MASON STREET ADVISORS, LLC

Registered adviser

CIK

1167711

Location

MILWAUKEE, WI

Portfolio Value

Mid $1,109,891,430

Diversification

Highly concentrated

Files via

abrdn Investments Ltd ALLSPRING GLOBAL INVESTMENTS, LLC AMERICAN CENTURY INVESTMENT MANAGEMENT INC BLACKROCK ADVISORS LLC Boston Partners DODGE & COX DRIEHAUS CAPITAL MANAGEMENT LLC EARNEST PARTNERS LLC

+ 16 more

FEDERATED INVESTMENT MANAGEMENT CO FIAM LLC FRANKLIN MUTUAL ADVISERS LLC FRANKLIN RESOURCES INC Invesco Advisers, Inc. J.P. Morgan Investment Management Inc. KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC LOOMIS SAYLES & CO L P MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Neuberger Berman Investment Advisers LLC Northern Trust Investments, Inc PACIFIC INVESTMENT MANAGEMENT CO LLC T. Rowe Price Investment Management, Inc. Vaughan Nelson Investment Management, L.P. WELLINGTON MANAGEMENT GROUP LLP PRICE T ROWE ASSOCIATES INC /MD/

Filing Date

Global Rank

#2,354 / 8,820 ▼ 93

Period ended 4 months ago

Filed Aug 12, 2026 · 3mo

26 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type

Registered adviser

Form ADV roster, Oct 1, 2026

Form ADV adviser

CRD 114085

Roster of Oct 1, 2026

Regulatory AUM

$39,079,170,300

Main clients

Registered funds and BDCs (100% of AUM)

Registered funds advised

30 series (3 index, 0 ETFs)

$31,607,366,176 net assets· N-CEN Dec 31, 2025

LEI

GK4LJB5OE5ID5VYOCY69

Private funds on Schedule D 7.B.(1)

As filed Nov 11, 2024; SEC's bulk Form ADV archive ends with 2024 filings.

No private funds listed.

Form ADV history

Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.

Rosters	Regulatory AUM	Main clients
Apr 2026 to Oct 2026	$39,079,170,300	Registered funds and BDCs (100%)
Apr 2025 to Mar 2026	$35,039,451,532	Registered funds and BDCs (100%)
Apr 2024 to Mar 2025	$28,558,864,166	Registered funds and BDCs (100%)
May 2023 to Mar 2024	$25,569,711,808	Registered funds and BDCs (100%)
Apr 2023	$25,569,711,808	Registered funds and BDCs (100%)
Apr 2022 to Mar 2023	$31,583,485,945	Registered funds and BDCs (100%)

3 earlier changes not shown.

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, never from the firm's own description.

Style

Concentrated

The top 10 positions are 100.0% of the book (60%+)

Turnover

Medium turnover

31.9% over the last four quarters (30% to under 100%)

Horizon

Long horizon

Value-weighted holding period 15.4 quarters (12+), a floor since 27.2% of the book was already held when coverage starts

Closest benchmark: every 13F filer's combined book, active share 93.9%; sector active share 87.1% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

View clone backtest

Portfolio Concentration

15 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

50.7%

−6.3 pts

Top 5

90.7%

−3.9 pts

Top 10

100.0%

0.0 pts

HHI

3,216

Highly concentrated−646

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Unclassified	100.0%	$1,109,891,430	15

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

11 positions

Ticker	Company	Δ Shares	Shares	Value
SCHH	Schwab U.S. REIT ETF	+514,990	2,161,115	$51,175,203
BCI	abrdn Bloomberg All Commodity Strategy K-1 Free ETF	+184,160	540,495	$12,074,658
RWR	State Street(R) SPDR(R) Dow Jones(R) REIT ETF	+104,580	453,255	$51,204,217
—		+52,825	1,379,248	$79,541,232
IEMG	iShares Trust	+24,560	68,080	$5,639,747
IQLT	iShares MSCI Intl Quality Factor ETF	+23,736	792,666	$39,276,600
RSP	Victory Portfolios II	+20,825	288,645	$61,414,996
DFIV	Dimensional International Value ETF	+10,970	414,285	$22,379,675
JPST	JPMorgan Ultra-Short Income ETF	+8,380	494,716	$25,017,788
SPTL	State Street(R) SPDR(R) Portfolio Long Term Treasury ETF	+7,240	4,005,960	$105,076,330
AGG	iShares Core U.S. Aggregate Bond ETF	+1,567	3,050,830	$301,971,153
No positions match the current search.

Trimmed

Positions the filer reduced

3 positions

Ticker	Company	Δ Shares	Shares	Value
SPMD	State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF	−142,897	1,419,072	$95,872,504
IEFA	iShares Core MSCI EAFE ETF	−76,244	634,753	$61,304,444
IVV	iShares Core S&P 500 ETF	−5,196	206,485	$154,634,551
No positions match the current search.

New Positions

Positions the filer opened this quarter

1 positions

Ticker	Company	Shares	Value	Open
AVLV	Avantis U.S. Large Cap Value ETF	474,820	$43,308,332
No positions match the current search.

Sold Out

Positions the filer fully exited

1 positions

Ticker	Company	Shares	Value	Open
VLUE	iShares MSCI USA Value Factor ETF	288,200	$40,979,158
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

15 tracked positions · $1,109,891,430 total · filing declares 15 positions · $1,109,891,435 · as of Jun 30, 2026

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	Held (qtrs)	Est. cost/share	% of Portfolio
AGG	iShares Core U.S. Aggregate Bond ETF	Added	3,050,830	+1,567	$301,971,153	−0.2%	26+	before history	27.21%
IVV	iShares Core S&P 500 ETF	Reduced	206,485	-5,196	$154,634,551	+11.8%	21	unpriced	13.93%
SPTL	State Street(R) SPDR(R) Portfolio Long Term Treasury ETF	Added	4,005,960	+7,240	$105,076,330	−0.1%	9	$26.94	9.47%
SPMD	State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF	Reduced	1,419,072	-142,897	$95,872,504	+3.6%	9	$54.73	8.64%
		Added	1,379,248	+52,825	$79,541,232	+24.1%	10	$43.19	7.17%
RSP	Victory Portfolios II	Added	288,645	+20,825	$61,414,996	+19.5%	6	$185.36	5.53%
IEFA	iShares Core MSCI EAFE ETF	Reduced	634,753	-76,244	$61,304,444	−4.8%	18	unpriced	5.52%
RWR	State Street(R) SPDR(R) Dow Jones(R) REIT ETF	Added	453,255	+104,580	$51,204,217	+45.4%	9	$95.80	4.61%
SCHH	Schwab U.S. REIT ETF	Added	2,161,115	+514,990	$51,175,203	+44.7%	9	unpriced	4.61%
AVLV	Avantis U.S. Large Cap Value ETF	NEW	474,820	NEW	$43,308,332	NEW	1	$87.83	3.90%
IQLT	iShares MSCI Intl Quality Factor ETF	Added	792,666	+23,736	$39,276,600	+10.5%	5	unpriced	3.54%
JPST	JPMorgan Ultra-Short Income ETF	Added	494,716	+8,380	$25,017,788	+1.6%	23	unpriced	2.25%
DFIV	Dimensional International Value ETF	Added	414,285	+10,970	$22,379,675	+5.1%	5	$41.65	2.02%
BCI	abrdn Bloomberg All Commodity Strategy K-1 Free ETF	Added	540,495	+184,160	$12,074,658	+39.5%	9	$21.94	1.09%
IEMG	iShares Trust	Added	68,080	+24,560	$5,639,747	—	2	unpriced	0.51%

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.