MASON STREET ADVISORS, LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Reported portfolio value by quarter (53 quarters reported)

$14.3B $111M

Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q2 26

$9.09B in Q2 2013 → $1.11B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding	% of portfolio	Activity	Shares	Value
IT Ishares Tr	27.2%	Added 0.1%	3,050,830	$302M
IT Ishares Tr	13.9%	Trimmed 2.5%	206,485	$155M
SS SPDR Series Trust	9.5%	Added 0.2%	4,005,960	$105M
SS SPDR Series Trust	8.6%	Trimmed 9.1%	1,419,072	$95.9M
SS SPDR Series Trust	7.2%	Added 4.0%	1,379,248	$79.5M
IE Invesco Exchange Traded Fd T	5.5%	Added 7.8%	288,645	$61.4M
IT Ishares Tr	5.5%	Trimmed 11%	634,753	$61.3M
SS SPDR Series Trust	4.6%	Added 30%	453,255	$51.2M
SS Schwab Strategic Tr	4.6%	Added 31%	2,161,115	$51.2M
AC American Centy ETF Tr	3.9%	New	474,820	$43.3M
IT Ishares Tr	3.5%	Added 3.1%	792,666	$39.3M
JP J P Morgan Exchange Traded F	2.3%	Added 1.7%	494,716	$25M
DE Dimensional ETF Trust	2.0%	Added 2.7%	414,285	$22.4M
AE Abrdn Etfs	1.1%	Added 52%	540,495	$12.1M
I Ishares Inc	0.5%	Added 56%	68,080	$5.64M

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

quarter ended June 30, 2026 · filed August 12, 2026

Company	Action	Shares changed	Value of change	% of portfolio
AC American Centy ETF Tr	New	+474,820	+$43.3M	3.9%
IT Ishares Tr	Exited	−288,200	−$41M	—
SS Schwab Strategic Tr	Added	+514,990	+$12.2M	4.6%
SS SPDR Series Trust	Added	+104,580	+$11.8M	4.6%
SS SPDR Series Trust	Trimmed	−142,897	−$9.65M	8.6%
IT Ishares Tr	Trimmed	−76,244	−$7.36M	5.5%
IE Invesco Exchange Traded Fd T	Added	+20,825	+$4.43M	5.5%
AE Abrdn Etfs	Added	+184,160	+$4.11M	1.1%
IT Ishares Tr	Trimmed	−5,196	−$3.89M	13.9%
SS SPDR Series Trust	Added	+52,825	+$3.05M	7.2%

Showing the 10 largest of 16 changes.

quarter ended March 31, 2026 · filed May 07, 2026

Company	Action	Shares changed	Value of change	% of portfolio
IT Ishares Tr	Added	+705,297	+$63.9M	6.3%
IT Ishares Tr	Exited	−639,005	−$57.2M	—
IT Ishares Tr	New	+288,200	+$41M	4.0%
IT Ishares Tr	Exited	−289,860	−$39.6M	—
IT Ishares Tr	Trimmed	−57,967	−$5.75M	29.6%
I Ishares Inc	New	+43,520	+$3.04M	0.3%
SS SPDR Series Trust	Trimmed	−17,880	−$1.81M	3.4%
IE Invesco Exchange Traded Fd T	Added	+8,390	+$1.61M	5.0%
SS SPDR Series Trust	Added	+32,543	+$1.57M	6.3%
SS SPDR Series Trust	Trimmed	−25,421	−$1.51M	9.0%

Showing the 10 largest of 17 changes.

quarter ended December 31, 2025 · filed February 04, 2026

Company	Action	Shares changed	Value of change	% of portfolio
IT Ishares Tr	New	+639,005	+$57.2M	5.6%
IT Ishares Tr	Trimmed	−626,055	−$42.1M	—
IT Ishares Tr	Exited	−320,000	−$40M	—
IT Ishares Tr	New	+289,860	+$39.6M	3.9%
IE Invesco Exchange Traded Fd T	Added	+106,820	+$20.5M	4.9%
SS SPDR Series Trust	Added	+225,190	+$13M	9.0%
IT Ishares Tr	Added	+67,900	+$6.78M	30.5%
SS SPDR Series Trust	Added	+130,180	+$6.1M	6.0%
DE Dimensional ETF Trust	Trimmed	−49,750	−$2.48M	1.9%
SS Schwab Strategic Tr	Added	+85,915	+$1.79M	3.5%

