Mason Street Advisors, LLC

In its 13F for Q3 2024 (holdings as of September 30, 2024, filed November 12, 2024), Mason Street Advisors, LLC reported 12 stock positions worth $823.5 million. Its top holding was iShares Core U.S. Aggregate (AGG) at 31.0% of the portfolio, followed by iShares Core S&P 500 ETF (IVV, 21.2%) and SS SPDR PF LNG TRM TSY E-Usd (SPTL, 13.1%). Compared with Q2 2024, it added to 4 and reduced 4. The biggest buy was SS SPDR P S&P 400 Midcap ETF (SPMD, shares +900%) and the biggest sale iShares Core S&P 500 ETF (IVV, shares −3%).

Most Recent 13F
Q2 2026
Location
MILWAUKEE, WI
CIK
0001167711
Portfolio Value
$823.5M (Q3 2024)
SEC Filing
0001085146-24-005522 ↗ filed Nov 12, 2024

Holdings Value

0$500.0M$1.0B$1.5B Q1 2024: $594.2M Q1 2024 Q2 2024: $743.0M Q2 2024 Q3 2024: $823.5M $823.5M Q3 2024 Q4 2024: $772.6M Q4 2024 Q1 2025: $786.1M Q1 2025 Q2 2025: $854.5M Q2 2025 Q3 2025: $964.8M Q3 2025 Q4 2025: $1.0B Q4 2025 Q1 2026: $1.0B Q1 2026 Q2 2026: $1.1B Q2 2026

Holdings 12 stocks · $823.5M
AGG iShares Core U.S. Aggregate 31.01% 2,521,600 $255.4M Add +2.7%
IVV iShares Core S&P 500 ETF 21.24% 303,250 $174.9M Reduce -2.8%
SPTL SS SPDR PF LNG TRM TSY E-Usd 13.06% 3,700,000 $107.6M No change
IEFA iShares Core MSCI Eafe ETF 8.72% 920,400 $71.8M Add +10.5%
SPMD SS SPDR P S&P 400 Midcap ETF 4.79% 720,900 $39.4M Add +899.9%
SCHH Schwab US REIT ETF 4.38% 1,555,500 $36.0M Reduce -10.1%
RWR SS SPDR Dow Jones REIT ETF 4.37% 337,500 $36.0M Reduce -9.0%
SPSM SS SPDR P S&P 600 Small Cap 4.09% 740,700 $33.7M Add +9.7%
BCI Abrdn Bloomberg All Commodit filed as ABRDN ETFS 2.56% 1,029,600 $21.0M No change
IJH iShares Core S&P Midcap ETF 2.54% 335,500 $20.9M No change
IJR iShares Core S&P Small-Cap E 1.90% 133,700 $15.6M Reduce -30.8%
JPST JPMorgan Ultra-Short Income 1.33% 216,650 $11.0M No change

Portfolio Sells Q2 2024 → Q3 2024
IVV iShares Core S&P 500 ETF Reduce -2.8% 21.24% −1.72
IJR iShares Core S&P Small-Cap E Reduce -30.8% 1.90% −0.87
RWR SS SPDR Dow Jones REIT ETF Reduce -9.0% 4.37% −0.27
SCHH Schwab US REIT ETF Reduce -10.1% 4.38% −0.27

Portfolio Buys Q2 2024 → Q3 2024
SPMD SS SPDR P S&P 400 Midcap ETF Add +899.9% 4.79% +4.29
IEFA iShares Core MSCI Eafe ETF Add +10.5% 8.72% +0.58
SPSM SS SPDR P S&P 600 Small Cap Add +9.7% 4.09% +0.32
AGG iShares Core U.S. Aggregate Add +2.7% 31.01% −1.05

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 15$1.1BAGG, IVV, SPTL, SPMD, SPSM
Q1 2026 15$1.0BAGG, IVV, SPTL, SPMD, IEFA
Q4 2025 15$1.0BAGG, IVV, SPTL, SPMD, SPSM
Q3 2025 15$964.8MAGG, IVV, SPTL, SPMD, IEFA
Q2 2025 15$854.5MAGG, IVV, SPTL, SPMD, IEFA
Q1 2025 13$786.1MAGG, IVV, SPTL, IEFA, SPMD
Q4 2024 12$772.6MAGG, IVV, SPTL, IEFA, SPMD
Q3 2024 12$823.5MAGG, IVV, SPTL, IEFA, SPMD
Q2 2024 12$743.0MAGG, IVV, SPTL, IEFA, SCHH
Q1 2024 8$594.2MIVV, AGG, IEFA, JPST, MINT