Mason Street Advisors, LLC
In its 13F for Q1 2025 (holdings as of March 31, 2025, filed May 14, 2025), Mason Street Advisors, LLC reported 13 stock positions worth $786.1 million. Its top holding was iShares Core U.S. Aggregate (AGG) at 32.0% of the portfolio, followed by iShares Core S&P 500 ETF (IVV, 20.8%) and SS SPDR PF LNG TRM TSY E-Usd (SPTL, 12.8%). Compared with Q4 2024, it opened 1 new position, added to 2 and reduced 4. The biggest buy was a new position in Invesco S&P 500 Equal Weight (RSP) and the biggest sale iShares Core S&P Midcap ETF (IJH, shares −32%).
- Most Recent 13F
- Q2 2026
- Location
- MILWAUKEE, WI
- CIK
- 0001167711
- Portfolio Value
- $786.1M (Q1 2025)
- SEC Filing
- 0001085146-25-003071 ↗ filed May 14, 2025
Holdings Value
Holdings 13 stocks · $786.1M
| AGG iShares Core U.S. Aggregate | 32.03% | 2,545,100 | $251.8M | Reduce -1.2% |
| IVV iShares Core S&P 500 ETF | 20.84% | 291,550 | $163.8M | Add +1.3% |
| SPTL SS SPDR PF LNG TRM TSY E-Usd | 12.81% | 3,693,100 | $100.7M | Reduce -0.2% |
| IEFA iShares Core MSCI Eafe ETF | 8.66% | 899,800 | $68.1M | Reduce -12.9% |
| SPMD SS SPDR P S&P 400 Midcap ETF | 6.04% | 927,600 | $47.5M | Add +14.3% |
| SPSM SS SPDR P S&P 600 Small Cap | 4.43% | 853,500 | $34.8M | No change |
| SCHH Schwab US REIT ETF | 4.07% | 1,486,000 | $32.0M | No change |
| RWR SS SPDR Dow Jones REIT ETF | 4.04% | 320,500 | $31.8M | No change |
| RSP Invesco S&P 500 Equal Weight | 2.93% | 133,100 | $23.1M | New |
| JPST JPMorgan Ultra-Short Income | 1.40% | 216,650 | $11.0M | No change |
| IJH iShares Core S&P Midcap ETF | 1.25% | 168,800 | $9.8M | Reduce -32.0% |
| BCI Abrdn Bloomberg All Commodit filed as ABRDN ETFS | 0.83% | 304,900 | $6.5M | No change |
| IJR iShares Core S&P Small-Cap E | 0.69% | 51,600 | $5.4M | No change |
Portfolio Sells Q4 2024 → Q1 2025
Portfolio Buys Q4 2024 → Q1 2025
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 15 | $1.1B | AGG, IVV, SPTL, SPMD, SPSM |
| Q1 2026 | 15 | $1.0B | AGG, IVV, SPTL, SPMD, IEFA |
| Q4 2025 | 15 | $1.0B | AGG, IVV, SPTL, SPMD, SPSM |
| Q3 2025 | 15 | $964.8M | AGG, IVV, SPTL, SPMD, IEFA |
| Q2 2025 | 15 | $854.5M | AGG, IVV, SPTL, SPMD, IEFA |
| Q1 2025 | 13 | $786.1M | AGG, IVV, SPTL, IEFA, SPMD |
| Q4 2024 | 12 | $772.6M | AGG, IVV, SPTL, IEFA, SPMD |
| Q3 2024 | 12 | $823.5M | AGG, IVV, SPTL, IEFA, SPMD |
| Q2 2024 | 12 | $743.0M | AGG, IVV, SPTL, IEFA, SCHH |
| Q1 2024 | 8 | $594.2M | IVV, AGG, IEFA, JPST, MINT |