Mason Street Advisors
Mason Street Advisors reported 15 stocks worth $1.1B in its 13F filing for Q2 2026, filed Aug 12, 2026. Its largest holdings are AGG (27.2%), IVV (13.9%) and SPTL (9.5%). Compared with Q1 2026, the fund opened new positions in AVLV, added to SPTL, SPSM and RSP, trimmed IVV, SPMD and IEFA and sold out of VLUE.
Holdings
| # | Stock | Value | Weight | Shares | Change | Shares, 8 qtrs | Held |
|---|---|---|---|---|---|---|---|
| 1 |  AGG Ishares TR | $302M | 27.2% | 3.1M | No change | 8 of 8 | |
| 2 |  IVV Ishares TR | $155M | 13.9% | 206K | −5,196 (−2%) | 8 of 8 | |
| 3 |  SPTL Spdr Series Trust | $105M | 9.5% | 4M | +7,240 (+0%) | 8 of 8 | |
| 4 |  SPMD State Street | $95.9M | 8.6% | 1.4M | −143K (−9%) | 8 of 8 | |
| 5 |  SPSM State Street | $79.5M | 7.2% | 1.4M | +53K (+4%) | 8 of 8 | |
| 6 |  RSP Invesco Exchange Traded FD T | $61.4M | 5.5% | 289K | +21K (+8%) | 6 of 8 | |
| 7 |  IEFA Ishares TR | $61.3M | 5.5% | 635K | −76K (−11%) | 8 of 8 | |
| 8 |  RWR Spdr Series Trust | $51.2M | 4.6% | 453K | +105K (+30%) | 8 of 8 | |
| 9 |  SCHH Charles Schwab US REIT | $51.2M | 4.6% | 2.2M | +515K (+31%) | 8 of 8 | |
| 10 |  AVLV American Centy ETF TR | $43.3M | 3.9% | 475K | New position | 1 of 8 |
Positions at Jun 30, 2026, as reported. Change is against the fund's Q1 2026 filing; weight is the share of the fund's reported stocks.
Sold out
held in Q1 2026, gone in Q2 2026| Stock | Value last quarter | Shares sold |
|---|---|---|
 VLUE Ishares TR | $41M | 288K |
Reported value
last 8 quartersThe value of the US stocks the fund reported, at quarter end prices. It moves with the market as well as with buying and selling.
Filings for Q2 2026
straight from the SEC| Filed | Form | Quarter | |
|---|---|---|---|
| Aug 12, 2026 | 13F-HR | Q2 2026 | SEC filing ↗ |
Other superinvestors
All hedge fund holdings →Mason Street Advisors 13F FAQ
What does Mason Street Advisors own?
Mason Street Advisors reported 15 stocks worth $1.1B in its 13F filing for Q2 2026, filed Aug 12, 2026. Its largest holdings are AGG (27.2%), IVV (13.9%) and SPTL (9.5%). The table above lists every position in the filing (the top 10 without an account).
What did Mason Street Advisors buy and sell in Q2 2026?
Compared with Q1 2026: 1 new positions, 10 added to, 3 trimmed and 1 sold out. New positions include AVLV. It sold all of VLUE.
When will Mason Street Advisors file its next 13F?
Holdings as of Sep 30, 2026 are due by Nov 16, 2026. The filing appears on this page within minutes of reaching the SEC.
How much is Mason Street Advisors's portfolio worth?
The Q2 2026 filing reports $1.1B in US stocks. That leaves out cash, bonds, short positions and most foreign holdings, so the fund's total assets are usually larger.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Holdings come from the fund's SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. The fund may have changed its positions since. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.