Mason Street Advisors, LLC
In its 13F for Q3 2025 (holdings as of September 30, 2025, filed October 31, 2025), Mason Street Advisors, LLC reported 15 stock positions worth $964.8 million. Its top holding was iShares Core U.S. Aggregate (AGG) at 31.6% of the portfolio, followed by iShares Core S&P 500 ETF (IVV, 14.5%) and SS SPDR PF LNG TRM TSY E-Usd (SPTL, 11.1%). Compared with Q2 2025, it opened 2 new positions, sold out of 2, added to 12 and reduced 1. The biggest buy was a new position in iShares MSCI USA Value Facto (VLUE) and the biggest sale iShares Core S&P 500 ETF (IVV, shares −22%).
- Most Recent 13F
- Q2 2026
- Location
- MILWAUKEE, WI
- CIK
- 0001167711
- Portfolio Value
- $964.8M (Q3 2025)
- SEC Filing
- 0001167711-25-000006 ↗ filed Oct 31, 2025
Holdings Value
Holdings 15 stocks · $964.8M
| AGG iShares Core U.S. Aggregate | 31.58% | 3,039,330 | $304.7M | Add +8.8% |
| IVV iShares Core S&P 500 ETF | 14.55% | 209,670 | $140.3M | Reduce -22.3% |
| SPTL SS SPDR PF LNG TRM TSY E-Usd | 11.07% | 3,962,640 | $106.8M | Add +2.3% |
| SPMD SS SPDR P S&P 400 Midcap ETF | 8.07% | 1,362,200 | $77.9M | Add +46.9% |
| IEFA iShares Core MSCI Eafe ETF | 5.72% | 631,755 | $55.2M | Add +10.5% |
| SPSM SS SPDR P S&P 600 Small Cap | 5.59% | 1,163,700 | $53.9M | Add +6.9% |
| VLUE iShares MSCI USA Value Facto | 4.15% | 320,000 | $40.0M | New |
| RWR SS SPDR Dow Jones REIT ETF | 3.70% | 355,805 | $35.7M | Add +11.0% |
| SCHH Schwab US REIT ETF | 3.64% | 1,627,170 | $35.1M | Add +9.5% |
| IQLT iShares MSCI International Q | 3.44% | 751,440 | $33.2M | Add +8.5% |
| RSP Invesco S&P 500 Equal Weight | 3.00% | 152,610 | $29.0M | Add +14.7% |
| JPST JPMorgan Ultra-Short Income | 2.46% | 468,570 | $23.8M | Add +116.3% |
| DFIV Dimensional International Va | 2.12% | 443,115 | $20.4M | Add +6.8% |
| BCI Abrdn Bloomberg All Commodit filed as ABRDN ETFS | 0.89% | 399,645 | $8.6M | Add +31.1% |
| IEMG iShares Core MSCI Emerging | 0.02% | 3,350 | $221K | New |
Portfolio Sells Q2 2025 → Q3 2025
Portfolio Buys Q2 2025 → Q3 2025
| VLUE iShares MSCI USA Value Facto | New | 4.15% | +4.15 |
| SPMD SS SPDR P S&P 400 Midcap ETF | Add +46.9% | 8.07% | +2.17 |
| JPST JPMorgan Ultra-Short Income | Add +116.3% | 2.46% | +1.18 |
| RSP Invesco S&P 500 Equal Weight | Add +14.7% | 3.00% | +0.17 |
| SPSM SS SPDR P S&P 600 Small Cap | Add +6.9% | 5.59% | +0.16 |
| BCI Abrdn Bloomberg All Commodit | Add +31.1% | 0.89% | +0.15 |
| IEFA iShares Core MSCI Eafe ETF | Add +10.5% | 5.72% | +0.13 |
| RWR SS SPDR Dow Jones REIT ETF | Add +11.0% | 3.70% | +0.08 |
| DFIV Dimensional International Va | Add +6.8% | 2.12% | +0.04 |
| IEMG iShares Core MSCI Emerging | New | 0.02% | +0.02 |
| SCHH Schwab US REIT ETF | Add +9.5% | 3.64% | −0.04 |
| IQLT iShares MSCI International Q | Add +8.5% | 3.44% | −0.06 |
| AGG iShares Core U.S. Aggregate | Add +8.8% | 31.58% | −0.84 |
| SPTL SS SPDR PF LNG TRM TSY E-Usd | Add +2.3% | 11.07% | −0.98 |
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 |