Mason Street Advisors portfolio
Type not verifiedPortfolio as of Jun 30, 2026 (Q2 2026) · filed with the SEC on Aug 12, 2026 · data updated on Nov 5, 2026 · Q2 2026 13F (filing) ↗ · all its 13F filings ↗
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Mason Street Advisors reported a $1.1 bn portfolio of 15 positions to the SEC as of the end of Q2 2026. Its largest positions are AGG, IVV, SPTL. During the quarter it opened American Centy ETF Tr and exited iShares Msci USA Value Facto ETF.
Sections with a free account
What changed this quarter
14 positions with a change (1 new, 9 added to, 3 trimmed, 1 sold). 6 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- American Centy ETF Tr+3.9 ppof portfolioNew— → 3.9%
- iShares Msci USA Value Facto ETF−3.7 ppof portfolioSold out4.0% → —
- Schwab US Reit ETF+31%more sharesIncreased3.5% → 4.6%
- State Street SPDR DOW Jones Reit ETF+30%more sharesIncreased3.4% → 4.6%
- State Street SPDR P S&P 400 Midcap ETF−9.1%fewer sharesReduced9.0% → 8.6%
- iShares Core Msci Eafe ETF−11%fewer sharesReduced6.3% → 5.5%
The figure on the right: for positions added to or trimmed, the change in the number of shares (%); for new and sold ones, the points of the portfolio moved (pp). Below, the portfolio weight before → after. Traded weight: what it bought or sold, excluding price effects.
Top holdings
- iShares Core U.s. Aggregate ETFAGG27.2%
- iShares Core S&P 500 ETFIVV13.9%
- State Street SPDR PF LNG TRM TSY E-usd ETFSPTL9.5%
- State Street SPDR P S&P 400 Midcap ETFSPMD8.6%
- State Street SPDR P S&P 600 Small Cap ETFSPSM7.2%
- Invesco Exchange Traded Fund TRSP5.5%
- iShares Core Msci Eafe ETFIEFA5.5%
- State Street SPDR DOW Jones Reit ETFRWR4.6%
- Schwab US Reit ETFSCHH4.6%
- American Centy ETF TrAVLV3.9%
- iShares Msci International Q ETFIQLT3.5%
- J P Morgan Exchange Traded FundJPST2.3%
- Dimensional ETF TrustDFIV2.0%
- Abrdn EtfsBCI1.1%
- IsharesIEMG0.5%
Portfolio by sector
- ● No sector 100%
Stakes above 5% (13D/13G)
Companies where this filer reported holding 5% or more of the shares. It is the figure from its latest filing on each one; history since December 2024.
How we classify it
Type not verified: we have not assigned a type because we found no document that is enough to tell. Most 13F filers are in this situation: we only review in depth those that meet the portfolio criteria.
Not counted as a concentrated manager: more than 20% is ETFs. Its portfolio is shown all the same, but it is left out of manager counts, the consensus and the ranking. How this is decided
Managers of a similar size
A 13F portfolio value between a third and three times this one, whatever the type of filer. It is not a comparison of what they hold.
- Euro Pacific Asset ManagementInvestment firm · $1.1 bn
- Opaleye ManagementInvestment firm · $1.1 bn
- Heron Bay Capital Management$1.1 bn
- Armstrong Henry H Associates$1.1 bn
- Shannon River Fund ManagementInvestment firm · $1.1 bn
- Triple Frond Partners$1.1 bn