Mason Street Advisors, LLC Top Holdings and 13F Report (2026) About Mason Street Advisors, LLCInvestment ActivityMason Street Advisors, LLC has $1.02 billion in total holdings as of March 31, 2026.Mason Street Advisors, LLC owns shares of 15 different stocks, but just 8 companies or ETFs make up 80% of its holdings.Approximately 11.13% of the portfolio was purchased this quarter.About 10.49% of the portfolio was sold this quarter.This quarter, Mason Street Advisors, LLC has purchased 15 new stocks and bought additional shares in 9 stocks.Mason Street Advisors, LLC sold shares of 4 stocks and completely divested from 2 stocks this quarter.Largest Holdings iShares Core U.S. Aggregate Bond ETF $302,700,338iShares Core S&P 500 ETF $138,272,146SPDR Portfolio Long Term Treasury ETF $105,166,336SPDR Portfolio S&P 400 Mid Cap ETF $92,499,804iShares Core MSCI EAFE ETF $64,366,558 Largest New Holdings this Quarter 46432F388 - iShares MSCI USA Value Factor ETF $40,979,158 Holding46434G103 - iShares Core MSCI Emerging Markets ETF $3,035,520 Holding Largest Purchases this Quarter iShares Core MSCI EAFE ETF 705,297 shares (about $63.85M)iShares MSCI USA Value Factor ETF 288,200 shares (about $40.98M)iShares Core MSCI Emerging Markets ETF 43,520 shares (about $3.04M)Invesco S&P 500 Equal Weight ETF 8,390 shares (about $1.61M)SPDR Portfolio S&P 600 Small Cap ETF 32,543 shares (about $1.57M) Largest Sales this Quarter iShares Core U.S. Aggregate Bond ETF 57,967 shares (about $5.75M)SPDR Dow Jones REIT ETF 17,880 shares (about $1.81M)SPDR Portfolio S&P 400 Mid Cap ETF 25,421 shares (about $1.51M)Schwab U.S. REIT ETF 66,960 shares (about $1.44M) Sector Allocation Over TimeMap of 500 Largest Holdings ofMason Street Advisors, LLC Selling Neutral Buying Latest 13F Holdings and Changes Since Previous Quarterly FilingIssuer NameHoldings ValueApproximate Purchase/SaleChange in SharesShares Held% of PortfolioSectorAGGiShares Core U.S. Aggregate Bond ETF$302,700,338$5,754,384 â–¼-1.9%3,049,26329.6%FinanceIVViShares Core S&P 500 ETF$138,272,146$580,050 â–²0.4%211,68113.5%ETFSPTLSPDR Portfolio Long Term Treasury ETF$105,166,336$27,352 â–²0.0%3,998,72010.3%ETFSPMDSPDR Portfolio S&P 400 Mid Cap ETF$92,499,804$1,505,432 â–¼-1.6%1,561,9699.0%ETFIEFAiShares Core MSCI EAFE ETF$64,366,558$63,850,537 â–²12,373.6%710,9976.3%ETFSPSMSPDR Portfolio S&P 600 Small Cap ETF$64,092,759$1,572,478 â–²2.5%1,326,4236.3%ETFRSPInvesco S&P 500 Equal Weight ETF$51,400,014$1,610,209 â–²3.2%267,8205.0%ETFVLUEiShares MSCI USA Value Factor ETF$40,979,158$40,979,158 â–²New Holding288,2004.0%ETFIQLTiShares MSCI Intl Quality Factor ETF$35,547,634$956,499 â–²2.8%768,9303.5%ETFSCHHSchwab U.S. REIT ETF$35,375,226$1,438,970 â–¼-3.9%1,646,1253.5%ETFRWRSPDR Dow Jones REIT ETF$35,205,715$1,805,344 â–¼-4.9%348,6753.4%ETFJPSTJPMorgan Ultra-Short Income ETF$24,613,465$283,467 â–²1.2%486,3362.4%ETFDFIVDimensional International Value ETF$21,286,966$525,161 â–²2.5%403,3152.1%ETFBCIabrdn Bloomberg All Commodity Strategy K-1 Free ETF$8,655,377$452,280 â–²5.5%356,3350.8%ETFIEMGiShares Core MSCI Emerging Markets ETF$3,035,520$3,035,520 â–²New Holding43,5200.3%ETFIJRiShares Core S&P Small-Cap ETF$0$57,165,387 â–¼-100.0%00.0%ETFIJHiShares Core S&P Mid-Cap ETF$0$39,632,558 â–¼-100.0%00.0%ETFShowing largest 100 holdings. View all holdings. More Institutional Buying and Selling Information SEC Filings and Trading Data SEC Filings 13F Filings Top 13F Buys Top 13F Sells Get 30 Days of MarketBeat All Access for Free Sign up for MarketBeat All Access to gain access to MarketBeat's full suite of research tools. Start Your 30-Day Trial MarketBeat All Access Features Best-in-Class Portfolio Monitoring Get personalized stock ideas. Compare portfolio to indices. Check stock news, ratings, SEC filings, and more. Stock Ideas and Recommendations See daily stock ideas from top analysts. Receive short-term trading ideas from MarketBeat. Identify trending stocks on social media. Advanced Stock Screeners and Research Tools Use our seven stock screeners to find suitable stocks. Stay informed with MarketBeat's real-time news. Export data to Excel for personal analysis. Sign in to your free account to enjoy these benefits In-depth profiles and analysis for 20,000 public companies. 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