Largest positions
| Issuer | Class | Value | Share |
|---|---|---|---|
| iShares TRCORE US AGGBD ET | CORE US AGGBD ET | $301,971,153 | 27.2% |
| iShares TRCORE S&P500 ETF | CORE S&P500 ETF | $154,634,552 | 13.9% |
| SPDR Series TrustST LON TREAS ETF | ST LON TREAS ETF | $105,076,331 | 9.5% |
| SPDR Series TrustST STR P400MID | ST STR P400MID | $95,872,504 | 8.6% |
| SPDR Series TrustST STR SP600 SML | ST STR SP600 SML | $79,541,232 | 7.2% |
| Invesco Exchange Traded FD TS&P500 EQL WGT | S&P500 EQL WGT | $61,414,997 | 5.5% |
| iShares TRCORE MSCI EAFE | CORE MSCI EAFE | $61,304,445 | 5.5% |
| SPDR Series TrustST STR DOW REIT | ST STR DOW REIT | $51,204,217 | 4.6% |
| Schwab Strategic TRUS REIT ETF | US REIT ETF | $51,175,203 | 4.6% |
| American Centy ETF TRUS LARGE CAP VLU | US LARGE CAP VLU | $43,308,332 | 3.9% |
| iShares TRMSCI INTL QUALTY | MSCI INTL QUALTY | $39,276,600 | 3.5% |
| J P Morgan Exchange Traded FULTRA SHRT ETF | ULTRA SHRT ETF | $25,017,788 | 2.3% |
| Dimensional ETF TrustINTERNATNAL VAL | INTERNATNAL VAL | $22,379,676 | 2.0% |
| Abrdn ETFSBBRG ALL COMD K1 | BBRG ALL COMD K1 | $12,074,658 | 1.1% |
| iShares Inc.CORE MSCI EMKT | CORE MSCI EMKT | $5,639,747 | 0.5% |
- Class
- CORE US AGGBD ET
- Share
- 27.2%
- Class
- CORE S&P500 ETF
- Share
- 13.9%
- Class
- ST LON TREAS ETF
- Share
- 9.5%
- Class
- ST STR P400MID
- Share
- 8.6%
- Class
- ST STR SP600 SML
- Share
- 7.2%
- Class
- S&P500 EQL WGT
- Share
- 5.5%
- Class
- CORE MSCI EAFE
- Share
- 5.5%
- Class
- ST STR DOW REIT
- Share
- 4.6%
- Class
- US REIT ETF
- Share
- 4.6%
- Class
- US LARGE CAP VLU
- Share
- 3.9%
- Class
- MSCI INTL QUALTY
- Share
- 3.5%
- Class
- ULTRA SHRT ETF
- Share
- 2.3%
- Class
- INTERNATNAL VAL
- Share
- 2.0%
- Class
- BBRG ALL COMD K1
- Share
- 1.1%
- Class
- CORE MSCI EMKT
- Share
- 0.5%
The share class is shown on a wider screen.
The 15 largest of 15 positions by value, with holdings of the same security combined. Share counts and quarter-on-quarter changes for each position are on EDGAR. View the full information table on EDGAR
This filing
- Form
- 13F-HR
- CIK
- 1167711
- File number
- 028-10206
- Options
- 0 call, 0 put
- In the 25 largest
- 100.0%
- Prior quarter
- $1,023,197,016 at 31 March 2026
- Positions opened
- 1
- Positions closed
- 1
Common questions
What are Mason Street Advisors’ 13F holdings worth?
$1,109,891,435 across 15 positions for the quarter ended 30 June 2026.
What is Mason Street Advisors’ largest 13F holding?
ISHARES TR (CORE US AGGBD ET) was the largest position at $301,971,153, or 27.2% of reported 13F value, as of 30 June 2026.
How concentrated is Mason Street Advisors’ 13F portfolio?
The ten largest positions accounted for 90.6% of reported value and the twenty-five largest for 100.0%, across 15 positions as of 30 June 2026.
Does Form 13F show everything Mason Street Advisors manages?
No. Form 13F covers only long positions in exchange-traded securities over which the manager has investment discretion, valued at quarter end. It excludes cash, most bonds, private funds, and any assets the firm does not have discretion over, so it is neither the firm's total assets nor any individual client's portfolio.
How often does Mason Street Advisors file its 13F?
Every quarter. Managers file within 45 days of each quarter's end, so the figures are a snapshot that changes between filings. This page shows the quarter ended 30 June 2026.
Answered from this filing and the prior quarter's.