFs, notably anchoring positions in AGG at $310.4M and IVV at $144.4M. Further diversification is evident with substantial allocations to sector-specific and index funds, including SPTL ($105.8M) and SPMD ($91.9M). This structure suggests a core focus on systematic, low-volatility exposure across fixed income and equity benchmarks.

Total AUM
$1.0B
QoQ Performance
+5.3%
Positions
7
Top 10 Concentration
91.6%
Latest Filing
Q4 2025

Top Holdings Allocation

AGG
IVV
SPTL
SPMD
SPSM
IJR
AGG30.5%
IVV14.2%
SPTL10.4%
SPMD9.0%
SPSM6.0%
IJR5.6%
RSP4.9%
IJH3.9%

๐Ÿ“ˆ Biggest Buys

IJR
ISHARES TR
NEW
5.6% of portfolio
IJH
ISHARES TR
NEW
3.9% of portfolio
RSP
INVESCO EXCHANGE TRADED FD T
+70.0%
4.9% of portfolio
SPMD
SPDR SERIES TRUST
+16.5%
9.0% of portfolio
AGG
ISHARES TR
+2.2%
30.5% of portfolio

๐Ÿ“‰ Biggest Sells

IEFA
ISHARES TR
-99.1%
0.0% of portfolio
DFIV
DIMENSIONAL ETF TRUST
-11.2%
1.9% of portfolio
BCI
ABRDN ETFS
-15.5%
0.6% of portfolio
IQLT
ISHARES TR
-0.4%
3.3% of portfolio

Sector Breakdown

Other85.8%
ETF14.2%

๐Ÿšช Exited Positionssold since Q3 2025

VLUE
ISHARES TR
SOLD
$40.0M
IEMG
ISHARES INC
SOLD
$220.8K

Changes from Q3 2025

NEW2 new positions
โ†‘9 increased
โ†“4 decreased

Historical Filings

Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023