Showing the 10 largest of 17 changes.

quarter ended September 30, 2025 · filed October 31, 2025

Company	Action	Shares changed	Value of change	% of portfolio
IT Ishares Tr	Trimmed	−60,280	−$40.3M	14.5%
IT Ishares Tr	New	+320,000	+$40M	4.1%
SS SPDR Series Trust	Added	+434,600	+$24.9M	8.1%
IT Ishares Tr	Added	+246,936	+$24.8M	31.6%
JP J P Morgan Exchange Traded F	Added	+251,920	+$12.8M	2.5%
IT Ishares Tr	Exited	−98,600	−$6.12M	—
IT Ishares Tr	Added	+59,855	+$5.23M	5.7%
IT Ishares Tr	Exited	−42,600	−$4.66M	—
IE Invesco Exchange Traded Fd T	Added	+19,510	+$3.7M	3.0%
SS SPDR Series Trust	Added	+35,305	+$3.54M	3.7%

Showing the 10 largest of 17 changes.

quarter ended June 30, 2025 · filed August 08, 2025

Company	Action	Shares changed	Value of change	% of portfolio
IT Ishares Tr	New	+692,700	+$29.9M	3.5%
IT Ishares Tr	Trimmed	−327,900	−$27.4M	5.6%
IT Ishares Tr	Added	+247,294	+$24.5M	32.4%
DE Dimensional ETF Trust	New	+414,700	+$17.8M	2.1%
IT Ishares Tr	Trimmed	−21,600	−$13.4M	19.6%
SS SPDR Series Trust	Added	+235,300	+$10M	5.4%
SS SPDR Series Trust	Added	+181,800	+$4.83M	12.1%
IT Ishares Tr	Trimmed	−70,200	−$4.35M	0.7%
IT Ishares Tr	Trimmed	−9,000	−$984K	0.5%

quarter ended March 31, 2025 · filed May 14, 2025

Company	Action	Shares changed	Value of change	% of portfolio
IE Invesco Exchange Traded Fd T	New	+133,100	+$23.1M	2.9%
IT Ishares Tr	Trimmed	−133,900	−$10.1M	8.7%
SS SPDR Ser Tr	Added	+116,100	+$5.94M	6.0%
IT Ishares Tr	Trimmed	−79,600	−$4.64M	1.3%
IT Ishares Tr	Trimmed	−30,700	−$3.04M	32.0%
IT Ishares Tr	Added	+3,800	+$2.14M	20.8%
SS SPDR Ser Tr	Trimmed	−6,900	−$188K	12.8%

quarter ended December 31, 2024 · filed February 10, 2025

Company	Action	Shares changed	Value of change	% of portfolio
AE Abrdn Etfs	Trimmed	−724,700	−$14.3M	0.8%
IT Ishares Tr	Trimmed	−82,100	−$9.46M	0.8%
IT Ishares Tr	Trimmed	−15,500	−$9.12M	21.9%
IT Ishares Tr	Added	+113,300	+$7.96M	9.4%
IT Ishares Tr	Trimmed	−87,100	−$5.43M	2.0%
IT Ishares Tr	Added	+54,200	+$5.25M	32.3%
SS SPDR Ser Tr	Added	+112,800	+$5.07M	5.0%
SS SPDR Ser Tr	Added	+90,600	+$4.95M	5.7%
SS SPDR Ser Tr	Trimmed	−17,000	−$1.68M	4.1%
SS Schwab Strategic Tr	Trimmed	−69,500	−$1.46M	4.1%

quarter ended September 30, 2024 · filed November 12, 2024

Company	Action	Shares changed	Value of change	% of portfolio
SS SPDR Ser Tr	Added	+648,800	+$35.5M	4.8%
IT Ishares Tr	Trimmed	−59,500	−$6.96M	1.9%
IT Ishares Tr	Added	+87,400	+$6.82M	8.7%
IT Ishares Tr	Added	+67,300	+$6.82M	31.0%
IT Ishares Tr	Trimmed	−8,600	−$4.96M	21.2%
SS Schwab Strategic Tr	Trimmed	−173,800	−$4.03M	4.4%
SS SPDR Ser Tr	Trimmed	−33,400	−$3.56M	4.4%
SS SPDR Ser Tr	Added	+65,400	+$2.98M	4.1%

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