Top Institutional Investors

MASON STREET ADVISORS, LLC — 13F Holdings & Portfolio

CIK 1167711 · latest 13F-HR filed 2026-08-12

Backtest portfolio

MASON STREET ADVISORS, LLC manages $1.11B in 13F-reported U.S. long-equity assets across 15 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are AGG (27.21%), IVV (13.93%), SPTL (9.47%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 1 new position, exited 1, added to 9, and trimmed 0.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Filer Information
Address
720 EAST WISCONSIN AVE
MILWAUKEE, WI 53202
Phone
(414) 665-5400
Filing Manager
MASON STREET ADVISORS, LLC
MILWAUKEE, WI
Signatory
Andrew Heistad
Vice President-Treasurer
Loading holdings…
AUM

$1.11B

Long-equity book

Holdings

15

Distinct positions

Period

2026-06-30

Filed 2026-08-12

Q/Q Activity

+1 / −1 / ↑9 / ↓0

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • ISHARES TR$16.4M +11.8%
  • SPDR SERIES TRUST$16.0M +45.4%
  • SCHWAB STRATEGIC TR$15.8M +44.7%
  • SPDR SERIES TRUST$15.4M +24.1%
  • INVESCO EXCHANGE TRADED FD T$10.0M +19.5%
Show all 9 →

Top Trims

  • No decreased positions.
Show all 0 →

New Positions

  • AMERICAN CENTY ETF TR$43.3M
Show all 1 →

Exited Positions

  • ISHARES TR$41.0M
Show all 1 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 ISHARES TR AGG 464287226 $302.0M 27.21% 3,050,830 SH
2 ISHARES TR IVV 464287200 $154.6M 13.93% 206,485 SH
3 SPDR SERIES TRUST SPTL 78464A664 $105.1M 9.47% 4,005,960 SH
4 SPDR SERIES TRUST SPMD 78464A847 $95.9M 8.64% 1,419,072 SH
5 SPDR SERIES TRUST SPSM 78468R853 $79.5M 7.17% 1,379,248 SH
6 INVESCO EXCHANGE TRADED FD T RSP 46137V357 $61.4M 5.53% 288,645 SH
7 ISHARES TR IEFA 46432F842 $61.3M 5.52% 634,753 SH
8 SPDR SERIES TRUST RWR 78464A607 $51.2M 4.61% 453,255 SH
9 SCHWAB STRATEGIC TR SCHH 808524847 $51.2M 4.61% 2,161,115 SH
10 AMERICAN CENTY ETF TR AVLV 025072349 $43.3M 3.90% 474,820 SH
11 ISHARES TR IQLT 46434V456 $39.3M 3.54% 792,666 SH
12 J P MORGAN EXCHANGE TRADED F JPST 46641Q837 $25.0M 2.25% 494,716 SH
13 DIMENSIONAL ETF TRUST DFIV 25434V807 $22.4M 2.02% 414,285 SH
14 ABRDN ETFS BCI 003261104 $12.1M 1.09% 540,495 SH
15 ISHARES INC IEMG 46434G103 $5.6M 0.51% 68,080 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-12 $1.11B 15 0001167711-26-000005
2026-03-31 2026-05-07 $1.02B 15 0001167711-26-000004
2025-12-31 2026-02-04 $1.02B 15 0001167711-26-000001