Mason Street Advisors, LLC
In its 13F for Q2 2025 (holdings as of June 30, 2025, filed August 8, 2025), Mason Street Advisors, LLC reported 15 stock positions worth $854.5 million. Its top holding was iShares Core U.S. Aggregate (AGG) at 32.4% of the portfolio, followed by iShares Core S&P 500 ETF (IVV, 19.6%) and SS SPDR PF LNG TRM TSY E-Usd (SPTL, 12.1%). Compared with Q1 2025, it opened 2 new positions, added to 3 and reduced 4. The biggest buy was a new position in iShares MSCI International Q (IQLT) and the biggest sale iShares Core MSCI Eafe ETF (IEFA, shares −36%).
- Most Recent 13F
- Q2 2026
- Location
- MILWAUKEE, WI
- CIK
- 0001167711
- Portfolio Value
- $854.5M (Q2 2025)
- SEC Filing
- 0001085146-25-004732 ↗ filed Aug 8, 2025
Holdings Value
Holdings 15 stocks · $854.5M
| AGG iShares Core U.S. Aggregate | 32.42% | 2,792,394 | $277.0M | Add +9.7% |
| IVV iShares Core S&P 500 ETF | 19.62% | 269,950 | $167.6M | Reduce -7.4% |
| SPTL SS SPDR PF LNG TRM TSY E-Usd | 12.05% | 3,874,900 | $103.0M | Add +4.9% |
| SPMD SS SPDR P S&P 400 Midcap ETF | 5.90% | 927,600 | $50.4M | No change |
| IEFA iShares Core MSCI Eafe ETF | 5.59% | 571,900 | $47.7M | Reduce -36.4% |
| SPSM SS SPDR P S&P 600 Small Cap | 5.43% | 1,088,800 | $46.4M | Add +27.6% |
| SCHH Schwab US REIT ETF | 3.68% | 1,486,000 | $31.4M | No change |
| RWR SS SPDR Dow Jones REIT ETF | 3.62% | 320,500 | $30.9M | No change |
| IQLT iShares MSCI International Q | 3.50% | 692,700 | $29.9M | New |
| RSP Invesco S&P 500 Equal Weight | 2.83% | 133,100 | $24.2M | No change |
| DFIV Dimensional International Va | 2.08% | 414,700 | $17.8M | New |
| JPST JPMorgan Ultra-Short Income | 1.28% | 216,650 | $11.0M | No change |
| BCI Abrdn Bloomberg All Commodit filed as ABRDN ETFS | 0.74% | 304,900 | $6.3M | No change |
| IJH iShares Core S&P Midcap ETF | 0.72% | 98,600 | $6.1M | Reduce -41.6% |
| IJR iShares Core S&P Small-Cap E | 0.54% | 42,600 | $4.7M | Reduce -17.4% |
Portfolio Sells Q1 2025 → Q2 2025
Portfolio Buys Q1 2025 → Q2 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 |