Mason Street Advisors, LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 12, 2026), Mason Street Advisors, LLC reported 15 stock positions worth $1.1 billion. Its top holding was iShares Core U.S. Aggregate (AGG) at 27.2% of the portfolio, followed by iShares Core S&P 500 ETF (IVV, 13.9%) and SS SPDR PF LNG TRM TSY E-Usd (SPTL, 9.5%). Compared with Q1 2026, it opened 1 new position, sold out of 1, added to 11 and reduced 3. The biggest buy was a new position in Avantis US Large Cap Value (AVLV) and the biggest sale an exit from iShares MSCI USA Value Facto (VLUE).
- Most Recent 13F
- Q2 2026
- Location
- MILWAUKEE, WI
- CIK
- 0001167711
- Portfolio Value
- $1.1B (Q2 2026)
- SEC Filing
- 0001167711-26-000005 ↗ filed Aug 12, 2026
Holdings Value
Holdings 15 stocks · $1.1B
| AGG iShares Core U.S. Aggregate | 27.21% | 3,050,830 | $302.0M | Add +0.1% |
| IVV iShares Core S&P 500 ETF | 13.93% | 206,485 | $154.6M | Reduce -2.5% |
| SPTL SS SPDR PF LNG TRM TSY E-Usd | 9.47% | 4,005,960 | $105.1M | Add +0.2% |
| SPMD SS SPDR P S&P 400 Midcap ETF | 8.64% | 1,419,072 | $95.9M | Reduce -9.2% |
| SPSM SS SPDR P S&P 600 Small Cap | 7.17% | 1,379,248 | $79.5M | Add +4.0% |
| RSP Invesco S&P 500 Equal Weight | 5.53% | 288,645 | $61.4M | Add +7.8% |
| IEFA iShares Core MSCI Eafe ETF | 5.52% | 634,753 | $61.3M | Reduce -10.7% |
| RWR SS SPDR Dow Jones REIT ETF | 4.61% | 453,255 | $51.2M | Add +30.0% |
| SCHH Schwab US REIT ETF | 4.61% | 2,161,115 | $51.2M | Add +31.3% |
| AVLV Avantis US Large Cap Value | 3.90% | 474,820 | $43.3M | New |
| IQLT iShares MSCI International Q | 3.54% | 792,666 | $39.3M | Add +3.1% |
| JPST JPMorgan Ultra-Short Income | 2.25% | 494,716 | $25.0M | Add +1.7% |
| DFIV Dimensional International Va | 2.02% | 414,285 | $22.4M | Add +2.7% |
| BCI Abrdn Bloomberg All Commodit filed as ABRDN ETFS | 1.09% | 540,495 | $12.1M | Add +51.7% |
| IEMG iShares Core MSCI Emerging | 0.51% | 68,080 | $5.6M | Add +56.4% |
Portfolio Sells Q1 2026 → Q2 2026
Portfolio Buys Q1 2026 → Q2 2026
| AVLV Avantis US Large Cap Value | New | 3.90% | +3.90 |
| RWR SS SPDR Dow Jones REIT ETF | Add +30.0% | 4.61% | +1.17 |
| SCHH Schwab US REIT ETF | Add +31.3% | 4.61% | +1.15 |
| SPSM SS SPDR P S&P 600 Small Cap | Add +4.0% | 7.17% | +0.90 |
| RSP Invesco S&P 500 Equal Weight | Add +7.8% | 5.53% | +0.51 |
| BCI Abrdn Bloomberg All Commodit | Add +51.7% | 1.09% | +0.24 |
| IEMG iShares Core MSCI Emerging | Add +56.4% | 0.51% | +0.21 |
| IQLT iShares MSCI International Q | Add +3.1% | 3.54% | +0.06 |
| DFIV Dimensional International Va | Add +2.7% | 2.02% | −0.06 |
| JPST JPMorgan Ultra-Short Income | Add +1.7% | 2.25% | −0.15 |
| SPTL SS SPDR PF LNG TRM TSY E-Usd | Add +0.2% | 9.47% | −0.81 |
| AGG iShares Core U.S. Aggregate | Add +0.1% | 27.21% | −2.38 |
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 |